120 Evaluation of ovulation synchronization protocols and alternative pregnancy diagnosis tools in lactating dairy cows

Abstract Our objectives were to appraise three ovulation synchronization protocols and Pregnancy diagnosis(PD) methods in lactating dairy cows. Cows (n=184;4.2 ± 1.2 lactations and average daily milk yield>28 kg with 3X milkings) were randomly assigned to 1 of 3 timed artificial insemination(TAI)...

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Published in:Journal of animal science 2018-12, Vol.96 (suppl_3), p.372-372
Main Authors: Shahzad, A, Abbas, A, Nak, D, Nak, Y, Khan, I, Mughal, Z
Format: Article
Language:English
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Summary:Abstract Our objectives were to appraise three ovulation synchronization protocols and Pregnancy diagnosis(PD) methods in lactating dairy cows. Cows (n=184;4.2 ± 1.2 lactations and average daily milk yield>28 kg with 3X milkings) were randomly assigned to 1 of 3 timed artificial insemination(TAI) protocols: 1)Ovsynch protocol (n=66), GnRH-PGF2α-GnRH; 2)G7G-Ovsynch (n=63) protocol, PGF2α,GnRH 2 days later followed by Ovsynch; 3)PG7G-Ovsynch(n=55) protocol, PGF2α 14d before the start of G7G-Ovsynch protocol.Pregnancy rate(PR) was determined on d30, d60 and d90 post TAI using ultrasonography(US), P4(RIA), milk and Plasma PAGs(ELISA). The PR was compared using chi-square. Milk, plasma PAGs and plasma P4 profiles were analyzed using REG procedures of SAS(P
ISSN:0021-8812
1525-3163
DOI:10.1093/jas/sky404.817