CN114391508B - Breeding method of new species of milk sheep - Google Patents
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- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
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Abstract
The invention discloses a breeding method of a new variety of milk sheep, which comprises the steps of carrying out hybridization production by taking a Hu sheep as a female parent and taking an Dongfrui raw sheep as a male parent to obtain a Donghui first-generation sheep flock; then, carrying out progressive hybridization on a ewe in the first-generation Donghu flocks and a Dongfrui ram to obtain second-generation Donghu flocks; and then mating the ewes in the second generation of Donghu sheep flocks with the ewes in the Wawest to obtain Donghu A third generation sheep flocks, and selecting excellent ewes and rams in the Donghu A third generation sheep flocks for transverse crossing fixation, group selection, group breeding and breeding improvement to finally obtain a new variety of the dairy sheep. The new species of the dairy sheep bred by the invention has the advantages of high growth and development speed, strong disease resistance, high milk yield and high protein fat content, the milk yield in one lactation period is more than 320 kg, the protein content is 5.7-6.3%, and the fat content is 6-6.7%. The lamb laying rate of the ewes is over 230 percent, the weight of the adult rams is 60-85 kg, and the weight of the adult ewes is 40-55 kg.
Description
Technical Field
The invention relates to the field of animal breeding, in particular to a breeding method of a new dairy sheep variety.
Background
Milk sheep are one of the earliest animals providing milk nutrition to humans, who have had thousands of years of history using sheep milk as a food. Since the milk production efficiency of the dairy sheep as dairy livestock is inferior to that of dairy cows, the dairy cow industry has been developed, the breeding amount is continuously increased, and the milk becomes the most popular dairy food on the dining table of people. The method forms an objective barrier to the development of the dairy sheep industry, and the breeding progress of the dairy sheep is limited to a certain extent. However, with the further development of social economy and the recognition of people on the nutritive value of the sheep milk in recent years, the sheep milk with high quality and special characteristics and the milk products thereof are gradually favored by people, and the consumption of the sheep milk and the milk products thereof is increased year by year. Especially, the consumption of sheep milk in China is in a rapidly rising situation in recent years, but most of the sheep milk is imported, and the own milk sheep industry is not formed yet.
The protein and fat contents of sheep milk are extremely high, between 5% and 7% and 6% and 8%, respectively, whereas the lactose content is only between 4% and 5%. The yield of the sheep milk for making cheese is high and can reach 18 percent. Meanwhile, the prepared cheese has unique flavor and extremely high nutritional value. Sheep milk is the best cheese making raw milk among cheesemakers. Many of the world's well-known cheese brands, such as Rokford Lan Mei cheese (Roquefort), hard Pearlomanno (Hard Peacorino Romano), soft Pearloosardo (Soft Peacorino sardo) soluble Manchester (filling Manchego), tender Ossau-Iraty (Tender Ossau-Iraty), and Salty Feita (salt Feta), are made from sheep milk. Since the fat content of sheep milk is more than 2 times that of goat and cow's milk, the world-wide sheep butter is essentially produced from sheep milk. The total production of sheep cheese reaches 72.6 ten thousand tons and the production of sheep butter reaches 6.61 ten thousand tons all over the world in 2018. China has no own milk sheep variety, the production quantity of the sheep milk is limited, and the domestic market for producing cheese by using the sheep milk does not exist.
The sheep milk is from the dairy sheep, and the dairy sheep industry is an important component of the dairy industry and is a distinctive industry of young people in the dairy industry. The worldwide dairy sheep industry is primarily focused on the mediterranean region, the middle east region and parts of africa. The number of the global milk sheep in 2019 is 2.5 hundred million, the total yield of the sheep milk is 1058.79 ten thousand tons, and the yield accounts for 1.15 percent of the total milk yield. The species resources of the dairy sheep in the world mainly comprise Dongfrui, racohn, arwaxi and the like. The method is characterized in that no specialized dairy sheep variety exists in China, cross breeding is mainly introduced from local sheep varieties, in order to accelerate the development of the dairy sheep industry in China, the specialized dairy sheep variety is cultivated, and the milk yield and the protein and fat content of one lactation period of the local sheep variety in China are improved. The invention provides a breeding method of a new dairy sheep variety, which aims to shorten the breeding cycle of the dairy sheep, quickly improve the milk yield and the protein and fat contents of one lactation cycle of local sheep varieties in China, and strive to solve the situation that the dairy sheep in China completely depends on import and the problem that the dairy sheep products completely depend on imported 'neck', so that the number and the quality of the dairy sheep varieties autonomously cultivated in China are greatly improved, and the breeding method contributes to the self-strength of country happiness, supply side structure reform and consumption upgrade.
