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首页> 外文学位 >Genetic analysis of production traits for improvement of national beef cattle genetic evaluations: Mature weight, body condition score, hip height, birth weight, and weaning weight.
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Genetic analysis of production traits for improvement of national beef cattle genetic evaluations: Mature weight, body condition score, hip height, birth weight, and weaning weight.

机译：对生产性状的遗传分析，以改善全国肉牛的遗传评价：成熟体重，身体状况评分，臀部高度，出生体重和断奶体重。

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摘要

National beef cattle genetic evaluations must be complete and accurate in order to have the greatest impact on selection. Improvements can be accomplished through addition of traits that will aid in selection for economically relevant traits and by more accurate analysis of traits currently included in genetic evaluations. Genetic parameters were estimated for mature weight, body condition score, and mature hip height using records from one control and three selection lines of Hereford cattle; these traits are not routinely included in genetic evaluations. Estimates of heritability were 0.75 (0.11), 0.63 (0.09), 0.16 (0.04), 0.48 (0.04) for mature weight, mature weight adjusted for body condition score, body condition score, and mature hip height, respectively. Parameters for weaning and yearling hip height were estimated using field data from the North American Limousin Foundation. Estimates of heritability were 0.36 (0.02) and 0.43 (0.02) for weaning and yearling hip height, respectively. Age-of-dam adjustment factors were evaluated for birth and weaning weight using field data from the Red Angus Association of America. Birth weight adjustments for bull calves were calculated to be 3.13, 1.41, 0.41, and 1.13 kg for dams that were 2, 3, 4, and 11 yr of age and older when set to a mature cow basis of 5 to 10 years of age. Birth weight adjustments for heifer calves were 3.08, 1.32, 0.45, and 1.04 kg, for the same age groups, respectively. For weaning weight, adjustments were calculated to be 32.97, 17.19, 7.30, and 11.97 kg for bull calves and 25.80, 13.70, 4.90, and 10.48 kg, for heifer calves for the same age-of-dam groupings, respectively. Mature weight, body condition score, and hip height can be included in genetic evaluations to aid producers in selection decisions. More appropriate estimates of age-of-dam adjustment factors for birth and weaning weight will improve prediction of breeding values for these traits.
机译：国家肉牛遗传评估必须完整，准确，以便对选择产生最大影响。可以通过添加有助于选择经济相关性状的性状和更准确地分析目前遗传评价中包括的性状来实现改进。使用来自赫里福德牛的一个对照和三个选择品系的记录，估计了成熟体重，身体状况评分和成熟髋高的遗传参数。这些特征通常不包括在遗传评估中。对于成熟体重，遗传力估计分别为0.75（0.11），0.63（0.09），0.16（0.04），0.48（0.04），针对身体状况评分，身体状况评分和成熟臀部高度调整的成熟体重。断奶和一岁臀部高度的参数是使用来自北美利姆赞基金会的现场数据估算的。断奶和一岁髋高度的遗传力估计分别为0.36（0.02）和0.43（0.02）。利用美国红安格斯协会的田间数据评估了大坝年龄调整因子的出生和断奶体重。对于设定为5至10岁的成年母牛的2岁，3岁，4岁和11岁及以上的水坝，公牛犊的出生体重调整计算为3.13、1.41、0.41和1.13公斤。 。在相同年龄组，小母牛的出生体重调整分别为3.08、1.32、0.45和1.04 kg。对于断奶体重，对于相同的坝龄分组，公牛犊的调节量分别为32.97、17.19、7.30和11.97 kg，小母牛犊的调节量分别为25.80、13.70、4.90和10.48 kg。成熟的体重，身体状况评分和臀部高度可以包括在遗传评估中，以帮助生产者做出选择决定。有关出生和断奶体重的大坝年龄调整因子的更适当的估计将改善对这些性状的育种值的预测。

著录项

  • 作者

    Rumph, Janice Michele.;

  • 作者单位

    The University of Nebraska - Lincoln.;

  • 授予单位 The University of Nebraska - Lincoln.;
  • 学科 Agriculture Animal Culture and Nutrition.; Biology Genetics.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 241 p.
  • 总页数 241
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 饲料;遗传学;
  • 关键词

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