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Performance and body composition of young steers given stack-ammoniated hay with or without a supplement or untreated hay with a supplement

Published online by Cambridge University Press:  02 September 2010

M. J. Gibb  and
R. D. Baker
M. J. Gibb
Affiliation:
AFRC Institute for Grassland and Animal Production, Hurley, Maidenhead SL6 5LR
R. D. Baker
Affiliation:
AFRC Institute for Grassland and Animal Production, Hurley, Maidenhead SL6 5LR
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Abstract

An experiment was carried out to investigate the performance of young steers given either ammoniated hay alone (TA), or supplemented daily with either 112 g fish meal (TF) or 2 kg barley (TB) or 2 kg barley-based concentrate (TC), compared with untreated hay supplemented with either urea (UU), to raise the nitrogen content of the diet to that of the ammoniated hay, or with 2 kg concentrate (UC). Serial slaughter of animals was carried out to examine the effects on body composition during the winter feeding period and subsequent grazing season.

Ammoniation of the hay significantly increased the in vivo digestibility of organic matter, acid-detergent fibre, neutral-detergent fibre and cellulose fractions (0·672 v. 0·643, 0·740 v. 0·670, 0·758 v. 0·638 and 0·826 v. 0·741, respectively). When offered with 2 kg concentrate, intake of ammoniated hay was higher than that of the untreated hay. Empty body weight gains (EBWG) during the winter period were affected by treatment (174, 225, 293, 590, 631 and 692 g/day for treatments UU, TA, TF, UC, TB and TC, respectively), and were highly correlated with total gross energy intakes (56·0, 61·0, 62·9, 74·5, 73·2 and 83·1 MJ/day, respectively). As the rate of EBWG increased, the fat proportion (g/kg EBW) at turn-out also increased. During the grazing season animals which had been on treatments UU, TA and TF showed a marked degree of compensatory growth (759, 686 and 640 g/day EBWG, respectively) compared with treatments UC, TB and TC (623, 572 and 601 g/day EBWG, respectively), and differential rates of tissue gain. This resulted in reduced, though still significant, differences in EBW, although body composition (g/kg EBW) at final slaughter was similar for all treatments. Thus, whilst short-term advantages in intake and performance can be obtained by ammoniation of hay, the benefits so achieved may not persist due to subsequent compensatory growth at pasture.

Type
Papers
Information
Animal Production , Volume 48 , Issue 2 , April 1989 , pp. 341 - 351
Copyright
Copyright © British Society of Animal Science 1989

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References

REFERENCES

Agricultural Research Council. 1980. Requirements for protein. In The Nutrient Requirements of Ruminant Livestock, pp. 121–181. Commonwealth Agricultural Bureaux, Slough.Google Scholar
Buettner, M. R., Lechtenberg, V. L., Hendrix, K. S. and Hertel, J. M. 1982. Composition and digestion of ammoniated tall fescue {Festuca arundinacea Schreb.) hay. Journal of Animal Science 54: 173–178.Google Scholar
Gibb, M. J. and Baker, R. D. 1987. Performance of young steers offered silage or thermo-ammoniated hay with or without a fish-meal supplement. Animal Production 45: 371–381.Google Scholar
Gibb, M. J. and Baker, R. D. 1988. Performance of young steers offered stack-treated ammoniated hay or untreated hay with or without a supplement. Animal Production 47: 223–229.Google Scholar
Mason, V. C., Cook, J. E., Cooper, E. M., Hoadley, C. J. and Cockburn, J. E. 1989. Oven and stack ammoniation of grass hays. 2. Voluntary intake, digestibility and faecal nitrogen excretion in sheep. Animal Feed Science and Technology In press.Google Scholar
Moore, K. J., Lechtenberg, V. L. and Hendrix, K. S. 1985. Quality of orchardgrass hay ammoniated at different rates, moisture concentrations, and treatment durations. Agronomy Journal 77: 67–71.CrossRefGoogle Scholar
Perdok, H. B. and Leng, R. A. 1987. Hyperexcitability i n cattle fed ammoniated roughages. Animal Feed Science and Technology 17: 121–143.CrossRefGoogle Scholar
Orr, R. J., Treacher, T. T. and Mason, V. C. 1985. The effect of ammonia treatment on the intake of straw and hay when offered with rations of concentrates to ewes in late pregnancy. Animal Production 40: 101–109.Google Scholar
Raymond, F. and Citron, G. 1985. Le traitement a I'ammoniac des pailles et des foins. Perspectives Agricoles 95: suppl.Google Scholar
Tilley, J. M. A. and Terry, R. A. 1963. A two-stage technique for the in vitro digestion of forage crops. Journal of the British Grassland Society 18: 104–111.CrossRefGoogle Scholar