CN112841127A - Breeding method of high-quality black pigs for harbors - 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
- A01K67/00—Rearing or breeding animals, not otherwise provided for; New or modified breeds of animals
- A01K67/02—Breeding vertebrates
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- Feed For Specific Animals (AREA)
Abstract
The invention belongs to the technical field of breeding of new agricultural breeding pigs and discloses a breeding method of high-quality black pigs for harbors. The method comprises the steps of utilizing a Hanpu Xiahuo pig to mate with a blue pond sow to obtain a first filial generation terminal male parent, and obtaining a second filial generation high-quality black pig breed for Hongkong through selecting and retaining the first filial generation terminal male parent and a Duroc sow after mating. The breeding method improves the meat quality and taste of the black pigs by utilizing the Duroc sows, and the black pigs cultured by the breeding method have the advantages of high temperature resistance, high lean meat percentage, high growth speed, pure and black hair color, bright meat color and clear lines. Meanwhile, the black pig obtained by the breeding method has obvious intramuscular fat content deposition in the later period, and the growth speed of the black pig is further improved and the high content of lean meat percentage is ensured on the basis of overcoming the problems of large abdomen, flat buttocks, shorter limbs, shorter and uneven body shape, more fat meat, low lean meat percentage content and the like of the modern large-length pig breeds.
Description
Technical Field
The invention belongs to the technical field of breeding of new agricultural breeding pigs, and particularly relates to a breeding method of high-quality Hongkong black pigs.
Background
Most of genetic improvement on pigs for years before China mainly focuses on improving growth speed and ketone body lean meat percentage, and the daily gain, feed utilization rate and ketone body lean meat percentage of commercial lean meat pigs are improved to a very high level by long-term breeding in developed countries under standardized feeding conditions, but with the improvement of the performance, the muscle quality tends to become inferior.
Meanwhile, most commercial pigs sold on the market at present are large white pigs, long white pigs and the like, the types of black pigs are few, the varieties of the black pigs are also few, and most of the black pigs belong to endemic black pig breeds.
Black pigs have been domesticated in China for nearly five thousand years, and a dead space with Shunhun ploughing in the mountainous area of south and Ji province and a current Jiyang river basin are important inheritance areas for the livestock breeding in ancient times. The 16 th century written in the compendium of materia medica by Li Shizhen is specially equipped with pig departments of beast department, records different medicinal values of each part of black pigs, and is precious.
The color of the black pork is the best bright red, the meat color score of 24h is 3.17, the pH value is 6.28, the water retention capacity is 73.89%, the intramuscular fat content is 3.48%, the muscle tenderness is 3.66kg (shear value) and other meat indexes are the best long white pig and about gram of external lean pig breeds; four amino acids that play a key role in the flavor of meat: the contents of threonine, alanine, glutamic acid, lysine and cysteine are obviously higher in black pigs than in foreign pig species such as long and white pigs; the content of nucleotide which forms delicious meat together with free amino acid, the content of the hypoxanthine nucleotide of the meat is obviously higher than that of the approximate gram of the pig, and the content of the hypoxanthine nucleotide is 1 to 4 days after slaughtering, thereby ensuring that the meat of the black pig is delicious and has long fresh-keeping time; the total unsaturated fatty acid in the muscle of the black pig is obviously higher than that of the long and white pig, particularly the content of amino acid (cystine) is higher, and the black pig has higher nutrition and health care effect on human body after being eaten; the number of the muscle fibers of the black pig is more than that of the foreign variety, the diameter of the fibers is larger than that of the foreign variety, and the meat quality is tender and the taste is good; the black pork contains abundant iron, protein and vitamins, which are nutrients which are extremely lacked by modern people who advocate diet, and the content of specific cholesterol and fat are lower than those of common pork, and the content of the black pork in the aspect of fat is still much lower. The 'full protein' contained in the black pork can be used for assisting and repairing human tissues, and the black pork can provide balanced and healthy nutrients when being frequently eaten, so that the modern can still obtain minerals, vitamins and proteins during diet, and the health care effect is achieved. Compared with common pork, the advantages of black pork are more easily found, and the advantages are often far better than those of common pork.
China's republic of ChinaThe Hongkong and Australia regions prefer the eating of black pork with small abdomen and high lean meat percentage.
