Abstract
Previous studies have compared the effectiveness of dinoprost and
cloprostenol in cows yielding conflicting results. The aim of our study
was to evaluate the efficacy of single treatment with cloprostenol or
dinoprost on estrus and reproductive performance in cows with unobserved
estrus after service. The study was conducted over four years in two dairy
herds of Polish Holstein Frisian cows under a herd health program with an
average milk yield per cow over 9000 L. Cows (n=523) diagnosed
ultrasonographically as non-pregnant and with a corpus luteum were
randomly assigned to be treated with either cloprostenol (n=261) or
dinoprost (n=262). The estrus detection rates after administration of
cloprostenol or dinoprost were 59.4%, and 57.6%, respectively. The
difference between both groups was not statistically significant (p>0.05).
Distribution of observed estrus did not differ between cloprostenol and
dinoprost. There were no differences (p>0.05) between cloprostenol and
dinoprost in conception rate (65.2% vs. 66.2%, respectively) and pregnancy
rate (57.5% vs. 54.9%, respectively). Mean days open were similar in cows
of both treatments (177.5 ± 74.6 days vs. 175.8 ± 62.6 days, respectively;
p>0.05). In conclusion, data from this study showed no significant
differences in estrus detection rates and fertility between cows with
unobserved estrus after service treated with cloprostenol or dinoprost.
Both products are equally useful for the treatment of non-pregnant dairy
cows with anestrus after service within a reproductive herd health program.
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