Breeding method suitable for captivity of polyembryonic meat type sheep breeding sheep in Taihang mountainous area

Abstract

The invention discloses a breeding method suitable for captive multi-fetal meat type sheep breeding sheep in a Taihang mountainous area, which comprises the following steps: (1) taking Australian white sheep carrying homozygous polypeptide genes as a female parent and hornless Nanshi sheep as a male parent to obtain a hybrid A-F1 generation; (2) taking the saffok sheep carrying the homozygous polypeptide gene as a female parent and the pomace-free euryale sheep as a male parent to obtain a hybrid B-F1 generation; (3) hybridizing the excellent female parent of the A-F1 generation with the excellent male parent of the homozygous B-F1 generation with the polypeptide gene, and hybridizing the excellent male parent of the homozygous A-F1 generation with the polypeptide gene with the excellent female parent of the B-F1 generation to obtain a hybridized F2 generation; (4) taking the F2 generation as a female parent and the hornless Dorper sheep as a male parent to obtain a hybrid F3 generation; and (5) carrying out cross fixation by taking the hybrid generation F3 as a female parent and a male parent to obtain a target sheep core group. The breeding sheep bred by the method are suitable for captivity in Taihang mountainous areas, have multiple births and no horns, and are high in growth speed and stable in hereditary character.

Description

Technical Field

[0001] The invention relates to the technical field of livestock breeding, and more particularly to a method for breeding breeder sheep suitable for raising multiple-birth meat-type sheep in the Taihang Mountain area. Background Art

[0002] Sheep are one of the most adaptable livestock to the external environment. They have a wide range of diets, are tolerant to roughage, and have strong resistance to adversity. Raising sheep requires little investment, has a fast turnover, stable benefits, and a high rate of return. In recent years, changes in domestic and foreign mutton market demand have provided huge space for the development of the sheep industry, making sheep production a golden industry.

[0003] The livestock and poultry breeding industry is the foundation and forerunner of the development of modern animal husbandry. The development level of the breeding industry in the Taihang Mountain area is low, the marketization lags behind, and the role of improved breeds in supporting the industry is not obvious. This is mainly reflected in the lack of good breeds of multi-birth meat-producing sheep suitable for the Taihang Mountain area.

[0004] The Taihang Mountain area has a temperate continental monsoon climate with a short frost-free period, a large temperature difference between day and night, and a relatively rich source of forage. Existing hybrid sheep breeds grow slowly, have longer hair, and produce less meat and milk. In addition, the growth and development of their horns affects feeding and management, resulting in a waste of forage.

[0005] At present, the breeding of meat-type sheep in the Taihang Mountain area is mainly based on hybridization and breeding. There is no three-way or more multi-way hybridization and breeding, and there is no new breed of meat-type sheep suitable for captive breeding in the Taihang Mountain area.

[0006] Therefore, it is very important to study the method of rapidly breeding a core group of multi-parity meat-type sheep suitable for captive breeding in the Taihang Mountains. Summary of the invention

[0007] In view of this, the present invention provides a breeding method for captive multi-birth meat-type sheep in Taihang Mountain area.

[0008] In order to achieve the above object, the present invention adopts the following technical solution: A method for breeding multi-birth meat-type sheep suitable for captive breeding in Taihang Mountain area, comprising the following steps: (1) Using Australian white sheep carrying the homozygous multiparous gene as the female parent and hornless South Hill sheep as the male parent, the hybrid generation A-F1 was obtained; Among them, the Australian white sheep carrying the multiple birth gene is used as the female parent, ensuring that the hybrid offspring carry the multiple birth gene; Using hornless Nanqiu sheep as the sire improves the daily weight gain and weaning weight of the A-F1 generation of breeding sheep, ensuring the growth and development performance of the offspring.

[0009] (2) Using homozygous Suffolk sheep carrying the multiparous gene as the hybrid mother and hornless East Friesian sheep as the father to obtain the hybrid B-F1 generation; Select East Friesian sheep as the B-F1 hybrid father to improve the lactation performance of B-F1 breeding ewes and ensure the survival rate of offspring lambs; Using Suffolk sheep carrying the multiple-birth gene as the maternal parent ensures that the hybrid offspring carry the multiple-birth gene.

