Which breed of high-yield laying hens is good for cooperation recently?

At present, the laying hens on the market are: white shell laying hens, brown shell laying hens, pink shell laying hens and green shell laying hens. The following is the introduction of each variety.

(1) White-shell layer

It is mainly bred on the basis of sailing varieties and is a typical representative of laying hens. At present, the number of white-shell laying hens at home and abroad is the largest and the distribution area is the widest. Because this kind of chicken lays eggs early and has high egg production; Do not nest; Small size, less materials, high reward for laying feed; The feeding density per unit area is high, relatively speaking, the total number of eggs per unit area is more; Strong adaptability, can be raised in various climatic conditions; The ratio of blood spots to meat spots in eggs is very low. This kind of chicken is most suitable for intensive cage management. Its disadvantages are small egg weight, nervousness, timidity and poor pressure resistance; Active and flying, it is necessary to set up a high fence under the condition of flat ground maintenance; There are many pecking habits, especially the high casualty rate caused by pecking anus in the early stage of delivery. The price of white-shell eggs in China is slightly lower than that of brown-shell eggs. In the case of brown-shell eggs, white-shell eggs are not very popular.

(1) Bai Jing 904 Bai Jing 904 is a three-line package. It is a hybrid chicken with the best egg laying performance in Beijing White Chicken series selected by Beijing Breeding Company. The father is a single line and the mother is a double line. The outstanding characteristics of this hybrid chicken are early maturity, high yield, large eggs, strong vitality and high feed reward. In the "Seventh Five-Year Plan" national random sampling test on the production performance of laying hens, Bai Jing 904 ranks among the best in laying eggs, even surpassing the production performance of imported babcock B-300, and it is the best chicken breed in China at present. The determination results are as follows:

The fertility rate of 0-20 weeks is 92.17%; The weight at 20 weeks old is 1.49 kg; The population began to lay eggs at the age of 150 days (the laying rate reached 50%), and 288.5 eggs were laid at the age of 72 weeks, with an average egg weight of 59.0 1g and a total egg weight of 17.02kg: 2.33 kg per kilogram of eggs. The survival rate in laying period was 88.6%; At the end of laying, the weight is 2 kg. Therefore, Bai Jing 904 is most suitable for feeding in closed henhouses, but its egg-laying performance is a little poor in open henhouses.

(2) Bai Jing 823 Bai Jing 823 is a two-line hybrid chicken bred by Beijing Breeding Company from 1975 with the full cooperation of breeding experts from scientific research institutions. This is the achievement of laying hen breeding in China in the sixth five-year plan. Before the advent of Bai Jing 904, Bai Jing 823 was an excellent breed of laying hens with the largest feeding quantity and the widest distribution in China, which made outstanding contributions to the development of laying hens industry in China. The main random sampling results of its production performance are as follows:

The mating rate of 0-20 weeks old is 96%; The weight at 20 weeks old is 1.54 kg; 156-day-old lays 50% eggs, and 72-week-old lays 255.6 eggs, with an average egg weight of 58.4g. The total egg weight14.93kg: 2.57kg for each kilogram of eggs. The weight at the end of egg laying is 65438 0.98 kg; The survival rate in laying period was 89.2%. In the pilot test of 5000 chickens, 263.3 eggs were laid at 72 weeks old, with an average egg weight of 58.2 grams and a total egg weight of 15.3 kg. The feed consumption per kilogram of eggs is 2.6 kilograms, and the survival rate during laying period is 89.3%.

(3) Bai Jing 938 is a technician of Beijing Poultry Company. In order to realize the self-nature of white-shell layers and reduce the adverse effects and costs caused by inverted anus identification of male and female, based on the original pure lines of Bai Jing 823 and 904, rapid feathering and full feathering breeding were carried out. From 199 1- 1995, through the determination of several batches and dozens of combinations, 938 high-yield white-shell laying hens with self-pollination in feather speed and strain matching were finally screened out. The main production performance indicators are as follows: the mating rate at 20 weeks old is 94.4%; The weight at 20 weeks old is 1. 19 kg; 303 eggs were laid in 2 1-72 weeks, with an average egg weight of 59.4g and a total egg weight of18 kg; The survival rate in laying period is 90-93%. At present, it has become the company's key chicken breed, gradually replacing Bai Jing 823 and Bai Jing 904.

