Failure of an intramuscular injection of an analogue of gonadotrophin-releasing hormone 11 to 13 days after insemination to increase pregnancy rates in dairy cattle

At 11 to 13 d after insemination, 1028 dairy cows on 19 farms were given an intramuscular injection of 10 micrograms of the GnRH analogue buserelin. Their reproductive performance was compared to 1022 control cows receiving a placebo. The GnRH analogue-treated cows had fewer short interoestrous inte...

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Bibliographic Details
Published in:	Australian veterinary journal Vol. 67; no. 10; p. 359
Main Authors:	Jubb, T F, Abhayaratne, D, Malmo, J, Anderson, G A
Format:	Journal Article
Language:	English
Published:	England 01-10-1990
Subjects:	Animals Buserelin - pharmacology Cattle - physiology Female Fertility - drug effects Fertilization - drug effects Insemination, Artificial - veterinary Pregnancy
Online Access:	Get more information
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Summary:	At 11 to 13 d after insemination, 1028 dairy cows on 19 farms were given an intramuscular injection of 10 micrograms of the GnRH analogue buserelin. Their reproductive performance was compared to 1022 control cows receiving a placebo. The GnRH analogue-treated cows had fewer short interoestrous intervals compared to the control cows, but there were no significant differences in pregnancy rates to either the insemination preceding or following treatment, in calving to conception interval, or to percent pregnant by the end of mating. There were no differences between treatments in herds of high, average or low pregnancy rate, in 2-year-old cows or cows greater than 2-years-old and in cows calved 40 d or less, or greater than 40 d. The use of 10 micrograms of the GnRH analogue, buserelin, 11 to 13 d after insemination, cannot be recommended as a method of improving reproductive performance in dairy herds.
ISSN:	0005-0423
DOI:	10.1111/j.1751-0813.1990.tb07402.x