[0010] (3) By hybridizing an excellent A-F1 generation mother with a fertility gene with a homozygous B-F1 generation excellent father with a fertility gene, and hybridizing an excellent A-F1 generation father with a homozygous fertility gene with an excellent B-F1 generation mother with a fertility gene, we can obtain an excellent F2 generation with fertility genes.

[0011] (4) Using an excellent female sheep from the F2 generation with a fertility gene as the female parent and a homozygous hornless Dorper sheep with a fertility gene as the male parent, a hybrid F3 generation with a fertility gene and no horns is obtained.

[0012] (5) The homozygous F3 male parent with the fertility gene is cross-crossed with the excellent F3 female parent with the fertility gene to obtain the target sheep core group.

[0013] Preferably, the A-F1 generation ewes selected in step (1) have a birth weight of more than 2.1 kg, a weaning weight of more than 33 kg at three months of age, and an adult weight of 95-115 kg. The ewes have white fur, straight back and waist, medium physique, no horns (the horn genotype of the mother is pp according to molecular identification), a narrow head, a slender neck, a narrow body, a slightly drooping abdomen, thin and tall limbs, thick abdominal hair, a strong physique, and a multi-birth gene (after multi-birth gene screening, the mother is homozygous or heterozygous for the multi-birth gene), as the excellent A-F1 generation mothers in step (3).

[0014] Preferably, the B-F1 generation ewes selected in step (2) have a birth weight of more than 3.5 kg, a weaning weight of more than 42 kg at three months of age, and an adult weight of 90 to 100 kg. The ewes have white fur, straight back and waist, medium physique, no horns (the horn genotype of the mother is pp according to molecular identification), a narrow head, a slender neck, a narrow body, a more obvious sagging abdomen, thin and high limbs, thick, sparse and short abdominal hair, a strong physique, and a multi-birth gene (after multi-birth gene screening, the mother is homozygous or heterozygous for the multi-birth gene), as the excellent B-F1 generation mother in step (3).

[0015] Preferably, in steps (3) to (5), the male parent's horn genotype is pp and contains a homozygous FecB, and the female parent's horn genotype is pp or Pp and contains a heterozygous or homozygous FecB.

[0016] Preferably, the maternal parent in step (2) and step (4) and the paternal parent and maternal parent in step (5) must meet the following requirements: the birth weight is greater than 3.5 kg and the weaning weight at three months of age is greater than 33 kg.

[0017] Preferably, the hybridization ratio of the male parent to the female parent in steps (1) to (5) is 1:20-25.

[0018] Preferably, the feeding method selected in steps (1) to (5) is a pen-raising method, and the pigs can move freely between the pens and the houses during the day from late spring to late autumn. From late autumn to late spring of the following year, the ambient temperature in the house is not less than 5°C and the humidity is 30%-50% at night.

[0019] Preferably, the nighttime supplementary feeding is: an average of 0.25 kg / head·d of first-grade green dry oat grass and 0.40 kg / head·d of silage.

[0020] Preferably, the forage is: green hay at an average of 0.5 kg / head·d, silage at 4 kg / head·d, and complete concentrate powder at 0.5 kg / head·d.

[0021] The green hay comprises the following components in parts by weight: 60-70 parts of first-grade oat green hay and 30-40 parts of peanut seedlings.

[0022] The silage comprises the following components in parts by weight: 70-75 parts of corn stalks and 25-30 parts of alfalfa.

[0023] The concentrate powder can be purchased from Henan Jiaozuo Hefeng Feed Co., Ltd., 0.5 kg / head / d.

