Post Weaning Feeding Systems for Beef Heifers to be Bred at 14/15 Months of Age

Revista Brasileira de Zootecnia

Rocha, Marta Gomes da¹  Lobato, José Fernando Piva¹ 

关键词: improved pasture;    sorghum silage;    supplementation    Introdução A tendência mundial de intensificação da produção de bovinos de corte;    com ênfase na redução da idade de acasalamento das novilhas;    tem reflexos no Rio Grande do Sul;    onde algumas propriedades rurais já utilizam;    no rebanho de cria;    um conjunto de práticas que resulta em vacas primíparas aos 24 meses de idade;   

DOI  :  10.1590/S1516-35982002000700025

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The experiment evaluated the performance of beef heifers submitted to three alternatives of autumn-winter feeding systems, during 88 days, and after this period on improved pastures all together until the end of theirs first mating season, with 14-15 months of age. The systems were: Pasture- continuous grazing on cultivated annual ryegrass (L. multiflorum Lam); supplementation- continuous grazing on natural pasture plus energy and protein supplementation; feedlot - feedlot, with sorghum silage plus non- proteic nitrogen (NNP). After this period, all heifers grazed together on improved natural pastures with annual ryegrass, white clover (Trifolium repens) and birdsfoot trefoil (Lotus corniculatus). These data were collected in a farm located in Dom Pedrito, RS, from 395 beef heifers from three genetic groups: Hereford; 3/4 Hereford -1/4 Nellore; 5/8 Hereford- 3/8 Nellore. Live weight (LW), body conditions score (BCS) and live weight daily gains (LDG) were recorded. No differences could be detected among systems for LW and LDG. Feedlot heifers had greater BCS. At the beginning and end of the mating season, heifers from pasture group were heavier and had greater BCS than heifers from feedlot and supplementation.

【 授权许可】

CC BY-NC