The invention content is as follows:
in order to solve the technical problems, the new dairy sheep variety cultivated by the method has white fur on the whole body, high growth and development speed, strong disease resistance, high milk yield and high protein and fat content, the milk yield in one lactation period is more than 320 kg, the protein content is 5.7-6.3%, and the fat content is 6-6.7%. The female sheep lambing rate is over 230 percent, the adult male sheep weight is 60-85 kg, and the adult female sheep weight is 40-55 kg. Compared with 60-200 kg of milk yield of a Hu sheep in a lactation period, the milk yield of the Hu sheep is remarkably improved, and the protein and fat contents in the sheep milk are improved, so that the sheep milk is suitable for being used as a high-grade cheese product.
The invention discloses a breeding method of a new dairy sheep variety, which comprises the following steps: the technical scheme is that a first-generation sheep flock of the east lake is obtained by taking a Hu sheep as a female parent and taking a Dongfrui sheep as a male parent through hybridization production; then, carrying out progressive hybridization on a ewe in the first-generation Donghu flocks and a Dongfrui ram to obtain second-generation Donghu flocks; then mating the ewes in the second generation ram of the east lake with the ewes in the Wawest to obtain the third generation ram of the east lake, selecting excellent ewes and rams in the third generation ram of the east lake to carry out cross-crossing fixation, group selection, group breeding and breeding improvement, wherein the generation number of the cross-crossing fixation is preferably 2-3 generations, and finally obtaining the new variety of the east lake Ash. The new breed contains 12.5% of Hu sheep blood lineage, 37.5% of Dongfrui sheep blood lineage and 50% of Awaxi sheep blood lineage.
Further, the breeding method of the new variety of the milk sheep comprises the following steps:
firstly: cultivation of Donghu first generation female flocks
And hybridizing the Hu sheep serving as a female parent and the Dongfrui sheep serving as a male parent to obtain a Donghui generation sheep flock, wherein the Donghui generation sheep flock contains 50% of Hu sheep blood ancestors and 50% of Dongfrui sheep blood ancestors. Male sheep in the first generation flock of east lake are completely eliminated, female sheep with the birth weight of more than 2.16 kg, the milk yield of more than 209 kg in one lactation period, high growth speed and high protein and fat content are selected to form the first generation flock of east lake;
secondly, the method comprises the following steps: cultivation of Donghu second generation female flocks
Carrying out progressive hybridization by taking the first-generation Donghu ewe as a female parent and taking the Donghu raw ewe as a male parent to obtain the second-generation Donghu ewe group, wherein the second-generation Donghu ewe group contains 25% of Hu ewe blood lineage and 75% of Donghu raw ewe blood lineage. Male sheep in the second generation of the Donghu flocks are completely eliminated, female sheep select a lactation period to produce milk with the milk yield of more than 265 kg, and female sheep with high protein and fat content form the second generation of the Donghu flocks;
thirdly, the method comprises the following steps: culture of three generations of sheep flocks in Donghu lake
The Donghu third generation sheep group is obtained by taking the Donghu second generation ewe as a female parent and taking the Arwa west sheep as a terminal male parent for hybridization, wherein the Donghu third generation sheep group contains 12.5 percent of Hu sheep blood lineage, 37.5 percent of Dongfruisheng sheep blood and 50 percent of Arwa west sheep blood lineage. The weight of an adult ram is 60-80 kg in the Donghu A three-generation sheep flock, the genetic potential is large, and the growth speed is high; the weight of the ewe is 35-46 kg, the milk yield of the ewe in one lactation period is more than 294 kg, the protein content of the ewe is 5.3% -5.8%, the fat content of the ewe is 5.7% -6.3%, the ewes are subjected to selfing, cross-crossing fixation and group selection and breeding, purification and rejuvenation are carried out, and finally a new Donghu milk sheep variety is bred.
Further, the selection criteria of the female Hu sheep are as follows: white quilt hair, straight back and waist, medium physique, no angle, long and narrow head, raised nose bridge, large and drooping ears, long and thin neck, long and narrow trunk, slight drooping abdomen, thin and high limbs, thick, thin and short abdominal hair, and firm physique. The growth and development of ewe lambs are fast, the weight of a weaned ewe is more than 21 kg in the third month, and the weight of an adult ewe is 33.8-46.7 kg.
