Pre- and post-calving forage systems and reproductive performance of primiparous cows

Revista Brasileira de Zootecnia

José Fernando Piva Lobato²  André Luís Menegaz²  Antonio Carlos Gonçalves Pereira¹ 

[1] ,UFRGS Faculdade de Agronomia Departamento de Zootecnia

关键词: body condition;    Brangus;    improved pastures;    natural pastures;    pregnancy rate;    weights;    Brangus;    condição corporal;    pastagem natural;    pastagem melhorada;    pesos;    taxa de prenhez;   

DOI  :  10.1590/S1516-35982010000900029

来源: SciELO

【 摘 要 】

During pre and post calving periods, it was evaluated the influence of the following forage systems on reproductive performance of primiparous cows: natural pasture during pre and post-calving periods; natural pastures during pre-calving period and improved pastures during post-calving period; improved pastures during pre-calving and natural pasture during post-calving; improved pasture during pre- and post-calving periods. The lowest body weights and body condition scores were observed on cows kept on natural pastures pre-calving (384.3 kg and 3.31; 391.4 kg and 3.60), followed by those on improved pastures during pre-calving and on natural pasture during post-calving period (424.4 kg and 3.60), finally, cows on improved pasture during pre- and post-calving period (421.2 kg and 3.59). Cows on improved pastures pre and post-calving showed higher body weight and body condition score in the beginning of the breeding season (442.1 kg and 3.76), higher pregnancy rate (82.3%) and they conceived earlier. Natural system during pre-calving and improved on post-calving and that with improved pasture in pre-calving and natural in post-calving did not differ on weight at the beginning of breeding season (417.2 and 409.8 kg) and on pregnancy rate (65.8 and 62.8%), respectively. However, cows on natural pasture in pre-calving and on improved pasture in post-calving conceived earlier. Cows on natural pastures showed lower weight in the beginning of breeding season (391.2 kg), the lowest pregnancy rate (52.7%), and they conceived later. Cows maintained on improved pastures pre- and post-calving improved weight and body condition score at calving and beginning of the breeding season making high reproductive performance possible.

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