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Induction and synchronization of estrus in dairy cows using a single injection of PGF2α and GnRH

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Author(s): Mujić E. | Jotanović Stoja | Nedić D. | Tešić M. | Šahinović R. | Vekić M. | Vilić H.

Journal: Acta Veterinaria
ISSN 0567-8315

Volume: 62;
Issue: 5-6;
Start page: 591;
Date: 2012;
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Keywords: cows | fertility | GnRH | induction | PGF2α

ABSTRACT
The aim of this study was to examine the effects of treatment with a single injection of GnRH and PGF2α on estrous response, fertility and service period. A total of 120 lactating Simmental cows were divided into four groups of 30 cows each: group PGF2α 40 was treated on the 40th day post partum with a single injection of 2 mL prostaglandin analogue (Estrumate), group PGF2α 50 was treated in the same way on the 50th day, group GnRH was treated on the 40th day post partum with a single injection of 2 mL GnRH analogue (Receptal), and the fourth group (control) was not hormonally treated. Fertility of cows was not significantly different (p>0.05). The difference in the estrous response and service-period between the control group and experimental groups was statistically significant (p
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