The young females are usually exposed to heat for the first time from 6 to 12 months of age. At this time, the estrus duration is short and the cycle is not normal. The reproductive system and its function are still in the stage of growth and development, and it is not suitable for breeding calves. Males and females have had fertility during the sexual maturation period of 8 to 12 months, but at this time the body is in a vigorous stage of growth and development. If mating and conceiving, it will affect their growth and development and breeding in the future. The useful life will be shortened and the offspring's vitality and production performance will be low. Therefore, it is not appropriate to breed at this time, and care should be taken in production to avoid random distribution. Vitamin B1 Hcl,Vitamin D3 Oil,Vitamin D3 Powder,Bulk Vitamin E Powder Ningbo Nutrition Food Technology Co.,ltd. , https://www.collagenworkshop.com
Early mating of cows will affect their own health and growth and development. The yak is of weak constitution, small birth weight, and difficult to raise. Cows are affected by postpartum milk production. Therefore, the correct age of male and female cows should be correctly grasped. It is of great significance to improve the quality of cattle, give full play to its production performance and increase reproduction rate.
The growth rate of each organ after birth was basically the same, but the growth rate of reproductive organs accelerated at the age of 6 months and gradually entered sexual maturity. At this time, the eggs in the mother's ovary can be mature, can secrete sex hormones, have sexual desire and estrus performance, can ovulate, enter the puberty period. The cows at this time can mate, fertilize, and complete the pregnancy and embryonic development process.
However, the puberty cow is only the sexual organs begin to mature, but also need to go through the development of the pituitary gland, ovary, uterus, etc. to achieve full maturity, then the cow's entire body development will also mature. Generally cattle 20-30 months of age to reach maturity, you can arrange the first breeding, also known as the initial allocation. In the production of the first breeding (initial allocation) period, based on physical development, age is for reference only. In general, local cattle weight 180-210 kilograms, the modified cattle can be in the 250-280 kilograms when the initial allocation.
So how old is the cow to start breeding? It depends on its maturity. Males and females generally grow at the age of 2-3 years and reach the maturation period when they can breed. According to experience, the initial maternal age of female cattle is 1.5-2 years old, male cattle is 2-2.5 years old, and the introduction of male and female cows 1.5-2 years old is appropriate. Specifically, the individual's growth and development status should be determined. Adult cows should be used as the standard. When the individual's weight reaches 65%-70% of adulthood, the body reaches 90%, and the chest circumference reaches 80%, the initial matching age is appropriate. the best.
The best breeding time for heifers