There are many reasons for cow abortion, including genetic factors, environmental climate factors, endocrine factors, diseases and feeding management. Here, we will focus on the factors of feeding and management.
(1) feeding. Poisoning caused by feed spoilage and fermentation can make cows miscarry. Low-level feeding of dairy cows in the second trimester of pregnancy can also cause abortion, because the sensitivity of the fetus to various external conditions is improved during this period, that is, it is in the susceptible period, and the sensitivity of the close connection between the mother and the fetus placenta is stronger. At this time, if there is no nutrition, it will inevitably affect the growth and development of the fetus, and in severe cases, it will lead to embryo death or abortion.
(2) management. After external stimulus (such as climate change, cold stimulus, etc.). ), mechanical compression, and stress stimuli such as falls and injuries, the level of corticosteroids in blood milk rises rapidly, which will also lead to miscarriage of dairy cows. Every year, quarantine, vaccination, throwing magnets, and maintenance of cow's hoof in late spring and early summer will cause different degrees of stress to pregnant cows, which will lead to abortion in severe cases.
(3) Other factors. Poor disinfection or pollution of semen, insemination equipment and thawing solution. And less difficult artificial insemination techniques (such as rude fetal examination and improperly matched pregnant cows). ) can lead to miscarriage.
Prevention of abortion is mainly to pay attention to the feeding and management of dairy cows. Usually, we should pay attention to the hygiene of cattle, avoid sharp changes in feed types, feed formulas and feeding management methods, and step by step. The exercise of dairy cows is necessary in the third trimester, but it should not be too intense.
Pregnant cows should be fully supplemented with nutrition, keep healthy and enhance their resistance. For habitual abortion, we must first find out the period of abortion and give placental gonadal hormone or progesterone continuously to prevent the recurrence of abortion.
We should pay attention to the hygiene of artificial insemination room, firmly establish the viewpoint of aseptic operation, and strengthen the hygiene management and supervision of artificial insemination technology.
Adjust the mating season properly, control the first mating time during the high temperature in summer, and breed at night as much as possible. This is because the mating pregnancy rate of dairy cows in summer is very low, and the survival rate of early embryos is also very low, which is prone to premature death or abortion.