Acceptability of beef from Angus-Hereford or Angus-Hereford-Brahman steers finished on all-forage or a high-energy diet

Bidner, T.D.; Schupp, A.R.; Mohamad, A.B.; Rumore, N.C.; Montgomery, R.E.; Bagley, C.P.; McMillin, K.W.

Journal of Animal Science 62(2): 381-387


ISSN/ISBN: 0021-8812
DOI: 10.2527/jas1986.622381x
Accession: 001292145

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Steers [44 Aberdeen-Angus X Hereford (AH) and 43 Aberdeen-Angus X Hereford X Brahman (AHB)] on similar forage diets were randomly assigned according to breed-type during 2 years to a 70-day maize-based diet or a forage-based diet or a forage-based diet of Bermudagrass and ryegrass pastures. The steers were fed to an average slaughter weight of 482 kg, and live-animal performance, carcass characteristics, muscle quality and palatability of steaks were evaluated. The 70-day grain-fed steers had higher (P<0.01) average on-test daily gains than the forage-fed steers. The AHB steers had heavier (P<0.05) final test weights and gained faster for the total test period than the AH steers. The grain-fed steers had a higher dressing percentage, more marbling, a higher quality grade and whiter fat than the forage-fed steers (P<0.01). The forage-fed steers had darker lean colour, higher Hunter colour difference scores and higher myoglobin concentration than the grain-fed steers (P<0.01). Even though the fat thicknesses were similar for the 2 breed-types, the AH steers had more marbling and higher quality grades (P<0.01) than the AHB steers. Steaks from AH steers had lower shear values (P<0.05) than steaks from the AHB steers as estimated by Warner-Bratzler shear (WBS). There was no significant difference in consumer evaluations of loin, rib or round steaks attributable to diet. AH and AHB steers finished on all-forage or a 70-day grain diet produced an acceptable consumer product.