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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 -
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 -
Selection and Construction techniques of Garden Flower Border plants
Garden flower border plant selection and construction technology 1 Analysis of the characteristics and types of garden flower border is mainly a form of flower application that simulates the growth of plants in nature.
2018-06-23 -
Seven bases for High yield selection of Spring sowing Maize
When sowing, apply compound fertilizer 30ml / mu 40kg, fertilizer should be applied between two rows or two plants of corn, the depth is more than 10cm, cover the soil after application. At the 3-leaf stage, light dung water can be irrigated once, 1500Mu and 2000kg per mu. After fixing seedlings at the 5-leaf stage, look at the amount of base fertilizer and the growth of corn.
2018-09-10 -
We should pay attention to the selection of spring sowing corn.
How to select good maize varieties is a key issue related to whether the yield can be increased in autumn. When selecting improved varieties of corn, farmers should follow the following principles: first, seed selection according to the conditions of heat resources. The local heat resources are related to the growing period of maize varieties. The corn variety with long growing period has good yield performance.
2018-09-12 -
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 -
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 -
How to select sorghum seeds? What are the breeding methods?
From the perspective of grain crops, most of our friends in most areas may know wheat and rice better, but sorghum rice can also be used as food. Before planting sorghum, you need to select the seeds first. Let's learn them together. 1. How to select sorghum seeds?（
2020-11-27 sorghum seeds how seed selection have which seedling method from -
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 -
Selection and introduction of Orchid
Selection and introduction of Orchid
2018-05-06 -
Methods and techniques of wheat seed selection
Methods and techniques of wheat seed selection
2019-09-04 -
Breeding skills of Rabbit selection
Breeding skills of Rabbit selection
2018-07-04 -
The Latest Methods and Techniques of Wheat Seed Selection
Wheat is one of the main food crops in our country. After autumn harvest, it is time to cultivate wheat for one year. Now it is time to choose wheat varieties. There are many varieties of wheat. How to select wheat seeds correctly? Let's take a look at it with Xiaobian
2020-11-10 latest wheat seed selection methods and techniques yes china -
How to select yew seeds? What are the methods of raising seedlings?
Taxus chinensis, also known as yew, is a first-class protected plant in China, known as "tree giant panda", its main value lies in strong ornamental and good medicinal use. At present, Taxus is in an endangered state, so the cultivation of Taxus is very important.
2020-11-27 Taxus seed how seed selection seedling method have which -
How to choose a good breed for raising minks and what matters needing attention?
What is the seed selection? Seed selection is to select good individuals for seed use and eliminate bad individuals at the same time. How to choose a good seed? 1. Choose a good variety. A good breed is the basis for improving the litter birth rate and survival rate of minks. When introducing a variety, it must be taken into account.
2020-11-08 Raise mink how choose species yes what matters needing attention -
What problems should be paid attention to when selecting maize seed varieties?
What problems should be paid attention to when selecting maize seed varieties?
2018-07-01 -
Population selection should be paid attention to in efficient goose breeding.
Population is the abbreviation of a species group such as group, strain, variety or genus. Population selection is based on the fact that both parties belong to the same or different populations. Population selection can be divided into two categories: purebred breeding and cross breeding, while hybrid breeding can
2020-11-08 Population selection yes high efficiency raising geese need attention population -
Suggestions on the Selection and Introduction of Orchid
Carry forward the national orchid culture, spread orchid knowledge orchid selection and introduction is very complex, such as poor seed selection will directly affect your enthusiasm for orchid cultivation; the introduction of inferior grass, fake grass on your economic interests directly damaged. For this reason, in Lan...
2018-09-14 -
High-yield cultivation techniques of Pumpkin seedlings
Selection of varieties: local seedlings with sturdy and long melons should be selected. To treat the seeds: soak the seeds in warm water of 50 ℃ after drying for 2 days, soak them for about 10 hours after cooling, and then place them at room temperature for 30 ℃ to accelerate germination. Site selection: choose good drainage
2020-11-08 Pumpkin seedling high yield cultivation techniques abstract selection varieties should -
What problems should be paid attention to when selecting the latest maize seed varieties?
Good varieties and seeds are the basis of a good harvest, and variety selection is the first step in maize production. There are great differences among varieties in growth period, yield level, disease resistance, drought resistance, disease resistance, lodging resistance and adaptive region. Excellent performance in a region
2020-11-10 The latest selection corn seeds varieties time attention which ones