(4) Bai Bin 42 Bai Bin 42 is a two-line hybrid chicken bred with imported materials from Northeast Agricultural College. It is a high-yield laying hen with the best laying performance, the largest number of popularization and the widest distribution in Bai Bin chicken series. In the "Sixth Five-Year Plan" national key laying hens production performance spot check, the random spot check results are as follows:

The mating rate of 0-20 weeks old is 96.9%; The weight at 20 weeks old is 1.49 kg; The laying rate of 160 days old reached 50%; At 72 weeks old, 257.2 eggs were laid, with an average egg weight of 58 grams, a total egg weight of 14.92 kg, and a consumption of 2.72 kg per kg of eggs. The weight at the end of egg laying is 65438 0.96 kg; The survival rate in laying period was 85.3%. 5 184 chicken pilot test results: 72-week-old hens laid 242.7 eggs, with an average egg weight of 58.2 grams, a total egg weight of 14. 13 kg, and an egg consumption of 2.69 kg per kg; The survival rate in laying period was 88.3%. Bai Bin 42 is suitable for the cold climate in Northeast China, and it is also distributed in the customs, but the number is small.

(5) Starting from 1986, 584 experts from Northeast Agricultural University of Bai Bin introduced Hesse White parents as breeding materials, and hybridized with the original pure lines of Bai Bin chicken. After 6 years' work, 1992 screened out Bai Bin 584 high-yield laying hens. The main production performance indicators are as follows: 72-week-old feeding lays 28 eggs per day1.1egg, with an average egg weight of 59.86g, total egg weight 16.83kg, egg feed ratio 1: 2.53 and survival rate of 91./kloc-. At present, Bai Bin 584 has replaced Bai Bin 42 and been widely promoted in production, mainly distributed in Heilongjiang Province. Breeding chickens are raised in Harbin original seed farm. & ltBR & gt

(6) Xingza 288 This hybrid chicken was bred by Cheval Company of Canada. Xingzha 288 used to be a three-line bag, but now it is a four-line bag. This breed used to be a world-famous white-shell laying hen, which was raised in more than 90 countries and regions around the world. The genetic potential of this breed is 300 eggs. Cheval Company guarantees that the number of eggs laid by chickens entering the house is 260-285, the weight at 20 weeks old is 1.25- 1.35 kg, and the weight at the end of laying is 1.75- 1.95 kg, 0-. According to the determination of Belgium, France, Germany, Sweden and Britain, the average data is: 270.6 eggs are laid at 72 weeks old, with an average egg weight of 60.4 grams, 2.5 kilograms of substances are consumed per kilogram of eggs, and the survival rate during the laying period is 92%. Xingza 288 hybrid chicken provided materials for the breeding of Beijing white chicken. At present, Xingza 288 great-grandfather hen has been introduced to a breeding farm in Harbin, China for breeding. Xingzha 288, which was originally introduced, can't be self-conscious. In recent years, Shandong Province introduced a new type of self-bred Xingza 288 ancestral chicken in Chiping County breeder farm. According to the advertising materials, the laying rate of commercial chickens 156 days old is 50%, and the laying rate of more than 80% can last for 30 weeks. The number of eggs laid in the shed is 270-290, the average egg weight is 63g, the egg-feed ratio is 1: 2.2-2.4, and the adult chicken weight is 1.67-6544.

(7) Hesse White Chicken is a four-line hybrid chicken selected by Holland Youli Hybrid Chicken Company. Known for its high egg laying intensity and egg weight, it is considered to be one of the highest-yielding white-shell laying hens in contemporary times. Its genetic potential for laying eggs is less than 00, and the company guarantees 279. Chicken breeds lay eggs at the age of 135- 140, the laying rate at the age of 160 is 50%, the laying peak at the age of 2 10-220 is over 90%, and the total egg weight is16-/kloc-0. According to the determination of Britain, Sweden, Germany, Belgium, Austria and other countries, the average data are as follows: the egg production at 72 weeks old is 274. 1, the average egg weight is 60.4g, and the survival rate during laying period is 92.5%. 1984, the total egg weight of two 72-week-old Heiske white chickens raised in Beijing Sino-Japanese Friendship Chicken Farm reached 16 kg and13 kg respectively, setting a new record for the production level of laying hens in China.