Further, the selection criteria of the male parent Dongfrui raw sheep are as follows: big physique, good body structure, white quilt hair, wide and long trunk, firm waist, round rib arch, slightly inclined hip, thin and long tail and no hair. The weight of the adult ram is 90-120 kg, and the shearing amount is 5-6 kg; the sexual maturity is early, and the ram can be used for hybridization when the ram is 7-8 months old.
Further, the selection standard of the male parent Arvarez is as follows: slender neck, medium-sized legs and firm hoofs. The size of the adult ram is medium, the adult ram is 60-90 kg in weight, horned, about 40-50 cm long, drooping ears, about 15 cm long and 9 cm wide. The Avasi sheep has a medium-sized fat tail, the adult male sheep has a tail length of 34-38 cm and a tail width of 30-32 cm, and weighs about 12 kg, most of the hair is milky white, and brown or black hair is arranged at the neck and head parts.
Further, in the hybridization production process, the artificial insemination technology is preferably selected, and the number ratio of the male parent to the female parent is male parent to female parent = 1.
Furthermore, the improvement of the cross fixing, the group selection and the breeding is carried out by adopting a phenotype selection method and a FecB gene detection technology.
The method for breeding the new variety of the dairy sheep Donghu A has the advantages that the new variety of the dairy sheep Donghu A bred by the method is white in all-over fur, high in growth and development speed, strong in disease resistance, high in milk yield and high in protein and fat content, the milk yield in one lactation period is more than 320 kg, the protein content is 5.7% -6.3%, and the fat content is 6% -6.7%. The female sheep lambing rate is over 230 percent, the adult male sheep weight is 60-85 kg, and the adult female sheep weight is 40-55 kg. Compared with 60-200 kg of milk yield of a Hu sheep in a lactation period, the milk yield of the Hu sheep is remarkably improved, and the protein and fat contents in the sheep milk are improved, so that the sheep milk is suitable for being used as a high-grade cheese product.
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FIG. 1 is a schematic diagram of cross breeding and cross-hatching fixation of a breeding method of a new species of a milk sheep.
Detailed Description
The present invention will be described in detail with reference to the following examples.
The invention discloses a breeding method of a new dairy sheep variety, which comprises the following steps: the technical scheme is that a first-generation sheep flock of the east lake is obtained by taking a Hu sheep as a female parent and taking a Dongfrui sheep as a male parent through hybridization production; then, carrying out progressive hybridization on a ewe in the first-generation Donghu flocks and a Dongfrui ram to obtain second-generation Donghu flocks; then mating the ewes in the second generation ewe group of the Donghu with the ewes of the Wawa west to obtain a third generation ewe group of the Donghu Ati, selecting excellent ewes and rams in the third generation ewes of the Donghu Ati to carry out cross-crossing fixation, group selection group breeding and breeding improvement, wherein the generation number of the cross-crossing fixation is preferably 2-3 generations, and finally obtaining a new variety of the Donghu Ati. The new breed contains 12.5% of Hu sheep blood lineage, 37.5% of Dongfrui sheep blood lineage and 50% of Awaxi sheep blood lineage.
Further, the breeding method of the new variety of the milk sheep comprises the following steps:
firstly, the method comprises the following steps: cultivation of Donghu first generation female flocks
And hybridizing by taking the Hu sheep as a female parent and taking the Dongfrui raw sheep as a male parent to obtain a Donghrui first-generation sheep flock, wherein the Donghrui first-generation sheep flock contains 50% of Hu sheep blood ancestors and 50% of Dongfrui raw sheep blood ancestors. Male sheep in the first generation flocks of the east lake are completely eliminated, female sheep with the birth weight of more than 2.16 kg, the milk yield of more than 209 kg in one lactation period, high growth speed and high protein and fat content are selected to form the first generation flocks of the east lake;
secondly, the method comprises the following steps: cultivation of Donghu second generation female flocks
Carrying out progressive hybridization by taking the first-generation Donghu ewe as a female parent and taking the Donghu raw ewe as a male parent to obtain the second-generation Donghu ewe group, wherein the second-generation Donghu ewe group contains 25% of Hu ewe blood lineage and 75% of Donghu raw ewe blood lineage. Male sheep in the second generation of the Donghu flocks are completely eliminated, female sheep select a lactation period to produce milk with the milk yield of more than 265 kg, and female sheep with high protein and fat content form the second generation of the Donghu flocks;
thirdly, the steps of: cultivation of Donghu A third generation sheep flock
The Donghu third generation sheep group is obtained by taking the Donghu second generation ewe as a female parent and taking the Arwa west sheep as a terminal male parent for hybridization, wherein the Donghu third generation sheep group contains 12.5 percent of Hu sheep blood lineage, 37.5 percent of Dongfruisheng sheep blood and 50 percent of Arwa west sheep blood lineage. The weight of an adult ram is 60-80 kg in the Donghu A three-generation sheep flock, the genetic potential is large, and the growth speed is high; the weight of the ewe is 35-46 kg, the milk yield of the ewe in one lactation period is more than 294 kg, the protein content of the ewe is 5.3% -5.8%, the fat content of the ewe is 5.7% -6.3%, the ewes are subjected to selfing, cross-crossing fixation and group selection and breeding, purification and rejuvenation are carried out, and finally a new Donghu milk sheep variety is bred.
