First, strengthen the feeding and management, improve the nutritional status of cows, and maintain proper sensation. Breast-feeding cows should be properly weaned and the body should be restored as soon as possible. Second, the post-natal estrus or long-term estrous cows, with progesterone, progesterone can also be used intramuscular injection of 50 mg daily, after stopping the injection of pregnant women serum 2000 units, you can cause cow oestrus ovulation. Third, vinegar irrigation method. Before the breeding of cows, about 0.5 to 1 kg of vinegar is fed to help the cows to promote ovulation through stomach acid and good digestion, and to receive sperm. After adding the seeds, the same amount of vinegar is used for the same dose, which also helps the cows to receive sperm stably. Fourth, irrigation brown sugar law. The method is to irrigate about 0.5 kg of brown sugar before and after the breeding, pour it into water-soluble solution, and wait for it to cool before filling. The above method is for test reference.
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