During the breeding process of beef cattle, cow abortion will bring serious economic losses to beef cattle breeding. There are many factors that cause abortion in pregnant cows, including nutritional deficiency, mechanical damage, stress abortion, hormone disorders, spontaneous abortion and drug effects. In the process of beef cattle feeding and management, we should do a good job of protecting the fetus of pregnant cows to prevent the occurrence of cow abortion.

The lack or imbalance of nutrition is the main reason for the abortion of pregnant cows. The extensive feeding management and the feed supplied to cows are too single, which often leads to the lack of certain nutrients or the imbalance of nutrition intake, resulting in the weakness and emaciation of cows and the decline of resistance. As a result, the fetus does not get enough nutrition to meet its growth and development needs. In addition, the lack of vitamins in the cow's diet, such as vitamin A, vitamin E, vitamin D and the lack of certain trace elements, such as calcium, phosphorus, iron, cobalt, etc., will not only hinder the development of the fetus, but also lead to reproductive organ disease or reproductive-related hormone secretion disorders and cause abortion.

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1: Solve the problem of maternal reproduction (e. g. long interbirth time, repeated infertility, frequent miscarriage)

2: Prolonged peak lactation; increased milk production.

3: Extend the useful life of female animals; (one annual production8,000 liters of cows lost in their milk production60 kg of minerals)

4: Improve the comprehensive health index of dairy cows and reduce the incidence of dairy cows (e. g. mastitis, hoof disease).

5: Cow pica disappears (gnawing wood,Licking hair,Licking urine,gnawing plastic), with smooth fur.

6: Promote food digestion, improve feed utilization, save concentrate.

In the process of beef cattle feeding and management, such as sports, grazing and other activities, or the cowshed is too crowded, it is very likely that crowding, falling, sliding, sudden fear or fighting between cattle will occur, which can easily lead to mechanical damage and abortion of pregnant cows.

When the ambient temperature is too high, the cow will produce heat stress, and show loss of appetite and accelerated breathing rate, which is the main reason for the high abortion rate of cows in summer. In addition, when pregnant cows suffer from severe adversity, it will cause uterine reflex contraction and abortion.

Due to feed management is not in place, such as improper storage of feed lead to feed mildew, feeding pregnant cows, mycotoxins will produce toxic effects on the embryo and cause abortion. Feeding pregnant cows frozen forage, drinking cold water or water with ice residue will cause sudden abnormal contraction of the cow's uterus and cause abortion. Treating cows too rough when grazing or exercising, making pregnant cows walk up and down steep slopes and slips, all of which can easily lead to miscarriage.

During the whole pregnancy, progesterone and a certain proportion of estrogen can make the uterus proliferation, to ensure that the embryo can normal colonization and development. Progesterone can also make the cervix secrete mucus to form a uterine plug, which can effectively prevent abortion. If the secretion of progesterone is reduced, it will lead to abortion.

One kind of spontaneous abortion is due to fetal villi or chorionic hypoplasia, so that the fetus can not get adequate nutrition, so that the fetus can not normal growth and development, resulting in pregnancy interruption. The other is due to inflammation in the endometrium. When the fetus gradually grows up, the villi on the chorion cannot be combined with the site of inflammation in the endometrium, which hinders the exchange of nutrients between the fetus and the mother, causing the early death of the embryo. Out of the body.

Some treatments and the use of health drugs can cause abortion in pregnant cows, such as some drugs for diarrhea, corticosteroids, anesthetics, and uterine contractions. In addition, vaccination of cows during pregnancy is also a major cause of miscarriage.

Disease factors are the main cause of abortion in pregnant cows. Especially when cows suffer from reproductive organ diseases, they are easy to cause abortion. When pregnant cows are exposed to bacteria, fungi, viruses and parasites, they are also prone to miscarriage.

In order to reduce the incidence of abortion of pregnant cows and reduce the economic losses of beef cattle breeding caused by abortion, breeding personnel should take effective measures to protect the fetus, carefully feed pregnant cows, and do a good job of protecting the fetus to ensure the normal and healthy growth and development of the fetus in the mother, prevent or reduce the occurrence of abortion, and produce healthy and energetic calves.

To master the nutritional supply of cows. Generally, cows have a strong appetite after pregnancy and are easy to get fat. In the early stages of pregnancy, cows are susceptible to external influences and have abortions. The feeding and management of cows in the first 1 to 2 months of pregnancy is to ensure the normal growth and development of the fetus. Critical period, therefore, it is necessary to strengthen the feeding and management of this stage. It is strictly forbidden to feed pregnant cows with spoiled, moldy or toxic feed to prevent pregnant cows from causing early poisoning and death of embryos after feeding. At the same time, it is necessary to provide sufficient and nutritious diets for cows, and to ensure that various nutritional elements such as protein, energy, vitamins, minerals are sufficient and balanced, otherwise it will cause the fetus to stop developing in the middle.

After the cow is 3 months pregnant, the speed of fetal development is accelerated, and the feeding amount of concentrate is appropriately increased to meet the demand for nutrients for the rapid growth and development of the fetus. For young cows, the feeding amount of concentrate should be increased, because the supply of nutrition at this time should not only meet the growth and development of the fetus, but also meet their own development.

After 6 months of pregnancy in the mother's year, the principle of feeding less frequently should be followed. The two months before delivery of the cow is the fastest stage of fetal growth and development. The weight of the fetus can reach 60% to 70% of the weight at birth, so the demand for nutrition increases. In addition, the cow also needs to reserve some nutrition for postpartum lactation. The feed should be fresh and varied, and more green and juicy feed can be fed. The feeding amount of roughage should be controlled in the one month before delivery of the cow, and more green and juicy feed can be fed. Bran can be added to the concentrate to prevent constipation.

Strengthening the management of cows during pregnancy is an important measure to ensure the normal development and delivery of the fetus. In the early stage of cow pregnancy, the combination of fetus and mother is not complete, and abortion is very easy to occur at this stage. Therefore, attention should be paid to prevent cows from rushing and crowding when grazing and exercising.

In the 5~6 months of pregnancy, the cow should be properly exercised to prevent fetal abortion. It is not easy to graze or go out for exercise in hot and cold weather. The last month of pregnancy is a more critical period. When grazing, you should pay attention not to let the cows walk through steep hillsides and rugged mountain roads to prevent mechanical abortion. The environment in the cattle house should be kept clean, ventilated and dry, with sufficient light, and the manure in the house should be cleaned up in time and the bedding grass should be changed frequently.

Cows should be careful not to crowd when entering and leaving the barn. For cows near delivery, the symptoms of delivery should be observed at all times so as to arrange delivery work in time.