EFFECT OF EARLY CALVING OF SIMMENTALER HEIFERS UNDER AN EXTENSIVE MANAGEMENT-SYSTEM

被引：0

作者：

VANDERMERWE, PS

SCHOEMAN, SJ

机构：

[1] UNIV PRETORIA,DEPT ANIM & WILDLIFE SCI,PRETORIA 0002,SOUTH AFRICA

[2] NEUDAMM COLL AGR,WINDHOEK 9000,NAMIBIA

来源：

SOUTH AFRICAN JOURNAL OF ANIMAL SCIENCE-SUID-AFRIKAANSE TYDSKRIF VIR VEEKUNDE | 1995年 / 25卷 / 02期

关键词：

BEEF CATTLE; EARLY MATING; PRODUCTIVITY; SIMMENTALER;

D O I：

暂无

中图分类号：

S8 [畜牧、动物医学、狩猎、蚕、蜂];

学科分类号：

0905 ;

摘要：

Productivity of Simmentaler heifers, first mated at 14 months of age (2 M) compared to the traditional system of mating at 26 months of age (3 M), was investigated under extensive farming conditions. Both first calving (60.8 vs. 79.5%) and recalving rates (42.4 vs. 71.2%) differed (P < 0.01) between 2 M and 3 M heifers, respectively. Although total number of calves born (4.0 vs. 3.2) and weaned (3.3 vs. 3.1) over seven years differed (P less than or equal to 0.05) between 2 M and 3 M, total weaning weight (669 vs. 645 kg) was not significantly (P > 0.05) influenced. Also, 18.6% of all calves born in 2 M, died at birth. It is concluded that improved productivity is unlikely in an early mating system without additional inputs.

引用

页码：36 / 39

页数：4