A method for cultivating a dual-purpose wool and meat sheep breed with 32 to 46 wool counts

Abstract

The present invention provides a method for cultivating a wool and meat dual-purpose sheep breed with 32 to 46 branches, belonging to the technical field of livestock breeding. By formulating a comprehensive selection index, the present invention selects and breeds Weining sheep, Hu sheep, and Suffolk sheep for cross-breeding, and cultivates a new breed in which the blood component ratios of Suffolk sheep, Hu sheep, and Weining sheep are 50%, 37.5%, and 12.5% respectively. This new breed can fully combine the excellent characteristics of Suffolk sheep with high meat production, Hu sheep with high lambing rate, Weining sheep with strong climbing ability, good stress resistance, and tolerance to roughage.

Description

Technical Field

[0001] The present invention belongs to the technical field of livestock breeding, and particularly relates to a method for cultivating a meat and wool dual-purpose sheep breed with 32-46 wool counts. Background Art

[0002] Weining sheep belongs to the meat and wool dual-purpose coarse wool sheep breed and is one of the local sheep breeds in Guizhou Province. It has excellent characteristics such as being resistant to roughage, having strong disease resistance, good adaptability, being flexible, having strong climbing ability, a wide foraging range, early maturity, and good felting performance of wool. However, its small size, slow growth and development, low slaughter rate, low lambing rate, and poor reproductive performance reduce production efficiency and greatly limit the development of Weining sheep. The whole body is poorly covered with hair, and there are many black or yellowish-brown spots on the head, ears, face, lips, withers, and lower parts of the limbs, and the wool production is low.

[0003] Hu sheep belongs to the fur and meat dual-purpose coarse wool sheep breed. It is native to the Taihu Lake Basin between Jiangsu and Zhejiang. It has the advantages of fast growth and development, early sexual maturity, estrus throughout the year, high reproductive rate, beautiful lambskin patterns, and resistance to high temperature and humidity. It has good adaptability and is suitable for indoor feeding. It gives birth to 3 litters in two years, with 1-3 lambs per litter, and the lambing rate of ewes is 180%-250%. The milk production is high, and the lambs grow rapidly. The wool production is 1-2 kg, the main fineness of the wool is 44 wool counts, and the clean wool rate is more than 60%, which is suitable for weaving carpets and rough woolen fabrics.

[0004] Suffolk sheep is a meat and wool dual-purpose sheep breed with a large body size and weight among sheep. It is native to the UK, resistant to roughage, with strong disease resistance and good feeding performance. The body is covered with white wool, and the head and limbs are covered with black wool. It has excellent characteristics such as early maturity, large body size, fast growth and development, good meat quality, high reproductive rate, and strong adaptability. The head is short and wide, the nose bridge is raised, the ears are large, and both rams and ewes have no horns. The neck is long, deep, thick and wide, the chest is wide, and the back, waist and hips are long, wide and flat. The muscles are plump and the hindquarters are well developed. The weight of adult rams is 100-136 kg, and that of adult ewes is 70-96 kg. The body is covered with white wool, the head and limbs are black and have no wool coverage. The wool shearing amount of adult rams is 5-6 kg, that of adult ewes is 2.5-3.6 kg, the wool length is 7-8 cm, the fineness is 50-58 wool counts, and the clean wool rate is about 60%. The lambing rate of ewes after lambing is 160%-180%.

[0005] At present, there is little crossbreeding utilization based on Weining sheep. To make up for the deficiencies in the production performance of Weining sheep, exploring the cultivation of its new breed is an urgent problem to be solved. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a method for cultivating a new sheep breed, and the cultivated sheep breed fully combines the excellent characteristics of Suffolk with high meat production, Hu sheep with high lambing rate, Weining sheep with strong climbing ability, good stress resistance and resistance to roughage.

