Effect of PGF2α and GnRH on the reproductive performance of postpartum dairy cows subjected to synchronization of ovulation and timed artificial insemination during the warm or cold periods of the year

This study was designed to evaluate the reproductive performance of lactating dairy cows (Holstein Friesian) after the injection of PGF2α analogue on Day 15 postpartum, and GnRH analogue on Day 23 after artificial insemination (AI) with Presynch (two injections of PGF2α, administered 14 days apart s...

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Bibliographic Details
Published in:Theriogenology 2014-08, Vol.82 (3), p.509-516
Main Authors: Akbarabadi, M. Afsari, Shabankareh, H. Karami, Abdolmohammadi, A., Shahsavari, M.H.
Format: Article
Language:English
Subjects:
Animals
Breeding - methods
Cattle
Dairy cow
Dinoprost - administration & dosage
Dinoprost - pharmacology
Estrus Synchronization
Female
Gonadotropin-Releasing Hormone - administration & dosage
Gonadotropin-Releasing Hormone - pharmacology
Insemination, Artificial - methods
Insemination, Artificial - veterinary
Postpartum
Postpartum Period
Pregnancy
Pregnancy Rate
Presynch-Ovsynch
Reproductive performance
Seasons
Timed AI
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Summary:This study was designed to evaluate the reproductive performance of lactating dairy cows (Holstein Friesian) after the injection of PGF2α analogue on Day 15 postpartum, and GnRH analogue on Day 23 after artificial insemination (AI) with Presynch (two injections of PGF2α, administered 14 days apart starting at 30–35 days postpartum) + Ovsynch-based (GnRH–7 days–PGF2α–2 days–GnRH–16–20 hours–timed artificial insemination) treatments, during the warm and cold periods of the year. All the cows (n = 313) were assigned to one of the four groups including: M1 (n = 72) in which the cows were treated with PGF2α on Day 15 postpartum + Presynch-Ovsynch + GnRH on Day 23 post-AI; M2 (n = 41) in which the cows received PGF2α on Day 15 postpartum + Presynch-Ovsynch; M3 (n = 100) including the cows that got Presynch-Ovsynch; and control group (n = 100) including the cows that were not treated and were inseminated at natural estrus. Pregnancy diagnosis was performed 28 to 35 days post-insemination by means of ultrasound. The results showed that treatment with PGF2α on Day 15 postpartum significantly decreased the days to conception and the number of services per conception (P 
ISSN:0093-691X
1879-3231
DOI:10.1016/j.theriogenology.2014.05.005