How to promote the prolificacy of sows to produce strong piglets

How to make sows produce more and stronger piglets, reduce the cost of weaned piglets, and promote the healthy growth of sows, which requires doing everything possible to improve the level of sow feeding and management.

I. adjust the proportion of gestational age structure

3Mel 6-litter sows are in the best period of reproductive performance. in order to ensure the group fecundity of sows, sows at this gestational age should be kept at about 60%, 30% for first-born sows and 2-litter sows, 35% for 7-litter sows and 5% for more than 7 sows.

2. Selection, retention and feeding of reserve sows

The reserve sows were selected one month before mating. The method is to combine the reproductive performance of the family, select sows with well developed, many and normal nipples, large and normal nipples and vulva, and wide hind legs, preferably two rows of nipples with three pairs of nipples in front of the navel. After selection and retention, feeding should be properly restricted so as not to make sows too fat or too thin (up to 2.5 cents 3 of the American Grade 5 score standard, vertebrae and ribs can not be seen, but vertebrae can be touched, ribs can not be touched). The feeding began 2 weeks before mating. It reached 2.0MUR 2.5 kg. The nutritional level of feed is about 16% of group protein, and the requirements of minerals and vitamins are sufficient.

III. Feeding and management of weaned sows

In order to prevent mastitis, sows should be gradually reduced to about 2 kg 3 days before weaning. However, in order to promote estrus and increase the number of ovulation in sows after weaning, high-quality feed (crude protein ≥ 16%, metabolic energy ≥ 3.1 MCAL / kg, lysine ≥ 0.8%) should be used.

IV. feeding and management in the early stage of pregnancy

Sows are generally mated twice, and low-energy and low-protein feed (- like crude protein ≥ 14%, metabolic energy 3.0-3.1 MCAL / kg) should be provided from the second day of the second mating to 3 weeks after mating. Daily feed volume is 1.5 Mu 2.0 kg, otherwise. It will affect the secretion of progesterone due to excessive food intake and increase embryo death. reduce litter size.

From the 4th week of pregnancy to the 80th day of pregnancy, the feeding of low-energy and low-protein diet should continue, but the daily feed quantity should be 0.5 kg more than that in the early stage of pregnancy, reaching 1.8 Mel 2.3 kg per day. At this stage, the suitable fat condition of sows must be ensured, and it is best to control it to 2.5-3 of the American Grade 5 score. If it is not easy to master, "it is better to be thin than fat". Because overfeeding during pregnancy can lead to lactation anorexia, natural secretion, or too much weightlessness. Affect the fecundity of the postparity.

5. Feeding and management of sows in the later stage of pregnancy

It is recognized that the baby will be born from 80 days of pregnancy in order to ensure the rapid growth of the fetus. To improve the birth weight and health level of piglets, sows should be fed with high-energy and high-protein feed at this stage, with a daily feed of 2.3-2.8 kg. The sows were expelled both in vivo and in vitro 2 weeks before delivery, and the body surface was disinfected and transferred to the litter house (bed) one week before delivery.

VI. Feeding and management of lactating sows

During lactation, you should be fed with high-energy and high-protein fodder. Generally, the crude protein is more than 16% and the digestive energy is more than 3.1 MCAL / kg. The amount of feed in the first 3 days after litter birth was 1.8Mel 2.3 kg, and increased by 0.5 kg per day from the 4th day until free feeding.

VII. other important factors affecting the conception rate and the survival rate of piglets

1. Timely mating through external hormones, divided into pig septum nose and nose contact, back pressure reflex test and other sow estrus symptoms observation, estrus identification should be carried out twice a day, sows accept boar crawling as estrus. Generally, the sows found in estrus in the morning were mated for the first time in the afternoon and the second time in the morning, and the sows found in estrus in the afternoon were mated for the first time the next morning. The second mating was carried out in the afternoon.

2. The use of cord to regulate the use of reproductive hormones in sows can achieve better results in some cases. However, the use of hormones must be based on feeding and management, maintain the normal medium-thin body condition of sows, and prevent disease infection. On this basis, sows that are still unable to breed normally in estrus can be regulated by hormones. Here are several drugs commonly used in production:

① ovulation induction No. 2 (LHRH-A2) and ovulation induction No. 3 (LHRH-A3) play the role of gonadotropin-releasing hormone and promote ovulation and estrus. This product is produced by Ningbo hormone products Factory, with 25 micrograms per sow.

② pregnant horse serum (PMSG) is currently available in Tianjin Experimental Animal Research Institute. Each sow uses 1000 units. After estrus, the combination of ovulation induction 2 25 micrograms, ovulation induction 3 25 micrograms or human chorionic gonadotropin 500 units is more effective.

③ human chorionic gonadotropin (HCG), produced by Ningbo hormone products Factory and Nanjing Animal hormone Factory, can be used alone or in conjunction with pregnant horse serum.

④ androgen drugs: triad hormone, chloroprostol. It is generally available on the market and can be used as a drug to treat sows without estrus to start the estrus cycle, but it is generally impossible to conceive normally in the first estrus.