CN112956448B - Strain breeding method for improving early egg weight of local special laying hens - Google Patents
Strain breeding method for improving early egg weight of local special laying hens Download PDFInfo
- Publication number
- CN112956448B CN112956448B CN202011612330.8A CN202011612330A CN112956448B CN 112956448 B CN112956448 B CN 112956448B CN 202011612330 A CN202011612330 A CN 202011612330A CN 112956448 B CN112956448 B CN 112956448B
- Authority
- CN
- China
- Prior art keywords
- weeks
- egg weight
- laying hens
- weight
- egg
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009395 breeding Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 claims abstract description 13
- 230000001488 breeding effect Effects 0.000 claims description 13
- 230000004584 weight gain Effects 0.000 claims description 8
- 235000019786 weight gain Nutrition 0.000 claims description 8
- 230000007613 environmental effect Effects 0.000 claims description 7
- 235000016709 nutrition Nutrition 0.000 claims description 7
- 241000219000 Populus Species 0.000 claims description 6
- 230000035764 nutrition Effects 0.000 claims description 6
- 244000144987 brood Species 0.000 claims description 4
- 230000017448 oviposition Effects 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
- 241001070941 Castanea Species 0.000 claims description 3
- 235000014036 Castanea Nutrition 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 2
- 235000013601 eggs Nutrition 0.000 abstract description 142
- 230000036750 egg laying performance Effects 0.000 abstract description 3
- 241000287828 Gallus gallus Species 0.000 description 15
- 230000002068 genetic effect Effects 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 210000003746 feather Anatomy 0.000 description 2
- 230000012447 hatching Effects 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 244000144972 livestock Species 0.000 description 1
- 244000144977 poultry Species 0.000 description 1
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- Zoology (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention relates to a strain breeding method for improving the early egg weight of local special laying hens. The method selects local characteristic laying hens as the breeds, forms the laying hens with excellent egg laying performance by continuously optimizing and selecting the breeds, obviously improves the produced eggs, breeds and strains meeting the market requirements, and has great market application value.
Description
Technical Field
The invention belongs to the technical field of laying hen breeding, and particularly relates to a strain breeding method for improving the early egg weight of local special laying hens.
Technical Field
The egg weight is an important index for measuring the egg laying performance of the laying hen strain, and the heritability is generally about 0.5. The traditional egg weight breeding method is characterized in that the average egg weight of 3 continuous eggs at the age of 43 weeks represents the individual egg weight, and individuals with overlarge or undersize egg weight in a specific proportion are eliminated according to the egg weight breeding target. The method is widely applied to egg product series egg reselection. The research on the egg weight growth rule of a plurality of egg chicken varieties discovers that the egg weight has a relatively fixed growth mode, the egg weight is expressed as a relatively small growth mode at the beginning of production, the egg weight is approximately linearly grown after 6-8 weeks, and the egg weight is slowly increased and gradually approaches the egg weight limit after about 30 weeks. Therefore, the currently and generally adopted method for re-selecting the seeds of the eggs with the age of 43 weeks cannot reflect the speed of the weight increase of the early eggs of the individuals, and the method has great limitation on controlling the weight of the early eggs.
Compared with high-yield laying hens, most of local special laying hen varieties have the defect of slow growth of early egg weight (before egg laying peak). For example, the weight of high-yield laying hens (taking the Hailan laying hens as an example) is 51.2 grams at 20 weeks, 57.5 grams at 25 weeks, 60.9 grams at 30 weeks and 62.7 grams at 43 weeks. Local chicken breeds (such as Rugao yellow chicken) have the egg weight of 30.5 grams at 20 weeks, 41.4 grams at 25 weeks, 43.8 grams at 30 weeks and 45.4 grams at 43 weeks. Both types of eggs gained about 15 grams from the beginning to the later period of production, but the difference was very large. The market consumes 50 g more in the early stage and 15 g in the later stage according to jin of eggs of the high-yield laying hens, and the market has no influence on the sale production. The local chicken breeds have the special characteristics that the weight of eggs laid by the local chicken breeds is only about 25 to 30 grams when the local chicken breeds are laid for 20 weeks, the eggs at the stage are too small, the local chicken breeds are not suitable for breeding and are not beneficial to sale, and the market requirements can be completely met when the weight of eggs laid by the local chicken breeds reaches 45 grams when the local chicken breeds are laid for 43 weeks according to the existing growth rule. How to increase the growth speed of early egg weight and realize ideal egg weight as soon as possible becomes one of the main targets of local special laying hen breeding.
