Selection Learn more about Selection
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Problems easily overlooked in the process of selecting and retaining reserve pigs
(1) The selection and retention procedure is unreasonable and the selection and retention process is simplified: in some pig farms, the selection and retention process of reserve pigs is very simple, and there is no fixed procedure. Only after the breeding pig knot test is completed, the selection and retention can be simply evaluated, which is easy to cause imbalance in the selection and retention amount of each bloodline and decline in breeding pig production performance. Therefore, the selection and retention of reserve pigs should have a fixed procedure as a basis. Generally, the selection and retention of reserve pigs should go through three processes: primary selection, middle selection and fixed selection. Primary selection refers to the selection group with 4 times the number of reserved seeds when the farrowing segment is transferred to the breeding segment; middle selection refers to the development from young breeding to fattening.
2019-01-16 -
2006 famous products of eight Jianlan in China
The petal of dwarf species native to Meizhou
2018-02-28 -
Selection and selection of white raccoon dog
At present, the coat color of the white raccoon dog type in China has been very stable, that is, the part of the white hair is white regardless of the needle hair and the villi are all white, and there is no other miscellaneous color (such as the needle hair is white and the villi is not white or part of the body is not white, etc.). Therefore, the selection of white raccoon dogs should focus on coat color, fur quality and body shape, especially male raccoon dogs. The selection of white raccoon dogs should be mated with wild-type raccoon dogs, but not among white raccoon dogs. White raccoon dogs generally have the disadvantage of thick and long needle hair, and the selected wild raccoon dogs had better have short and dense needle hair in order to correct the shortcomings of white raccoon dogs.
2019-01-15 -
The latest course of Maize breeding techniques and methods
Seeds are the most important means of production, and new varieties are the core foundation of agricultural scientific and technological progress. Maize breeding and production practice show that 43% to 60% of the increase in maize yield is achieved through excellent varieties and their popularization. therefore, it is important to cultivate and popularize new maize varieties.
2020-11-10 The latest corn breeding techniques methods tutorials seeds are -
Selection of juvenile fish and management methods of adult fish in brocade carp culture
1. Selection of juvenile fish after hatching, the larvae are raised for 20 to 30 days, and when the fish grows to about 3 cm, they begin to select, eliminate the inferior and retain the good, and strengthen the growth rate, so as to achieve the purpose of protecting the characters. The selection of juvenile fish is the most important to obtain high quality koi in the process of breeding.
2020-11-08 Culture koi juvenile selection and adult fish breeding management -
Bonsai material selection
The selection of tree bonsai material mainly refers to the selection of tree species and pile appearance. The choice of tree species should not only consider the factors suitable for making bonsai, but also fully consider the aesthetic interest and personal hobby of the producer or appreciator (consumer). Because everyone has different levels of education, appreciation habits, and aesthetics, some like pine and cypress trees that are evergreen all the year round, some prefer deciduous trees that are rich in seasonal changes, and some prefer colorful flower and fruit trees. Therefore, the selection of bonsai tree species must first be people-oriented.
2019-01-16 -
Technical methods of seed selection and retention of Lotus Root
(1) selection and breeding. The selection and breeding of lotus root mainly includes asexual seed selection and sexual cross breeding. 1. Asexual selection. China is rich in lotus root germplasm resources, which provides good conditions for asexual selection. In recent years, varieties selected from superior clones include Kexuan 1, Elian 1 and Zhejiang Lake.
2018-09-13 -
Four key points of selection and retention Management of improved breeding Chicken
First, if there is a good flock of chickens without reasonable selection and misbreeding, then the offspring will not be good. Therefore, one particularly excellent rooster is selected for every 810 hens in the same breed, and has a unique
2020-11-08 Good breeder of selection and retention management four main points one combination quantity -
Selection and purchase method of improved Peanut varieties in Peanut High-yield planting techniques, selection of Peanut varieties in three aspects
We should all know the peanut planting method, what is the selection and purchase method of peanut varieties with high-yield peanut planting techniques? Let's have a look! 1. Select varieties according to planting patterns. Generally speaking, peanut seeds sold in current seed stores
2019-06-24 Peanut high yield planting technology improved variety selection method three -
Selection and introduction of Orchid
Selection and introduction of Orchid
2018-05-06 -
Breeding skills of Rabbit selection
Breeding skills of Rabbit selection
2018-07-04 -
Selection and Rational Utilization of Breeding Rams
Selection and Rational Utilization of Breeding Rams
2018-06-30 -
How to distinguish between male and female koi, selection and feeding techniques of juvenile koi
The selection of juvenile fish is the most important step to obtain high quality koi in the process of breeding. Generally, 4 times of 3mi selection were carried out within more than 3 months after hatching. The selection time varies with different varieties, the speed of growth and the time of appearance of markings. For example: Showa.
2019-05-21 -
Breeding techniques of improved Tea Variety
There are many methods to select excellent tea varieties, such as systematic selection, cross breeding, artificial breeding, introduction and domestication and so on. (1) systematic seed selection: also known as single plant seed selection. According to the breeding goal, a good single plant is selected from the seed selection materials, and the first single plant is propagated asexually, and compared with the standard species and the original population species, the excellent and good ones are cultivated into new varieties for propagation and promotion. Step: ① primary selection: according to the correlation between seed selection objectives and tea characters, several excellent individual plants were selected in the tea garden, marked and numbered for observation.
2019-01-16 -
Seed selection and seed retention techniques of Lotus Root
Seed selection and seed retention techniques of Lotus Root
2019-02-23 -
Selection and purchase method of meat breeding pigeon
Selection and purchase method of meat breeding pigeon
2018-07-04 -
What are the selection methods of crayfish seedlings when raising shrimps in spring? Watch this 3 o'clock!
As the temperature rises in spring, crayfish farming should be prepared for six consecutive years, and fertilization is also important before breeding. What are the selection methods for crayfish seedlings when raising shrimps in spring? Watch this 3 o'clock! I. Selection of crayfish seedlings
2020-11-11 in spring when raising shrimp small lobster seedlings of selection method there are -
Aspects needing attention in the selection of chicken farm site
To build a chicken farm, we must first consider the problem of site selection, and the site selection must be based on the scale and nature of the farm (commercial broilers, commercial laying hens or breeder chickens, etc.). Whether the site selection is appropriate or not is related to health and epidemic prevention and the growth of chickens.
2020-11-08 Chicken farm site selection need attention aspect construction -
Skills of selecting juvenile fish in brocade carp culture
After hatching, the brocade carp larvae have been raised for about 20 days to a month, and when the fish grow to about 3 cm, they should be selected. The purpose of selection is to eliminate the inferior and retain the superior, to strengthen the growth rate, so as to achieve the effect of protecting genetic traits. Therefore, the selection of juvenile fish is feeding.
2020-11-08 Breeding koi selection juvenile skill hatching -
The seed selection process of masked palm civet artificial Culture
Masked palm civet (scientific name: Paguma larvata taivana English name: Swinhoe) is a kind of precious wild animal of carnivora, feline cat family and beaver genus. The body color is yellowish grayish brown, the body is slightly fat, the neck is thick and short, and it is not easy to distinguish from the body. There are 17 subspecies in China.
2020-11-08 Fruit beaver artificial breeding seed selection process fruit scientific name