Journal article
Randomised controlled trial of the effect of concentration of progesterone before artificial insemination on fertility in ovulatory and anovulatory Bos indicus cattle
J Cavalieri, C Gaina, G Hepworth
Australian Veterinary Journal | WILEY | Published : 2018
DOI: 10.1111/avj.12728
Abstract
Objective: To investigate the effect of concentration of progesterone (P4) before artificial insemination (AI) on fertility in ovulatory or anovulatory Bos indicus cattle. Design: Randomised control study. Methods: The study included 162 heifers and 96 lactating cows. On days −10 to −12, animals were examined using transrectal ultrasound, administered PG and examined for a corpus luteum (CL). Those with a CL were allocated to Experiment 1. On day 0 they were administered an intravaginal progesterone-releasing device (IVD) containing progesterone (P4) (0.78 g), oestrodiol benzoate (ODB) and either saline or PG to induce high and low circulating P4 concentrations, respectively. Those without a..
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Awarded by Meat and Livestock Australia
Funding Acknowledgements
We acknowledge funding by Meat and Livestock Australia (Project B NBP.0760), Australian cattle producers and the Commonwealth government. The support of Bioniche Animal Health Australia in donating IVDs and pharmaceuticals used in this project is gratefully acknowledged. The authors declare no conflicts of interest.