According to the Chinese journal of livestock and poultry genetic resources-poultry journal (published in 2010-12 months by Chinese agriculture publishing Co., ltd.), 83 local egg-type and dual-use type chicken species are identified in China. By 2019, 8 local characteristic laying hens such as new poplar green-shell laying hens, su-bird green-shell laying hens, new poplar black feather laying hens, fengda No. 1 laying hens, guangdong-bird Huang No. 5 laying hens, yufen No. 1 laying hens, xinhua No. 2 laying hens, chestnut garden oil chicken laying hens and the like are bred in China, and a batch of laying hens are bred. Therefore, the research on the breeding method for improving the early egg weight and the cultivation of the variety and the strain with the early egg weight meeting the market demand on the basis are an important work for breeding local special laying hens.
Disclosure of Invention
The invention mainly relates to a strain breeding method for improving the early egg weight of local special laying hens.
The invention aims to provide a strain breeding method for improving the early egg weight of a special laying hen, which increases the early egg weight and the growth speed so as to improve the utilization rate of hatching eggs and commercial egg substitutes. In order to realize the purpose, the invention adopts the following technical scheme:
a strain breeding method for improving the early egg weight of local special laying hens comprises the following steps:
1) Selecting young broods of a core group pedigree of local special laying hens, wearing wing numbers, feeding in a single cage in an egg laying period, and adopting conventional nutrition levels, environmental conditions and feeding management measures for free feeding;
2) Determining average egg weight of individual and family week from the birth of the core group to 43 weeks old, wherein the specific method comprises once per week egg gathering of each hen and weighing total egg weight, weighing total egg weight of the week on the last day of each week and calculating to obtain average egg weight of individual week; performing family week average egg weight statistical calculation through family query;
3) Based on the average egg weight of the family week, selecting two weeks with an interval of more than 4 weeks between 20-26 weeks, drawing by taking the week as a horizontal coordinate and the average egg weight of the family as a vertical coordinate, and eliminating the family with slow weight gain of 30-35%;
4) In the seed remaining families in the step 3), based on the average egg weight of each individual week, selecting two weeks of age with an interval of more than 4 weeks between 20-26 weeks of age, using the families as a unit, using the weeks of age one by one as a horizontal coordinate, using the average egg weight of each individual as a vertical coordinate for mapping, and eliminating 30-35% of individuals with slow weight gain in each family;
5) Sorting the remaining hens in the step 4) according to the average egg weight of the individuals of 43 weeks old in a week, and selecting the breeds according to the egg weight targets of the strain to eliminate the individuals with larger and smaller egg weights in a certain proportion;
6) Selecting a full sibling cock of the breeding hens for breeding;
7) And (5) selecting and matching the male parent and the female parent, establishing a family and carrying out subculture propagation.
Further, in the step 1): selecting 1800 or more than 1800 nestling broods of the core group pedigree of the special laying hens in the determined local, wearing wing numbers, and feeding at least 1600 nestling cages in the laying period.
Further, the weeks of age selected in said steps 3), 4) are 20 and 24, 21 and 25 weeks of age.
Further, 2-3 full-sib cocks of the hens reserved for the seeds are selected in the step 6) and used for the seeds.
Further, in the step 7), a family is constructed by matching according to the male-female ratio of 1.
Further, in the step 1), the local characteristic laying hens are new poplar green shell laying hens, su-fowl green shell laying hens, new poplar black feather laying hens, fengda No. 1 laying hens, guangdong fowl Huang No. 5 laying hens, yufen No. 1 laying hens, xinhua No. 2 laying hens and chestnut garden oil chicken laying hens.
The invention has the advantages that: the method selects local characteristic laying hens as the breeds, forms the laying hens with excellent egg laying performance by continuously optimizing and selecting the breeds, obviously improves the produced eggs, cultivates the varieties and strains meeting the market requirements, and has great market application value.