The new variety has a milk yield of over 320 kg in a lactation period, a protein content of 5.7-6.3 percent and a fat content of 6-6.7 percent. The lamb laying rate of the ewes is over 230 percent, the weight of the adult rams is 60-85 kg, and the weight of the adult ewes is 40-55 kg. White hair of the whole body, high growth and development speed, strong disease resistance and good adaptability.
Further, the selection criteria of the female Hu sheep are as follows: white quilt hair, straight back and waist, medium physique, no angle, long and narrow head, raised nose bridge, large and drooping ears, long and thin neck, long and narrow trunk, slight drooping abdomen, thin and high limbs, thick, thin and short abdominal hair, and firm physique. The growth and development of ewe lambs are fast, the weight of a weaned ewe is more than 21 kg in the third month, and the weight of an adult ewe is 33.8-46.7 kg.
Further, the selection criteria of the male parent Dongfrui raw sheep are as follows: big physique, good body structure, white quilt hair, wide and long trunk, firm waist, round rib arch, slightly inclined hip, thin and long tail and no hair. The weight of the adult ram is 90-120 kg, and the shearing amount is 5-6 kg; the sexual maturity is early, and the ram can be used for hybridization when the ram is 7-8 months old.
Further, the selection standard of the male parent Arvarez is as follows: slender neck, medium-sized legs and firm hoofs. The size of the adult ram is medium, the weight of the adult ram is 60-90 kg, the adult ram is angular, the adult ram is about 40-50 cm long, the ear is drooped, the ear is about 15 cm long, and the adult ram is 9 cm wide. The Avasi sheep has fat tail with medium size, adult male sheep tail with length of 34-38 cm, tail width of 30-32 cm and weight of about 12 kg, and most of hair is milky white, and there is brown or black hair at neck and head.
Further, in the process of crossing fixation, an artificial insemination technology is preferably selected, and the number ratio of the male parent to the female parent is male parent to female parent = 1.
Furthermore, the improvement of the cross fixing, the group selection and the breeding is carried out by adopting a phenotype selection method and a FecB gene detection technology.
The Dongfrui sheep are the best variety of the world sheep varieties for producing milk at present. The variety is native to East friesian (East Friensian) regions along the coast of the north sea in the northwest of the netherlands and germany. The breed was originally formed by crossing several native breeds in the netherlands with one sheep breed introduced from the gulf of guinea in the beginning of the 17 th century. It is also believed by scholars that the breed is very similar to Dutch Florin, belgium Franciselae and France Frandard, and that these sheep breeds are widely used for family milking before people use milk, and modern east Florin sheep should be bred from these breeds. As early as 1750 years, the variety can be fixed and exported to Litao regions, so the breeding history of the variety has nearly 270 years.
The Dongfrui raw sheep are of a larger body type. The legs of the variety are long and thin, and the buttocks are narrow. The head, legs and tail were hairless or hairless. The skin is thin, white and slightly pink. The Dongfrui sheep had no wool on their tail, so there was a nickname for the rat tail sheep. The Dongfrui raw sheep generally have no horn; some had only a little horn bud. The Dongfrui sheep has a large breast room and is the organ base of large milk secretion. The breast morphology of this variety varies greatly from individual to individual, and nipples are generally located higher on either side of the breast rather than at the bottom, making it difficult for the machine to completely express milk in the breast. The milker must typically lift the bottom of the breast above teat level to clear the milk from the teat cistern.
