Evaluation of Bonsmara and Belmont Red cattle breeds in South Africa. 1. Productive performance
Evaluation of Bonsmara and Belmont Red cattle breeds in South Africa. 1. Productive performance
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DOI：
10.1071/ea05223
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发表时间：
2006-01-01
影响因子：
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通讯作者：
Bosman, DJ
中科院分区：
文献类型：
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作者：
Corbet, NJ;Shepherd, RK;Bosman, DJ
在南非同期饲养的群体中比较了邦斯马拉和贝尔蒙特红公猪后代的生产性能。在南非4个不同的气候区，对96头邦斯马拉种公牛和18头贝尔蒙特红种公牛的4279头纯种后代进行了15年的测定。生长性状的测量生长股票从出生到18个月的牧场。在高蛋白质日粮喂养的雄性后代上记录体重增加、饲料转化率、框架尺寸、阴囊周长和视觉评估的“功能效率”评分。对雄性后代的一个子集测量胴体性状。记录繁殖雌性动物的首次产犊年龄、重复测量产犊日期和产犊间隔，作为生殖性能指标。在大量田间感染期间，对不同年龄段的雄性和雌性进行蜱计数。在某些性状上，后代表现存在差异。Bonsmara配种动物的功能效率评分通常高于贝尔蒙特红后代。贝尔蒙特红种公牛犊出生时体重较轻（35.9 v. 37.3; P< 0.05），贝尔蒙特红种公牛犊的平均产犊间隔较短（440 v. 455; P< 0.05）。地区间的父系品种相互作用并不重要。得分和测量性状的差异通常反映了品种协会采用的选择政策的差异。生长和生育性状的变化，由于公畜是大于由于品种的变化，并表现出潜在的识别上级个人。所研究的一系列性状和环境的父系品种的表现表明，从南非牛群中选择的Bonsmara和贝尔蒙特红动物适合纳入澳大利亚贝尔蒙特红牛群的育种计划。
The productive performance of progeny by Bonsmara and Belmont Red sires was compared in contemporarily reared groups in South Africa. Measurements on 4279 pedigreed progeny of 96 Bonsmara sires and 18 Belmont Red sires were recorded over 15 years in 4 diverse climatic regions of South Africa. Growth traits were measured on growing stock from birth to 18 months at pasture. Weight gain, feed conversion rate, frame size, scrotal circumference and visually assessed 'functional efficiency' scores were recorded on male progeny fed high protein rations. Carcass traits were measured on a subset of the male progeny. Age at first calving, and repeated measurements of calving date and calving interval were recorded on breeding females as indicators of reproductive performance. Tick counts were made on males and females across a range of ages during times of heavy field infestation.There were differences in progeny performance for some traits. Bonsmara sired animals generally scored higher than Belmont Red progeny for functional efficiency. Belmont Red sired calves were lighter at birth (35.9 v. 37.3; P< 0.05) and cows by Belmont Red sires had a shorter average calving interval ( 440 v. 455; P< 0.05). Sire breed by region interaction was not important. The differences in scored and measured traits generally reflected differences in selection policies adopted by the breed societies. Variation in growth and fertility traits due to sire was greater than variation due to breed and demonstrated the potential for identifying superior individuals. The performance of the sire breeds for the range of traits and environments studied advocated that selected Bonsmara and Belmont Red animals from South African herds would be suitable for inclusion in breeding programs in Australian Belmont Red herds.