Detailed Description
A strain breeding method for improving the early egg weight of local special laying hens comprises the following steps:
1. selecting and determining 1800 or more local characteristic laying hen core group pedigree hatching mothers, wearing wing numbers, feeding in a single cage (not less than 1600) in the laying period, and adopting conventional nutrition level, environmental conditions and feeding management measures for free feeding.
2. Average egg weights were determined for individuals from the core group to 43 weeks of age and for the family week. The specific method is that each hen collects eggs once a week and weighs the total weight of the eggs, and the total weight of the eggs laid in the week is weighed in the last day of the week and the average egg weight of the individual week is calculated; and statistically calculating the average egg weight of the family through pedigree query.
3. Based on the average egg weight of the family, two weeks (such as 20 and 24, 21 and 25 weeks) with an interval of 4 weeks or more between 20-26 weeks are selected, and the average egg weight of the family is plotted with the week age as the abscissa and the ordinate. And 30-35% of families with slow weight gain are eliminated.
4. In the seed remaining family in the step (3), based on the average egg weight of the individual in each week, two weeks of age (for example, 20 and 24, 21 and 25 weeks of age) with an interval of more than 4 weeks between 20-26 weeks of age are selected, and the average egg weight of the individual is plotted as the ordinate one by one with the week of age as the abscissa by taking the family as a unit. In each family, 30-35% of individuals with slow weight gain are eliminated.
5. And (4) sorting the reserved hens in the step (4) according to the average egg weight of the individuals of 43 weeks of age in each week, and selecting the breeds according to the egg weight targets of the strain to respectively eliminate the individuals with larger and smaller egg weights in certain proportions (such as 5-15 percent respectively).
6. 2-3 full-sibling cocks of the reseeding hens are selected for reseeding.
7. And (4) selecting and matching according to the male-female ratio of 1.
Example 1
The new strain L3 of the green-shell laying hens is selected, the nutrition level, the environmental condition and the feeding management measures are adopted conventionally, the green-shell laying hens are fed freely, the green-shell laying hens are fed in a single cage in the egg laying period, and the selection of the early egg weight and the growth speed of the hens is improved through the following steps during the subculture pure breeding so as to improve the generation progress of the character.
1. 1800 young chicks of a new L3 core group pedigree of the green-shell laying hen strain are selected, the number of the family is 60, the young chicks wear wing numbers, the young chicks are raised in a single cage in the laying period, and the young chicks are fed freely by conventional nutrition levels, environmental conditions and raising management measures.
2. Average egg weights were determined for individuals from the first birth of the core group to the age of 43 weeks and for the family week. Each hen collects eggs once a week and weighs the total weight of the eggs, and the average egg weight per week of the individual and the average egg weight per week of the family are calculated. A total of 1623 individuals and 60 families were obtained for a week by 43 weeks of age.
3. And drawing by taking the average egg weight data of families of 20 and 24 weeks as a basis and taking the average egg weight of families of weeks of week as an abscissa as an ordinate. This step eliminates 19 slow-weight-gaining families in this stage, involving 520 individuals, 41 remaining families, and 1103 individuals.
4. And (4) in the seed reserving family in the step (3), based on the average egg weight data of the individual weeks of 20 and 24 weeks of age, drawing by taking the family as a unit and the average egg weight of the individual weeks of week of age as an abscissa one by one as an ordinate. In each family, 30-35% of individuals with slow weight gain are eliminated. This step eliminated 415 individuals altogether, and the remaining 688 individuals.
5. The egg weight selection target of the new green-shell layer strain L3 is to basically maintain the egg weight of 43 weeks old and improve the egg weight before 30 weeks old, in the seed-left hens in the step (4), the eggs are sorted according to the average egg weight of the individuals of 43 weeks old, and about 5% of the individuals with larger and smaller egg weight are eliminated by using a head-tail elimination method. The step eliminates 88 individuals in total and reserves 600 individuals.
6. 2-3 full-sibling cocks of the reseeding hens are selected for reseeding.
