What measures are there to improve the fecundity of sheep in rural areas?

(agricultural get Rich Network) what measures are there to improve the fecundity of sheep in rural areas? -- 1 there are great differences in fecundity among ewes of different breeds of high-quality breeder sheep. For example, the double lambing rate of Hu sheep, small-tailed Han sheep and Landrace sheep of Finland is much higher than that of other breeds, and the lambing rate can reach 200% to 300%. It is also reported that the green goats in Jining, Shandong Province are very prolific, sometimes giving birth to 3 to 5 births per fetus. The fecundity of ewes is hereditary, and the offspring of ewes that give birth to twin lambs will also have this high fecundity. According to the study, the ewes who gave birth to single lambs gave birth to an average of 1.33, 1.31 and 1.04 lambs in the next three births, while the ewes who gave birth to twins gave birth to 1.73, 1.71 and 1.88 lambs respectively. Therefore, the introduction of high-yield breeds for cross improvement, and the selection of their own existing sheep, long-term persistence will improve the fecundity of the whole flock. High-quality breeding rams can be selected by the reproductive performance of their mothers and the determination of their progeny, and must come from the offspring of high-yielding ewes. -2 to improve the feeding level of breeding rams and breeding ewes, the nutritional conditions have a great influence on the reproductive ability of rams and ewes. Adequate and complete nutrition can improve the libido of breeding ram, improve the quality of semen, and promote the increase of ewe estrus and ovulation. The following is an example of raising small-tailed Han sheep. 2.1 the breeding of rams should keep them strong, medium and fat when raising. The forage usually fed should be nutritious and it is recommended to use alfalfa and other high-quality forage. In the non-breeding season, the male sheep mainly grazing were fed with concentrate 0.5kg, hay 2kg, green feed 0.5kg, salt 5g and bone meal 5g every day. Concentrate 0.7~0.8kg was supplemented daily from 40 days before mating, and then increased gradually. During the breeding period, the rats were fed with concentrate 1.2kg, green hay 2.5kg, carrot 0.5~1kg, 3 eggs, salt 5g and bone meal 5g, and grazed properly. Keep exercising for about 2 hours a day and massage your testicles every day. In the non-mating period, the breeding rams were fed with high quality hay 2.5kg, succulent feed 1.0~1.5kg, mixed concentrate 0.8kg, green feed 1.0~1.5kg, mixed concentrate 1.0~2.0kg, 3 eggs, salt 5g and bone meal 5g. 2.2 breeding of ewes under grazing conditions, ewes in empty period do not need supplementary feeding when they are full every day, and some hay can be properly replenished in winter. Ewes in poor condition can be fed in the first 40 years or so to promote their estrus and ovulation. Pay attention to keeping the ewes fat at 7-8 points. In the first 3 months of pregnancy, the fetus develops slowly and does not need supplementary feeding except in the withered grass period. In the second two months of pregnancy, the fetus grows rapidly, and the energy metabolism and material metabolism of ewes are 30% and 40% higher than those during empty pregnancy. At this time, each ewe can be fed with mixed concentrate 0.45kg, green hay 1~1.5kg, green feed 0.5kg and bone meal 5g / day. Attention should be paid to protecting the fetus during pregnancy to minimize stress to ewes. During the lactation period, ewes giving birth to single lambs should be given concentrate 0.3~0.5kg, hay 0.5kg and succulent feed 1.5kg every day. Ewes with twin lambs were fed daily with mixed feed 0.4~0.6kg, hay 1kg and succulent feed 1.5kg. In the later stage of lactation, because the lambs no longer rely solely on breast milk as the main source of nutrition, it is necessary to appropriately reduce the feeding amount of ewes-- 3 whether the structure of the herd is reasonable to maintain the appropriate proportion of ewes in the flock, it has a great impact on the fecundity of the flock. The twin lambing rate of ewes increased with age, reached the highest level after 1-3 years, and began to decrease after 6-7 births. The main reasons for the decline of fecundity of aged ewes are the decline of sexual function, the poor quality of eggs, the decrease of uterine function, the decrease of conception rate and the increase of embryo death. Therefore, increasing the proportion of ewes of appropriate age (2-5 years old) in the flock is an important measure to improve the fecundity of sheep. In sheep breeding farms, the proportion of ewes that can be bred at the right age can be increased to 60%-70%, and in the majority of rural areas, it is generally appropriate to control it at more than 40%-50%. 4. Scientific mating 4.1 the selection of mating season is mainly based on when lambing is most beneficial to the survival of lambs and the health of mother and son. The hot weather in summer weakens the libido of rams and the quality of semen; in winter ewes are in poor condition and are not easy to estrus or have a low conception rate. Most of the selection in our province is carried out only once a year, and in autumn, that is, from October to November every year, and from March to April of the following year. The advantage of this breeding is that when the ewe is pregnant, the birth weight of the lamb is larger because of the better nutritional conditions, and the lamb can eat grass after weaning, so it grows faster and has a strong ability to survive the winter and spring in the first year. In addition to autumn mating, it is also possible to breed in spring, that is, from April to May each year, when mating requires sufficient forage and fodder to store in winter and prepare a well-insulated sheep house. 4.2 Scientific breeding methods there are two breeding methods for sheep, namely, natural mating and artificial insemination. Natural mating is the most primitive method in raising sheep, which is the mixed grazing of rams and ewes in the breeding season. It saves labor and does not need equipment. However, the application of this method has many adverse effects on the fecundity of the whole flock, due to inbreeding, do not understand the blood relationship of sheep, which brings difficulties to the selection and matching in the future, and will produce a lot of malformed fetuses, which directly reduce the fecundity of sheep. Artificial insemination can effectively improve the above shortcomings, it can expand the utilization rate of excellent rams, improve the conception rate of ewes, and is of great help to improve the fecundity of sheep. If artificial insemination is not carried out, artificial auxiliary breeding can be used, that is, male and ewes are grazed in groups, ewes are tested every day during the breeding season, and then ewes in estrus are mated with designated rams, which is conducive to sheep selection. 5 to strengthen the level of management before and after delivery, various utensils should be disinfected prenatal, and the tail root, vulva, anus and breast of ewes should be disinfected with 1% Lysol or 1 ‰ potassium permanganate solution. After giving birth, the short umbilical cord was 5-8 cm away from the lamb's umbilical nest and disinfected with iodine tincture. If there is a fake dead lamb, lift its hind legs in time, slap it on the back, or let it lie flat, and press its chest rhythmically with both hands to revive it. When dystocia occurs, artificial midwifery can be carried out after checking its fetal position, otherwise find a veterinarian to carry out caesarean section. Let the fetus eat colostrum in time after giving birth, start eating early, train to eat grass, expel meconium and enhance gastrointestinal peristalsis. The resistance of newborn lambs is poor, so nursing care should be strengthened. If the ewe does not have enough milk, it is necessary to adopt artificial lactation or foster care in time.