:LH response to synthetic LH-RH analog in the cow with follicular cysts
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概要
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Serum LH levels were determined by radioimmunoassay on samples collected from cows with ovarian follicular cysts and from normal experimental cows.<BR>Blood samples were collected from 40 dairy cows when their ovaries were diagnosed as cystic. Eighteen cows of them were injected intramuscularly with 300 μg and 200 μg LH-RH analog at 90 minutes interval.<BR>In 17 cows of them blood samplings were performed again at the 2nd injection. In one remaining cow the samplings were frequently done till 720 minutes after the 1st injection (Table 1).<BR>In a normal exprimental cow serum LH levels were measured through 3 estrous cycles, and in 2 experimental cows LH responses after the LH-RH analog injection were observed (Tables 2 & 3).<BR>Serum LH levels in cows with ovarian follicular cysts [6.3±1.1 (SE) ng/m<I>l</I>] were higher than those in estrous cycles except estrous periods in normal experimental cows [1.9 ± 0.1 (SE) ng/m<I>l</I>] (Table 4).<BR>In cows with ovarian follicular cysts, serum LH levels increased significantly (p <0.01) 90 mi-nutes after the LH-RH analog injection (Fig. 1). The LH responses after the LH-RH analog injection in cows with cystic ovaries seemed to be similar to the pattern of preovulatory LH surge in normal experimental cows (Figs. 25).<BR>From these results, the mechanism of recovery from ovarian follicular cysts by the LH-RH analog administration is supposed as follows: serum LH levels were increased over a certain thre-shold and maintained for a while, and then luteinization of cystic follicles was induced.
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