7. And (4) selecting and matching according to the male-female ratio of 1.
Comparative example 1: (comparison of the genetic improvement of the present Generation with the weight of eggs at 43 weeks and 25 weeks)
1. The average egg weight of the parent population of the generation is counted to be 50.6 g at the age of 43 weeks before selection, and 42.6 g at the age of 25 weeks. If the traditional selection method is adopted, according to the weight of eggs of 43 weeks, each family independently eliminates the individuals with over-large egg weight of 20 percent and over-small egg weight of 20 percent, selects and reserves 600 hen individuals for pure reproduction, and names the hen individuals as P1. The average egg weight of 43 weeks old egg of P1 is counted to be 51.1 g, the average egg weight of 25 weeks old egg is counted to be 43.1 g, the genetic improvement amount of the 43 weeks old egg of the generation is 0.25 (0.5 x 0.5) g, and the genetic improvement amount of the 25 weeks old egg is 0.25 (0.5 x 0.5) g by applying the method. The procedure of example 1 was actually adopted for the selection and reservation in this generation, and the number of the hens actually reserved was still 600, which was named as P2. The average egg weight of 43 weeks old egg of P2 is counted to be 51.2 g, the average egg weight of 25 weeks old egg is counted to be 44.5 g, the genetic improvement amount of 43 weeks old egg weight of the generation is 0.3 (0.6 x 0.5) g, and the genetic improvement amount of 25 weeks old egg weight of the generation is 0.95 (1.9 x 0.5) g. It can be seen that the genetic improvement amount of the 43-week-old egg of the generation is actually increased from 0.25 g to 0.3 g, which is increased by 0.05 g, and the original egg weight is basically maintained; the genetic improvement amount of the 25-week-old eggs is actually increased from 0.25 g to 0.95 g, and is increased by 0.7 g and is increased by 280%.
Example 2
Selecting a Rugao yellow-feather chicken new strain C3, selecting conventional nutritional level, environmental conditions and feeding management measures, freely feeding, feeding in a single cage in an egg producing period, and improving selection of early egg weight and growth speed of hens in successive pure breeding so as to improve the generation progress of the character.
1. Selecting 2000 Rugao yellow chicken new strain C3 core group pedigree young chicks with 60 family lines, wearing wing numbers, feeding in a single cage in an egg producing period, and freely eating according to conventional nutrition level, environmental conditions and feeding management measures.
2. Average egg weights were determined for individuals from the core group to 43 weeks of age and for the family week. Each hen collects eggs once a week and weighs the total weight of the eggs, and the average egg weight per week of the individual and the average egg weight per week of the family are calculated. The week-averaged egg weights of 1812 individuals and the corresponding 60 families were taken for a total of 43 weeks of age.
3. And drawing by taking the average egg weight data of the families of 21 and 25 weeks old as a basis and taking the average egg weight of the families of week old as an abscissa as an ordinate. This step eliminated 17 slow-gaining families at this stage, involving 572 individuals, 43 remaining families, 1220 individuals.
4. In the seed reserving families in the step (3), based on the average egg weight data of individuals of 21 and 25 weeks of age, the average egg weight of the individuals of week of age is used as an abscissa one by one and the family is used as a unit to construct a graph. In each family, 30-35% of individuals with slow weight gain are eliminated. This step eliminated 514 individuals altogether, leaving 706 individuals.
5. The egg weight selection target of the Rugao yellow chicken new line C3 is to maintain the egg weight of 43 weeks old and improve the egg weight before 30 weeks old, in the seed-left hen in the step (4), the individuals with larger egg weight and smaller egg weight are eliminated by about 5 percent respectively according to the average egg weight of the individuals with 43 weeks old and by utilizing an end-to-end elimination method. The step eliminates 106 individuals in total and reserves 600 individuals.
