According to investigations, the majority of abortions occurring in dairy cows are universal abortions. The main reasons for universal abortion are the following aspects.
1. Nutritional abortion: Many farmer households perform extensive feeding on dairy cows, especially when the cows are in rough-feeding during the dry period. As a result, cows are thin and the fetus is not given enough nutrition. This causes abortion of pregnant cows; Single feed, lack of vitamin A, E, D, minerals (micronutrients), etc., resulting in difficult to fetal development and reproductive and reproductive organs of female reproductive organs disorders and hormone secretion caused by miscarriage.
2. Mechanical abortion: Due to the extensive management of dairy cows, cows often clash and crowd each other; humans are rudely driven away; beating pregnant herds; brute-type rectal examinations; sports fields and cowshed are too slippery to cause cow abortions.
3. Feeding cattle with mildewed fodder: If mildewed corn contains zearalenone, cows may become miscarried; distiller's yeast that feeds cows during late gestation may cause gravid cows to produce weak yak or Under the blind yaks; cows fed sunflower seed cake excess, easy to interrupt pregnancy, discharge of stillbirth; to feed frozen feed to dairy cows, can easily cause uterine smooth muscle contraction, resulting in pregnancy abortion.
4. Stress reaction causes miscarriage: long-distance transportation of dairy cows; the environment of the cowshed is excessively humid, crowded and stuffy, and when the temperature is above 30°C, cows are prone to heat stroke. Under strong sunlight, cows are susceptible to heat shock and cause miscarriage.
5. Disease abortion: Heart, lung, liver, kidney and intestinal diseases of cows, severe hemorrhage, diarrhea and hernia are easily caused by pregnancy abortion.
6. Medical abortion: taking diarrhea medicine, corticosteroid medicine, anesthetic, anthelmintic drugs, diuretics, sweating drugs, etc. are easy to abortion of pregnant cows.
7. Spontaneous abortion: abnormal placenta in pregnant cows, hypoplasia of chorionic villi, degeneration of the villus, so that the fetus can not get enough nutrition, resulting in interruption of pregnancy; maternal membrane edema and polyhydramnios in pregnant cows due to partially reversed membranes or Maternal blood circulation disorders caused by the fetus can not normal development caused by miscarriage; premature embryonic death, due to unhealthy sperm and eggs, progesterone deficiency, maternal diseases and harmful factors, lack of protein in the feed or excess, immunity is not consistent with the other are likely to cause pregnancy Cows have a miscarriage.
8. Hormone-disordered abortion: progesterone and a certain proportion of estrogen work together to make embryonic development, excessive estrogen or progesterone reduction are likely to cause miscarriage.
9. Miscellaneous factors causing miscarriage in pregnant cows: 1 Cow suffering from miscarriage of infectious diseases, such as brucellosis, leptospirosis, vibriosis, viral diarrhea, infectious tracheitis, fungal abortion, chlamydiasis , Listeria, epidemic fever, etc. 2 Parasitic abortions, such as trichomoniasis, sarcoplasmosis, and neosporosis.
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