Studies have confirmed that the early mating age of ewes, in general, has no obvious adverse effects on their growth and development, and is very beneficial to production and breeding. First, it can increase life-long production capacity and increase sheep production efficiency. Second, the gap between generations can be shortened to accelerate the progress of genetics and the breeding process. In addition, ewes with early mating have strong maternal and dystocia. Therefore, at present, some countries in foreign countries have set the age of the ewes as early as 6 to 9 months of age, so that the ewes produce lambs at the age of 11 to 14 months, changing the traditional practice of mating in the past from 1 to 1.5 years old. China's early-maturing sheep breeds Small Tail Han sheep and Huyang sheep can be bred from 6 to 7 months of age, and lambs born in spring can be bred in autumn.
The test confirmed that the maternal lamb's early maturation will temporarily hinder the growth and development of the early life stage. However, by the age of the first year, their weights differed little from those of unbred ewes of the same age. When the effects of pregnancy and lactation on the growth and development of female lambs were studied, it was found that, generally, pregnancy did not have a significant effect on the growth of the mother until 120 days. Maternal lambs aged from 7 to 12 months of age are able to slow the growth of the most mature tissue (fat) in the body, but do not adversely affect the growth of the body structure or precocious tissues (nerve, bone, muscle). .
The male lamb's breeding ability and semen quality are generally lower than those of the adult ram. Therefore, when mating with male lambs, the breeding amount should be appropriately reduced. The use of good quality male lambs for sperm mating generally yields good results. The lambs used for early mating, growth and development is better, penis development should be sufficient, testicular development should be normal. The early mating of male lambs is generally 6 to 9 months old. For early maturing varieties, mating at 6 to 9 months is perfectly desirable and beneficial under good husbandry and management conditions.
Factors influencing early lamb mating and lamb production: 1 Body size and body condition at the time of breeding. It is generally believed that breeding can be done when it reaches 65% of mature weight. Therefore, the feeding and management before the initial distribution is particularly important. 2 varieties. When the early maturing varieties reached 6-7 months of age, physical, body and estrus mating all met the requirements for normal reproduction, while late-maturing varieties were worse. 3 Select. By selecting the trait in the puberty period, the population can be set early. 4 The maternal birth time and breeding season affect the conception rate. Research shows that female lambs born in February are best to breed from September to October. 5 Breeding female lambs and adult females in the same group will reduce the fertility of male lambs. Therefore, female lambs and adult females should be grouped and grouped. Using male lambs at the age of one can increase lambing rate of female lambs.
Rongcheng Jingyi Oceanic Technology Company Limited , https://www.jingyifoods.cn