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Revista Lasallista de Investigación
Print version ISSN 1794-4449
Abstract
GOMES, Tiago Botelho and NARVAEZ, Héctor Javier. Presynchronization with Progesterone for Induction of Cyclicity in Bos Taurus Indicus Cows in Postpartum Anestrus Period. Rev. Lasallista Investig. [online]. 2021, vol.18, n.2, pp.85-93. Epub Mar 12, 2022. ISSN 1794-4449. https://doi.org/10.22507/rli.v18n2a7.
Objective:
The objective of this study was to evaluate the effect of pre-synchronization with progesterone (P4) for 3 and 6 days in Nelore cows in postpartum anestrus period, submitted to a fixed-time artificial insemination program (FTAI).
Materials and methods:
Seventy-four multiparous Nelore cows with a body condition of 2.5 were used. The cows were submitted to three experimental groups, control group and groups pre-synchronized with P4 for a period of 3 and 6 days. For the determination of postpartum anestrus status, ultrasound scans and blood samples were taken to verify the absence of endogenous P4. Forty-five days after AI, gestation was diagnosed. Data were obtained by descriptive analysis and in the case of presentation of significant differences the Chi-square test was used, considering a frequency of P < 0.05.
Results:
A higher gestation rate was observed for the group that was pre-synchronized for three days with P4 (40 %), in relation to the groups of six days of pre-synchronization and control (25 % and 32 %, respectively).
Conclusion:
It is possible to conclude that the pre-synchronization with P4 for three days improved the gestation rate of Nelore cows in the postpartum anestrus period.
Keywords : Artificial insemination; Bos indicus; hormones; ovulation; pregnancy rates.