What question did this study set out to answer?

This study aims to evaluate the efficacy of different estrus induction protocols in dairy cows in Algeria.

June 4, 2026

Comparative Efficacy of Estrus Induction Protocols Using PGF2α Alone Versus OvSynch and Select Synch in Dairy Cattle in Algeria.

Key Points

This study aims to evaluate the efficacy of different estrus induction protocols in dairy cows in Algeria.
Cows were assigned to receive either PGF2α alone, OvSynch, or Select Synch protocols.
Pregnancy was diagnosed via ultrasound at day 30 and confirmed by trans-rectal palpation at day 45.
Estrus response was recorded, with insemination based on observed estrus.
Estrus response rates for PGF2α, OvSynch, and Select Synch were 74%, 48.6%, and 40%, respectively.
Average pregnancy rates were 54.4% for PGF2α, 31.4% for OvSynch, and 28.6% for Select Synch (P<0.005).
Conception rates were 73.1% for PGF2α, 65% for OvSynch, and 71.4% for Select Synch (P>0.005).

Abstract

Introduction: The objective of this study is to evaluate the efficacy of estrus induction protocols based on prostaglandin F2α (PGF2α), compared with an OvSynch-type variant and the Select Synch protocol, in terms of reproductive performance in dairy cows in Algerian farms. Materials P>0.05), while average pregnancy rates were 54.4%, 31.4%, 28.6% (P0.005) for groups 1, 2, and 3, respectively. Given its simplicity, cost-effectiveness, and efficiency, the prostaglandin-only protocol is recommended for cows inseminated based on observed estrus. Conclusion: Protocols combining GnRH with PGF2α allow estrus synchronization, reducing the need for daily estrus detection (EI) and additional handling.

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