(8) babcock B-300 This chicken is a four-line hybrid chicken bred by American babcock Company. More than 70 countries and regions in the world, the distribution range is second only to Xingza 288. Babcock Company has been merged by Issa Company, and the chicken is now called "Isaba Boocock B-300". The chicken is characterized by high egg production, moderate egg weight and high feed reward. According to company data, the mating rate of commercial chickens aged 0-20 weeks is 97%, and the survival rate during laying period is 90-94%. 72-week-old laid 275 eggs, laying 283 eggs every day, with an average egg weight of 665,438 0 grams, a total egg weight of 65,438 06.79 kilograms, and an egg consumption of 2.5-2.6 kilograms per kilogram. Babcock B-300 participated in the seventh five-year plan for laying hens. The results of random sampling are as follows: the mating rate of 0-20 weeks old is 88.7%; The weight at 20 weeks old is1.46 kg; 285 eggs were laid at the age of 72 weeks, with an average egg weight of 58.96g, a total egg weight of16.8kg, and a consumption of 2.29kg per kilogram of eggs, and a final egg weight of10.96kg.. The survival rate in laying period is 85. 1%, which fully shows the high-yield performance of babcock B-300. The great-grandparent chicken "Sha Yi babcock B-300" from French Sha Yi Company was introduced to the original breeding farm of Beijing Poultry Company on 1987, which is the only breeding base of babcock B-300 great-grandparent chicken in China.

(9) Nick White Chicken Nick White Chicken is a three-line hybrid chicken bred in Pfizer, USA. Zudai chicken was introduced to Huangpi Chicken Farm in Guangzhou on 1979. At present, it is still raised in some places, mainly as breeding materials. Beijing white chicken ⅷ line was bred from Nick white chicken. According to the average data of poultry inspection stations in Britain and Sweden, there are 272 eggs of 7 1 week, with an average egg weight of 60. 1 g and a consumption of 2.5 kg per kilogram of eggs. The weight at the end of laying is 1.8 1 kg; The survival rate in laying period was 92.54%. At present, Shenyang Sitaizi Nick White Breeding Chicken Co., Ltd. raises Nick Zudai chickens.

(10) Romance White is a two-line hybrid chicken selected by German Romance Company, that is, the selected Romance SLS. Because of its high egg production and heavy eggs, it is favored by people. According to the information of Roman company, the mating rate of Roman white commercial chicken substitute is 96-98% from 0 to 20 weeks old; The weight at 20 weeks old is 1.3- 1.35 kg; 150- 155-day-old laying rate is 50%, peak laying rate is 92-94%, 72-week-old laying number is 290-300, the average egg weight is 62-63g, the total egg weight is 18- 19kg, and the material consumption per kilogram of eggs is 2. The weight at the end of laying is1.75-1.85kg; The survival rate in laying period is 94-96%. At present, Hualuo Poultry Breeding Co., Ltd. has introduced the parents of Roman White Chicken.

(1 1) Highland W-36 This chicken is a hybrid chicken bred by Highland International. According to company data, Blue Ocean W-36 commercial chicken substitute: 0- 18 weeks old, with a mating rate of 97% and an average weight of 1.28 kg; 16 1 day, the laying rate reached 50%, the peak laying rate was 9 1-94%, the average egg weight at 32 weeks was 56.7 grams, the average egg weight at 70 weeks was 64.8 grams, and the number of eggs laid by 80-week hens was 294-3 15, which was the number of eggs laid on a feeding day. The survival rate in laying period is 90-94%. Blue Ocean W-36 chicks can identify themselves by feather speed. At present, Hailan W-36 ancestral chicken is imported from Shandong Air Force Feicheng Chicken Farm, Liaoning Agricultural Reclamation Huishan Ancestral Chicken Farm and Shanxi Taiyuan Shenzhou Experimental Chicken Farm.

(12) Dika Bai Dika Bai is a hybrid chicken bred by Dika Bu Company of America. According to the sampling data of Germany 1988- 1989, 299.5 eggs were laid at the age of 500 days, the average egg weight was 6 1. 1g, the total egg weight was 18.26kg, and the consumption per kilogram of eggs was 2.4kg. The survival rate in laying period was 97.9%. At present, Dika Baizu chicken has been introduced to the ancestral breeding farm in Jining City, Shandong Province.

