Impact of estrous resynchronization on reproductive efficiency in Crossbred Cows
Abstract
The low pregnancy rate due to empty days is a significant challenge for reproductive efficiency in cattle farming. This study evaluated the impact of early resynchronization (22 days post-FTAI) and conventional resynchronization (30 days post-FTAI) in crossbred cows. A total of 120 multiparous cows, aged five years and between 85-150 days postpartum, were analyzed. The Chi-square test was used to assess the relationship between corpus luteum size and pregnancy, while Fisher’s exact test was applied to compare pregnancy rates. Although early resynchronization resulted in a higher cumulative pregnancy rate (72.73% vs. 66.15%), the difference was not statistically significant (P=0.5522). However, a significant association was found between corpus luteum size and pregnancy (P=0.0129). Embryonic losses showed no differences between treatments (P=0.5421). These results indicate that early resynchronization is an efficient strategy to reduce the interval between inseminations without affecting pregnancy rates or increasing embryonic losses. Additionally, the influence of the corpus luteum on gestation highlights the importance of its monitoring in reproductive programs. The racial composition of the cattle affects these parameters, emphasizing the need to adjust reproductive strategies according to the physiological characteristics of each breed to optimize bovine reproduction.
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