[0007] To achieve the above-mentioned invention object, the present invention provides the following technical solutions:

[0008] The present invention provides a method for cultivating a dual-purpose meat and wool sheep breed of 32 to 46 branches, comprising the following steps:

[0009] Using Weining sheep as the female parent and Hu sheep as the male parent for hybridization to obtain the Huwei hybrid F1 generation;

[0010] Using the Huwei hybrid F1 generation as the female parent and Suffolk sheep as the male parent for hybridization to obtain the Sahuwei hybrid F2 generation;

[0011] Using the Sahuwei hybrid F2 generation as the female parent and Hu sheep as the male parent for hybridization to obtain the ①-Sahuwei hybrid F3 generation;

[0012] Using the Sahuwei hybrid F2 generation as the female parent and Suffolk sheep as the male parent for hybridization to obtain the ②-Sahuwei hybrid F3 generation;

[0013] Performing reciprocal crosses on the ①-Sahuwei hybrid F3 generation and the ②-Sahuwei hybrid F3 generation to obtain the Sahuwei hybrid F4 generation; screening the male and female parents of the Sahuwei hybrid F4 generation for inbreeding fixation and self-group breeding to obtain a dual-purpose meat and wool sheep breed of 32 to 46 branches.

[0014] Preferably, in the female parent of the Huwei hybrid F1 generation, the blood components account for 50% of the blood of Hu sheep and Weining sheep respectively.

[0015] Preferably, in the female parent of the Sahuwei hybrid F2 generation, the blood components account for 50%, 25%, and 25% of the blood of Suffolk sheep, Hu sheep, and Weining sheep respectively.

[0016] Preferably, in the ①-Sahuwei hybrid F3 generation, the blood components account for 25%, 62.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

[0017] Preferably, in the ②-Sahuwei hybrid F3 generation, the blood components account for 75%, 12.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

[0018] Preferably, the Sahuwei hybrid F4 generation is screened with the meat production rate and lambing rate as the targets.

[0019] More preferably, in the Sahuwei hybrid F4 generation, the blood components account for 50%, 37.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

[0020] Preferably, the Weining sheep ewes, Hu sheep rams, and Suffolk sheep rams are selected by the comprehensive selection index method as the Weining sheep ewes, Hu sheep rams, and Suffolk sheep rams with an index higher than the average.

[0021] More preferably, the comprehensive selection index method selects a comprehensive selection index for unrelated traits based on the growth and development level and reproductive performance of sheep, identifies Weining sheep, Hu sheep, and Suffolk sheep, and selects Weining sheep ewes, Hu sheep rams, and Suffolk sheep rams with an index higher than the average to form a breeding base population.

[0022] More preferably, the calculation formula of the comprehensive selection index is

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] According to the formulated comprehensive selection index, the present invention breeds Weining sheep, Hu sheep, and Suffolk sheep. Through cross-breeding among the three breeds of sheep and by using rapid propagation technical means such as estrus synchronization, artificial insemination, superovulation, and embryo transfer, a new breed is finally cultivated, in which the blood component ratios of Suffolk sheep, Hu sheep, and Weining sheep are 50%, 37.5%, and 12.5% respectively. This breed can fully integrate the excellent characteristics of Suffolk sheep with high meat production, Hu sheep with high lambing rate, Weining sheep with strong climbing ability, good stress resistance, and tolerance to roughage. After testing, its key indexes such as reproductive performance, growth performance, and meat production performance are all higher than those of Weining sheep. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a technical roadmap for the cultivation of a new breed of sheep;

[0026] Figure 2 is a cross-breeding diagram of F1 generation "Huwei cross" and Suffolk ram;

[0027] Figure 3 is a picture of the new breed "Sahuwei cross" lambs;

[0028] Figure 4 is a picture of adult male and female sheep of the new breed "Sahuwei cross". DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention provides a method for cultivating a meat and wool dual-purpose sheep breed with 32 - 46 branches, including the following steps:

[0030] Using Weining sheep as the female parent and Hu sheep as the male parent for cross-breeding to obtain the F1 generation of Huwei cross;

[0031] Using the F1 generation of Huwei cross as the female parent and Suffolk sheep as the male parent for cross-breeding to obtain the F2 generation of Sahuwei cross;

[0032] Using the F2 generation of Sahuwei cross as the female parent and Hu sheep as the male parent for progressive cross-breeding to obtain the ① - F3 generation of Sahuwei cross;

[0033] Using the Lakeway hybrid F2 generation as the female parent and Suffolk sheep as the male parent for progressive crossbreeding to obtain the ②-Lakeway hybrid F3 generation;

[0034] Conduct reciprocal crosses between the ①-Lakeway hybrid F3 generation and the ②-Lakeway hybrid F3 generation to obtain the Lakeway hybrid F4 generation; Screen the male and female parents of the Lakeway hybrid F4 generation for inbreeding fixation and in-group breeding to obtain 32 to 46 meat-wool dual-purpose sheep breeds.

