Increasing Pregnancy Rate by Fixed-time Artificial Insemination Technique in Beef Cattle, Si Sa Ket Province
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Abstract
The objectives of this research were to study reproductive problems in cattle farming and to increase the pregnancy rate in postpartum beef cattle of farmers in the sustainable cattle farming community enterprise network, Si Sa Ket Province, using a fixed-time artificial insemination technique. This research was divided into two experiments as follow: Experiment 1, The survey on reproductive problems encountered in the beef cattle herds of farmers, by interviews of 100 beef farmers with 450 beef cattles, using descriptive statistics, on reproductive problems affecting the production of beef cattle in the beef cattle herd of farmers. Experiment 2, 26 crossbred Bos taurus and 170 crossbred B. indicus beef cattle (> 20 months old) were used to increase the pregnancy rate in postpartum cattle herd using fixed-time artificial insemination technique. Cows were in good health, no reproductive disorders, and had a complete ovary through examination of the reproductive system by rectal palpation and ultrasonography. Cows were synchronized estrus and fixed-time artificial insemination with P-sync protocol. At the time of fixed-time artificial insemination, cows were divided into 4 group according to follicle size: < 4.9 mm, 5.0 - 7.9 mm, 8.0 - 10.9 mm, 11.0 - 13.9 mm, and > 14 mm in diameter. The mean and percentage were analyzed in a Lee-squared style using the mixed follicle size. In pregnancy rate percentage of all pregnant cattle as a reproductive index, it was found that cows with a follicle diameter of 11.0 - 13.9 mm had a higher pregnancy rate than beef cows with a follicle diameter of 8.0 - 10.9 mm (P < 0.05).
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