EFFECT OF TWO HORMONAL TREATMENTS ON OVARIAN ACTIVITY POSTPARTUM OF DAIRY COWS

Authors

Keywords:

eCG, GnRH, follicles, corpus luteum, body condition, pregnancy.

Abstract

In order to evaluate the effect of two hormonal treatments on ovarian activity in postpartum cows with anestrus, this work was carried out at the La Soledad Cattle Dairy Farm, located in Bella Vista, Gualaca district, Chiriquí Province. Twenty multiparous cows between 45 and 60 days open, average live weight of 460 kg and average age of five years were selected. Cows were randomly separated into two groups: the first group received 400 IU of equine chorionic gonadotrophin (eCG) (T1) and the second received 10 mcg buserelin acetate (synthetic hormone GnRH) (T2). Data were analyzed through a completely random design (DCA). Thenon-parametric variables were analyzed using a chi-square test. The statistical analysis indicated that there were no significant differences between treatments, however, the interaction response and body condition were significant (P<0,01), indicating that the response to hormonal treatments was influenced by the body condition of the cow. The interaction response and number of births tended to be significant (P<0,08). Regarding the size of the antral follicles (AF), no significant differences were observed, either before or after the treatments were applied, nor were significant differences observed for size of the corpus luteum (CL). Treatment differences were significant (P<0,05) for the variable gestation rate at first service, with a combined gestation rate of 76,9% (cows that responded to treatment and cows that did not) in T1. The gestation rate and response to treatment were significant (P<0,02), which reflects the effectiveness of treatment on gestation to first service. These results allow us to conclude that under adequate body condition eCG treatments are more effective in resuming ovarian activity in cows postpartum is correct.

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References

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Published

2023-01-06

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EFFECT OF TWO HORMONAL TREATMENTS ON OVARIAN ACTIVITY POSTPARTUM OF DAIRY COWS. (2023). Ciencia Agropecuaria, 36, 118-138. https://idiap.desarrollo-ojs1.metadatos.org/index.php/ciencia-agropecuaria/article/view/608

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