Relationship between body development and reproductive response of heifers to estrus synchronization protocols in the small-scale dairy system

Los objetivos fueron determinar la respuesta reproductiva de vaquillas Holstein en hatos lecheros de pequeña escala a protocolos de sincronización de estros basado en prostaglandinas (PG) benzoato de estradiol (BE) y progesterona (P4). Vaquillas con al menos 13 meses de edad (n= 138) fueron aleatoriamente incluidas a uno de dos protocolos de sincronización: PG) administración de 500 mg cloprostenol i.m. al día 0 y al día 14; y PGPE) similar a PG pero con una aplicación adicional de 100 mg P4 + 2 mg BE en el día 7. La tasa de estros del grupo PG fue similar al grupo PGPE (84.3 vs 79.4 %; P>0.1). Las vaquillas en PGPE tuvieron mayor porcentaje de estros entre las 37-84 h post tratamiento vs el grupo PG (94.2 vs 82.5 %; P=0.05). La tasa de concepción del grupo PGPE fue mayor vs el grupo PG (94.4 vs 83.1 %; P=0.05). En el grupo PG, el desarrollo corporal al destete fue menor en vaquillas que no mostraron estro vs las que si mostraron (P<0.05). Sin embargo, en el grupo PGPE el peso al nacimiento fue menor en las vaquillas que mostraron estro vs las que no mostraron estro (P<0.05). En conclusión, las vaquillas del sistema lechero de pequeña escala presentan buena respuesta reproductiva a la sincronización de estros basada en prostaglandinas (cloprostenol). La inclusión de BE + P4 al protocolo de sincronización hormonal con PG mejora la tasa de concepción, pero tiene un efecto mínimo en la distribución del inicio de la expresión de los estros después del tratamiento.

• Publication year

  2024

• Venue

  Revista Mexicana de Ciencias Pecuarias

• Publication date

  2024-01-19

• Fields of study

  Not labeled

• Identifiers
  DOI 10.22319/rmcp.v15i1.5998
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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