[0035] In the present invention, in the Lakeway hybrid F1 generation female parent, the blood components account for 50% of the blood of Hu sheep and Weining sheep respectively. In a specific embodiment of the present invention, using Weining sheep as the female parent and Hu sheep as the male parent for crossbreeding, obtaining and screening excellent Lakeway hybrid F1 generation female sheep, and establishing a basic female sheep flock for the Lakeway hybrid F1 generation, with the blood of Hu sheep and Weining sheep each accounting for 50%.

[0036] In the present invention, in the Lakeway-Suffolk hybrid F2 generation female parent, the blood components account for 50%, 25%, and 25% of the blood of Suffolk sheep, Hu sheep, and Weining sheep respectively. In a specific embodiment of the present invention, using the Lakeway hybrid F1 generation as the female parent and Suffolk sheep as the male parent for crossbreeding, obtaining and screening excellent Lakeway-Suffolk hybrid F2 generation female sheep to form a basic female sheep flock, and the Lakeway-Suffolk hybrid F2 generation contains 50%, 25%, and 25% of the blood of Suffolk sheep, Hu sheep, and Weining sheep respectively.

[0037] In the present invention, in the ①-Lakeway hybrid F3 generation, the blood components account for 25%, 62.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively. In a specific embodiment of the present invention, using the Lakeway-Suffolk hybrid F2 generation as the female parent and Hu sheep as the male parent, obtaining and screening excellent ①-Lakeway hybrid F3 generation to form male and female sheep flocks, and the ①-Lakeway hybrid F3 generation contains 25%, 62.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

[0038] In the present invention, in the ②-Lakeway hybrid F3 generation, the blood components account for 75%, 12.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively. In a specific embodiment of the present invention, using the Lakeway-Suffolk hybrid F2 generation as the female parent and Suffolk sheep as the male parent, obtaining and screening excellent ②-Lakeway hybrid F3 generation to form male and female sheep flocks, and the ②-Lakeway hybrid F3 generation contains 75%, 12.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

[0039] In the present invention, the Lakeway hybrid F4 generation is screened with the meat production rate and lambing rate as the targets.

[0040] In the present invention, the blood components of the F4 generation of the SaHuWei cross account for 50%, 37.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep, respectively. In a specific embodiment of the present invention, the F3 generations of ①-SaHuWei (25% / 62.5% / 12.5%) and ②-SaHuWei (75% / 12.5% / 12.5%) are used for reciprocal crosses to obtain and screen excellent male and female parents of the F4 generation of the SaHuWei cross, and a breeding core group of male and female parents of the F4 generation of the SaHuWei cross is established. The breeding core group of the F4 generation of the SaHuWei contains 50%, 37.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep, respectively.

[0041] In the present invention, the Weining sheep ewes, Hu sheep rams, and Suffolk rams are selected by the comprehensive selection index method as the Weining sheep ewes, Hu sheep rams, and Suffolk rams with an index higher than the average.

[0042] In the present invention, the comprehensive selection index method is used to formulate a comprehensive selection index for uncorrelated traits based on the growth and development level and reproductive performance of sheep, and to identify Weining sheep, Hu sheep, and Suffolk sheep, and select Weining sheep ewes, Hu sheep rams, and Suffolk rams with an index higher than the average to form a breeding foundation group.

[0043] In the present invention, the formula for the comprehensive selection index is W i is the economic importance of the trait, h2 i is the heritability of the trait, P i is the individual phenotypic value, is the average of the individual phenotypic values of the flock.