The reproductive rate of the Dongfrui sheep can reach 230 percent, and the Dongfrui sheep is one of the sheep varieties with the highest fecundity. The Dongfrui raw sheep has high reproductive capacity and high milk yield, and can produce more lambs. However, the uniformity of the lamb carcass is poor, but the hybrid lamb is hybridized by taking meat sheep varieties such as Safex, dorper or Texeel as male parents, the growth speed of the hybrid lamb is obviously increased, and the carcass quality is better.
The Dongfrui sheep are sexually mature at the age of 7-8 months, the ewes can be bred when the weight of the ewes at the age of 10 months generally reaches more than 70% of the adult weight, and the best breeding age of the rams is 18 months. The breeding season of the Dongfrui sheep is short, the sheep can be estrated and mated within 16 weeks after the longest day in one year, and the optimal breeding time is 9-11 months of one year.
The Arwa sheep is the sheep variety with the largest quantity and the widest distribution in southwestern Asia. Mainly raised in Iraq, syria, ribayone, israel, saudi Arabia and Turkish countries. The Arwa west sheep is a desert grazing sheep variety of the middle east west Asia, is later bred into a milk sheep with good adaptability in Israel, has good adaptability to the subtropical zone of the Mediterranean sea and the arid climate environment of the desert, and is divided into meat, wool and milk varieties.
The Amahi sheep has long and thin neck, medium legs, and firm hoofs. The size of the adult ram is medium, the weight of the adult ram is 60-90 kg, and the weight of the adult ewe is 45-55 kg. The Avasi sheep had long and narrow heads. The rams have horns, which are about 40-50 cm long, while the ewes generally have no horns or have a little short horns. The ears were dropped and the ears were approximately 15 cm long and 9 cm wide. The Avasi sheep has fat tails with medium size, adult ewe tails 17-19 cm long, tail width 15-16 cm, weight about 6 kg, and ram tails 2 times as large as ewes. The majority of the hairs are milky white, and brown or black hairs are arranged at the neck and the head.
The milk yield of the Avasi milch goat bred in Israel in each lactation period can reach 300 kg, the high-strength bred strain can reach more than 750 kg, the milk protein rate is 5-7%, and the milk fat rate is 6-8%. The variety has the outstanding characteristics of strong stress resistance and big fat tail, which is unfavorable for the milk production character.
The Avasi milk sheep is a rough sheep and produces carpet hair. The average wool production of an adult ram is 2.25 kg, and the average wool production of an adult ewe is 1.75 kg.
The Avasi rams and ewes reach sexual maturity at about 8 months of age and about 9 months of age, respectively. The breeding season of ewes lasts from 4 months to 9 months, and sexually mature rams can be bred all the year round. The normal oestrus cycle of ewes is 15-20 days (on average 17 days). The breeding season is estrus for 16-59 h. The reproductive performance of the Arwasi sheep is very low, and is only about 110%. The pregnancy duration varies from 149 to 155 days (on average 152 days).
The new variety of donghua donkey-hide milk sheep bred by the method has the characteristics of white fur of the whole body, high growth and development speed, strong disease resistance, high milk yield and high protein and fat content, and has the milk yield of over 320 kg in one lactation period, the protein content of 5.7-6.3 percent and the fat content of 6-6.7 percent. The lamb laying rate of the ewes is over 230 percent, the weight of the adult rams is 60-85 kg, and the weight of the adult ewes is 40-55 kg. Compared with 60-200 kg of milk yield of a Hu sheep in a lactation period, the milk yield of the Hu sheep is remarkably improved, and the protein and fat contents in the sheep milk are improved, so that the sheep milk is suitable for being used as a high-grade cheese product.