A large number of practices prove that most of the white pigs in China have the characteristics of high growth speed, high feed reward, thin backfat and the like. The endemic black pig has the characteristics of much fat meat, slow growth speed, no coarse feed resistance, no high temperature resistance, poorer meat color and mouthfeel and the like.
Disclosure of Invention
The invention aims to solve the problems that the endemic black pigs have more fat meat, slow growth speed, no coarse feed resistance, no high temperature resistance, poor meat color and taste and the like in the prior art, and the invention aims to provide a breeding method of high-quality black pigs for harbors.
The technical scheme adopted by the invention is as follows: a breeding method of high-quality Hongkong-supply black pigs comprises the steps of selecting Hanpu Xiaha boars and blue pond pig sows to mate to obtain F1 generation breeding boars, selecting and reserving black Hanlan F1 generation breeding boars as male parents to be hybridized with Duroc sows as female parents, and obtaining F2 generation piglets which are the high-quality Hongkong-supply black pigs through production and breeding.
Preferably, the breeding target of the body shape of the black Hanlan F1 generation boar comprises the following steps:
and (3) hair color: the limbs of the F1 generation piglets are all pure black;
body length: when the F1 generation piglets are in sexual maturity, the body length of the sow is not less than 98 cm, and the body length of the boar is not less than 99 cm;
body height: when the F1 generation piglets are in sexual maturity, the heights of the boars and the sows are not less than 56 cm;
chest circumference: when the F1 generation piglets are in sexual maturity, the chest circumference of the boars and sows is not less than 102 cm;
pipe surrounding: when the F1 generation piglets are in sexual maturity, the tube circumference of the boars and the sows is not less than 20 cm;
head type: the head types of F1 generation piglets are unified;
in other aspects: straight back and waist, good firmness of the limbs and hoofs, high tail root, big and round vulva, uniform nipple arrangement, and no blind or volcanic nipple.
Preferably, the breeding target of the breeding character of the F1 generation piglet comprises the following steps:
effective nipple logarithm: the effective nipple number of F1 generation piglets is not less than 7 pairs;
average litter size: the average litter size of F1 generation piglets is 9.5;
average litter size: the average litter size of the F1 piglet is 9.
Preferably, the breeding target of the growth rate of the F1 generation piglets comprises the following steps:
growth and development weight: the weight of the patient is 100kg in 6 months;
average daily gain of growth and development: the average daily gain of the fattening pig is not less than 700 g/day under the condition of 25-100 kg;
growth and development feed conversion ratio: the weight of the fattening pig is 25-100 kg, and the feed meat ratio (FCR) is not more than 3.0.
Preferably, the breeding target of the ketone body character of the F1 generation piglets comprises the following steps:
weight: body weight 130 kg; the thickness of the backfat is 2.5-3 cm; the dressing percentage is not less than 72 percent; the lean meat percentage is 58-62%; the number of ribs is not less than 15.
Preferably, the breeding target of the meat quality trait of the F1 generation piglets comprises the following steps:
the average flesh color score is not less than 3.0 +/-2.5-3.0 +/-5.0;
the marbling score is not less than 3.0 +/-2.5-3.0 +/-5.0;
the muscle fat content is more than or equal to 3 percent and less than or equal to 5.0 percent;
the pH value of the muscle after 45 minutes is not less than 6.3; the pH value of the muscle after 24 hours is not less than 5.8;
the average drip loss rate is less than or equal to 2.0 percent.
Preferably, the breeding target of the Duroc sow comprises the following steps:
the body shape and appearance are as follows: the growth and development are good, more than 7 pairs of effective teats are arranged, the symmetrical and even distribution is realized, and the reproductive development is good;
backfat thickness: measuring the back fat at the position between the 3 rd to 4 th intercostals and 5 cm away from the back midline, wherein the weight reaches 100kg, and the thickness of the back fat is 9-11 cm;
reproductive performance: the total number born is more than 9.5, the number born alive is more than 9, and the weight of the newborn piglets is not less than 1.5 kg;
growth and fertility performances: the weight is not less than 100kg, and the age per day is 155-160 days.
