Abstract

Changes in the ovaries were monitored every 2 to 3 weeks using real-time ultrasonography as part of regular reproductive checkups in 178 multiparous and 109 heifer (total 287) cows which had been diagnosed as having follicular cysts (77 cows) or ovarian quiescence (210 cows) and treated once with gonadotropin-releasing hormone, GnRH (fertirelin acetate at 100 μg i.m.). Following the one-time treatment, 96 cows (33.4%) showed estrus and underwent artificial insemination by the next reproductive checkup (Cow AI), 87 cows (30.3%) were given dinoprost as prostaglandin F_2&alpha (PG) to induce estrus at the next checkup because of existence of Corpus Luteum (CL) in their ovaries (Cow PG) and there was no change (no effect) in the ovaries of 104 cows (Cow NE, 36.2%). The number of cows which conceived during the estrus cycle following injection of GnRH was 39 (40.6%) in Cow AI and 38 (43.7%) in Cow PG. In conclusion, one-time GnRH administration to cattle with ovarian cysts or quiescence but without CL at a regular reproductive checkup may effectively shorten the time to conception.

Keywords:

Cystic ovary, GnRH, ovarian quiescence, return of estrus, ultrasonography,

References

Competing interests

The authors have no competing interests.

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