Efecto del reemplazo folicular (GnRH) y de somatotropina bovina (bST) sobre la fertilidad de vacas lecheras expuestas a estrés calórico
DOI:
https://doi.org/10.22319/rmcp.v11i3.4828Palabras clave:
vaca lechera, Ovsynch, somatotropina, estrés calórico, GnRHResumen
Tres protocolos reproductivos fueron evaluados: 1) PG: inyección de PGF2α en el día 50 posparto e inseminación (IA) en base a detección del estro. 2) OVS (Ovsynch: día 0, GnRH; día 7, PGF2α; día 9, GnRH; día 10, IA); y 3) ROV (GnRH + Ovsynch: día- 7, GnRH; día 0, GnRH; día 7, PGF2α; día 9, GnRH; día 10, IA). Además, el efecto de la somatotropina (bST) a la IA, sobre la fertilidad al primer servicio posparto (FERT), y la tasa de preñez a 99 días posparto (PP). FERT fue similar en ROV y OVS (36.2 vs 36.6 %) (P>0.05); y mayor a PG (27.3 %) (P<0.05). Igualmente, FERT fue similar con bST y sin bST (36.2 vs 30.6 %, P>0.05). PG y sin bST (22.5 %) fue menor que OVS con (38.5 %), y sin bST (33.7 %); y que ROV con bST (37.0 %) y sin bST (36.1 %); y PG con bST (32.9 %) (P<0.05). La tasa de preñez a 99 días PP fue: OVS (60.6 %); ROV (54.3 %), superior al grupo PG (46.8 %) (P<0.05). OVS con bST (64.7 %), y sin bST (56.5 %), y ROV sin bST fueron mayores que PG sin bST (41.1 %, P<0.05). En conclusión, GnRH previo al Ovsynch (ROV) y la bST al momento de la IA no incrementaron la fertilidad del primer servicio en vacas Holstein en estrés calórico. OVS y ROV incrementaron la fertilidad del primer servicio posparto y la tasa de preñez a 99 días posparto. La somatotropina incrementó la fertilidad del primer servicio posparto solo en vacas tratadas con PG.Descargas
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