(2) Due to the progress of breeding, brown-shell laying hens have developed from meat and eggs to eggs, which has a growing trend in the world in recent years. On the one hand, consumers like brown-shelled eggs, on the other hand, egg production has been greatly improved. Brown-shell laying hens also have the following advantages: egg weight, which is heavier than white-shell eggs in the early stage of laying; Eggs have low breakage rate and are suitable for transportation and storage; Chickens are docile, insensitive to stress factors and easy to manage; Commercial cocks with larger weight, higher meat production and faster growth are the supplementary sources of muscle; Good cold tolerance and stable egg laying rate in winter; Pecking addiction is less, so the death and elimination rate is lower; Hybrid chickens can carry out self-sex identification. However, brown-shell layers are heavier, and their feed intake is 5-6g/ day more than that of white chickens. Each chicken occupies about 65,438+05% more area than the white chicken, and lays 5-7% less eggs per unit area. This kind of chicken is easy to be overweight, and the feeding technology is more difficult than that of white chicken, especially it must be restricted, otherwise overweight will affect the laying performance; Large size, poor heat resistance; Eggs have a high rate of blood spots and meat spots, and their senses are not very good.

(1) Sha Yi Brown is a four-line hybrid chicken bred by French Sha Yi Company. It is one of the best high-yield brown shell laying hens in the world at present. According to the data of Sha Yi Company, the mating rate of commercial chicks aged 0-20 weeks is 97-98%; The weight at 20 weeks is1.6 kg; The egg laying rate reached 50% at 23 weeks, and the peak egg laying rate reached 93% at 25 weeks. At the age of 76 weeks, 292 eggs were laid in the shed, and 302 eggs were laid every day, with an average egg weight of 62.5g, a total egg weight of18.2kg and a consumption of 2.4-2.5kg per kg. At the end of laying, the hen weighs 2.25 kilograms; The survival rate was 93%. According to the test results of 1986- 1987 on 5000 Chinese-French Isabrown chickens, the mating rate of 0- 18 weeks was 99%; 72-week-old hens laid 284.9 eggs; The average egg weight is 60.4, the total egg weight is 17.3 kg, and the material consumption per kg egg is 2.73 kg. The survival rate in laying period was 865438 0.23%. It has set a record for laying eggs of imported chickens in China. Therefore, in recent years, the number of Isabrown raised in China has increased dramatically. At present, China Breeding Company, Dalian Breeding Farm and Hangzhou Jinjiang Breeding Farm have all introduced Isabrown grandparent chickens, among which Hualian Grandparent Chicken Farm of Animal Husbandry Industry Corporation is the largest.

(2) Hesse Brown This chicken is a four-line hybrid chicken bred by Yulibrede Company in the Netherlands. This chicken is also widely distributed in the world, and it is one of the best brown-shell laying hens in the world at present. The bus bars are all reddish brown and the bus bars are all white. Commercial chicks can be distinguished by feather color: male chicks are white and female chicks are brown. According to the company, the genetic potential of Hesse Brown is 295 eggs per year, and the company guarantees the laying level of 275 eggs. The mating rate of commercial substitute chickens from 0 to 20 weeks old is 97%; The weight at 20 weeks is 65438±0.63kg；; 302 eggs were laid at the age of 78 weeks, with an average egg weight of 63.6 grams and a total egg weight of 19.2 kg. The survival rate in laying period is 95%. At present, it is raised all over the country, which generally reflects that this breed of chicken not only has good laying performance, but also has strong adaptability and disease resistance.

(3) Roman Brown Roman Brown is a four-line, brown-shell, high-yield laying hen bred by Roman Company in Germany. The bus bars are all brown and white. The color of feathers can be used to distinguish between males and females: male chicks are white and female chicks are brown. According to the company's data, the mating rate of 0-20 weeks old Roman brown commercial chicken is 97-98%, and the laying rate of 152- 158 days old is 50%. The total consumption of 0-20 weeks old is 7.4-7.8kg, and the weight of 20 weeks old1.5-1.6 kg; During the peak period, the laying rate is 90-93%, the number of eggs laid by 72-week-old hens is 285-295, the average egg weight of 1.2 months old is 63.5-64.5g, and the total egg weight of house-fed hens is/.8-1.8kg, with 2.3-2.4kg of materials per kilogram of eggs. The weight at the end of laying is 2.2-2.4 kg; The survival rate of laying hens in laying period is 94-96%. According to the statistics of European Poultry Inspection Station, there are 280 72-week-old eggs, with an average egg weight of 62.8 grams, a total egg weight of 17.6 kilograms, and a consumption of 2.49 kilograms per kilogram of eggs. The mortality rate during laying period was 4.8%. Roman brown great-grandparent chicken was introduced to Shanghai Huashen great-grandparent chicken farm on 1989, and the ancestral and parental chicken farms are all over the country.

