A pre-synchronization program at early postpartum might increase the chances of Bos indicus cows cycling prior to 50 days regardless of the length of calf separation

The Journal of Reproduction and Development
Libia Pérez-TorresJ Luis Pablos

Abstract

The aim of this study was to establish if pre-synchronization would enhance the number of animals cycling prior to conventional breeding at 45 days irrespective of the length of calf separation. Multiparous Bos indicus cows were allotted in four groups (n = 10). Control group (C) dams remained with their calves; groups G24, G48 and G72, which were partially weaned for 24, 48 and 72 h, respectively, were estrus synchronized using a controlled internal drug. These procedures were performed at 25 days and again at 45 days postpartum. The number of follicles, presence of a corpus luteum and back fat thickness (BFT) were determined by ultrasound. The proportion of cows with estrus and ovulation at day 25 postpartum was statistically different between the control and treated groups, with the values being 20, 60, 50 and 70 for the control, G24, G48 and G72 groups respectively (P < 0.05). At days 45 postpartum, the proportion of cows with estrus and ovulation was different in group G48 compared with the other groups (P <0.05). The average BFT and body condition score for the four experimental groups in the two periods were similar (P >0.05). Animals with a higher proportion of follicles from 17 to 21 mm, BFT values above 3.5 mm and a r...Continue Reading

References

Mar 1, 1990·Journal of Animal Science·G L Williams
Jun 24, 2003·Animal Reproduction Science·G A BóM F Martínez
Mar 24, 2004·Animal Reproduction Science·G QuintansK D Sinclair
May 8, 2007·Hormones and Behavior·Carlos S Galina, Agustín Orihuela
Nov 3, 2007·Reproduction in Domestic Animals = Zuchthygiene·K ForsterA Verduzco
Feb 21, 2009·Tropical Animal Health and Production·Aída Lorena Murillo MedinaHéctor Castillo-Juárez
Sep 29, 2009·Tropical Animal Health and Production·Ivette RubioCarlos S Galina
Aug 26, 2014·Journal of Animal Science·L Pérez-TorresC S Galina

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Citations

May 11, 2019·Animals : an Open Access Journal From MDPI·Agustín Orihuela, Carlos S Galina
Mar 14, 2021·Animal : an International Journal of Animal Bioscience·L Pérez-TorresR Ungerfeld

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