Key points of feeding and management of reserve sows

The feeding and management of reserve sows mainly pay attention to the following aspects:

1. Fat control and boar induction: the reserve sows should be fully developed before 60kg, and should be properly restricted from 60kg to the first half of the month to prevent them from being overweight, feeding about two kilograms a day, twice a day. The feed for growing and finishing pigs can be used for reserve sows. When the reserve sow reaches 160 days old, it is best to drive the sow into the adult boar pen for 35 minutes every day. The external hormones secreted by the mandibular glands of adult boars help to induce estrus in young sows.

two。 Short-term preferential feeding: 14 days before the breeding of reserve sows, feeding can be strengthened and free feeding can be carried out, so that sows can ovulate about 2.5 more eggs, which undoubtedly plays an important role in increasing the litter size of parturient sows.

3. Sow at least second estrus mating: the number of ovulation of the sow is related to the number of estrus. During first love, the litter size is low due to the low number of ovulation, and because the first-born sows account for about 30% of the total number of sows, how their litter performance directly affects the whole herd. The important purpose of inducing boars to estrus early is also to make them have several more estrus before mating. Some pig farms have no record of the number of estrus of their sows, which is undoubtedly an incorrect method of operation.

4. Single mating and double mating: the best time for mating should be 26 hours after the sow is allowed to climb. Single mating means that in estrus in sows, boars are used to mate only once. Although this can reduce the number of boars, but because the optimal breeding time of sows is difficult to grasp, so single mating may reduce the conception rate and litter size. Compounding refers to mating twice with the same boar in a period of estrus, with an interval of 8 mi 12 hours. In production practice, different boars of the same breed are often matched twice at intervals. This method can often have more dynamic sperm in the reproductive tract of sows, increase the chance of egg fertilization, and thus increase the litter size of sows. Double mating refers to the use of two boars of the same breed or different breeds to mate with the same sow twice in a short time interval (10 Mel 15 minutes) during the same estrus. This method can accelerate the maturation of eggs, shorten the time of ovulation and increase the number of ovulations. However, due to the short interval between two mating, this method often has similar shortcomings as monogamy. About the mastery of the best time for mating, there are four proverbs for reference: when the vulva touches the grass, the insemination is just right; the expression is in a daze, and the insemination is conceived; standing still is just the right time to mate; and the mucus thickens, just the heat. Song Youxue