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Intake, growth and meat quality of steers given diets based on varying proportions of maize silage and grass silage

Published online by Cambridge University Press:  09 March 2007

D. T. Juniper ,
E. M. Browne ,
A. V. Fisher ,
M. J. Bryant ,
G. R. Nute  and
D. E. Beever
D. T. Juniper*
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AR, UK
E. M. Browne
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AR, UK
A. V. Fisher
Affiliation:
Division of Farm Animal Science, Department of Clinical Veterinary Science, University of Bristol, Langford, Bristol BS40 5DU, UK
M. J. Bryant
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AR, UK
G. R. Nute
Affiliation:
Division of Farm Animal Science, Department of Clinical Veterinary Science, University of Bristol, Langford, Bristol BS40 5DU, UK
D. E. Beever
Affiliation:
Department of Agriculture, University of Reading, Earley Gate, Reading RG6 6AR, UK
*
†E-mail: [email protected]
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Abstract

Simmental × Holstein-Friesian steers were offered four forage diets. These comprised grass silage (G); proportionately 0·67 grass silage, proportionately 0·33 maize silage (GGM); 0·33 grass silage, 0·67 maize silage (MMG); maize silage (M) from 424 (s.d. = 11·5) kg to slaughter at a minimum weight of 560 kg. Forages were mixed and offered ad libitum. Steers were offered 2 kg of a concentrate daily, the concentrate being formulated such that all steers had similar crude protein intakes across dietary treatments. A sample of steers was slaughtered at the beginning of the experimental period to allow the calculation of the rate of gain of the carcass and its components. Carcass dissection of a sample of steers allowed the development of a prediction equation of carcass composition based on thoracic limb dissection of all carcasses. Forage dry matter intake and live-weight gain increased linearly as maize silage replaced grass silage in the forage mixture, resulting in improvements in food conversion ratio (all P = 0·001). Killing-out proportion increased with maize silage inclusion (P < 0·001) but fat and conformation scores did not differ significantly between diets. However, increasing maize inclusion in the diet resulted in a greater weight (P = 0·05) and proportion (P = 0·008) of fat in the carcass, and significant increases in internal fat deposition. The inclusion of maize led to a progressive increase in the daily gains of carcass (P < 0·001), and significant increases in the daily gains of both fat (P < 0·001) and lean tissue (P < 0·001). Fat colour was more yellow in cattle given diets G and GGM than diets MMG and M(P < 0·001) and colour intensity was lower on diet M than the other three diets (P < 0·001). There were no significant differences in any aspects of eating quality between diets. Therefore, maize silage has the potential to reduce the time taken for finishing beef animals to achieve slaughter weight with no apparent detrimental effects on subsequent meat quality.

Keywords

carcass compositiongrass silagegrowthmaize silagesteers
Type
Research Article
Information
Animal Science , Volume 81 , Issue 1 , August 2005 , pp. 159 - 170
Copyright
Copyright © British Society of Animal Science 2005

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Footnotes

‡Meat and Livestock Commission, PO Box 44, Winterhill House, Snowdon Drive, Milton Keynes MK6 1AX, UK.

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