[0044] In a specific embodiment of the present invention, the individual phenotypic value of the growth and development level is evaluated by the appearance score (P i ). The appearance score standard is formulated based on the age, weight, body length, body height, chest depth, chest width, chest circumference, cannon bone circumference, etc. of the sheep. The full score of the scoring standard is 100 points, and the average appearance score of the flock entering the breeding foundation group is set according to the number of the flock Therefore, the average appearance scores of Weining sheep, Hu sheep, and Suffolk sheep are all determined to be 70 points, and the heritability of the trait (h 2 i ) is determined to be 0.3 with reference to "Livestock Breeding Science" published by the Agricultural Press in November 1980 and edited by the former Inner Mongolia Institute of Animal Husbandry and Veterinary Medicine. The economic importance (W i ) is determined to be 0.3 according to the importance of the growth and development traits in the breeding work; the individual phenotypic value of the reproductive performance is evaluated by the lambing rate. The average lambing rates of Weining sheep, Hu sheep, and Suffolk sheep They are 101.2%, 215%, and 170% respectively, which can be obtained by querying on the "National Standard Information Public Service Platform" (website: https: / / std.samr.gov.cn) according to DB52 / T 1529-2020 Weining Sheep, GB / T 4631-2006 Hu Sheep, and DB15 / T 1416-2018 Suffolk Sheep. The heritability (h 2 i ) is determined to be 0.3 with reference to the breeding literature of "Livestock Breeding Science", and the economic importance (W i ) is determined to be 0.7 according to the importance of the lambing rate trait in breeding work. According to the formula Calculated as follows: The comprehensive selection index I of Weining Sheep = 0.3×0.3×P1×100 / 70×(0.3×0.3 + 0.7×0.3) + 0.7×0.3×P2×100 / 101.2%×(0.3×0.3 + 0.7×0.3) = 0.4286P1 + 69.17P2. When the individual phenotypic value is equal to the flock average, that is, the appearance score is equal to 70 points and the lambing rate is equal to 101.2%, the comprehensive selection index of Weining Sheep is equal to 100; The comprehensive selection index I of Hu Sheep = 0.3×0.3×P1×100 / 70×(0.3×0.3 + 0.7×0.3) + 0.7×0.3×P2×100 / 215%×(0.3×0.3 + 0.7×0.3) = 0.4286P1 + 32.56P2. When the individual phenotypic value is equal to the flock average, that is, the appearance score is equal to 70 points and the lambing rate is equal to 215%, the comprehensive selection index of Hu Sheep is equal to 100; The comprehensive selection index I of Suffolk Sheep = 0.3×0.3×P1×100 / 70×(0.3×0.3 + 0.7×0.3) + 0.7×0.3×P2×100 / 170%×(0.3×0.3 + 0.7×0.3) = 0.4286P1 + 41.18P2. When the individual phenotypic value is equal to the flock average, that is, the appearance score is equal to 70 points and the lambing rate is equal to 170%, the comprehensive selection index of Suffolk Sheep is equal to 100. When identifying Weining Sheep, Hu Sheep, and Suffolk Sheep, select Weining Sheep ewes, Hu Sheep rams, and Suffolk Sheep rams with a comprehensive selection index higher than 100 to form a breeding base group.

[0045] The technical solutions provided by the present invention will be described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0046] Example 1

[0047] A method for cultivating a 32 - 46 count meat - wool dual - purpose sheep breed, comprising the following steps:

[0048] 1) Form a breeding base group of Weining Sheep, Hu Sheep, and Suffolk Sheep

[0049] According to the comprehensive selection index method, the comprehensive selection index of uncorrelated traits was formulated based on the growth and development level and reproductive performance of sheep. When identifying Weining sheep, Hu sheep, and Suffolk sheep, Weining ewe sheep, Hu ram sheep, and Suffolk ram sheep with a comprehensive selection index higher than 100 were selected to form a breeding base group.

