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The effect of plane of nutrition and type of diet offered to yearling Friesian steers during a winter store period on subsequent performance

Published online by Cambridge University Press:  02 September 2010

R. W. J. Steen
R. W. J. Steen
Affiliation:
Agricultural Research Institute of Northern Ireland, Hillsborough, Co. Down
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Abstract

Three randomized block experiments, involving a total of 80 castrated male cattle, were carried out to examine the effects of plane of nutrition and type of diet offered during a winter store period from about 10 to 15 months of age on the subsequent performance of late-maturing, Friesian steers slaughtered at 22 to 23 months of age. A control diet of medium-quality grass silage (mean digestible organic matter in the dry matter (DOMD) 0·617) offered ad libitum and supplemented with 0·3 kg concentrates (17·1 to 25·6 g nitrogen per kg dry matter) per head daily, which was designed to sustain a live-weight gain of 0·4 kg/day, was compared with three diets which were designed to sustain a live-weight gain of 0·7 kg/day. These were medium-quality silage supplemented with 1·6 kg concentrates, medium-quality silage supplemented with 0·6 kg concentrates and 0·25 kg fish meal and high-quality silage (mean DOMD 0·704) supplemented with 0·3 kg concentrates. The animals were at pasture for 5 months after the treatment period and were then given silage and concentrates for 3 months until slaughter. The low and high planes of nutrition sustained mean daily live-weight gains of 0·43 and 0·73 kg respectively, giving a difference in live weight at the end of the treatment period of 45 kg. Compensatory growth at pasture reduced this difference to 30 kg. This resulted in a difference of 17 kg carcass weight between the two planes of nutrition. The type of diet offered at the high plane of nutrition did not affect subsequent performance. It is concluded that, when the live-weight gain of late-maturing, Friesian, yearling cattle was reduced below about 0·7 kg/day, there was relatively little compensatory growth during the subsequent period at pasture and consequently the optimum live-weight gain during the winter for this type of animal may be higher than that previously recommended.

Type
Research Article
Information
Animal Production , Volume 42 , Issue 1 , February 1986 , pp. 29 - 37
Copyright
Copyright © British Society of Animal Science 1986

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References

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