(4) Dika Brown is a four-line hybrid chicken bred by American Dika Bu Company. Both sexes are brown feathers and white feathers. Commercial chicks can identify themselves by feather color: male chicks are white and female chicks are brown. According to the company's information, the commercial substitute hen: 20-week-old weight1.65 kg; The mating rate of 0-20 weeks old is 97-98%; The laying rate of 24-25 weeks old is 50%; The peak laying rate is 90-95%, and the laying rate above 90% can be sustained 12 weeks. At the age of 78 weeks, the egg production is 285-3 10, the egg weight is 63.5-64.5g, the total egg weight is18-19.9kg, and the feed consumption per kg is 2.58. The survival rate in laying period is 90-95%. According to the average data of European poultry inspection stations, there are 273 72-week-old eggs, with an average egg weight of 62.9 grams, a total egg weight of 17.2 kilograms, and a consumption of 2.56 kilograms per kilogram of eggs; The mortality rate during laying period was 5.9%. At present, Shanghai DJI Co., Ltd., a Sino-foreign joint venture, is the largest seed supply base of Dika Brown Zuji in China. Parents are all over the country.

(5) Golden Brown is a set of laying hens cultivated by Decarboard Company of the United States, which is characterized by small size and little difference in appearance from Decarboard Brown. According to the advertising materials, the production performance of golden brown commercial chicken is as follows: the mating rate in breeding period is 96-98%, and the survival rate in laying period is 94-96%. 72-week-old hens lay 290-3 10 eggs, with an average egg weight of 63-64g and a peak egg laying rate of 92-95%. The ratio of egg to feed is 1: 2.07-2.28. The birth weight is 1.45- 1.6 kg, and the adult hen weighs 2.05-2. 15 kg. Golden-brown ancestral chickens were introduced to the ancestral chicken farm in Jining City, Shandong Province.

(6) Ross Brown is a four-line hybrid chicken bred by British Ross Company. The male parent has two rows of brown feathers and the female parent has two rows of white feathers. Commercial chickens can distinguish themselves according to the color of their feathers. According to the data of Ross Company, Ross Brown commercial chicken substitute: 0- 18 weeks 7 kg, 19-76 weeks 45.7 kg; 18-week-old weight1.38kg, 76-week-old weight 2.2kg: during the peak laying period of 25-27 weeks, 72-week-old hens laid 280 eggs and 76-week-old hens laid 298 eggs, with an average egg weight of 61.7g and a consumption of 2.35kg per kilogram of eggs. In the unified determination of laying performance in Beijing, Ross Brown commercial chicken laid 2,765,438 0.4 eggs at 72 weeks old, with an average egg weight of 63.6 grams, a total egg weight of 65,438 07.25 kilograms and an egg consumption of 2.46 kilograms per kilogram. The mating rate of 0-20 weeks old is 99. 1%, and the death elimination rate during laying period is 10.4%. Shanghai Xinyang Breeding Farm introduced rose brown great-grandfather chicken.

(7) Agricultural University Brown Chicken is a four-line hybrid chicken bred by the method of synthetic line breeding based on imported materials from Beijing Agricultural University. It is the result of the seventh five-year plan for laying hens in China. The bus bars are all red, brown and white. It is characterized in that both parents and commercial chicks can distinguish themselves by feather color. Commercial substitute hens have high laying performance, strong adaptability and high feed reward, which is the best supporting line among brown-shell laying hens bred in China at present. ? Quot Data provided by random sampling of laying hens in the Seventh Five-Year Plan: the mating rate of 0-20 weeks old is 96.7%; The weight of 20-week-old chickens is 1.53 kg; The laying rate of 163 days old reached 50%, and 278.2 eggs were laid at 72 weeks old, with an average egg weight of 62.85g, a total egg weight of16.65kg and an egg consumption of 2.3 1 kg. Weight at the end of egg laying is 2.09 kg; The survival rate in laying period was 965438 0.3%. & ltBR & gt

