Abstract:

In this study, the Eastern Anadolu Red (DAK) was aimed at showing the effect of HCG applied to the levels of progesterone, pregnancy rates and cycle time in non-gravity cows on the 4th day after seed. In the study, 15 head DAK cows of ages 6-8 were used. All animals were injected Prostaglandin F2 alpha twice in the interval of 11 days, and the estruses were synchronized and the animals were seed. After the seed, cows were divided into two groups, including random application of 9 and control of 6. On the 4th day following the seed, the application group injects 1500 IU HCG to cows and 2 ml serum to control group animals. Starting from the seed day, blood samples were taken from all cows in the 4, 7, 10, 13, 16, 19 and 21 days following the seed. Progesterone in blood samples was determined by the double RIA method. The pregnancy of cows was determined by an ultrasound examination in the 45th day. In the 45th day of the ultrasound examination, one animal from the 7 application group was found pregnant. In the comparison of the progesterone values of animals in the application and control group, the difference in the 13th day was significant (p<0.05), and in the comparison of the 19th day progesterone values (p<0.05) and the average values (p<0.05) in the two groups were significant differences. As a result, HCG applied on the 4th day after seminality was found to increase pregnancy rates, but did not affect progesterone levels and the duration of the estrogen cycle.

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