Study on high yield of multiple births in three-way hybrid sows

(agricultural Wealth net) in order to improve the multiple birth yield of three-way hybrid sows and the economic benefits of raising pigs. 1998 in Tailai County Eriba Pig Farm. There were multiple births in 24 adult sows raised by three-way crossbreeding. An experimental study was carried out on the problem of increasing litter size. To explore the oestrus rule of sows. Grasp the favorable time of ovulation in sows. To achieve timely breeding. In order to achieve the goal of producing more babies. Through hard work. Get better results. The average annual output is 2.5. Give birth to more than 30 babies a year. 1. The estrus rule of sows summarized the proestrus, estrus duration and sexual cycle of 24 sows. It can be seen from table l that the sexual maturity of three-way crossbred sows is relatively normal. The first period of estrus is usually about 7 months. A few are in 6.5 months. The late ones are 8 months old. The body weight at proestrus was 58-82kg, the duration of estrus was 1.5-3 days, and the sexual cycle was 18 Mel for 25 days. The average was 20.8 days. Estrus performance: during estrus, the vulva suddenly enlarged, swollen and congested, and sometimes watery milky mucus appeared. Acting uneasy. Climb across the same herd of sows. Stand still with your hands on your back. Especially when you see a boar, the "daze reaction" is obvious. Two ears stand. My eyes are half closed. The hind legs are stiff. Showing dementia. Gentle and quiet temperament, frequent urination. It is the adaptation period. 2. Mastering the timely mating time of sows is due to the long estrus duration of sows. The sperm and eggs have the characteristics of short time of fertilization after ovulation, so it is very important to carefully observe and study the estrus and ovulation time of sows. It can be seen from Table 2 that the optimum breeding time for three-way crossbred sows is 12 / 24 hours after the onset of estrus. The conception effect is the best. Twelve hours after the onset of estrus, 13 pregnancies were inseminated in 16 estrous periods. The conception rate of estrus is 80.6%; 24 hours after the beginning of estrus, 20 estrus are mated. The balcony is 18. The estrus conception rate is 90%. From the situation of mating and conception of sows, it is inferred that the time of ovulation is generally 24ml / 48h after the beginning of estrus, and the most exciting part of ovulation is 30m / 36H after the onset of estrus. It is known that the time for pig eggs to be fertilized from the ovaries is 8 / 12 hours, and the sperm can be fertilized in the reproductive tract of sows for about 24 hours. in addition, the time required for sperm and egg movement and sperm capacitation in the reproductive tract of sows. therefore. It is better that the optimal mating time is 12 hours after the onset of estrus. 3. Strict observation of the estrus of lactating sows the early mating and conception of lactating sows is the key to achieve 2.5 births a year. The sow is in estrus several times after giving birth. But the performance is not as obvious as after weaning. The duration is also short. It's easy to miss if you don't pay attention to it. Generally speaking, the first estrus is not suitable for breeding. It is more suitable to mate between 28 and 40 days postpartum. The conception effect is good. In order to promote normal estrus of lactating sows as soon as possible. So that lactating sows and piglets are raised separately. The way to release milk regularly. At the same time, the piglets were supplemented 7-10 days after birth. The times of lactation decreased gradually after 20 days. This can promote the estrus of lactating sows. Individual sows who are not in estrus can take some estrous drugs. To sum up. The main measure to realize the high yield of multiple births of sows is to master the law of oestrus of sows. To achieve timely breeding. -- Thank you for sharing, help-- thanks for sharing. Help the top-- thanks for sharing, helping the top