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Digestion and live-weight gain by beef cattle consuming bermudagrass supplemented with grain or different high-protein foodstuffs

Published online by Cambridge University Press:  02 September 2010

A. L. Goetsch ,
L. A. Forster Jr ,
G. E. Murphy ,
E. W. Grant ,
D. L. Galloway Sr  and
C. P. West
A. L. Goetsch
Affiliation:
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville, AR 72701, USA
L. A. Forster Jr
Affiliation:
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville, AR 72701, USA
G. E. Murphy
Affiliation:
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville, AR 72701, USA
E. W. Grant
Affiliation:
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville, AR 72701, USA
D. L. Galloway Sr
Affiliation:
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville, AR 72701, USA
C. P. West
Affiliation:
Department of Animal and Poultry Sciences, University of Arkansas, Fayetteville, AR 72701, USA
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Abstract

Two experiments were made to determine the effects on digestion characteristics and live-weight (LW) gain of cattle consuming bermudagrass of supplementing with ground maize, soya-bean meal or a maizegluten— blood meal mix alone or maize plus the protein supplements. Experiment 1 was a Latin-square design with 14-day periods using six beef cows fitted with rumen and duodenal cannulas (490 kg). Cows were given bermudagrass hay at 12·7 g/kg LW alone (control, C) or with 2·4 g/kg LW of ground maize (M), 0·98 g/kg LW of soya-bean meal (S), 0·53 g/kg LW of maize-gluten plus 0·17 g/kg (dry matter basis) of blood meal (GB), M plus S (M + S) or M plus GB (M + GB). Nitrogen (N) intake was 106, 123, 143, 148, 166 and 166 g/day; total N at the duodenum was 101, 124, 117, 126, 140 and 161 (s.e. 5·91) g/day; and post-ruminal N disappearance was 61, 77, 72, 84, 87 and 110 (s.e. 5·6) g/day for C, M, S, GB, M + S and M + GB, respectively. In experiment 2, 96 crossbred beef heifers (203 kg LW) implanted with 200 mg testosterone and 20 mg oestradiol benzoate were allotted to 12 groups by LW (two groups per treatment). Heifers grazed bermudagrass paddocks for 84 days in two 42-day periods and supplement treatments were those in experiment 1. A period × treatment interaction in LW gain was noted (P < 0·05). LW gain was 0·78, 0·81, 0·79, 0·76, 0·70 and 0·95 kg in period 1 and 0·46, 0·51, 0·56, 0·53, 0·64 and 0·61 kg in period 2 for C, M, S, GB, M + S and M + GB, respectively (s.e. 0·049). In conclusion, duodenal flow and post-ruminal disappearance of N were similar for the protein sources when offered singularly, but when given with maize values were greater for the mix of protein meals high in ruminal undegradable protein as compared with soya-bean meal. LW gain by heifer calves grazing bermudagrass was increased only by supplementation with ground maize plus the protein meal mix of low ruminal degradability.

Keywords

beef cattledigestionperformancesupplements
Type
Research Article
Information
Animal Production , Volume 51 , Issue 2 , October 1990 , pp. 263 - 275
Copyright
Copyright © British Society of Animal Science 1990

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