selectivity Learn more about selectivity
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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 -
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 -
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 -
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 -
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 -
Bonsai must be selected in advance and carefully designed for stone selection and processing according to the theme.
Bonsai must be selected in advance, and carefully designed, according to the theme of stone selection, processing bonsai.
2018-05-04 -
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 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 -
The latest peanut market in Liaoning on December 23, 2015. Live pigs today.
Peanut price in Jinzhou area: peanut price in Beizhen City, Liaoning Province: peanut market price in Beizhen Town, Jinzhou, Liaoning Province is stable. Tangyou rice charges 4.50 yuan / jin, 6 sieves color selected refined rice 4.70 yuan / jin, price based on quality, white sand rice 4.20 yuan / jin, 6 sieves color selected milled rice
2015-12-26 December 23 2015 Liaoning region Peanut latest Jinzhou -
How to select cauliflower in planting
How to select cauliflower in planting
2019-10-11 -
Methods and techniques of wheat seed selection
Methods and techniques of wheat seed selection
2019-09-04 -
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 -
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 -
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 -
Breeding skills of Rabbit selection
Breeding skills of Rabbit selection
2018-07-04 -
How to select the young koi?
How to select the young koi?
2018-07-23 -
The latest price of peanuts in Jilin area on December 24, 2015. Live pigs today.
Songyuan area peanut quotation: Jilin Songyuan Fuyu Sanjingzi peanut price: Jilin Fuyu Sanjingzi four red fruits yield about 3.3-3.4 yuan, partial quality about 3.0 yuan, hand-selected first-class fruit 4.1-4.2 yuan, individual quotation is high, second-class fruit about 3.9-4.0 yuan; four red
2015-12-26 2015 December 24 Jilin region Peanut latest Pine -
Selection and introduction of Orchid
Selection and introduction of Orchid
2018-05-06 -
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