(8) Highland Brown Chicken is a four-line hybrid chicken bred by Highland International Company of the United States. The male parent is reddish brown and the female parent is white. Commercial chicks can identify themselves by feather color: male chicks are white and female chicks are brown. According to the data of Blue Ocean International Company, the breeding rate of Blue Ocean commercial chicken is 97% from 0 to 20 weeks old; 20-week body weight1.54 kg; 156 days old, laying rate is 50%; At 29 weeks, the laying rate was 91-96%; 18-80 weeks, and the daily egg production is 299-318; The average egg weight at 32 weeks is 60. The survival rate of laying hens aged 20-74 weeks is 9 1-95%. According to the observation data of a laying hen farm in Foshan City, Guangdong Province, the survival rate of 0-40 days old is 97-98.5%, and the mating rate of 4 1- 126 days old is 98.5-98.8%. Average weight 1.48- 1.49 kg; 17 1- 175 days old reached 50% egg laying rate. The peak laying period lasted 2 10-2 13 days, and the highest laying rate was 92. 1-94.2%. More than 90% of the eggs are laid for 66-73 days, and the average monthly mortality rate is 0.9%.

(9) Xingza 566 is a four-line hybrid chicken bred by Cheval Company of Canada. The brown-shell layers mentioned above all achieve the purpose of feather color self-identification through the sex inheritance of gold gene and silver gene, while Xingza 566 is based on the principle of no stripes and stripes. According to the company's data, hybrid chickens lay 245-265 eggs at 72 weeks old, with an average egg weight of 64 grams and a total egg weight of 15.7- 17 kg; The consumption of eggs per kilogram is 2.5-2.7 kilograms. The layers with similar feather color to Xingza 566 are Huck and Lanhai Black-bone Chicken. B-6 chicken was bred on the basis of Xingza 566.

(10)B-6 Chicken B-6 Chicken is the only brown-shell hen bred in Kuroha in China. They are two-line hybrid chickens bred by the Institute of Animal Husbandry of China Academy of Agricultural Sciences, and are bred by closed-group family selection with imported materials. The male parent's feather color is reddish brown, and the female parent's chicken is striped rock chicken, commonly known as Lu Hua chicken. Commercial substitute chickens can distinguish themselves by feather color: the cock's down is black with a white bright spot on its head, and the mother's down is also black, but there is no black bright spot on its head. The male chicks grow up with mottled feathers, while the female chicks grow up with black feathers or hemp and black ephedra. Its production performance: the mating rate of 0-20 weeks old is 93.5%; The weight at 20 weeks old is1.68 kg; The laying rate of 155 days old reached 50%, and 274.6 eggs were laid at 72 weeks old, with an average egg weight of 58.28 grams. The total egg weight was 16.0 1 kg, and the consumption per kg was 2.54 kg. The weight at the end of laying is 2.1kg; The survival rate in laying period was 82.7%. This kind of chicken has a large body and a small egg weight. Cocks with colorful feathers grow fast and have good meat quality, which is very popular among farmers.

(3) powder shell laying hens

Powder shell layer is a hybrid chicken produced by orthogonal or reverse hybridization between Luodaohong variety and Bailaihang variety. Its eggshell color is between brown and white, and it is light brown. Strictly speaking, it belongs to brown-shelled eggs, and it has become a custom for people in China to call it pink-shelled eggs. Its feather color is white, with mottled feather spots such as yellow, black and gray, which is different from brown shell laying hens. So it is divided into powder shell laying hens.

(1) Xingza 444 is a three-line hybrid chicken bred by Cheval Company of Canada. According to Cheval's data, it lays 265-280 eggs at the age of 72 weeks, with an average egg weight of 6 1-63 grams and a consumption of 2.45-2.7 kilograms per kilogram of eggs. According to the random sampling results of 1988- 1989 in Germany, its production performance is as follows: 500-day-old hens lay 276-279 eggs, with an average egg weight of 63.2-64.6g and a total egg weight of17.66-17.8kg. The survival rate in laying period is 9 1.3-92.7%.

(2) Nongchang No.2 is a two-line hybrid chicken bred by Beijing Agricultural University, and the male line is a white-brown feather synthetic line. Commercial chicks can be separated from each other by feathers. The results of random sampling determination of main indexes of production performance are as follows: (1) the mating rate of 0-20 weeks old is 90.2%; Starting weight1.49 kg; 16 1 day reached 50% egg laying rate, laying 255 eggs at 72 weeks old.1egg, with an average egg weight of 59.8g, total egg weight 15.25kg, and consumption of 2.07kg per kilogram of eggs. At the end of laying period, the survival rate was 87. The pilot test of 405 1 chicken showed that the egg production at 72 weeks old was 250.9 pieces. The average egg weight is 58.2g, the total egg weight is14.6kg, and the material used is 2.7kg per kg. ..

