This study was conducted to test the efficacy of gonadotropic hormone (GnRH)-based synchronization protocols (Ovsynch, Heatsynch, and Ovsynch Plus) in buffaloes under field condition. Based on anamnesis and transrectal palpation twice at 10-day interval and serum progesterone (P4) concentration, 150 anoestrous buffaloes and delayed pubertal heifers were selected to induce oestrus using GnRH-based protocols. These selected animals were randomly divided into three groups: group I: Ovsynch (n = 50), group II: Heatsynch (n = 50), and group III: Ovsynch Plus (n = 50) regimen. Before treatment initiation, blood samples were collected for P4, beta-hydroxy butyric acid (β-OHB), and mineral estimation, in addition to the monitoring of oestrus signs. In this investigation, no significant difference (P > 0.05) in oestrus signs was deduced among three groups. Oestrus induction rate (OIR) was comparable (P > 0.05) among the groups (Ovsynch 82%, Heatsynch 86%, and Ovsynch Plus 88%). Conception rate (CR) following fixed time artificial insemination (FTAI) was slightly higher with Ovsynch Plus group (28%) as compared to Ovsynch (24%) and Heatsynch (18%) groups, though non-significant. Furthermore, serum glucose, β-OHB, macrominerals (calcium, potassium, and magnesium), and trace minerals (copper, zinc, and iron) remained comparable (P > 0.05) among the groups. In conclusion, all the protocols (Ovsynch, Heatsynch, and Ovsynch Plus) are efficient in oestrus induction in anoestrous buffaloes under field condition with Ovsynch Plus protocol resulting in higher CR as compared to other protocols.
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The authors thank the Director, ICAR-CIRB, and Indian Council of Agricultural Research, New Delhi for supporting this research.
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The authors declare that there is no conflict of interest.
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Rathore, R., Sharma, R., Phulia, S. et al. Comparative efficacy of oestrus synchronization protocols in buffalo (Bubalus bubalis). Trop Anim Health Prod 49, 1377–1382 (2017). https://doi.org/10.1007/s11250-017-1337-1