A Study on the Multi-Fetal, High-Yield Technology for Three-Way Crossbred Sows

(Agricultural Wealth Network) In order to improve the multi-fetal, high-yield performance of three-way crossbred sows and the economic returns of pig farming. In 1998, at the Yiliba Pig Farm in Tailai County. Experimental research was conducted on the problem of increasing litter size in 24 adult three-way crossbred sows with multiple fetuses. The estrus patterns of sows were explored. The favorable timing of ovulation in sows was grasped. Mating was carried out at the appropriate time. So as to achieve the goal of producing more piglets. Through these efforts. Relatively good results were obtained. An average of 2.5 litters per year. More than 30 piglets per year. 1. Estrus patterns of sows The puberty, estrus duration, and sexual cycle of 24 sows were summarized. From Table 1 it can be seen that: sexual maturity in three-way crossbred sows is relatively normal. Puberty generally occurs at about 7 months. In some cases at 6.5 months. In late cases at 8 months of age. Body weight at puberty is 58-82 kg, estrus duration is 1.5-3 d, and the sexual cycle is 18-25 d. The average is 20.8 d. Estrus manifestations: during estrus the vulva suddenly enlarges, swells and becomes congested, sometimes a watery milky-white mucus appears. Behavior is restless. Mounting pen mates. When pressure is applied to the back with the hand, the sow stands still. Especially when seeing a boar, the "standing reflex" is obvious. Both ears erect. Both eyes half-closed. Hind limbs stiff. Showing a dazed appearance. Temperament is quiet and gentle, urination is frequent. This is the suitable mating period. 2. Grasping the appropriate mating time for sows Because the duration of estrus in sows is long. While the time during which sperm and eggs retain fertilizing capacity after being released is short, therefore careful observation and study of the timing of estrus and ovulation in sows is very important. From Table 2 it can be seen that: the most suitable mating time for three-way crossbred sows is 12-24 h after the onset of estrus. The conception results are best. When mating was carried out 12 h after the onset of estrus, 13 of 16 estrous periods were confirmed pregnant, an estrous conception rate of 80.6%; when mating was carried out 24 h after the onset of estrus, 20 estrous periods. 18 conceived. An estrous conception rate of 90%. From the mating and conception results of sows, it is inferred that ovulation generally occurs 24-48 h after the onset of estrus, and the majority of ovulation peaks occur 30-36 h after the onset of estrus. It is known that the time during which pig eggs retain fertilizing capacity after being released from the ovary is 8-12 h, sperm retain fertilizing capacity in the sow reproductive tract for about 24 h. Adding the time required for sperm and egg transport within the sow reproductive tract and for sperm capacitation. Therefore. The method of the most suitable mating time being 12-24 h after the onset of estrus is better. 3. Strictly observing estrus in lactating sows Mating and conception of lactating sows as early as possible is the key to achieving 2.5 litters per year. Sows have several estrous periods after farrowing. But the manifestations are less obvious than after weaning. The duration is also shorter. If one is not careful it is easy to miss them. Generally the first estrus is not suitable for mating. Mating between 28-40 d after farrowing is more suitable. The conception results are good. In order to promote lactating sows to return to normal estrus as quickly as possible, lactating sows and piglets should be raised separately. With the method of regular suckling. At the same time, piglets begin supplemental feeding 7-10 d after birth. After 20 d, the number of suckling sessions is gradually reduced. In this way the estrus of lactating sows can be promoted. For individual sows whose estrus is not obvious, some estrus-inducing drugs can be administered. In summary. The main measure to achieve multi-fetal, high-yield performance in sows is to grasp the estrus patterns of sows. And to carry out mating at the appropriate time.
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