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What are the easily overlooked problems in the process of selecting and retaining replacement gilts?
(1) The selection and retention procedure is unreasonable, and the selection process is simplified: In some pig farms, the selection and retention process for replacement gilts is very simple, with no fixed procedure. It is only after the breeding pigs finish testing that a simple evaluation is made and they are selected and retained. This can easily lead to an imbalance in the number of animals retained from each bloodline and a decline in the production performance of breeding pigs. Therefore, the selection and retention of replacement gilts must rely on a fixed procedure. Generally, the selection and retention of replacement gilts must go through three processes: primary selection, intermediate selection and final selection. Primary selection is when moving from the farrowing stage to the rearing stage, determining a candidate group 4 times the number to be retained for breeding; intermediate selection refers to the period from nursery to fattening
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Soybean Jinyi 30 Selected as a 2008 Ministry of Agriculture Recommended Leading Variety
The new soybean variety "Jinyi 30", bred by researchers at the Institute of Crop Genetics of the Shanxi Academy of Agricultural Sciences, was recently selected as a leading variety for nationwide promotion in 2008 by the national Ministry of Agriculture, and is the only variety from our province to be selected. To comprehensively advance the science and technology outreach project and guide farmers in selecting superior varieties and applying advanced, suitable technologies, the national Ministry of Agriculture recommended a total of 80 leading agricultural varieties for nationwide promotion this year. "Jinyi 30" is a large-seeded variety. The plant has thick, sturdy stems, a well-developed root system, and
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Detailed Explanation of Key Technical Points for Site Selection and Land Preparation in Goji Berry Cultivation
(1) Choose a nursery site with convenient irrigation, flat terrain, ample sunlight, deep soil layers, and well-drained sandy loam. In late autumn or early winter of the year before sowing, plow deeply 25-30 cm. While preparing the land, apply 2500-3000 kg of barnyard manure per 667 sq m, irrigate with winter water, and wait until the soil thaws 10 cm in the following spring. Then prepare the land again and harrow it fine, form raised beds 120-130 cm high, level the bed surface and break up the soil clods, ready for sowing or cutting propagation. (2) For the planting site, it is advisable to choose light loam or sandy loam with convenient drainage and irrigation, and a salt content below 0
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Detailed Explanation of Key Points of Artificial Selective Breeding Techniques for Snakes
Strengthening artificial selective breeding of snakes is of great significance for improving snake reproduction survival rates, growth and development speed, product quality and economic benefits. It is work that snake farms cannot afford to neglect, and it must be carried out year-round with unremitting effort. In selective breeding, the following three points should be well handled: 1. Selection of breeding eggs. Breeding eggs placed for incubation must be fresh and of high quality. Eggs stored for a long time have a low hatch rate and a high mortality rate; the hatchlings are weak and grow slowly. Therefore, female snakes should be checked frequently before laying eggs. When eggs are found to be approaching the cloaca, they should be promptly
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What are the methods for selecting a nursery site for almond seedling cultivation?
The selection of the nursery site is key to the success or failure of seedling cultivation. Choosing an unsuitable site will not only affect the yield and quality of the seedlings but may even waste all the previous effort. For almond nursery sites, it is advisable to choose flat terrain, fertile soil, deep soil layers, a groundwater level below 1.5 m, good irrigation and drainage conditions, and loose-textured neutral loam and sandy loam. Soil that is too clayey tends to become compacted, affecting seedling emergence and the growth and development of the seedlings. Nursery sites must absolutely avoid continuous cropping, as continuous cropping leads to the occurrence of diseases and affects the survival rate and growth and development of the seedlings. Any land where stone fruit tree seedlings have been grown
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Procedures for Individual Selection in Fox Breeding
1. Primary selection: After weaning, selection is mainly based on the production performance of their ancestors. Those whose parents have excellent production performance, were born early, and developed normally are retained for breeding. For primary selection, young silver-black foxes should be born before April 5 for males and before April 10 for females; young Arctic foxes selected in the primary selection should be born before May 20. During primary selection, 40% more should be retained than the breeding plan requires. Selection of adult male foxes is carried out after mating, and selection of adult female foxes is carried out after the cubs are separated. Those with poor mating ability and poor semen quality
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Cotton seed: never harvest prematurely opened bolls; pay attention when saving and selecting seed
According to data from seed management department testing, in recent years the germination rate of some cotton seed has been only around 60%, still far from the national standard of 80% germination rate. From extensive surveys, the reasons for low cotton seed germination rates are: first, harvesting immature prematurely opened bolls; second, purchasing "favor bolls" with high moisture content; third, mixing in diseased seed from rotten cotton bolls; fourth, storing cotton seed in the warehouse before it is fully sun-dried; fifth, containing some cotton seed broken during processing; sixth, relatively high residual acid content in coated cotton seed; seventh, not strictly
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Detailed Explanation of Parent Turtle Selection Techniques and Picking Methods
Turtles are small amphibious reptiles that combine edible nourishment, medicinal healing, and ornamental enjoyment in one, and are therefore loved by people, with their value rising year by year. Turtle farming is a good path for farmers, herders, fishermen, and laid-off workers to escape poverty, achieve prosperity, and find reemployment. However, due to the current shortage of parent turtles (breeding turtles) on the market, some people, eager to get rich, buy any turtle they see on the market. This makes it easy to bring inferior turtles or culled old turtles home. So, how can this phenomenon be avoided? -- Select those with strong constitution
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Key points of tea cultivation: selecting improved varieties and reasonable close planting
1. Selecting improved varieties Seeds (seedlings) are the basic means of production in tea cultivation, and any cultivation method is built on the improved varieties of a given period. Since the 1980s, tea cultivation has entirely adopted the close-planted, dwarfed, no-tillage method. Because individual space is reduced and population density increased, it is all the more necessary to match this with suitable improved varieties in order to achieve the desired results. For example, Fuding Dabaicha, Qianmei 101, Qianmei 303 and others are all fine tea varieties suitable for close planting. 2. Collection and
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A Detailed Guide to Selecting and Disinfecting Lily Bulbs
Before planting, according to the natural growth of the seed bulbs, carefully separate the small bulbs growing joined together (one bulb can consist of 2-5 small bulbs) with a bamboo knife or by hand, and grade them by size. The large ones are sold, the small ones are kept for continued bulb propagation, and the medium ones are used as seed bulbs. The size of seed bulbs varies by variety; generally 3-5 cm in diameter and about 35-50 g in weight. You should also choose bulbs free of pests and diseases, damage, and deformities as seed bulbs, and do not damage the existing root system when separating the bulbs. Disinfection method: soak in a 1:500 benomyl or captan solution for 20-30 minutes.
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