Genetic variation in residual feed intake is associated with body composition, behavior, rumen, heat production, hematology, and immune competence traits in Angus cattle1

Journal of Animal Science
Robert M HerdR F Hegarty

Abstract

This experiment was to evaluate a suite of biological traits likely to be associated with genetic variation in residual feed intake (RFI) in Angus cattle. Twenty nine steers and 30 heifers bred to be divergent in postweaning RFI (RFIp) and that differed in midparent RFIp-EBV (RFIp-EBVmp) by more than 2 kg DMI/d were used in this study. A 1-unit (1 kg DM/d) decrease in RFIp-EBVmp was accompanied by a 0.08 kg (SE = 0.03; P < 0.05) increase in ADG, a 0.58 kg/d (0.17; P < 0.01) decrease in DMI, a 0.89 kg/kg (0.22; P < 0.001) decrease in FCR, and a 0.62 kg/d (0.12; P < 0.001) decrease in feedlot RFI (RFIf). Ultrasonically scanned depths of subcutaneous fat at the rib and rump sites, measured at the start and end of the RFI test, all had strong positive correlations with RFIp-EBVmp, DMI, and RFIf (all r values ≥0.5 and P < 0.001). Variation in RFIp-EBVmp was significantly correlated (P < 0.05) with flight speed (r = -0.32), number of visits to feed bins (r = 0.45), and visits to exhaled-emission monitors (r = -0.27), as well as the concentrations of propionate (r = -0.32) and valerate (r = -0.31) in rumen fluid, white blood cell (r = -0.51), lymphocyte (r = -0.43), and neutrophil (r = -0.31) counts in blood. RFIp-EBVmp was also corre...Continue Reading

References

Sep 1, 1974·The Proceedings of the Nutrition Society·F G Whitelaw
Jan 1, 1965·The British Journal of Nutrition·K L Blaxter, J L Clapperton
Jan 1, 1966·The British Journal of Nutrition·K L Blaxter, F W Wainman
Nov 26, 2008·Journal of Animal Science·R M Herd, P F Arthur
Feb 16, 2013·Frontiers in Genetics·Wendy M Rauw
May 22, 2018·Animal : an International Journal of Animal Bioscience·D A KennyM McGee
Aug 21, 2018·Journal of Animal Science·José Antonio Torres-VázquezSamuel A Clark
Aug 25, 2018·Animal : an International Journal of Animal Bioscience·G Cantalapiedra-HijarI Ortigues-Marty

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Citations

Oct 24, 2019·Animal : an International Journal of Animal Bioscience·F TortereauD François
Jul 14, 2020·Journal of Animal Science·David N KellyDonagh P Berry
Oct 31, 2020·Journal of Animal Science·Lorena Ferreira BenficaMaria Eugênia Zerlotti Mercadante

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