1. For broodstock selection, the 3rd instar adult fish with large body size, robust physique, intactness, strong activity, and body color are used as broodstock. Females weigh more than 100g, males weigh more than 250g, and the male to female ratio is 1:1.
2, broodstock cultivation on the broodstock pool cultivation. The broodstock breeding pond should be close to the water source, convenient for irrigation and drainage, and has an area of ​​667 to 2,000 square meters and a water depth of 1.5 to 2 meters. The east-west rectangular pool is preferred. Submerged plants must be planted in the pool to keep the water fresh. At the same time, five kilograms of freshwater prawn were hatched every 667 square meters to breed young shrimps, and then they were used as bait for yellow sturgeon fry. Per 10,000 square meters of stocked broodstock 150 to 200 kg, male and female stocking ratio of 1:1. In order to regulate the water body fat, a small amount of carp can be used in the pool. Daily appropriate feeding of animal feed, such as livestock and poultry, fresh fish, shrimp, snails and other fine material. Pay attention to change the water and keep the water fresh.
3, male and female bred fish to identify general mature individuals, male than female. The male has a thin belly and a conical genital ridge that is white or milky white. The female abdomen is inflated and soft and elastic. There is no genital process. Only the excretory hole is located behind the anus.
4. Artificial ovulation The broodstock with well-developed gonads and consistent maturity is subjected to artificial oxytocin production. Mature females have good abdomen swelling and softness, prominent ovarian contours, and swollen and enlarged genital pores. Male individuals are large, because the structure of the testis is dendritic, and it is difficult to extrude semen. The reproductive mutations become hard and the vents become red. There are two kinds of male and female ratios: the proportion of males and females who are naturally fertilized and fertilized is 1:1.2; artificial insemination is performed, and the male to female ratio is 5-7:1. The effect of oxytocin on the mixed use of multiple oxytocins was good. Two injections were used. The first dose was 0.5 mg DOM+0.5 μg LHRH-A3+0.2 mg PG; the second dose was 2 mg DOM+3 μg LHRH-A2+. 0.8mg PG+800IU HCG, the time interval between the two needles is 12h, and the male and female doses are the same. When the water temperature is 24 to 28°C, the effect time is 20 to 22 hours after the injection of the second needle.
Using natural spawning methods, the bottom of the spawning tank should be filled with disinfected brown tablets and other fish nests, and the water flow should be increased to stimulate the estrus estrus. The fertilized eggs adhere to the fish nests. After the eggs are laid, the fish nests are placed in a hatching tube or a hatching ring to incubate water.
Using artificial insemination method, after the effect time, the male fish were taken to the testis, then cut into pieces and placed in a dry mortar to grind. A small amount of 0.567% Ringer's solution was added. Eggs are squeezed in a dry and clean white porcelain dish, and the sperm and eggs are quickly mixed. At the same time, a little Renshi liquid is added and gently stirred with feathers for 1 to 3 minutes. The fertilized eggs are evenly adhered to the mesh and put into running water for incubation. During the incubation period, the water quality is kept fresh, and the dissolved oxygen is sufficient. The water temperature is maintained at 24 to 28°C. Generally, the fry is hatched after 38 to 42 hours.
Meat chicken (fat) has a high nutritional value and a variety of cuisines. Chicken (fat) whether steamed, braised, or braised, Fried, rich flavor, rich nutrition. The meat chicken (fat) also has the higher nourishment value of the food.Broiler is rich in protein, its fat contains unsaturated fatty acid, so it is good protein food for elderly and cardiovascular disease patients. It is more appropriate to use chicken or chicken soup for postpartum chicken or chicken soup after sickness, especially if it is better.
Core tip: chicken's aroma is largely determined by its "flavor nucleotide", while "chewy" is determined by collagen and elastin in meat. These determinations of flavor and texture are related to the growth of the chicken. The shorter the growth time, the lighter the chicken flavor. But these ingredients have little to do with nutrition. From a food science point of view, the meat of the broiler is still a good food.
Generally applicable to healthy and peaceful constitution, qi deficiency constitution, qi yu physique, Yin deficiency constitution.
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