Prevention and treatment of recessive abortion in breeding Dairy cows within two months of pregnancy

The phenomenon of recessive abortion in dairy cows within 2 months of pregnancy often occurs, which is a loss to the cattle industry, which should be paid great attention to by the majority of cattle farmers. 1-2 months after mating, the pregnancy was confirmed by examination, followed by estrus, and then disappeared after examination of the original pregnancy, that is, recessive abortion. After the early blastocyst and embryo death, the tissue liquefied, absorbed by the mother or excreted with urine during estrus, is not easy to be found. cattle farmers mistakenly believe that it is caused by the technology of breeding personnel and the quality of semen used, resulting in a lot of trouble. In order to prevent recessive abortion of dairy cows in production, the following work should be done well.

To strengthen nutrition, dairy cows should be given nutritious and comprehensive high-quality feed rich in vitamin A, vitamin B2, vitamin B12, minerals, trace elements and so on, so as to prevent the fetus from dying midway due to insufficient nutrition or nutritional imbalance and maintain normal pregnancy. to ensure the normal development of early embryos. At the same time, put an end to feeding cow single feed or frozen, moldy feed, as well as poisonous feed such as potatoes and cottonseed cakes.

Careful pregnancy test when conducting pregnancy tests on mating cows, care must be taken. In the early stage of pregnancy, the embryo is in a free state, or does not combine closely with the maternal uterine mucosa, at this time, if the pregnancy test is not careful, rough action, it may cause embryo death, implantation is not successful. Especially when rectal examination, should be gentle, so as not to damage early embryos, resulting in artificial abortion.

Perfect management to create a good living environment for pregnant cattle. Cows after mating should be raised in a single house if possible, so as to avoid the adverse effects of contradicting each other and crowding on embryos; intense activities should be avoided; do not stretch across the trench, fall on the ice track, whip, kick, eat and drink loudly, etc.; breeders are not allowed to frighten or beat cows; give sufficient clean drinking water and do not drink frozen cold water in cold seasons; pay attention to the cleanliness of cattle and the environment. Don't overeat or overwork.

Strengthen disease prevention and control to effectively prevent and control tuberculosis, salmonellosis and brucellosis which can cause abortion. Livestock without disease shall not be introduced from the epidemic area; if necessary, it should be introduced from the disease-free area, and quarantine and breeding should be carried out under the condition of isolation, and the herd should not be mixed until disease-free is determined. Quarantine is carried out regularly every year, and sick cattle are eliminated in time. The cows were vaccinated with attenuated Brucella vaccine 1-2 months before mating. Breeders, milkers and veterinarians should have regular check-ups, and patients with tuberculosis should not come into contact with cattle. Strengthen the cleaning and disinfection of herds and environment, often pay attention to cow hygiene, carefully brush, especially to maintain pregnant cow abdominal hygiene, to prevent the occurrence of vaginitis and uterine inflammation.

Two months after mating in time, the cow should be checked in time to find that the abortion should be replenished as soon as possible to avoid the empty pregnancy time is too long, resulting in the reduction of cow reproduction rate and affecting the economic benefits of breeding.

In the early stage of pregnancy, progesterone should be injected to protect the fetus, once a day, 50-100 mg each time, once every other day, 3-4 times.

Note that taking a large number of drugs after pregnancy may cause abortion in cows, including laxatives such as sodium sulfate and magnesium sulfate, antipyretic analgesics such as quinine sulfate, cholinergic analgesics such as carbamylcholine, pilocarpine nitrate, trichlorfon, excitants such as strychnine hydrochloride, accidental administration of uterine contractile drugs, such as oxytocin, and aphrodisiac drugs such as diethylstilbestrol, prostaglandin, etc. Antihypertensive drugs, glucocorticoids, such as cortisone acetate, hydrocortisone, dexamethasone, etc., and other drugs that are contraindicated in pregnancy.