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Turkish Journal of Veterinary & Animal Sciences

Abstract

The objective of the experiment was to compare the dominant follicle size, growth rate of the dominant follicle, estrus response, plasma progesterone concentration, and pregnancy in Nili Ravi buffaloes synchronized by controlled internal drug release (CIDR; 1.38 g) and medroxyprogesterone acetate sponge (MPAS; 250 mg) in the ovulation synchronization (OvSynch) protocol. The experiment had a randomized complete block design. Buffaloes (n = 42) were blocked by parity, body weight, body condition score, and ovarian status, and, within the block, they were randomized to receive either CIDR or MPAS and that day was considered day 0 of the experiment. On days 0 and 9, the buffaloes received GnRH analogue (50 μg of lecirelin acetate) and, on day 7, 0.075 mg cloprostenol sodium and the intravaginal device was removed. The dominant follicle diameter and growth rate were monitored every 12 h until ovulation. The growth rate and final diameter of the ovulatory follicle were greater (p < 0.01) in the CIDR treatment compared with the MPAS treatment. The proportion of estrus and estrus intensity scores were more (p < 0.05) in the CIDR treatment compared to the MPAS treatment. Plasma P4 concentration did not differ (p > 0.05) on days 0, 2, 6, or 13 in either treatment but CIDR treatment gave a greater (p < 0.05) progesterone concentration in the plasma than MPAS on day 4 of treatment. The 21-day nonreturn rate was greater (p < 0.05) in the CIDR treatment as compared with the MPAS treatment. However, pregnancy on days 35 and 65 did not differ (p > 0.05) between the treatments. In conclusion, the use of CIDR in the OvSynch protocol without timed insemination was advantageous over MPAS during the breeding season in cyclic buffaloes.

Author ORCID Identifier

MUHAMMAD BINYAMEEN: 0000-0002-4403-2480

ALI HUSNAIN: 0000-0001-7204-6225

SABA ANWAR: 0009-0008-9134-0110

MUHAMMAD WASEEM: 0009-0000-0322-4008

MUHAMMAD SALEEM: 0000-0002-0858-9169

DOI

10.55730/1300-0128.4416

Keywords

Buffalo, synchronization, estrus, progesterone, follicle, pregnancy

First Page

105

Last Page

112

Publisher

The Scientific and Technological Research Council of Türkiye (TÜBİTAK)

Creative Commons License

Creative Commons Attribution 4.0 International License
This work is licensed under a Creative Commons Attribution 4.0 International License.

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