How to Improve the Breeding Power of Small Tail Han Sheep

Small-tailed sheep are highly welcomed by breeders for their high yield, early growth and development, and large size. With the development of science and technology, the fecundity of the Little Tail Han sheep can be further improved. Scientific practice has proved that after ovulation treatment, small tail Han sheep can ovulate 10 to 50 eggs at a time, and can transfer the fertilized eggs to the corresponding parts of another ewes through embryo transfer technology to achieve the purpose of improving fertility. Under current conditions, embryo transfer cannot be applied to practice. Here are some practical new technologies that are commonly used in production to increase fertility. Establish a three-year production system for the frequent lambing system for one or two years, that is, determine the mating time in May of the same year, January of the following year, and September of the following year. Lamb production will be in October of the current year, June of the following year, and the third year of the following year. February; two-year and five-year production systems, that is, appropriate control and shorten the post-harvest breeding time, can achieve five years of production. Raising the selection of herds of sheep requires large size, robust appearance, good testis development, obvious male characteristics, and excellent semen quality; In line with the characteristics of this species. Lambs that were first weaned during the first two years of age were lambs weaned between 2.5 and 3 months of age, and lambs that were born during the first three years were weaned at 1.5 to 2 months of age. After weaning, pay attention to the cultivation of lambs. Feeding aphrodisiac ewes should improve their dietary compatibility and improve their nutritional level about one month before mating. Through supplementation, both the ewes' estrus uniformity and the number of ovulations can be increased, thereby inducing more ewes in the ewes. Induction of estrus and supernumerary ovulation induced estrus can use the "ram effect" or increase the time of light to achieve the purpose of early estrus of the ewes, but also the application of reproductive hormones to induce estrus and supernumerary ovulation ewes, in order to achieve the purpose of induction of multiple lambs . Weaning ewes or newly weaned ewes can use progesterone (such as progesterone 150 ~ 300 mg) placed in the cervix (or progesterone injection 10 ~ 12 mg / day), 10 to 14 days after the injection of pregnant horses Serum 500 ~ 1000 international units and chorionic gonadotropin 300 ~ 500 international units, to promote estrus ovulation and multiple ovulation, so as to achieve the purpose of induction of multiple lambs. The normal estrous ewes can be intramuscularly injected with 300 to 700 IU of maternal serum four days before the expected estrus (ie, 12 to 13 days of the estrus cycle). After estrus, 200 to 300 international units of human chorionic gonadotropin are injected to induce estrus and multiple ovulation, thereby achieving the goal of producing multiple lambs.

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