An evaluation of bias in estimated breeding values for weaning weight in Angus beef cattle field records. I. Estimates of within herd genetic trend.

W. A. Zollinger, M. K. Nielsen

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Genetic trends for weaning weight were evaluated in 15 purebred herds in the United States participating in the Angus Herd Improvement. Records production testing program. Regression techniques were used for separate estimates of sire and dam contributions that were summed to estimate total herd trend. Sire contributions, calculated as the pooled within sire regression of weaning weight ratio on year of calf birth, ranged from .01 +/- .23 to 1.30 +/- .24 across the herds and average .51 ratio units/yr. Dam contributions, estimated as the pooled within dam regression of offspring weaning weight ratio, deviated from the contemporary paternal half-sib average ratio, on year of calf birth, ranged from .06 +/- .06 to .68 +/- .11 and averaged .34 ratio units/yr. A positive trend in direct effects was associated with a possible negative trend in maternal effects. The annual trend within herds ranged from .21 to 1.50 ratio units and averaged .85 units over all herds, representing 1.8 kg annual genetic gain in weaning weight.

Original languageEnglish (US)
Pages (from-to)545-549
Number of pages5
JournalJournal of animal science
Volume58
Issue number3
DOIs
StatePublished - Mar 1984

Fingerprint

genetic trend
weaning weight
Angus
Weaning
breeding value
beef cattle
Breeding
herds
Weights and Measures
dams (mothers)
sires
Parturition
calves
herd improvement
purebreds
maternal effect
genetic improvement
testing

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

An evaluation of bias in estimated breeding values for weaning weight in Angus beef cattle field records. I. Estimates of within herd genetic trend. / Zollinger, W. A.; Nielsen, M. K.

In: Journal of animal science, Vol. 58, No. 3, 03.1984, p. 545-549.

Research output: Contribution to journalArticle

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