Preferably, the selection target for obtaining F2 generation piglets by the production culture comprises the following steps:
weight: the difference between the weights of the F2 generation piglets with the maximum weight and the F2 generation piglets with the minimum weight is not more than 5 kg; the weight is controlled at 100-115 kg;
body type: the belly is small, the waist and the back are straight, and the body is uniform;
defective pigs are removed;
the boar selection and remaining rate is not more than 10 percent, and the sow selection and remaining rate is not more than 25 percent.
Preferably, the black Hanlan F1 generation boars are testicular-deficient and are selected for culling.
Preferably, the Duroc female genitals are too small to be selected for elimination.
The judgment mode for the excessively small vulva of the selected sow belongs to the conventional knowledge of professional technicians in the field, so that the judgment can be completed without specific data.
The invention has the beneficial effects that:
the invention provides a breeding method of high-quality black pigs for port supply, which is characterized in that a first filial generation terminal male parent is obtained by utilizing the mating of Hanpu Xiahu pigs and blue pond sows, and a second filial generation high-quality black pig variety for port supply is obtained by selecting and reserving the first filial generation terminal male parent and Duroc sows after mating. The breeding method improves the meat quality and taste of the black pigs by utilizing the Duroc sows, and the black pigs cultured by the breeding method have the advantages of high temperature resistance, high lean meat percentage, high growth speed, pure and black hair color, bright meat color and clear lines. Meanwhile, the black pig obtained by the breeding method has obvious intramuscular fat content deposition in the later period, and the growth speed of the black pig is further improved and the high content of lean meat percentage is ensured on the basis of overcoming the problems of large abdomen, flat buttocks, shorter limbs, shorter and uneven body shape, more fat meat, low lean meat percentage content and the like of the modern large-length pig breeds.
Drawings
FIG. 1 is a schematic view of an embodiment of breeding the high-quality Hongkong-providing black pig.
Detailed Description
The present invention is further illustrated below with reference to specific examples. It will be appreciated by those skilled in the art that the following examples, which are set forth to illustrate the present invention, are intended to be part of the present invention, but not to be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples were carried out under the conventional conditions, unless otherwise specified. The reagents used are all conventional products which are commercially available.
Example (b):
FIG. 1 shows the breeding process in the practical operation of the breeding example of the good Hongkong-supplying black pig
A breeding method of F1 generation boars (black pigs) comprises the following steps:
1. measurement of the Scale
More than 150 boars are measured each year (more than 10 boars are measured per blood), 13 boars are selected and retained, and 10 boars are updated (50% update); more than 2000 sows are tested, 500 sows are selected and retained, and 400 sows are renewed (40% renewal).
2. Determination of pig litter
Selecting and reserving a delivery room: the ear number of the newborn piglet is 1 male and 2 female per nest;
and (3) breeding the male piglets: selecting 3 best piglets one day before castration every week, cutting the rest piglets as pork pigs, and hanging ear cards before weaning
And (3) piglet breeding: before weaning every week, selecting the best 40 hangers, and making the rest pork pigs;
nursing and selecting: during the conservation period, the pigs with abnormal growth are eliminated, and all pigs enter a measuring house after the conservation is finished;
thirdly, final measurement and selection: after the final test is finished, selecting and reserving boars and sows for replacement according to the index sequencing and the appearance characteristics; 10% before boar selection; 25% before sow selection.
3. Determination of traits and data recording
The method comprises the following steps: recording the semen source, the hybridization time, the delivery time, the total number born and the number born alive of the breeding boar;
② piglet: recording ear number, birth date, sex, parent information, birth weight, number of teats and weaning weight;
③ spare boars: after the nursing is finished, measuring, and recording the measured body weight, the daily gain of 30-90Kg, the feed-meat ratio, the age of 90Kg day, 90Kg backfat and the eye muscle area; measuring indexes of intramuscular fat and slaughter meat of the living body;
fourthly, replacement gilts: after the nursing is finished, measuring to reach 90Kg day age, 90Kg backfat and eye muscle area; and (4) measuring indexes of the intramuscular fat and the slaughter meat of the living body.
