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Effects of Previous Nutrition, Feedlot Regimen and Protein Level on Feedlot Performance of Beef Cattle

Effects of Previous Nutrition, Feedlot Regimen and Protein Level on Feedlot Performance of Beef... Abstract In Exp. 1, feedlot performance was measured using 200 mixed-breed heifers (276 kg and 231 d of age) previously subjected to different production systems (cornstalks vs cornstalks-grass). During the feedlot feeding phase, two energy regimens (corn vs corn silage-corn) and two protein (CP) levels (10.9 vs 12.8%) were provided. Heifers wintered on cornstalks (System 2) or wintered on cornstalks and summered on grass (System 3) had greater intakes (P < .05) and tended (P = .14) to gain faster (1.00 vs 1.21 kg/d) in the feedlot than heifers placed in the feedlot soon after weaning (System 1). Heifers managed under System 3 had greater intakes (P < .05) than heifers managed under System 2, although feed conversions (.122 vs .123 gain/feed) were similar for the two heifer groups. Feedlot regimen by protein level interactions were observed in Systems 2 and 3. Improved daily gains (P = .10) and feed conversions (P = .06) were found in heifers fed the high-CP diets (12.8%) when managed under the corn diet regimens but not in heifers managed under the corn silage-corn regimens. In Exp. 2, steers with compensating gain that were fed 11.4 or 12.4% CP finishing diets had faster (P < .05) gains and were more efficient in feed utilization (P < .05) than steers previously fed corn silage diets. Gains and efficiencies of compensating steers fed a 10.4% CP finishing diet did not differ from control steers fed 11.4% CP diets. Results of these studies suggest that cattle placed on high-energy finishing diets immediately after an extended period of nutritional restriction will respond to levels of protein higher than recommended; however, under more gradual realimentation regimens, additional protein is not warranted. This content is only available as a PDF. Author notes 2 Anim. Sci. Dept. 3 Koers Consulting Inc., Salina, KS 67401. 4 Director of Roman L. Hruska U.S. Meat Animal Research Center, Clay Center, NE 68933. Copyright 1989 by American Society of Animal Science American Society of Animal Science http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Animal Science Oxford University Press

Effects of Previous Nutrition, Feedlot Regimen and Protein Level on Feedlot Performance of Beef Cattle

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Copyright
Copyright 1989 by American Society of Animal Science
ISSN
0021-8812
eISSN
1525-3163
DOI
10.2527/jas1989.672318x
Publisher site
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Abstract

Abstract In Exp. 1, feedlot performance was measured using 200 mixed-breed heifers (276 kg and 231 d of age) previously subjected to different production systems (cornstalks vs cornstalks-grass). During the feedlot feeding phase, two energy regimens (corn vs corn silage-corn) and two protein (CP) levels (10.9 vs 12.8%) were provided. Heifers wintered on cornstalks (System 2) or wintered on cornstalks and summered on grass (System 3) had greater intakes (P < .05) and tended (P = .14) to gain faster (1.00 vs 1.21 kg/d) in the feedlot than heifers placed in the feedlot soon after weaning (System 1). Heifers managed under System 3 had greater intakes (P < .05) than heifers managed under System 2, although feed conversions (.122 vs .123 gain/feed) were similar for the two heifer groups. Feedlot regimen by protein level interactions were observed in Systems 2 and 3. Improved daily gains (P = .10) and feed conversions (P = .06) were found in heifers fed the high-CP diets (12.8%) when managed under the corn diet regimens but not in heifers managed under the corn silage-corn regimens. In Exp. 2, steers with compensating gain that were fed 11.4 or 12.4% CP finishing diets had faster (P < .05) gains and were more efficient in feed utilization (P < .05) than steers previously fed corn silage diets. Gains and efficiencies of compensating steers fed a 10.4% CP finishing diet did not differ from control steers fed 11.4% CP diets. Results of these studies suggest that cattle placed on high-energy finishing diets immediately after an extended period of nutritional restriction will respond to levels of protein higher than recommended; however, under more gradual realimentation regimens, additional protein is not warranted. This content is only available as a PDF. Author notes 2 Anim. Sci. Dept. 3 Koers Consulting Inc., Salina, KS 67401. 4 Director of Roman L. Hruska U.S. Meat Animal Research Center, Clay Center, NE 68933. Copyright 1989 by American Society of Animal Science American Society of Animal Science

Journal

Journal of Animal Science – Oxford University Press

Published: Feb 1, 1989

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