The autumn weather is cool, the forage is abundant, the feed is adequate, the bull is energetic, and the cow has a short estrus cycle and long duration. It is the golden season for breeding. Therefore, it is recommended that cattle farmers should seize the opportunity to breed cows in a timely manner. The author summarizes the management measures of this period as "four catches":
1. Grab the fall. Prior to the mating period, cows of the right age should have a moderate body condition, and neither over- or under-weighting are conducive to breeding. For poorer cattle, the proportion of compound feeds can be properly adjusted, mainly by increasing nutrition and increasing the number of feedings, and feeding sufficient grasses to allow the cows to be estrus in the short term. However, it should be noted that the balance of nutrition must be properly prepared at the usual time, and excessive obesity caused by excessive intake of protein and energy feed should be avoided so as not to affect the quality of breeding.
2, grasping aphrodisiac. In order to ensure that the cows are able to heat in the best conception period, and the conception rate is increased, acne measures may be appropriately taken for cows that are not estrus. 1 With estrus bulls chase non-estrus cows, inducing estrus in cows. 2 For estrogen injection of non-estrus cows, 25-35 mg of diethylstilbestrol, 40-60 mg of diphenol ethane, or 3-5 g of triple lignin can be used. Cows can be estrus after injection. . 3 Chinese medicine aphrodisiac, the specific method is: Motherwort 30 grams, 24 grams of pumpkin leaves, 15 grams of safflower, Jianshui gavage cattle, cows can be estrus mating pregnancy.
3, grasping and breeding. After estrus in cows, the common loss of appetite, excitement, cross-over, often urinating position, low urine output, flushing of the vulva, congestion, swelling, micro-open, often accompanied by white translucent mucus outflow, touch the cow at this time The buttocks, high tail oxtail, quiet, two hind legs open for mating action. After the appetite gradually recovers, the libido declines, the vulva swelling gradually subsides, and the mucus is small and thick. For rectal examination, the estrus is in the follicular maturation stage or ovulation period. At this time, it is most suitable to breed or inseminate the cow. Artificial insemination is an important technique for improving the conception rate of cows, especially the rectal grasp method. During operation, insert the vas deferens flatly into the cervix 5-7 cm, then slowly inject the semen. After the insemination is completed, slowly pull the vas deferens to prevent damage to cow vagina or semen.
4, grasp management and protection. 1 Do not allow the cow to exercise vigorously within 2 hours after breeding, avoid drinking or eating too much. 2 During the 15 days after mating, feeding was performed at night, and 1-1.5 kilograms of bran was fed to give clean drinking water containing a small amount of salt to promote fertilized egg implantation. 3 During the cow's pregnancy, feeds containing protein, vitamins, and minerals are supplied to suit cow growth and the need for fetal, placental, and uterine growth. 4 It is strictly prohibited to feed moldy, frozen, toxic, and acidity feeds to prevent enteritis, miscarriage, weak or stillbirth. Beware of miscarriages caused by overt shocks, collisions, and other external factors.
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