Work objectives: Complete weekly breeding tasks as planned, ensure balanced production throughout the year, ensure that the rate of mating and childbearing is above 85%, ensure that the average number of live litters per litter is above 10, and that the qualification rate of gilts is above 90% (turn The basic group of people shall prevail.
First, gilt feeding and management. The rearing and management of rearing pigs is directly related to the age of first match, the age of use, and the lifetime production results. If there is not a good incubation period for gilts, the replacement rate of gilts will increase. At present, most of us choose to grow and grow or hybridize. These breeds have one common characteristic: late sexual maturity and indistinct estrus symptoms, which add certain difficulty to the breeding work and the development of reserve cultivation becomes more important.
1. Gilt nutrition
The nutritional status of gilts has a major impact on their reproductive performance. Usually trophic strategies are adopted for gilts before and after, and the restriction feeding in the later period is extremely critical. Proper restriction of grazing can not only ensure good growth and development of gilts, but also control the rapid growth of gilts and avoid excessive obesity. Groomed gilts should be fed diets with higher levels of nutrition. High-energy diets will ensure adequate body fat reserves. Stable weight gain requires adequate levels and quality of protein.
If the gilt does not store enough fat during the first pregnancy or during the first lactation, it will consume body fat to maintain the normal development of the fetus. As a result, the sow will enter the second breeding cycle with poor lyrical state. Caused a decrease in the number of litters in the second litter and poorly developed piglets. The restriction of gilts depends on their individual condition. It must be ensured that the weight of gilts can reach 12Okg when they are mated, and the thickness of gilts is more than 16mm. Many gilts have delayed estrus due to limited feeding, and generally limit the free feed intake of gilts to 50%, and puberty will be delayed by 1-1 weeks. Protein deficiency and Amino Acid imbalances also have a significant effect on puberty. To ensure normal puberty, diets should be formulated according to the growth and development stages of the gilts. Studies have shown that diets containing about 1% crude protein and 0.7% lysine are sufficient. The gilts diets should contain higher levels of calcium and phosphorus, which are 0.95% and 0.80%, respectively, compared to those of finishing pigs and reserve boars. The level of other mineral elements and vitamins in the diet is also higher than that of finishing pigs.
The nutrition of gilts, on the one hand, can affect the puberty; on the other hand, it also affects the number of ovulation and the conception rate. Sows prior to 6 months of age should be fully stocked and free to feed. After 6 months of age, feed intake should be appropriately limited before mating to prevent over-fertilization and affect reproduction. For gilts, there is a short-term excellent feeding to increase the number of first-born litters, ie within 10 to 14 days before breeding. , increase their feeding amount by about 1kg, that is, after each estrus, no breeding and short-term excellent feeding to the 2nd estrus breeding to promote estrus estrus and ovulation.
Immediately after the breeding, restore to the usual amount. The gilts must either supply dedicated gilts or use lactating sows to feed, and must avoid feeding gilts with finishing pigs. The basic requirements for gilt first mating: 220-230 days of age, weight 110-115kg, backfat thickness 16-20mm, breeding time: the second period.
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