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Effect of oestradiol -17β implantation on responses of Frieslan steers to dietary UDP concentration

Published online by Cambridge University Press:  21 November 2017

J.R. Newbold ,
P.J. Buttery ,
O.J.A. Cole ,
P.C. Garnsworthy  and
W. Haresign
J.R. Newbold
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics. LE12 5RD
P.J. Buttery
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics. LE12 5RD
O.J.A. Cole
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics. LE12 5RD
P.C. Garnsworthy
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics. LE12 5RD
W. Haresign
Affiliation:
University of Nottingham School of Agriculture, Sutton Bonington, Loughborough, Leics. LE12 5RD
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Extract

An experiment was designed to assess the effect of altered growth potential (oestradiol status) on the response of intensively-reared steers to variations in UDP concentration. Observed growth responses were compared with those predicted by current protein evaluation schemes (ARC, 1980, 1984).

Nine steers implanted with oestradiol -17β (‘Compudose 365’, Elanco Ltd) and nine non-implanted steers were fed on each of four diets from approximately 130 to 300 kg liveweight. The all-concentrate, iso-energetic diets used supplied a constant level of RDP slightly above that recommended by ARC (1980) and levels of UDP both above and below ARC (1980) recommendations (Table 1).

Dry matter intake was recorded daily and liveweight weekly. The metabolisable energy system (MAFF, 1984) and the ARC (1980, 1984) protein evaluation system were applied to the feed intake and diet composition results recorded during the experiment in order to generate predictions of growth rate for each treatment which could then be compared with the observed growth rate.

Type
Beef Production
Information
Proceedings of the British Society of Animal Production (1972) , Volume 1986 , March 1986 , pp. 24
Copyright
Copyright © The British Society of Animal Production 1986

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References

Agricultural Research Council (1980) The Nutrient Requirements of Ruminant Livestock, Commonwealth Agricultural Bureau, Farnham Royal.Google Scholar
Agricultural Research Council (1984) The Nutrient Requirements of Ruminant Livestock, Supplement 1, Commonwealth Agricultural Bureau, Farnham Royal.Google Scholar
Ministry of Agriculture, Fisheries and Food (1984) Energy allowances and feeding systers for ruminants. HMSO, London.Google Scholar
Newbold, Buttery, Cole, Garnsworthy and Haresign (1985) An. Prod., 40, 532–533 (Abstr.)Google Scholar
UKASTA/ADAS/COSAC (1985) Prediction of the Energy Value of Compound Feeds, UKASTA, ADAS, COSAC.Google Scholar