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Comparison of piglet birth weight classes, parity of the dam, number born alive and the relationship with litter variation and piglet survival until weaning

机译：仔猪出生体重等级，水坝平价，活产数量以及与断奶仔猪和断奶仔猪存活率之间关系的比较

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摘要

The objectives of this study was to determine the relationship between individual piglet birth weight and the odds of survival until weaning and differences due to sow parity. Piglets in this study were purebred Yorkshire (n=70763), purebred Landrace (n=51091), purebred Duroc (n=16834), and Landrace x Yorkshire or Yorkshire x Landrace (n=38447) reciprocal F1 piglets. Data were recorded from sows in four production units within the same genetic flow from September 2009 through November 2013. Piglets were individually weighed and identified within 24 hours of birth and cross-fostering was completed within 48 hours of birth. Survival was defined as the piglet's ability to survive from birth until weaning (mean=22.9 +/- 3.3 days). During analysis, piglets were categorized into birth weight classes based on their individual birth weight. Data were analyzed using logistic binomial regression to estimate the odds ratio of survival until weaning among birth classes and parity. Odds to survival were generally higher as birth weight increased and piglets weighing 1.60-2.05 kg showed an increase in odds ratio of pre-weaning survival relative to all other piglets. As parity increased, the odds of surviving decreased. Piglets from parity 1 and 2 sows, showed (P<0.001) higher odds ratios of surviving, in relation to piglets from parity 3-8 sows.
机译：本研究的目的是确定个体仔猪出生体重与断奶前存活率之间的关系以及母猪均等引起的差异。本研究的仔猪为纯种约克夏（n = 70763），纯种长白（n = 51091），纯种杜洛克（n = 16834）和长白×约克夏或约克夏×长白（n = 38447）​​互为F1仔猪。从2009年9月至2013年11月，以相同的遗传流程从四个生产单位的母猪记录数据。仔猪分别称重并在出生后24小时内鉴定，交叉育种在出生后48小时内完成。存活率定义为仔猪从出生到断奶的存活能力（平均= 22.9 +/- 3.3天）。在分析过程中，根据仔猪的个体出生体重将其分类为出生体重类别。使用逻辑二项式回归分析数据，以评估出生类别和胎次之间断奶前的存活率。随着出生体重的增加，存活的几率通常更高，体重在1.60-2.05 kg的仔猪相对于所有其他仔猪而言，断奶前存活的优势比增加。随着平价的增加，生存的几率降低。与来自3-8个同等母猪的仔猪相比，来自1和2个同等母猪的仔猪存活率更高（P <0.001）。

著录项

  • 作者

    Krahn, Gregory Thomas.;

  • 作者单位

    Iowa State University.;

  • 授予单位 Iowa State University.;
  • 学科 Animal sciences.
  • 学位 M.S.
  • 年度 2015
  • 页码 61 p.
  • 总页数 61
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
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