(3)B-4 chicken is a two-line hybrid chicken bred by Xingza 444 from Animal Husbandry Institute of China Academy of Agricultural Sciences. The paternal line is Luo Daohong, and the maternal line is Bai Laihang. The feather color of hybrid chicken is gray with brown or black feather spots, and its production performance is determined by random sampling: the mating rate of 0-20 weeks old is 93.4%; Starting weight1.78 kg; The laying rate of 165 days old reached 50%, and 254.3 eggs were laid at 72 weeks old, with an average egg weight of 59.6 grams, a total egg weight of 15. 16 kg, and a feed-egg ratio of 2.75: 1. The survival rate at the end of egg laying was 82.9%. According to the pilot test results of 554 1 B-4 chickens, 50% of the eggs were laid at the age of 165, more than 80% of the eggs were laid at the peak of 157, and 72-week-old eggs were 265. 1, with an average egg weight of 59.4g and a total egg weight of/kl. 1995 introduced B-4 hybrid chicken with spontaneous feather speed, which made this breed more prominent.

(4) The new B-4 chicken was bred by the Institute of Animal Husbandry of China Academy of Agricultural Sciences on the basis of the original B-4 chicken for several years. 1993 established a complete set of pure fast-feathering and pure slow-feathering strains, and achieved the goal of self-sex of commercial chickens, including self-sex of feather speed and partial feather color. Yes, this is the outstanding feature of the new B-4 chicken, and the self-sex accuracy rate is 98. According to the determination results, the mating rate of commercial chickens from 0 to 20 weeks old is 96%, and the laying rate of 155 days old reaches 50%. The highest egg laying rate was 96.3% at 25 weeks old, and 276.7 eggs were laid at 72 weeks old, with an average egg laying rate of 76%, an average egg weight of 60.7 grams and a total egg weight of 16. The new B-4 chicken replaced the original B-4 chicken.

(5) Bai Jing 939 is a complete line of powder-shell laying hens selected by researchers of Beijing Poultry Company from 1993- 1994. The male parent is a brown-shell laying hen and the female parent is a white-shell egg graft. Cocoa feather speed of hybrid commercial chicken is self-pollination. The results of production performance measurement showed that the fertilization rate was 95% at 20 weeks old, the survival rate at laying period was 92%, the weight at 20 weeks old 1.5 1kg, the daily egg production at 2 1-72 weeks old was 302, the average egg weight was 62g, and the total egg weight was18.7kg.. At present, Bai Jing 939 has been widely used.

(6) Osek (Yuji Zibie) layer Yuji Zibie is a new breed of chicken selected by Zhangjiakou Higher Agricultural College in cooperation with Qinhuangdao Chicken Farm in Hebei Province, and passed the technical appraisal on June 1993. This chicken breed is divided into concubine 1 which lays white eggs and concubine 2 which lays pink eggs. In recent years, after the establishment of Qinhuangdao Osek Poultry Research Center, it was renamed Osek White and Osek Powder Laying Hens. These two kinds of commercial laying hens can be self-pollinated, with strong adaptability, high laying performance and high feed conversion rate, and have become important laying hens in Hebei Province. According to the inspection report of Qinhuangdao breeder farm 1995, the mating rate of concubine 1 20 is 90.2%, the survival rate of laying period is 90.9%, the laying age is 166 days, the laying weight is 1.43 kg, and the average egg weight at 43 weeks is 57.8 grams. The conception rate of Yuji No.2 at 20 weeks old was 97.2%, the survival rate at laying period was 92.4%, the age 168 days, the birth weight 1.69 kg, the average egg weight at 43 weeks old was 6 1.7 g, the peak egg laying rate was 90.8%, and the total egg weight at day old was/kloc-0.

Four: Green shell laying hens

Green-shell laying hens are named after laying green-shell eggs, which are characterized by green eggs, integrating natural black food and green food, and are rare in the world.

Endemic to China, it is listed as a "national special resource protection project" by the Ministry of Agriculture. This kind of chicken has strong disease resistance, wide adaptability, likes to eat grass and leaves, and its feeding management, epidemic prevention and disease removal are no different from ordinary domestic chickens. Green shell laying hens are small, compact, agile, symmetrical, early in sexual maturity and high in egg production. Adult cocks weigh 3.2-4.5 kg, hens weigh 1.9-3. 1 kg, and lay eggs 160- 180 a year.