Eficiencia reproductiva de Ovsynch + CIDR en vacas Holstein bajo un esquema de inseminación artificial a tiempo fijo en el norte de México

Rafael Rodríguez-Martínez, Irene Concepción Chavarría Neri, César A. Meza-Herrera, Alan Sebastián Alvarado-Espino, Juan Luis Morales Cruz, Vicente Homero González-Álvarez, Ma. Guadalupe Calderón-Leyva, Francisco G. Veliz Deras, Oscar Ángel-García

Resumen


Se evaluó el uso de Ovsynch más dispositivo intravaginal de liberación controlada de progesterona (CIDR) en vacas altas productoras. El estudio se llevó en la Comarca Lagunera (25° 44´ N, 103° 10´ O a 1,111 msnm) durante diciembre y enero. Las vacas (n=100) se pre-sincronizaron con dos inyecciones de PGF2α a los 35 y 47 días posparto y asignadas a dos tratamientos (n= 50): 1) El grupo OV recibió el protocolo Ovsynch: 100 μg de GnRH (i.m.; día 1), 25 mg de PGF2α (i.m.; día 7) y 100 μg GnRH (i.m.; día 9); 2) El grupo (OV+C) recibió el protocolo Ovsynch más un CIDR (1.38 g), retirado siete días después. Todas las vacas se expusieron a un protocolo de inseminación artificial a tiempo fijo (IATF; 16 a 20 h posteriores a la última inyección). Se registró tanto el porcentaje de preñez, el número de vacas repitiendo celo considerando dos periodos (≤24 y ≥25 días post-inseminación), así como los días de retorno al celo. Mientras que no existió diferencia entre grupos para tasa de preñez (OV= 28 %, OV+C= 32 %; P>0.05), el porcentaje de vacas que manifestaron celo después de la IATF difirió (P<0.05) entre tratamientos durante los dos periodos estudiados, 28 vs 62 % ≤24 días; 69 vs 35 % ≥25 días; OV y OV+C, respectivamente. El promedio de días en que repitieron celo fue menor (P<0.05) en el OV+C (25 ± 1.6 vs 30 ± 1.3). El tratamiento Ovsynch+CIDR no mejoró la tasa de preñez; sin embargo, redujo la latencia en el retorno al celo, destacando como una alternativa para disminuir los días a la siguiente IA, y potencialmente para mejorar la eficiencia reproductiva y el retorno económico del hato lechero.

Palabras clave


Preñez, IATF, Progesterona, Retorno a celo, Sincronización

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Referencias


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DOI: https://doi.org/10.22319/rmcp.v9i3.4300

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