6. Selecting 2-3 full-sibling cocks of the breeding hens for breeding.
7. And (4) selecting and matching according to the male-female ratio of 1.
Comparative example 1: (comparison of the genetic improvement of the present Generation with the weight of eggs at 43 weeks and 25 weeks)
1. The average egg weight of the parent population of the generation is counted to be 45.7 g at the age of 43 weeks before selection, and 33.7 g at the age of 25 weeks. If the traditional selection method is adopted, according to the weight of eggs of 43 weeks, individuals with over-heavy eggs of 20 percent and over-light eggs of 20 percent are independently eliminated from each family, 600 hen individuals are selected and kept for pure reproduction, and the individual is named as P1. The average egg weight of 43 weeks old egg of P1 is counted to be 46.1 g, the average egg weight of 25 weeks old egg is counted to be 34.2 g, the genetic improvement amount of 43 weeks old egg of the generation is 0.2 (0.4 x 0.5) g, and the genetic improvement amount of 25 weeks old egg is 0.25 (0.5 x 0.5) g. The procedure of example 1 was actually adopted for the selection and reservation in this generation, and the number of the hens actually reserved was still 600, which was named as P2. The average egg weight of the eggs aged 43 weeks of P2 is counted to be 46.2 g, the average egg weight of the eggs aged 25 weeks is counted to be 35.2 g, and then the genetic improvement amount of the eggs aged 43 weeks of the generation is 0.25 (0.5 x 0.5) g and the genetic improvement amount of the eggs aged 25 weeks is 0.75 (1.5 x 0.5) g. The genetic improvement amount of the 43-week-old eggs of the generation is actually improved from 0.2 g to 0.25 g, is increased by 0.05 g and is basically maintained unchanged; the genetic improvement amount of 25-week-old eggs is actually increased from 0.25 g to 0.75 g by 0.5 g and is increased by 200%.
Claims (6)
1. A strain breeding method for improving the early egg weight of local special laying hens is characterized by comprising the following steps:
1) Selecting young broods of a core group pedigree of local special laying hens, wearing wing numbers, feeding in a single cage in an egg laying period, and adopting conventional nutrition levels, environmental conditions and feeding management measures for free feeding;
2) Determining average egg weight of individual and family week from the birth of the core group to 43 weeks old, wherein the specific method comprises once per week egg gathering of each hen and weighing total egg weight, weighing total egg weight of the week on the last day of each week and calculating to obtain average egg weight of individual week; performing family week average egg weight statistical calculation through family score query;
3) Based on the average egg weight of the families per week, selecting two weeks between 20-26 weeks with an interval of more than 4 weeks, drawing by taking the weeks as abscissa and the average egg weight of the families as ordinate, and eliminating the families with slow weight gain of 30-35%;
4) In the seed remaining families in the step 3), based on the average egg weight of each individual week, selecting two weeks of age with an interval of more than 4 weeks between 20-26 weeks of age, using the families as a unit, using the weeks of age one by one as a horizontal coordinate, using the average egg weight of each individual as a vertical coordinate for mapping, and eliminating 30-35% of individuals with slow weight gain in each family;
5) In the reserved hen in the step 4), sorting according to the average egg weight of individual weeks of 43 weeks of age, and selecting seeds according to the egg weight of the strain to respectively eliminate individuals with larger and smaller egg weights in a certain proportion;
6) Selecting a full sibling cock of the breeding hens for breeding;
7) Selecting and matching according to the male and female parents, establishing a family and carrying out subculture propagation.
2. The strain breeding method for improving the early egg weight of the local specialty laying hens as claimed in claim 1, wherein in the step 1): selecting over 1800 nestling broods of a core group pedigree of a special laying hen at a determined place, wearing wing numbers, and feeding at least 1600 nestling hens in a single cage at an egg producing period.
3. The strain breeding method for improving the early egg weight of the endemic laying hens according to claim 1, wherein the week-old stages selected in the steps 3) and 4) are 20 and 24, 21 and 25 weeks old.
4. The strain breeding method for improving the early egg weight of the local specialty laying hens as claimed in claim 1, wherein 2-3 full-sib cocks of the reseeding hens are selected for reseeding in the step 6).
5. The strain breeding method for improving the early egg weight of the local characteristic laying hens according to claim 1, wherein in the step 7), a family is constructed by matching the male-female ratio of 1.
