Influence of estrogen in fertility of “problem" cows (repeat-breeding)
DOI:
https://doi.org/10.1590/S1678-3921.pab1971.v6.17746Abstract
The problem of repeat breeding was detected in 14% of a crossbred cattle herd of 333 cows in the State of Rio de Janeiro. The cows were on pasture and received a supplemental ration of concentrate during milking. Artificial insemination was used. An experiment with estrogenic hormone (2 mg) intravenously injected after insemination showed that 31 of 46 cows (67.4%) got pregnant with 68 total inseminations against 204 previous negative ones. The authors concluded that estrogenic hormone may increase fertility in repeat-breeders with a history of three or more inseminations without conception.
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Araújo, P. G., Pizelli, G. N., Carvalho, M. R. de, Resende, O. de A., & Britto, D. P. P. de S. (2014). Influence of estrogen in fertility of “problem" cows (repeat-breeding). Pesquisa Agropecuaria Brasileira, 6(1), 131–135. https://doi.org/10.1590/S1678-3921.pab1971.v6.17746
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ERRATA