First, the cow signs of pregnancy after mating, no longer show estrus, docile temperament, increased appetite, fat hair, usually can be considered pregnant. Such as vaginal examination, cows one month after mating, when the opener inserted into the vagina, the resistance is obvious, there is a sense of dryness, vaginal mucous membranes pale, dull, uterine mouth biased to one side, was closed, the upper was dark thick mucus Plug closed, that is pregnant; if 20 days after the cow mating, the application of ethylene diethylstilbestrol injection 10 mg, an intramuscular injection, no estrous performance of pregnant cows, non-pregnant cow was estrus on the second day. Such as rectal examination, intestine touching the uterus without response, or contraction of the right uterine horn, gestation angle is slightly larger than the empty angle, this is the cow has been pregnant for a month; if the uterine horn becomes short and thick, like a thick electric torch, soft as a water bag There is a clear corpus luteum in the memory of the ovary. This is 40-50 days of pregnancy. If the uterine horn is a large sac, it is 3 months pregnant.
Second, the method of pregnancy for pregnant cows
To strengthen the feeding and management of pregnant cows to meet the nutritional needs, especially proteins (cakes and fish meal, etc.), to ensure supply, to add vitamin A and vitamin E; winter and spring seasons lack of green feed can be fed malt or silage; also It is necessary to supplement bone meal to prevent cows and yaks from suffering from osteomalacia; pregnant cows should exercise properly, be frightened, whipped, slid, shuffled, relieved of military service, be forced to stop working for one month before birth, and single-fed and kept ready. Production.
Third, correctly identify the signs and delivery date of pregnant cows
Two weeks before delivery, the breasts of the pregnant cows begin to enlarge. From the front, two nipples can be squeezed out of the yellowish, honey-like viscous liquid. The labia is swollen. It flows from the vulva 1-2 days before delivery. Outside the vulva, the muscles on both sides of the tail root collapsed. The external appearance of the cow before delivery: When she was lying up, she frequently excreted urine and looked back at the abdomen and felt uneasy. If there is a breeding record, the delivery date can be calculated based on the 285-day period of the cow's pregnancy. The method is to subtract 3 from the breeding month and add a date of 10, such as breeding on May 11, 5-3=2 (months) and 11+10=21. (Day) is the delivery on February 21 of the following year.
Fourth, the right production
During the maternity period of the cows, special personnel should be assigned to watch and work, and the confinement work should be completed. The maternity cows should be provided with clean, dry grass and a quiet environment. Generally 10-20 minutes after the membrane blebs are exposed, the cow is lying down under more than one position, so that it is lying to the left to prevent the fetus from being difficult to produce by the rumen pressure. The fetus's front hooves breaks the membrane and the amniotic fluid (fetal water) is required. With a bucket, use it to feed the postpartum cows with 3.5-4 kg, which can prevent the retention of the tires. In normal production, the two forelimbs are clamped together and the first comes out. If dystocia occurs, the fetus should first be pushed back into the uterus to correct the fetal position. In retrograde, when the two hind legs are produced, the fetus should be pulled out early to prevent the fetus from entering the birth canal and the umbilical cord may be pressed against the pelvic floor, causing the fetus to suffocate and die. The cows are shrinking and their duties are weak. They should be given a midwifery. The sterilized ropes are used to tie the two forelegs of the fetus. The assistant hands them on. The midwife's hands reach into the birth canal and the thumb is inserted into the corner of the fetus, and then the jaws are pinched. When the cows blame, pull them together and force them slightly back towards the bottom of the cows. When the fetal head passes through the vulva, one person covers the cow's labia and perineum with both hands and avoids bursting. Pull out the fetal head, continue to pull the action to be slow, so as not to occur uterine engorgement or prolapse, when the fetus abdomen through the vulva, hand choke the umbilicus of the fetus to prevent the umbilical cord broken in the umbilicus, and extend the umbilical time For the fetus to get more blood.
5. Carefully manage the birth of a newborn calf in a newborn calf. Immediately wipe the mouth and nose mucus with a dry rag or hay to facilitate breathing. If suspended animation (the heart is still beating) should immediately pick up the two calf hind limbs, pour out of the amniotic fluid in the throat, and artificial respiration, the umbilical cord self-disconnected, fully sterilized with 5% iodine in the broken end, can be from the abdomen when not broken 6-8 cm cut (scissors to be disinfected), and then fully disinfected, without ligation, in order to facilitate drying. To prevent contamination, gauze can be used to wrap the umbilical cord. In the winter, the mucus on the yak body should be wiped off and the umbilical cord should be treated (when the weather is warm, the cows can be drained after the umbilical cord is broken). Strip the soft hooves, weigh them, and number them (for cattle farms or specialized households). When a yak wants to stand, he should help him to stand and artificially feed colostrum.
VI. Feeding management after cow delivery
1. How to drink: Feed the cow's warm bran bran soup: bran 1500-2000 g, salt 100-150 g, add brown sugar and water, warm and feed. And remove the stained grass, replace it with clean grass, feed the cow hay or fresh grass, and let the cow rest.
2, Qingtu clothing: timely removal of the placenta after discharge. If the placenta is left over for more than 24 hours, surgical dissection should be performed.
3. Rows of lochia: cows' lochia after birth is a normal phenomenon. Because the uterus has its own purification ability, under normal circumstances, it is not necessary to wash the vagina and uterus with medicine. If the lochia is gray-brown and smells odor, and the discharge days exceed 21 days, rectal examination or vaginal examination should be done. The uterus can be washed with anti-inflammatory liquid.
Seven, pay attention to cow postpartum estrus. Most cows have no obvious estrus symptoms on the first and second postpartum, and they are not easy to see. Therefore, we must pay attention to the performance of cow estrus and changes in cow genitalia, sexual excitement and sexual desire 15-20 days after childbirth. If estrus does not occur 45-60 days after childbirth, the health, nutritional status, ovaries, and uterus of the cow must be examined and treated to ensure timely mating.
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