Recently, Wei Yuanfu of Hai'an County reported to the newspaper “The Pastoral Doctor 110†that he had raised sheep for many years. Some nearby sheep farmers will gather at his house to discuss how to raise sheep. After discussions, it was generally believed that although the income of sheep was raised in recent years, Not bad, but goats only have estrus once a year, and only give birth to 1 or 2 lambs at a time, and the single-crop rate is relatively high. Production investment is too large and the output rate is relatively low. He asked: Is there any way to increase the goat's farrowing rate and shorten the goat's estrus cycle?
It is understood that most of China's goat breeds are seasonal estrus animals. Under natural conditions, estrus generally occurs around September, and will be produced around February next year. In addition, the reproduction rate of goats in our country is relatively low, and only one or two animals can be produced per child. The high-reproduction rate in China is small-tailed sheep and Hu sheep, and the average number of litters per birth is more than two.
The reporter interviewed Wang Gongjin, researcher of the Animal Embryo Project Team of the Animal Husbandry Institute of the Jiangsu Academy of Agricultural Sciences. Wang Gongjin said that the method of improving the utilization of ewes and shortening their estrus cycle in production is often used in large-scale farms. Ewes concentrate on estrus to facilitate artificial insemination and post-natal care for lambs. This method is to artificially aphrodisiac the ewes at the first and second half of the month after they are born. Generally, the ejaculation is expressed for about half a month and the symptom of departedness is expressed. The estrus is then timely bred according to clinical estrus symptoms. When lambs have reached 2 months of age, they can feed on their own and have little effect on their growth. This method also applies to free-range households.
“Currently, as the maternity parent of the fattening sheep, it is mainly a generation of sheep. However, in view of the breeding effect in recent years, the single birth rate of the Bo hybrid generation sheep is higher than that of the local breed sheep.†Wang Gongjin said that currently used Goat artificial aphrodisiac drugs mainly include pregnant horse serum, progesterone, and promote row No. 3, in addition to shortening the goat's estrus cycle, but also can promote multiple ovulation and increase litter size. After several clinical trials have shown that after the induction of estrus in the first-born ewes with a high single birth rate, the number of litters per birth can reach up to two.
Isn't it difficult for this artificial aphrodisiac to induce multiple ovulation and early estrus in goats? Wang Gongjin stated that the operation method is relatively simple. At present, the method of artificial evulsion of vaginal suppository is used to induce estrus. The sponge (vaginal suppository) impregnated with progesterone is to be placed on the outer cervix of the ewes for 10 to 14 days. After stopping the drug, pregnant goat serum gonadotropin 400 to 500 units were injected for superovulation and estrus promotion. After 30 hours, the ewes began to heat, which can be timely breeding.
"Every goat usually induces estrus at a minimum cost of about 20 yuan." Wang Gongjin said that although the cost of induced estrus is relatively high, if the estrus cycle of ewes, the breeding time, and the ewe can be shortened smoothly, the ewes can also be improved. With an output rate of 3 births in two years, the farming income is also considerable.
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