THE PERFORMANCE OF HEREFORD X FRIESIAN OFFSPRING OF BULLS SELECTED FOR LEAN GROWTH-RATE AND LEAN FOOD CONVERSION EFFICIENCY

SC BISHOP*, JS BROADBENT, RM KAY, S. P. RIGBY, AV FISHER

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

The performance of Hereford X Friesian calves sired by Hereford bulls selected for either lean growth rate (LGR) or lean food conversion ratio (LFCR), or by unselected Hereford bulls, was evaluated on 327 calves on three farms over 2 years. Animals started test at 130 days of age on average and remained on test for approximately 300 days, whereupon all animals were slaughtered and carcass dissections were undertaken. Individual food intake was measured on two of the farms (189 animals), but only intake per pen of animals was measured on the third farm and individual food intake had to be estimated. LGR, LFCR and other traits describing performance were calculated from the growth, food intake and carcass composition data.

If no breed or environment interactions exist it is expected that proportionately 0.5 of the genetic differences between selected and control line bulls would be transmitted to their offspring. For the LGR and LFCR line bulls these values were 0.38 and 0.44, respectively, however the LGR value had a much smaller confidence interval. Genetic correlations derived from regressing breeding values predicted from offspring performance on breeding values predicted from the bulls's own performance in the selection experiment were 0.62 (s.e. 0.28) and 0.96 (s.e. 0.28) for LGR and LFCR, respectively. Heritabilities were: live-weight gain on test, 0.27; daily gain, 0.48; food intake, 0.06; food conversion ratio, 0.46; predicted carcass lean content, 0.10; killing-out proportion, 0.10; LGR, 0.36 and LFCR, 0.48.

Original languageEnglish
Pages (from-to)23-30
Number of pages8
JournalAnimal Production
Volume54
Publication statusPublished - Feb 1992

Keywords

  • BEEF CATTLE
  • BODY LEAN MASS
  • CROSSBREEDING
  • FOOD CONVERSION
  • SELECTION
  • PROGENY
  • CATTLE
  • GAIN

Fingerprint

Dive into the research topics of 'THE PERFORMANCE OF HEREFORD X FRIESIAN OFFSPRING OF BULLS SELECTED FOR LEAN GROWTH-RATE AND LEAN FOOD CONVERSION EFFICIENCY'. Together they form a unique fingerprint.

Cite this