6. The strain breeding method for improving the early egg weight of the local special laying hens according to claim 1), wherein in the step 1), the local special laying hens are new poplar green-shell laying hens, su-bird green-shell laying hens, new poplar black-feather laying hens, fengda No. 1 laying hens, guangdong bird No. 5 laying hens, yufen No. 1 laying hens, xinhua No. 2 laying hens and chestnut garden oil laying hens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011612330.8A CN112956448B (en) | 2020-12-31 | 2020-12-31 | Strain breeding method for improving early egg weight of local special laying hens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011612330.8A CN112956448B (en) | 2020-12-31 | 2020-12-31 | Strain breeding method for improving early egg weight of local special laying hens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112956448A CN112956448A (en) | 2021-06-15 |
| CN112956448B true CN112956448B (en) | 2022-11-01 |
Family
ID=76271123
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011612330.8A Active CN112956448B (en) | 2020-12-31 | 2020-12-31 | Strain breeding method for improving early egg weight of local special laying hens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112956448B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113875694A (en) * | 2021-10-19 | 2022-01-04 | 安徽科瑞达禽业有限公司 | Method for producing Huainan spotted-brown chicken complete set line |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103875594B (en) * | 2014-03-21 | 2016-04-06 | 安徽农业大学 | The breeding method of the laying hen strain that a kind of dried eggs content of material is higher |
| CN104604807A (en) * | 2015-01-21 | 2015-05-13 | 广西大学 | Pure line breeding method for increasing local chicken breed egg yield |
| CN108029628B (en) * | 2017-11-30 | 2021-03-26 | 温氏食品集团股份有限公司 | Breeding method capable of improving egg yield of Muscovy ducks |
| CN109197774B (en) * | 2018-10-22 | 2022-03-11 | 荣达禽业股份有限公司 | Method for breeding yellow-feather high-yield laying hen strain |
| CN109496987A (en) * | 2018-12-30 | 2019-03-22 | 江苏省家禽科学研究所 | A kind of selection improving local egg articles system egg number |
| CN110622912A (en) * | 2019-09-06 | 2019-12-31 | 北京市华都峪口禽业有限责任公司 | Seed production method of non-dwarf high-yield small egg laying hen complete set line |
-
2020
- 2020-12-31 CN CN202011612330.8A patent/CN112956448B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112956448A (en) | 2021-06-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108029628B (en) | Breeding method capable of improving egg yield of Muscovy ducks | |
| CN108207790B (en) | Method for improving egg laying performance of breeding hens | |
| US11490602B2 (en) | Breeding method for improving reproductive performance of chicken specialized dam line | |
| CN108029634A (en) | A kind of high regularity is suitable for the producing method for seed of the cold yellow chicken breed system of fresh listing | |
| CN108782440B (en) | Breeding method of black feather type high-yield Muscovy duck | |
| CN103875594B (en) | The breeding method of the laying hen strain that a kind of dried eggs content of material is higher | |
| CN104604807A (en) | Pure line breeding method for increasing local chicken breed egg yield | |
| CN110622912A (en) | Seed production method of non-dwarf high-yield small egg laying hen complete set line | |
| CN104542487B (en) | Method for breeding new strain of chickens with iron feet and yellow speckle feathers | |
| CN105104293B (en) | A kind of black plumage green-shell egg chicken quick seed production method | |
| CN109105338B (en) | Seed production method of red-feather white-shell laying hen complete set line | |
| CN112956448B (en) | Strain breeding method for improving early egg weight of local special laying hens | |
| CN103814864B (en) | A kind of green-egg-shelled duck selection | |
| CN109197774B (en) | Method for breeding yellow-feather high-yield laying hen strain | |
| CN112997962A (en) | Assorted seed production method for Huayu white skin meat pigeon | |
| CN107494415B (en) | Method for breeding new Guangdong yellow chickens | |
| CN103749379B (en) | Produce the layer breed breeding method of high Ovum Gallus domesticus album density egg | |
| CN102369893A (en) | Hybrid selective breeding technique for high-quality, high-yield sea urchins | |
| CN107182901B (en) | Research method based on growth and development rules of local chickens with the largest egg number | |
| CN107251870A (en) | A kind of research method of the laying hen growth-development law most based on egg production | |
| Singh et al. | Significance of body weight as a performance parameter | |
| CN113875697B (en) | Method for rapidly and efficiently breeding local chicken breeds for laying eggs | |
| CN112970669A (en) | Seed production method for protecting and utilizing variety resources of local high-quality broilers | |
| CN113367098B (en) | Breeding method for improving continuous fertilization capability of chicken | |
| CN115119804B (en) | Hybridization improvement method for improving reproductive performance of Miyi short-foot chickens |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |