Abstract
AbstractThe aim of the study was to conduct a meta-analysis of published data on the effect of GnRH analogues given between 11 and 14 days after first insemination, on pregnancy rates of cattle, to ascertain if a consolidated estimate of treatment response could be determined. The results of 18 studies from 13 published papers were analysed. Odds ratios calculated for each study were found to be heterogeneous, i.e. there was significant variation in treatment response among studies, between 0 and 22% improvement in pregnancy rate. Logistic regression analysis showed that five variables affected the outcome of the model, viz., herd type (beef or dairy), age of animal (cow or heifer), oestrus synchronisation and method and time of pregnancy diagnosis. However when all variables were included only 6/13 of the publications could be analysed (2,541 /10,833 animals).
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