How to solve the problem of low reproduction rate of mutton sheep

Feeding fish meal to mutton sheep can improve the reproduction rate.

Feed fish meal contains 90% dry matter, of which ash is about 15%, crude protein is about 65% (about 60% of the clearable protein that can be directly used by animals), and alligator, phosphorus and other minerals are about 7%. It is a good animal feed. In order to improve the breeding value of breeding ram, further improve the efficiency of artificial insemination of sheep, and explore ways to solve the source of protein feed, in the winter of 1972, we tried to feed fish meal to Xinjiang, Cigai, Polworth and the hybrid ram bred in this farm at three breeding sites in Heka breeding farm, and the effect was good. The feeding method is to mix the fish meal well in the feed. the fish meal contains long-chain polyunsaturated fatty acids, which is a good source of eicosapentaenoic acid and 22 carbon hexaenoic acid. Long-chain fatty acids have great resistance to rumen bacteria. In addition to being rich in protein and more than 50% of rumen protein, fish meal can increase milk production and the protein rate of milk and sheep's milk. another important aspect is that it can inhibit the prostaglandin levels of cows and ewes. It is reported that 30 high-yielding ewes were fed diets of 0pr 2.6, 5.2 and 7.8% fish meal for 42 days. The results showed that the inhibition of prostaglandins in ewes could improve the survival rate of embryos.

The supplementation of more digestible non-degradable proteins in the late pregnancy and early lactation could significantly increase the milk yield in the peak period and 8 weeks before lactation. In most studies, the milk composition increased, especially the milk protein production in the early stage of lactation. In addition, feeding more digestible non-degradable proteins may also increase appetite, and fishmeal is a good source of digestible non-degradable proteins.

Strengthen breeding and selection

Breeding ram selection: choose to breed rams from the offspring of ewes with high reproduction rate. It is required that the body appearance is standard, strong, the testes develop well, and the male characteristics are obvious, and the ram that does not meet the requirements can be found and eliminated through semen quality examination, progeny identification and other measures.

Ewe selection: select excellent individuals from the offspring of multiple ewes and pay attention to their lactation and lactation performance. Multiple ewes can also be selected according to the pedigree.

Utilization of multiple genes

The introduction of prolific breeds and crossing with local breeds is the fastest, most effective and easiest way to improve the reproduction rate of mutton sheep.

Reproductive technology control

Estrus control: first, early weaning of lambs is conducive to the implementation of the technology of two births a year. Second, hormone treatment. Early weaning was performed on lambs, then ewes were treated with progesterone for about 10 days, and then gonadotropin (RMSG) was injected into them after drug withdrawal, which could cause estrus and ovulation. Third, the use of prostatic hormone method. If the ewe is injected with prostatic hormone into the uterus or intramuscularly a few days after the end of estrus, the ewe will be in estrus 2-3 days after treatment.

Induction of twins and multiple births: first, supplementary feeding to induce estrus. Supplementary feeding was carried out one month before mating to strengthen the physique and promote estrus. Second, use double lamb or twin placenta. The water products were subcutaneously injected into the neck of ewes 5 weeks and 2 weeks before mating, respectively, and the oil products were injected into the buttocks muscle of ewes 2 weeks before mating.

Artificial insemination: using advanced insemination technology to improve the conception rate.