[0050] 2) Establish a breeding base group for the female parent of the Huwei F1 hybrid

[0051] Using Weining sheep as the female parent and Hu sheep as the male parent for hybridization, excellent Huwei F1 hybrid ewe sheep were obtained and screened to establish a basic female sheep group for the Huwei F1 hybrid. The blood of Hu sheep and Weining sheep each accounted for 50%, see Figure 2 ;

[0052] 3) Establish a breeding base group for the female parent of the Sahuwei F2 hybrid

[0053] Using the Huwei F1 hybrid as the female parent and Suffolk sheep as the male parent for hybridization, excellent Sahuwei F2 hybrid ewe sheep were obtained and screened to form a basic female sheep group. The Sahuwei F2 hybrid contained Suffolk sheep, Hu sheep, and Weining sheep blood, accounting for 50%, 25%, and 25% respectively.

[0054] 4) Establish a breeding base group for the male and female parents of the Sahuwei F3 hybrid

[0055] Using the Sahuwei F2 hybrid as the female parent and Hu sheep as the male parent, excellent ①-Sahuwei F3 hybrid rams and ewes were obtained and screened. The ①-Sahuwei F3 hybrid contained Suffolk, Hu sheep, and Weining sheep blood, accounting for 25%, 62.5%, and 12.5% respectively.

[0056] Using the Sahuwei F2 hybrid as the female parent and Suffolk sheep as the male parent, excellent ②-Sahuwei F3 hybrid rams and ewes were obtained and screened. The ②-Sahuwei F3 hybrid contained Suffolk, Hu sheep, and Weining sheep blood, accounting for 75%, 12.5%, and 12.5% respectively.

[0057] 5) Establish a breeding core group for the Sahuwei F4 hybrid and inbreeding fixation

[0058] Using the reciprocal crosses of ① - Sahuwei (25% / 62.5% / 12.5%) hybrid F3 generation and ② - Sahuwei (75% / 12.5% / 12.5%) hybrid F3 generation, the excellent Sahuwei hybrid F4 generation male and female parents were obtained and screened, and the breeding core groups of Sahuwei hybrid F4 generation male and female parents were established. The Sahuwei F4 generation breeding core group contains Suffolk, Hu sheep, and Weining sheep blood, accounting for 50%, 37.5%, and 12.5% respectively; aiming at the meat production rate and lambing rate, the Sahuwei hybrid F4 generation male and female parents were screened for inbreeding fixation and in - group breeding to obtain a certain scale of 32 - 46 meat - and - wool dual - purpose sheep new breeds. The present invention expands the individuals of each generation through one or more combined technical means of estrus synchronization, artificial insemination, superovulation, and embryo transfer.

[0059] On June 12, 2022, relevant experts in Bijie City were organized to conduct on - site measurements at Guizhou New Wumeng Company. The growth performance, meat production performance, reproductive performance, and wool - using performance of 32 - 46 meat - and - wool dual - purpose sheep new breeds are shown in Tables 1 - 4 respectively.

[0060] Table 1 Body weight and body size of 32 - 46 meat - and - wool dual - purpose sheep new breeds

[0061]

[0062] Table 2 Dressing percentage and net meat percentage of 32 - 46 meat - and - wool dual - purpose sheep new breeds

[0063]

[0064] Table 3 Reproductive performance of 32 - 46 meat - and - wool dual - purpose sheep new breeds

[0065] Gender Estrus cycle Age at sexual maturity Optimal breeding time Average lambing rate Ram - 10 - 12 months old 12 - 18 months old - Ewe 14 - 21 days 8 - 10 months old 12 - 18 months old 136.92％

[0066] Table 4 Wool - using performance of 32 - 46 meat - and - wool dual - purpose sheep new strains (breeds)

[0067]

[0068] Note: In Table 4, the wool length is the average value of only shearing 3 times within 12 months, and the wool yield is the total amount of only shearing 3 times within 12 months.

