Rendimientos de vacas primíparas con parto a dos años en función de su ritmo de crecimiento en lactación y recría

• J.A. Rodriguez Sánchez ^[1] ; A. Sanz ^[1] ; I. Casasús ^[1]
  1. [1] CITA
• Localización: XV Jornadas sobre Producción Animal: 14 y 15 de mayo de 2013, Zaragoza / Jorge Hugo Calvo Lacosta (aut.), Isabel Casasús Pueyo (aut.), Margalida Joy Torrens (aut.), Javier Álvarez Rodríguez (aut.), Luis Varona Aguado (aut.), Begoña Panea Doblado (aut.), Carlos Calvete Margolles (aut.), Joaquim Barcells Teres (aut.), Vol. 1, 2013, ISBN 978-84-695-7684-7, págs. 335-337
• Idioma: español
• Títulos paralelos:
  • Performance of two year old calving primiparous cows as affected by their growth patterns during lactation and rearing periods
• Enlaces
  • Texto Completo Libro  1 (pdf)   2 (pdf) 
• Resumen

  • An experiment was conducted to analyse the performance in primiparous cows calving at two years, depending on their growth patterns from birth to first mating (Timed Artificial Insemination at 15 months). Twenty-five Parda de Montaña heifers, born in autumn, were assigned to two nutrition levels during lactation (0-6 months: High vs. Low) and rearing periods (6-15 months: High vs. Low). Primiparous cows’ performances were not significantly affected by the earlier first service at 15 months or the different growth patterns registered. Only the postpartum anoestrous interval was markedly longer in the animals with low nutrition level during the rearing period (77.7 vs. 106.5 days, for in High and Low, P<0.05). It would be feasible to advance the first calving at two years guaranteeing growth rates close to 1 kg/d during rearing period without impairing productive and reproductive parameters.