Breeding method for replacement gilts

Abstract

The invention discloses a breeding method for replacement gilts. The method comprises the steps that excellent gilts are selected from 70-day-age piglet groups of filial generation of landrace boars and Dahe black pig sows to be reserved for serving as the replacement gilts; the excellent gilts are bred in four stages according to the characteristics of the physiological properties and the nutritional requirements of the replacement gilts in each stage, daily ration is specifically prepared from special feed raw materials and Chinese herbal medicine additives in each stage to promote growing development and oestrus ovulation of the replacement gilts, and the optimal hybridization characteristics of the replacement gilts are obtained by adopting a self-help feeding mode and a restrict feeding mode; replacement gilt groups are screened and optimized for three times in the breeding stage, and the gilts of which growing development and immune antibodies are not in accordance with the breeding standards. According to the replacement gilts bred through the method, the breeding qualified rate reaches 90 percent, the conception rate of first farrowing sows reaches 90 percent and is increased by 4-5 percent points compared with a common breeding method, the live born number per litter is increased by 1, and the better economic benefit and social benefit are achieved.

Description

technical field [0001] The invention relates to the technical field of pig feeding methods, in particular to a breeding method for gilts. Background technique [0002] Back-up sows refer to gilts selected at the age of 70 days to sexual maturity and body maturity, which can be used as breeding sows. Sows at this stage are collectively called back-up sows. There are three main requirements for the breeding of gilts: ① moderate fatness in the mating period, and 80% fatness of fat pigs is better; ② mammary glands and genitals must be fully developed; ③ body shape and appearance must meet the characteristics of breeding. [0003] Current status of gilt breeding. In order to reduce costs, rural households in rural my country generally buy gilts with better body shape in the market, and breed them according to the breeding method of fat pigs until 2 to 3 estrus periods. The elimination rate is high, the conception rate of breeding is low, and the production The litter size is als...

AI Technical Summary

Problems solved by technology

In large-scale pig farms, most of them choose Landrace and Yorkshire binary hybrid sows as gilts. They are bred according to the method of fattening pigs at the age of 6 months. In July, it takes one month to adjust the fat strength. At the age of 8 months, they enter breeding. During the 7-month-old period, the replacement pig feed with low energy protein is used for limited feeding and fat loss, and the reproductive ability is not ideal.