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Intensive beef production 13. Replacement of concentrates with root crops

Published online by Cambridge University Press:  02 September 2010

M. Kay ,
A. Macdearmid  and
R. Massie
M. Kay
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
A. Macdearmid
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
R. Massie
Affiliation:
The Rowett Research Institute, Bucksburn, Aberdeen, AB2 9SB
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Summary

1. Two growth trials and a digestibility trial were carried out with a total of 84 British Friesian steers to investigate the substitution of root crops for a part of the concentrates in an all-concentrate diet. In Trial 1 six experimental diets were offered ad libitum and contained, on a dry-matter basis, (1) 100% concentrates, (2) 34%, (3) 66%, (4) 87% sliced swedes and (5) 66%, (6) 87% whole potatoes. In Trial 2, five diets were offered ad libitum and contained (1) 100% concentrates or (2) 34%, (3) 50%, (4) 66%, (5) 100% swedes.

2. In both the growth trials when the steers weighed less than 350 kg live weight, daily dry-matter intake was lower for steers offered the highest proportion of swedes than for steers offered concentrates. Substitution of potatoes for concentrates resulted in a higher daily dry-matter intake and daily live-weight gain than did substitution of swedes.

3. In Trials 1 and 2 rate of live-weight gain and in Trial 2 carcass gain were similar for steers on treatments 1 and 2. In Trial 2 liveweight gain declined from 1-05 to 0-87 kg/day and carcass gain declined from 0-62 to 0-51 kg/day between steers on treatments 1 and 5. 4. The replacement of concentrates with swedes or potatoes did not affect the overall digestibility of dry matter.

Type
Research Article
Information
Animal Production , Volume 15 , Issue 1 , August 1972 , pp. 67 - 73
Copyright
Copyright © British Society of Animal Science 1972

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References

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