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Measures to Improve the Breeding Rate of Small Tail Han Sheep
The strong reproduction rate is the outstanding characteristic of Small Tail Han sheep. In feeding and management, the use of small-tailed Han sheep perennial estrus, shorten the breeding cycle, grasp a one-child polygamy technology, increase reproduction rate, is the key to raising small tail Han sheep to obtain revenue. There are many factors affecting the reproduction rate of Small Tail Han sheep. There are single factors and comprehensive factors. In the production practice, only by correctly analyzing many factors and taking effective countermeasures, can we obtain the maximum output. 1. Selecting the male and female rams of Damo lamb to be hereditary. When selecting male and female rams for breeding, their upper generation male and female ewes should be selected from the reserved sheep with a single birth size or more. . These male and female mutton with good genetic basis are reserved for species use, which can fully exert their genetic potential in breeding and increase the chance of ewes having multiple births. Second, to strengthen the breeding of sheep nutrition to strengthen the nutrition of sheep is an important measure to increase the reproduction rate. Adequate nutrition makes the sheep have a healthy body condition and moderate sensation. The ram maintains a strong sexual desire. When sperm is used for breeding, there are many sperms, strong vitality and high fertility. The ewes can be estrus all year round, and the gestating fetus can be healthy after pregnancy. Well-developed, postpartum milk is sufficient, the lamb is born with a large number of animals, and the survival rate is high. At the same time, the odds of how bad the ewes are produced will increase. Therefore, small-tailed sheep must be fed with sufficient mixed concentrates, whether grazing or feeding. The rams are required to feed 0.5-0.6 kg of mixed coarse material per day during the non-breeding period, 0.8-1.0 kg of mixed fines per day, and 1.7-1.8 kg of roughage per day during the breeding period; 0.3- 0.4 kg, pregnant ewes with the increase in the number of days of pregnancy (especially late), but also should gradually increase the amount of fine material. The concentrate must contain sufficient amounts of protein, energy, vitamins, trace elements and Other minerals, and ensure sufficient drinking water. Green feed is particularly important for breeding sheep. Because the green feed can make up for the deficiency of nutrient deficiency in the roughage, increase the sperm density and vigor of the ram, promote the maturation and multiple ovulation of the egg in the ewes, increase the probability of producing multiple lambs, and promote the development of the fetus in the pregnant ewes. And growth, to ensure that the output of the lamb is a major new birth, and the high survival rate has an important role. 3. Raising the proportion of young and middle-aged ewes in the flock The early-young ewes and the old and weak sheep in the flock are inferior to those of the ewe. According to statistics, small-tailed Han sheep produce fewer lambs, generally only seen in first-born sheep, and a higher proportion of twin lambs. The ewes have the strongest reproduction rate from 3 to 4 years of age in their lifetime, and the breeding period is generally 8 years. Therefore, in order to improve the overall level of the flock, rationally adjust the herd structure, supplement young ewes systematically and appropriately increase the proportion of ewes aged 3 to 4 years in the flock, and discover and eliminate old, weak or low fertility in time. The ewes have become the problems faced and must be solved by the authors of animal husbandry. On this basis, they can achieve the goal of increasing the overall reproduction rate of the herds. Fourth, the implementation of two mating ewes estrus, the implementation of double mating or two breeding insemination, can increase the ewes quasi-fetal rate, increase the probability of producing double lamb, because the ewes short time (usually about 30 hours) The time for survival of the discharged eggs is also shorter, and the maturation time of some of the ewes is inconsistent. Therefore, the probability of one mating or losing accurate fetus is low, and it is difficult to make more eggs participate in fertilization. By using two breeding methods, spermatozoa with fertilized ability can often be maintained in the genital tract of the ewe, increasing the chance of fertilization. The commonly used method in production is to inseminate the estrus of the ewes after 12 and 24 hours, and each insemination will occur once in 12 and 24 hours. Generally, the interval between two inseminations is 10 to 12 hours, which can effectively increase the gestation rate of the ewes. V. Lambs Early weaning Lambs Weaning early, timely, and shortening the time of ewes feeding can promote early estrus in ewes and achieve a year of prolificacy. Early weaning lambs need to artificially train the lambs' feeding power. When the lambs are 10-15 days old, they can feed fresh grasses, leaves or soft and digestible hay and leaves to stimulate the early formation of digestive tract digestive function and to lambs. Self-feeding direction transition. To make lambs eat as early as possible, start by mixing corn and bean noodles with porridge or eating them in water for the lambs to eat. You can also store the fried condiments in pots for the lambs to feed themselves. 20 to 30 days after the normal intake. 6. Injecting drugs or hormones to induce ewes to produce lambs. Use a substance that can promote ovarian follicular maturation and multiple ovulation, inject into the ewes with a certain dose, strengthen the sexual function of the ewes through hormone regulation, and promote the mother. The development and maturation of the sheep's egg results in the discharge of more eggs to participate in fertilization, reaching the goal of a single birth. According to experiments, the injection of pregnant horse serum or injecting dilavin and digesterin has a certain effect on the induction of ewes producing multiple lambs.