[0069] The production performance, meat production performance, reproductive performance, and wool - using performance of the original breed, Weining sheep, are shown in Tables 5 - 8 respectively:

[0070] Table 5 Body size and weight indexes of Weining sheep

[0071]

[0072] Table 6 Meat production performance of Weining sheep

[0073]

[0074] Table 7 Reproductive performance of Weining sheep

[0075] Gender Estrus cycle Age at sexual maturity Optimal breeding time Average lambing rate Ram － 8 - 10 months old 12 - 18 months old － Ewe 14 - 21 days 6 - 8 months old 10 - 12 months old 101.20％

[0076] Table 8 Wool performance table of Weining sheep

[0077]

[0078] Note: In Table 8, the wool length is the average value of only 3 shearing times within 12 months, and the wool yield is the total amount of only 3 shearing times within 12 months.

[0079] Comparing Table 1 with Table 5, Table 2 with Table 6, and Table 3 with Table 7 respectively, it can be seen from the data in the above tables that the newly cultivated meat-wool dual-purpose sheep new breed of 32 - 46 counts has significantly improved in various aspects such as growth performance, meat production performance, and reproductive performance; comparing Table 4 with Table 8, the wool fineness is within 32 - 46 counts, and the difference is not significant, meeting the requirements of the rough wool breed to be cultivated. Among them, the birth weights of male and female lambs increased by 1.97% and 1.29% respectively, the weights of 4-month-old male and female lambs increased by 8.34% and 6.22% respectively, the weights of one-year-old male and female sheep increased by 11.78% and 9.86% respectively, and the weights of adult male and female sheep increased by 13.64% and 17.36% respectively; the slaughter rates of adult male and female sheep increased by 3.39 and 12.61 percentage points respectively, and the slaughter rates of one-year-old male and female sheep increased by 1.84 and 3.65 percentage points respectively; the lambing rate of reproductive ewes increased by more than 35 percentage points. The new breed cultivated by the present invention can well increase production and income for farmers, and reduce the input cost and management cost of farmers, and has high popularization value.

[0080] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for cultivating a wool and meat dual-purpose sheep breed of 32 to 46 counts, characterized in that, It includes the following steps: Cross-breed with Weining sheep as the female parent and Hu sheep as the male parent to obtain the Huwei hybrid F1 generation; Cross-breed with the Huwei hybrid F1 generation as the female parent and Suffolk sheep as the male parent to obtain the Sahuwei hybrid F2 generation; Cross-breed with the Sahuwei hybrid F2 generation as the female parent and Hu sheep as the male parent to obtain ①-Sahuwei hybrid F3 generation; Cross-breed with the Sahuwei hybrid F2 generation as the female parent and Suffolk sheep as the male parent to obtain ②-Sahuwei hybrid F3 generation; Carry out reciprocal crosses on ①-Sahuwei hybrid F3 generation and ②-Sahuwei hybrid F3 generation to obtain the Sahuwei hybrid F4 generation; Screen the male and female parents of the Sahuwei hybrid F4 generation for inbreeding fixation and in-group breeding to obtain 32-46 meat and wool dual-purpose sheep breeds; Screen the Sahuwei hybrid F4 generation with the meat production rate and lambing rate as the goals; Select Weining sheep ewes, Hu sheep rams, and Suffolk sheep rams with a comprehensive selection index higher than 100 to form a breeding base group; The comprehensive selection index calculation formula ; Wi is the economic importance of the trait, h 2 i is the heritability of the trait, Pi is the individual phenotypic value, and `Pi is the average phenotypic value of the individuals in the flock.

2. The cultivation method according to claim 1, characterized in that, In the female parent of the Huwei hybrid F1 generation, the blood components account for 50% of the blood of Hu sheep and Weining sheep respectively.

3. The cultivation method according to claim 1, characterized in that, In the female parent of the Sahuwei hybrid F2 generation, the blood components account for 50%, 25%, and 25% of the blood of Suffolk sheep, Hu sheep, and Weining sheep respectively.

4. The cultivation method according to claim 1, characterized in that, In the ①-Sahuwei hybrid F3 generation, the blood components account for 25%, 62.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

5. The cultivation method according to claim 1, characterized in that, In the ②-Sahuwei hybrid F3 generation, the blood components account for 75%, 12.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

6. The culturing method according to claim 1, wherein In the Sahuwei hybrid F4 generation, the blood components account for 50%, 37.5%, and 12.5% of the blood of Suffolk, Hu sheep, and Weining sheep respectively.

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