4. Genetic evaluation and molecular marker assisted selection
Detecting a marker gene: collecting the tissue sample of the primarily selected piglet tail with each ear number, detecting the common markers of hair color, growth speed, carcass character and meat quality character, detecting genes: hair color (MC1R, ASIP, TYRP1), reproduction (ESR), meat quality related genes; the detection method comprises the following steps: PCR-RFLP. According to the detection result, an independent elimination scheme is provided for breeding;
genetic evaluation:
detecting partial pigs by using a whole genome SNP chip, estimating gEBV by using a GBLUP method, and calculating a selection index;
secondly, according to the detection result of the marker gene, an independent elimination method is adopted for part of the markers;
thirdly, independently eliminating the boars with testicular defects; for the excessively small vulva of the sow, independent elimination is adopted;
and fourthly, selecting and reserving the reserve pigs according to the indexes according to the size of the group, wherein the stock reserving rate of the boars is not more than 10 percent, and the stock reserving rate of the sows is not more than 25 percent, and the reserve pigs are used for supplementing the core group.
5. Mating scheme
And (4) arranging breeding of the excellent replacement breeding male sows reserved by the screening in a random mating mode under the condition of strictly controlling within 3 generations without close relatives.
6. Feeding management
1. Transition of the feed: after the conservation is finished, 30kg of company conservation material is used, 30kg to 60kg of growth material is fed, the average weight of the cage reaches 60kg to 90kg, then the breeding fertilizer is fed, the flax seed oil and the microecological preparation are added according to the test feed formula in the fattening period of the black pig to protect and benefit, and the muscle quality of the black pig is improved.
The dry powder and the trough are adopted for free ingestion, the dry powder is fed for more than 2 times per day, the trough is kept full of dry food as much as possible, the feed is not limited in quantity, a water fountain can drink water freely, and the small stadium can exercise freely. The training work is done in a pre-test, and the interior of the fence is kept clean.
The feed is strictly prohibited from being wasted, and the polluted feed must be recycled and weighed every day.
Closely matching with veterinarians, enhancing disease prevention and treatment, performing immunization according to required procedures, checking the disease condition and treating record in time, and weighing and gathering materials for pigs which have not returned or sudden death pigs and have the disease course of more than three days to eliminate.
7. Health care and immunization program
And (3) health care planning: during the pre-test period, the piglet scabbing, pediculizing, insect expelling and teaching tasks are completed, and the stress is reduced as much as possible. After 6 days of age to about two weeks before and after the rotation of the stall, the electrolytic multivitamins are added into the feed for 7 days at a concentration of 200 g/t. 150g/t of amoxicillin, 2kg/t of aureomycin and 125g/t of prothioconazole are added at the body weight stage of 30-40 kg. The remaining administration plans are scheduled according to the field administration plan.
Immunization program: pseudorabies, swine fever, Japanese encephalitis and tiny vaccines are completed in sequence before weaning.
Injecting the hog cholera vaccine into the piglet at the age of 60 days. Antigen or antibody monitoring is scheduled according to a field plan.
Secondly, a method for breeding Duroc sows comprises the following steps:
1. selection target
(1) Growth and fertility performances: the weight of the fish reaches 100kg for 155 days and 160 days.
(2) Backfat thickness (reciprocal 3-4 intercostals, 5 cm from back center line): the back fat thickness of 100Kg body weight is 9-11 mm.
(3) Reproductive performance: the total number born is more than 9.5, and the number born alive is more than 9. The individual weight of the newborn piglet is more than 1.5 kg.
(4) The appearance of the body shape is as follows: the product meets the appearance standard of the product, has good growth and development, has more than 7 pairs of effective teats, is symmetrical and evenly distributed, and has good reproductive development of male and female pigs.
2. Breeding method
According to the requirements of core group pedigrees, families with poor production performance and genetic defects are eliminated, new pedigrees are supplemented timely, and a semi-open type successive transfer breeding scheme is basically adopted.
3. Core group establishment
The Duroc basic sow has 80-120 pigs and 4-6 male breeding pigs.
4. Core group seed selection principle
(1) The selected core group should have obvious variety characteristic characteristics and genetic basis for achieving breeding targets, and has no genetic defects.
(2) The selected core group individuals have strong constitution and clear blood system, and the blood relationship quantity meets the requirements of a breeding scheme.
5. Principle of matching
(1) Basically follows the non-genetic matching principle, and the genetic coefficient with matched boars and sows is controlled below 0.03.
