First, to strengthen the selection of breeding ewes with multiple heritability is highly heritable, sheep ovulation 2 to 6, more than 9 mature eggs; goats 2 to 7, more than 10 mature eggs. Therefore, it is often necessary to choose to keep multiple lambs in the flock, especially the first lamb or the ewe of its own. You should also choose to stay as a twin ram as a ram.
Second, to increase the proportion of ewes in the flock of sheep in the study shows that the rate of euphorbiae is generally high. Therefore, ewe from 4 to 6 years old should account for 55% to 60% of the total number of sheep. This is An important measure to increase the rate of ewes proliferation.
Third, improve the pre-male weight Ewe before mating and body weight is closely related to fertility, breeding weight increased by 5 kilograms each, double lamb rate can be increased by 9%. According to relevant unit tests, ewes less than 40 kilograms before breeding, estrus and fecundity rate of 68%, all producing single lamb; 40 to 61 kilograms or more, the conception rate of 73% to 100%, lambing rate of 100% to 150% .
Four, short-term superior feeding and breeding 2 - 3 weeks before the short-term excellent feeding, each ewes daily feed 0.2 to 0.25 kg, trace element additives 1 to 2 grams, but also make up VE and VA preparations, so that the ewes live weight increase 3 More than åƒ5 kilograms can increase the rate of double lambs of ewes from 5% to 10%.
5. Use of Pregnancy Urine Gonadotropin (PMSG) A single injection of PMSG 500 to 1000 IU on the 12th or 13th day of the estrus cycle (ie, 4 days before the ewe’s estrus approach) can promote lambs and lambs .
Six, mating methods timely multiple insemination is one of the ways to promote a child's prolificacy and increase the reproductive rate. The sperm live in the ewes' uterus for about 9 hours. If the ewes row two or three eggs, they are not discharged at the same time. In order to fertilize the eggs, it is possible to lose weight in the middle and late stages of the ewes' estrus. Improve the conception rate. In production practice, methods such as repeated dispensing, double dispensing, and mixed semen insemination are often used. Actively performing artificial insemination can give full play to the role of excellent rams.
Seven, the introduction of multi-species blood species with multiple breeds and local breeds is the fastest, most effective and easiest way to increase fertility. According to the research, the local goats were improved with Shanneng goats, and their offspring's age can be increased by more than 80%, and the double lamb rate is increased by more than 40%.
Eight, fed dihydropyridine and injecting double lamb According to research, every 10 kilograms of feed added to 10 to 20 grams of dihydropyridine, sheep lambing rate increased by 6.1%, the female's daily gain increased by 19.1%. In the first 7 weeks before mating, each ewes were injected subcutaneously with 2 ml of dilavin, and 2 ml was injected 4 weeks before mating. The lambing rate can be increased by 18.57%.
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