[0024] It can be seen from the above technical scheme that compared with the prior art, the beneficial effects achieved by the present invention are: it solves the difficult problems of slow growth rate, low meat / milk production, few fetuses, and horns in the Mianyang population in the Taihang Mountains, and cultivates a multi-trait selection hybrid breeding variety with high lactation, high meat production, twin lambs, fast growth rate, hornlessness, and stable genetic performance for sheep that are not used for milking. The variety is suitable for captive breeding in the Taihang Mountains and can cultivate offspring with high survival rate, multiple births, hornlessness, fast growth rate and stable genetic traits. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is the breeding roadmap of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the appended Figure 1 , the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Example 1 (1) Select 1,000 hornless, pure white, large-bodied Australian white sheep carrying the homozygous multiparous gene as female parents and 2,000 portions of hornless, pure white Nanqiu sheep frozen semen as male parents to obtain hybrid A-F1 generation, preferably 1,200 live sheep.

[0028] (2) Select 1,000 hornless, pure white, large-bodied, homozygous multiparous Suffolk sheep as females and hornless, pure white, polled East Friesian sheep as males to obtain hybrid B-F1 generation, preferably 1,200 live sheep.

[0029] (3) 500 excellent A-F1 generation ewes with a birth weight of more than 2.1 kg, a weaning weight of more than 33 kg at three months of age, and an adult weight of 95-115 kg, which are heterozygous or homozygous for the multiparity gene, are hybridized with excellent B-F1 generation homozygous rams or ram frozen semen; and 500 excellent A-F1 generation homozygous sires with the multiparity gene are hybridized with excellent B-F1 generation dams with the multiparity gene to obtain excellent F2 generation with the multiparity gene, preferably 600 live sheep.

[0030] (4) From the F2 generation, select 300 ewes that are heterozygous or homozygous for the multiparity gene, have a horn genotype of pp, are pure white, have a birth weight of more than 2.1 kg, a weaning weight of more than 33 kg at three months of age, and an adult weight of 95-115 kg as the F3 generation hybrid female parents, and select 600 portions of frozen semen from hornless, pure white, and homozygous hornless Dorper sheep with the multiparity gene as the F3 generation hybrid male parents, to obtain the hybrid F3 generation, preferably 550 live sheep.

[0031] (5) From the F3 generation, select rams homozygous for the multiple birth gene, ewes heterozygous or homozygous for the multiple birth gene, rams with a horn genotype of pp, pure white, a birth weight of 3.5 kg or more, a weaning weight of 33 kg or more at three months of age, and the top 30% (in order of growth and development from good to poor) of the rams and ewes with an adult weight of 95-115 kg for cross-crossing and fixation to obtain a core group of 200 live sheep.

[0032] The feeding method is the pen feeding method. From late spring to late autumn, the pigs can move freely between the pens and the houses during the day. From late autumn to late spring of the following year, the temperature in the house should not be lower than 5℃ and the humidity should be 30%-50% at night.

[0033] The required feed is: green hay 0.5kg / head / d on average, silage 4kg / head / d, complete concentrate powder 0.5kg / head / d.

[0034] The green hay consists of the following components in parts by weight: 60-70 parts of first-grade oat green hay and 30-40 parts of peanut vines.

[0035] Silage is composed of the following raw materials in proportions by weight: 70-75 parts of corn stalks and 25-30 parts of alfalfa.

[0036] The required concentrated feed was purchased from Henan Jiaozuo Hefeng Feed Co., Ltd., 0.5 kg / head / d.

[0037] The reproductive performance and lamb production performance of the core group of ewes of the target flock, which is suitable for the Taihang Mountain environment for both meat and dairy purposes, are shown in Table 1.

[0038] Table 1 Reproductive performance and lamb production performance of the core herd of ewes suitable for captive breeding of multi-parity meat-producing sheep in Taihang Mountain area .

[0039] It can be seen from the table that the target sheep flocks are bred with the characteristics of multiple births, fast growth rate and high slaughter rate, and are suitable for breeding and promotion as a captive multiple-birth meat-type sheep breed in the Taihang Mountain area.

