Nanjiang Yellow Sheep have strong fertility and can improve other goats to increase fertility. For instance, in the Daba Mountain area, the southern Yellow River male parent mates with the Bashan local goat, and the litter-laying rate increases by 3.55 percentage points to 196.36%, which is 2.6 percentage points higher than that of the Dalashang Maogao goat and reaches 187%. The survival rate of improved lambs has also increased. For example, the survival rate of two-month-old lambs in Daba Mountain increased by 2.86%, while that in Wuling Mountains increased by 22.00%, reaching 91.35% and 97.67%, respectively. Although the basic characteristics of high reproduction of meat goats were shown, the following basics should be mastered in breeding and improvement techniques. Points.
First, breeding technology:
1. Male rams should be selected from individuals who are born with multiple lambs and who are well developed.
2, breeding age, with the variety and growth and development may be, Nanjiang Huangyang Ewe to 8 months of age, about 25kg breeding conception, rams 18 months of age, about 40kg formally group breeding appropriate.
3. During the mating season, although Nanjiang Huangyang has the characteristics of annual estrous mating and distribution of litter size, it should be based on the species and natural climate conditions. It is best to follow the breeding rules of goats, and it is better to breed in spring and autumn. , and pay attention to shorten the interval between production and distribution, and strengthen breeding and management of ewes, especially rams.
4, the correct use of mating methods, in the absence of artificial insemination technology, it is best to use artificial auxiliary breeding method, that is, the species of ram kept alone, the sheep estrus estrus implementation of the group; for free sheep, prohibited public, The master mix group freely mates.
5. The breeding time is about 24 hours after the estrus of the ewes (ie, the occurrence of estrus symptoms or the start of ramming), and breeding in the morning before the grazing is the most suitable breeding time.
6, the number of breeding, with intervals of 8 - 12 hours in the morning and evening two breeding is appropriate.
7, estrus diagnosis, you can use the test method, that is, in the mating season before every morning grazing to the breeding ewes into the trial ram to accurately diagnose the estrus.
8, timely diagnosis of pregnancy, after the match with a strike around the outflow of white mucus from the vulva, an estrus cycle (about 20 days) no longer heat, about a month vulva drying shrinkage, and out of transparent yellow mucus, then the ewe Increase, appetite, and so on, for the basic characteristics of pregnancy. Unwed pregnant ewes in time for compounding.
Second, nursing care points:
1, miscarriage: For pregnant ewes, especially in the late pregnancy, should pay attention to increase nutrition supply, prevent extrusion, tend to fight.
2. Husbandry: The ewes are grazing in the first half of the first half of their lives and are bred in a single lap at night or entered into the lamb stalls. Raising nutrient concentration and feeding volume should be improved, but it is necessary to reduce the amount of meat before delivery.
3. Midwifery: Goats, as long as they are breeding at the appropriate age, do not appear difficult to produce, but special guarding during winter lambing, attention to thermal insulation in winter; artificially assisted lambs in time to eat milk, and appropriate after delivery Raising the nutritional supply of ewes, lambs can be bred with ewes near a high quality pasture after one week of birth. To adopt captive means, we must not neglect the early feeding of lambs.
Third, improve the technical points:
1. The directions and objectives for improvement should be based on the local physical and geographical conditions and socio-economic conditions and the basic condition of the sheep.
2, the choice of varieties, if to improve the meat performance as the direction of improvement, development of commercial sheep production as the goal, Nanjiang Huangyang is the best choice for the species. However, the improved female parent varieties should also be selected preferentially (including individual preference), and the determination of species selection should be made through determination of combining ability.
3, the use of improved sheep. The hybrid male rams and most ewes obtained from the Nanjiang sheep as their male parent should be used as commodities, and the minority of excellent individual ewes can be selected for near-hybrid (or three-way hybrid) use; the second-generation improved sheep All should be used for commodities, but special individual rams can be selected for use as crossbreeding fathers.
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