selection and retention Learn more about selection and retention
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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 -
Selection and retention of reserve sows by stages
Selection and retention of reserve sows by stages
2018-07-23 -
Wheat seed retention relationship how to do a good job of wheat seed retention in next year's harvest
Wheat seed retention relationship how to do a good job of wheat seed retention in next year's harvest
2018-07-14 -
Seed selection and seed retention techniques of Lotus Root
Seed selection and seed retention techniques of Lotus Root
2019-02-23 -
The latest course of technical methods for seed selection and retention of lotus root
Lotus root is a vegetable crop of Nymphaeaceae, which is loved by many people in our country. Lotus root is rich in nutrients, which can not only be fried, but also eaten raw. And the non-staple food and all kinds of snacks processed by lotus root are very popular. Now lotus
2020-11-10 Latest lotus root seed selection seed retention techniques methods tutorials -
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 -
The method of selection, retention and matching of breed raccoon dogs
Selection and selection of raccoon dogs through breeding and breeding for one year, the breeding ability of all male raccoons and the estrus, parturition, motherhood and milk secretion of females have been mastered. At the same time, because postpartum raccoon dogs generally have the highest litter size in the second to fourth years, all male and female raccoon dogs are selected according to the records before the skin is removed in the first year, and excellent raccoon dogs are gradually bred. The male raccoon dog reserved for breeding should be tall and long, strong hind legs, wide chest, long waist and straight back, long and fluffy tail, and testicles.
2019-01-16 -
Selection, retention and storage of sweet potato species
Timely harvest sweet potato harvest is too early, the yield is low; too late harvest, easy to suffer from freezing, affecting storage. Therefore, it is generally best to start harvesting when the temperature is about 18 ℃, and finish harvesting when the temperature is above 10 ℃ (that is, before the dry frost period). Spring melon fields for dry use are usually harvested first.
2020-11-08 Seed sweet potato seed selection retention storage timely harvest -
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 -
Selection of plant materials for the special topic of orchid cultivation
Plant material is one of the food of orchids, is the basis of orchid cultivation, with good planting material, orchid cultivation is more than half of the success, the importance of planting material is self-evident. The orchid is right.
2018-04-02 -
Timely harvesting and seed retention skills of planting Peanut
Mastering the suitable harvest time of peanut is very important to improve the yield and quality of peanut. While harvesting peanuts, we should pay attention to selecting and keeping good seeds to ensure high peanut yields in the coming year. The suitable harvest time and seed retention techniques of peanuts are introduced as follows: first, timely.
2020-11-08 Planting flowers raw timely harvesting and leaving seeds skills mastery good flowers -
What are the seed retention techniques of towel gourd in greenhouse? How to operate it exactly?
Nowadays, many growers choose to grow towel gourd in greenhouse, and when planting towel gourd in greenhouse, keeping seeds is an important foundation to grow towel gourd well. So what are the seed retention techniques of towel gourd in the greenhouse? How to operate it exactly? 1. Strictly screen the plants that remain and keep the seeds.
2020-11-09 Greenhouse towel gourd seed retention technology what specific how operation -
Scientific seed retention measures of lettuce
Lettuce, also known as lettuce, Asteraceae lettuce species can form a variety of fleshy tender stems, herbaceous plants in 2012. Alias stem lettuce, lettuce bamboo shoots, green shoots, lettuce. Delivery period: from January to April. It is native to Central or North China. The aboveground stem is edible and the stem bark is white and green.
2020-11-08 Lettuce science seed retention measures lettuce also known as lettuce Compositae -
Raise orchids occasionally-talk about plant materials
Raise orchids occasionally-talk about plant materials
2018-04-27 -
Seed retention method of towel gourd
Seed retention method of towel gourd
2019-06-11 -
Site selection, cultivation and seed retention of Asarum
Asarum prefers a cool, moist environment, avoiding bright light and drought. The soil should be loose, fertile and rich in organic matter. So how to select and cultivate Asarum and keep its seeds? Generally, the seeds are sown at the beginning of July and the seeds are cracked at the beginning of August, and the radicles are exposed in the middle of August, which can reach 4 cm in early September.
2020-11-08 Asarum site selection cultivation and seed retention Xi cool -
Seed retention technique of water celery
Water celery adopts asexual reproduction, and the stem is its breeding material. In water cropping, seeds and plants were selected in late November, and the seed selection criteria were as follows: good characteristics of the remaining varieties, moderate plant height, stout stem, short internodes, more and strong axillary buds, developed root system, no insect and no disease. The selected plants were then transferred to the reserved field. To keep farming, you should choose a place where it is leeward and sunny and where drainage and irrigation are convenient. Fine soil preparation and thick application of base fertilizer were carried out in the middle of October. When planting plants, keep 1 cm water layer in the field, and the spacing between rows and plants is 25 cm.
2019-01-16 -
Seed retention skills of garlic
Seed retention skills of garlic
2020-02-24 -
Said that the plant material orchid
Plant material is one of the food of orchids, is the basis of orchid cultivation, with good planting material, orchid cultivation is more than half of the success, the importance of planting material is self-evident. Orchid people attach great importance to and pay close attention to plant materials, and the evaluation of plant materials is different. It can be said that it is reasonable and reasonable.
2018-03-01 -
The old three kinds of potted orchids were watered once every few days.
The old three kinds of potted orchids were watered once every few days.
2020-04-28