(2) For particularly excellent boars and sows, moderate genetic matching is allowed, and the genetic coefficient is controlled below 0.125. However, when the genetic matching of the boar is carried out, the boar and other sows should be subjected to non-genetic matching so as to prevent the genetic matching from failing and losing the good genes.
6. Selection of stages
Selection of weaning stage
(1) Selecting and reserving breeding boars: it must be ensured that offspring of boars and sows with high selection indices and offspring of major descent are not castrated. 1-2 days before castration of the boar, a workshop principal notifies a boar breeding responsible person, breeding personnel select and reserve 2-3 boars per litter according to the development conditions of newborn individual weight, self growth and development, physical appearance, reproduction, nipple and the like of the same litter of the boar, mark the boars, castrate and fatten the boars which can not be used, and reserve the boars for sale. And (4) carrying out blood margin analysis on individuals with malformation and impairment symptoms in the same fossa to judge whether the individuals are the defect, and if the individuals are not the defect, reserving seeds from the fossa.
(2) Selecting and remaining the breeding sows: and (3) selecting and reserving 3-4 sows per litter before 23d weaning according to the selection and reservation standard of the boars, marking, and transferring the sows and the selected and reserved boars to a boar breeding base for separate breeding during weaning.
Selection of incubation period
When the piglet is at the age of 70 days, breeding personnel select 1 male and 2 female pigs per litter for participating in performance determination according to the breeding scheme requirements of the company and the grade standard of the boars on the basis of primary selection.
(3) Selection of replacement boar and sow
When the weight of the pig is measured to reach 85-115kg, the growth performance, the measurement of the back fat of the living body and the appearance evaluation are carried out. And (4) utilizing GBS software to estimate breeding values, and selecting and reserving replacement boars and sows according to index sequencing and appearance evaluation. In order to accelerate generation replacement, the most elegant individuals are used for substitution in principle, and the blood relationship is considered, so that the boar index is more than 120 and the maternal index is more than 110. The boars which can not be selected are sold by boars, and the sows which can not be selected in the core group are sold.
7. Selecting and remaining proportion
According to the product blood and breeding target, the selection intensity is increased, the genetic progress is accelerated, the selection and retention proportion of core group boars is controlled within 5%, and the sow is controlled within 20%. The renewal rate of the core group boars is more than 50%.
The invention provides a breeding method of high-quality black pigs for port supply, which is characterized in that a first filial generation terminal male parent is obtained by utilizing the mating of Hanpu Xiahu pigs and blue pond sows, and a second filial generation high-quality black pig variety for port supply is obtained by selecting and reserving the first filial generation terminal male parent and Duroc sows after mating. The breeding method improves the meat quality and taste of the black pigs by utilizing the Duroc sows, and the black pigs cultured by the breeding method have the advantages of high temperature resistance, high lean meat percentage, high growth speed, pure and black hair color, bright meat color and clear lines. Meanwhile, the black pig obtained by the breeding method has obvious intramuscular fat content deposition in the later period, and the growth speed of the black pig is further improved and the high content of lean meat percentage is ensured on the basis of overcoming the problems of large abdomen, flat buttocks, shorter limbs, shorter and uneven body shape, more fat meat, low lean meat percentage content and the like of the modern large-length pig breeds.
While particular embodiments of the present invention have been illustrated and described, it will be appreciated that the present invention is not limited to the above-described alternative embodiments, and that various other forms of product may be devised by anyone in light of the present invention. The foregoing detailed description should not be construed as limiting the scope of the invention, and it will be understood by those skilled in the art that modifications may be made to the technical solutions described in the foregoing embodiments, or that equivalent substitutions may be made to some or all of the technical features thereof, without departing from the spirit and scope of the invention, and that these modifications or substitutions may not substantially depart from the essence of the corresponding technical solutions.
Claims (10)
1. A breeding method of high-quality Hongkong-supply black pigs is characterized by comprising the steps of selecting Hanpu Xiaha boars and blue pond pig sows to mate to obtain F1 generation breeding boars, selecting and reserving black Hanlan F1 generation breeding boars as male parents to be hybridized with Duroc sows as female parents, and obtaining F2 generation piglets which are high-quality Hongkong-supply black pigs through production and breeding.