Claims (6)
1. A breeding method of a new species of milk sheep takes a Hu sheep as a female parent and takes an Dongfrui raw sheep as a male parent to carry out hybridization production to obtain a first-generation Donghui sheep group; then, carrying out progressive hybridization on a ewe in the first-generation Donghu flocks and a Dongfrui ram to obtain second-generation Donghu flocks; mating the ewes in the second generation of the Donghu sheep flock with the ewes in the Wawest to obtain a Donghu Ati third generation sheep flock, selecting excellent ewes and rams in the Donghu Ati third generation sheep flock for transverse crossing fixation, group selection, group breeding and breeding improvement, wherein the generation number of the transverse crossing fixation is preferably 2-3 generations, and finally obtaining a Donghu Ati new variety which contains 12.5% of Hu sheep blood lineage, 37.5% of Dongfu Sheng sheep blood lineage and 50% of Wawest sheep blood lineage;
the method is characterized by comprising the following steps:
the breeding of the first generation of the female flocks in the east lake,
the method comprises the following steps of hybridizing a Hu sheep serving as a female parent and a Dongfrui sheep serving as a male parent to obtain a Donghrui first-generation sheep flock, wherein the Donghrui first-generation sheep flock contains 50% of Hu sheep blood systems and 50% of Dongfrui sheep blood systems, male sheep in the Donghrui first-generation sheep flock are completely eliminated, female sheep are selected to have a primary birth weight of 2.16 kg, a milk yield in a lactation period of more than 209 kg, a growth speed is high, and female sheep with high protein and fat contents form the Donghrui first-generation female sheep flock;
the breeding of the second generation of the ewe group in the east lake,
carrying out progressive hybridization by taking the first-generation Donghu ewes as female parents and Dongfrui ewes as male parents to obtain the second-generation Donghu ewe flock, wherein the second-generation Donghu ewe flock contains 25% of lake ewe blood systems and 75% of Dongfrui ewe blood systems, male goats in the second-generation Donghu ewe flock are completely eliminated, the ewes select one lactation cycle to produce milk of more than 265 kg, and the ewes with high protein and fat content form the second-generation Donghu ewe flock;
the breeding of the third generation of the Donghu Argentine flocks,
the Donghu third-generation Aries are obtained by taking the Donghu second-generation ewes as female parents and the Arwa west ewes as terminal male parents through hybridization, wherein the Donghu third-generation Aries contain 12.5 percent of Hu sheep ancestry, 37.5 percent of Dongfrui raw sheep blood and 50 percent of Arwa west Yang Xietong, and adult rams in the Donghu third-generation Aries are 60-80 kg in weight, large in genetic potential and high in growth speed; the weight of the ewe is 35-46 kg, the milk yield of the ewe in one lactation period is more than 294 kg, the protein content of the ewe is 5.3% -5.8%, the fat content of the ewe is 5.7% -6.3%, the ewe is subjected to selfing, cross-crossing fixation, group selection and group breeding, purification and rejuvenation, and finally a new Donghu milk sheep variety is bred.
2. The method for breeding a new variety of milk sheep according to claim 1, characterized in that: the selection criteria of the female Hu sheep are as follows: white quilt hair, flat back and waist, medium physique, no angle, long and narrow head, raised nose bridge, large and drooping ears, long and thin neck, long and narrow trunk, slight drooping abdomen, thin and high limbs, thick, thin and short abdominal hair, firm body, fast growth and development of ewes and lambs, weight of weaned ewes of three months old over 21 kg, and weight of adult ewes between 33.8 and 46.7 kg.
3. A method of breeding a new variety of milk sheep as claimed in claim 1 or 2, characterized by: the selection criteria of the male parent Dongfrui raw sheep are as follows: the ram sheep has the advantages of large physique, good body structure, white quilt hair, wide and long body, firm waist, round rib arch, slightly inclined hip, thin and long tail, no hair, weight of 90-120 kg of adult rams and hair shearing amount of 5-6 kg; the ram is used for hybridization with early sexual maturity and the ram is 7-8 months old.
4. A method of breeding a new variety of milk sheep as claimed in claim 1 or 2, characterized by: the selection standard of the male parent Arwa Western sheep is as follows: the sheep has the advantages of slender neck, medium leg length and thickness, firm hoof and medium body size, the weight of an adult ram is 60-90 kg, the adult ram is angular, 40-50 cm long, drooping ears are 15 cm long and 9 cm wide, the Arwa Xiyang sheep has medium fat tail, the adult ram is 34-38 cm long, 30-32 cm wide and 12 kg heavy, most of hair is milk white, and brown or black hair exists at the neck and the head.
5. A method of breeding a new variety of milk sheep as claimed in claim 1 or 2, characterized by: in the process of crossing fixation, an artificial insemination technology is selected, and the number ratio of the male parent to the female parent is male parent to female parent = 1.
6. A method of breeding a new variety of milk sheep as claimed in claim 1 or 2, characterized in that: the improvement of the cross-crossing fixation, the group selection and the group breeding and the breeding are carried out by adopting a phenotype selection method and a FecB gene detection technology.
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