Claims

1. A method for breeding multi-birth meat-type sheep suitable for the Taihang Mountain area, characterized in that: The steps include: (1) Using Australian white sheep carrying the homozygous polypeptide gene as the female parent and hornless Southern Hills sheep as the male parent, the hybrid A-F1 generation was obtained; (2) Using Suffolk sheep carrying the homozygous polypeptide gene as the female parent and hornless East Friesian sheep as the male parent, a hybrid B-F1 generation was obtained; (3) The excellent female parent of the A-F1 generation is hybridized with the homozygous excellent male parent of the B-F1 generation with the polypeptide gene, and the homozygous excellent male parent of the A-F1 generation with the polypeptide gene is hybridized with the excellent female parent of the B-F1 generation to obtain the hybrid F2 generation; (4) Using female sheep from the F2 generation as the maternal parent and homozygous hornless Dorper sheep with the polypeptide gene as the paternal parent, a hybrid F3 generation is obtained; (5) The hybrid F3 generation is used as the maternal and paternal parent for cross-crossing fixation, in which the paternal parent is a homozygote with the polypeptide gene, to obtain the target sheep core group.

2. A method for breeding multiple-birth meat-type sheep suitable for captive breeding in Taihang Mountain area as claimed in claim 1, characterized in that: In step (3), the excellent A-F1 generation mothers meet the following conditions: the birth weight of A-F1 generation ewes is more than 2.1 kg, the weaning weight at three months of age is more than 33 kg, and the adult weight is 95-115 kg; the ewes have white fur, straight back and waist, medium physique, no horns, horn genotype is pp, narrow head, slender neck, narrow body, slightly drooping abdomen, thin and tall limbs, thick abdominal hair, strong physique, and have a gene for multi-birth.

3. The method for breeding multiple-birth meat-type sheep suitable for the Taihang Mountain area as claimed in claim 1, characterized in that: In step (3), the excellent B-F1 generation mothers meet the following conditions: the birth weight of the B-F1 generation ewes is more than 3.5 kg, the weaning weight at three months of age is more than 42 kg, and the adult weight is 90-100 kg; the ewes have white fur, straight back and waist, medium physique, no horns, horn genotype is pp, the head is narrow and long, the neck is slender, the body is narrow and long, the abdomen is more obviously sagging, the limbs are thin and tall, the abdominal hair is coarse, sparse and short, the physique is strong, and there is a gene for multiple births.

4. The method for breeding multiple-birth meat-type sheep suitable for the Taihang Mountain area as claimed in claim 1, characterized in that: In steps (3)-(5), the genotype of the male parent is pp and contains the homozygous FecB, and the genotype of the female parent is pp or Pp and contains the heterozygous or homozygous FecB.

5. The method for breeding multiple-birth meat-type sheep suitable for the Taihang Mountain area as claimed in claim 1, characterized in that: The maternal parent in step (2) and step (4) and the paternal parent and maternal parent in step (5) must meet the following requirements: the birth weight is greater than 3.5 kg and the weaning weight at three months of age is greater than 33 kg.

6. The method for breeding multiple-birth meat-type sheep suitable for the Taihang Mountain area as claimed in claim 1, characterized in that: The hybridization ratio of the male parent to the female parent in the steps (1) to (5) is 1:20-25.

7. The method for breeding multiple-birth meat-type sheep suitable for captive breeding in Taihang Mountain area as claimed in claim 1, characterized in that: The feeding method in steps (1) to (5) is a captive breeding method. From late spring to late autumn, the pigs can move freely between the pens and the houses during the day. From late autumn to late spring of the following year, the ambient temperature in the house should not be lower than 5°C and the humidity should be 30%-50% at night.

8. The method for breeding multiple-birth meat-type sheep suitable for the Taihang Mountain area as claimed in claim 7, characterized in that: The feed for the enclosures is: an average of 0.5 kg of green hay per head per day, 4 kg of silage per head per day, and 0.5 kg of complete concentrate powder per head per day.

9. A method for breeding multiple-birth meat-type sheep suitable for captive breeding in Taihang Mountain area as claimed in claim 8, characterized in that: The green hay comprises the following components in parts by weight: 60-70 parts of first-grade oat green hay and 30-40 parts of peanut seedlings.

10. A method for breeding multiple-birth meat-type sheep suitable for captive breeding in Taihang Mountain area as claimed in claim 8, characterized in that: The silage comprises the following components in parts by weight: 70-75 parts of corn stalks and 25-30 parts of alfalfa.

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