2. The breeding method of high-quality Hongkong-supplying black pigs as claimed in claim 1, wherein the breeding goal of the body shape and appearance of the black Hanlan F1 generation boar comprises:
and (3) hair color: the limbs of the F2 generation piglets are all pure black;
body length: when the F2 generation piglets are in sexual maturity, the body length of the sow is not less than 98 cm, and the body length of the boar is not less than 99 cm;
body height: when the F2 generation piglets are in sexual maturity, the heights of the boars and the sows are not less than 56 cm;
chest circumference: when the F2 generation piglets are in sexual maturity, the chest circumference of the boars and sows is not less than 102 cm;
pipe surrounding: when the F2 generation piglets are in sexual maturity, the tube circumference of the boars and the sows is not less than 20 cm;
head type: the head types of F2 generation piglets are unified;
in other aspects: straight back and waist, good firmness of the limbs and hoofs, high tail root, big and round vulva, uniform nipple arrangement, and no blind or volcanic nipple.
3. The breeding method of the good Hongkong-supplying black pig as claimed in claim 2, wherein the breeding target of the breeding character of the F2 generation piglet comprises:
effective nipple logarithm: the effective nipple number of F2 generation piglets is not less than 7 pairs;
average litter size: the average litter size of F2 generation piglets is 9.5;
average litter size: the average litter size of the F2 piglet is 9.
4. The breeding method of high-quality Hongkong-supplying black pigs as claimed in claim 3, wherein the breeding target of the growth rate of F2 generation piglets comprises:
growth and development weight: the weight of the patient is 100kg in 6 months;
average daily gain of growth and development: the average daily gain of the fattening pig is not less than 700 g/day under the condition of 25-100 kg;
growth and development feed conversion ratio: the weight of the fattening pig is 25-100 kg, and the feed meat ratio (FCR) is not more than 3.0.
5. The breeding method of high-quality Hongkong-supplying black pigs as claimed in claim 4, wherein the breeding goal of the ketone body character of F2 generation piglets comprises:
weight: body weight 130 kg; the thickness of the backfat is 2.5-3 cm; the dressing percentage is not less than 72 percent; the lean meat percentage is 58-62%; the number of ribs is not less than 15.
6. The breeding method of high-quality Hongkong-supplying black pigs as claimed in claim 5, wherein the breeding goal of the meat quality character of F2 generation piglets comprises:
the average flesh color score is not less than 3.0 +/-2.5-3.0 +/-5.0;
the marbling score is not less than 3.0 +/-2.5-3.0 +/-5.0;
the muscle fat content is more than or equal to 3 percent and less than or equal to 5.0 percent;
the pH value of the muscle after 45 minutes is not less than 6.3; the pH value of the muscle after 24 hours is not less than 5.8;
the average drip loss rate is less than or equal to 2.0 percent.
7. The breeding method of high-quality black pigs for harbors as claimed in claim 1, wherein the breeding goal of Duroc sows comprises:
the body shape and appearance are as follows: the growth and development are good, more than 7 pairs of effective teats are arranged, the symmetrical and even distribution is realized, and the reproductive development is good;
backfat thickness: measuring the back fat at the position between the 3 rd to 4 th intercostals and 5 cm away from the back midline, wherein the weight reaches 100kg, and the thickness of the back fat is 9-11 cm;
reproductive performance: the total number born is more than 9.5, the number born alive is more than 9, and the weight of the newborn piglets is not less than 1.5 kg;
growth and fertility performances: the weight is not less than 100kg, and the age per day is 155-160 days.
8. The breeding method of high-quality Hongkong-supplying black pigs as claimed in claim 1, wherein the breeding goal of producing and breeding F2 piglets includes:
weight: the difference between the weights of the F2 generation piglets with the maximum weight and the F2 generation piglets with the minimum weight is not more than 5 kg; the weight is controlled at 100-115 kg;
body type: the belly is small, the waist and the back are straight, and the body is uniform;
defective pigs are removed;
the boar selection and remaining rate is not more than 10 percent, and the sow selection and remaining rate is not more than 25 percent.
9. The breeding method of high-quality Hongkong-supplying black pigs as claimed in claim 1, wherein said black Hanlan F1 generation boars are testis-deficient and are selected for elimination.
10. The breeding method of high-quality black pigs for harbors as claimed in claim 1, wherein the Duroc sows are too small in vulva and are selected to be eliminated.
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