1. bookVolume 19 (2019): Issue 3 (July 2019)
Journal Details
License
Format
Journal
eISSN
2300-8733
First Published
25 Nov 2011
Publication timeframe
4 times per year
Languages
English
Open Access

Effect of Utilization of Single or Double Prostaglandin Administration Within an Ovsynch Fixed-Time Artificial Insemination Protocol During Summer Season in Dairy Cows

Published Online: 30 Jul 2019
Volume & Issue: Volume 19 (2019) - Issue 3 (July 2019)
Page range: 725 - 731
Received: 13 Nov 2018
Accepted: 05 Mar 2019
Journal Details
License
Format
Journal
eISSN
2300-8733
First Published
25 Nov 2011
Publication timeframe
4 times per year
Languages
English
Abstract

This study investigated the fertility of dairy cows during summer season after treatment with a single or double PGF in a progesterone (P4)-based Ovsynch protocol for fixed-time artificial insemination (FTAI). The data were compared to a treatment effectuated during winter season. Two groups of 60 dairy cows each were randomly assigned on day 60 post-partum to single PGF or double PGF group. At removal of the P4 treatment the single PGF group received a single dose and the double PGF group received two doses of PGF at 24 hours apart. In each group, 30 cows were treated during the summer (June, July and August) and 30 cows during the winter (December, January and February) season. During summer season a double PGF dose did not influence pregnancy rate at FTAI but improved cumulative pregnancy rate 60 days after FTAI (43% vs 69% for single PGF and double PGF administration, respectively; P<0.05). During winter season the single or double PGF administration did not modify PR or cumulative PR. In conclusion, during summer the utilization of a double instead of single PGF treatment into a P4-based Ovsynch-FTAI protocol did not increase pregnancy rate at FTAI but improved cumulative pregnancy rate.

Keywords

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