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Substitution rates in steers fed on low quality grass hays supplemented with maize grain

Published online by Cambridge University Press:  02 September 2010

F. Torres  and
Cristina Boelcke
F. Torres
Affiliation:
National Institute of Agricultural Technology (INTA), Balcarce Experiment Station, 7620 Balcarce, Argentina
Cristina Boelcke
Affiliation:
National Institute of Agricultural Technology (INTA), Balcarce Experiment Station, 7620 Balcarce, Argentina
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Abstract

To estimate the effect of supplementation on hay: grain substitution rates, 18 experimental rations were evaluated in digestibility trials, each using four steers (300 kg live weight) housed in metabolism stalls. Four hays (digestible dry matter = 40 to 62 %) were given to appetite, supplemented with maize grain plus urea at several different levels, up to 2·5% of animal live weight, and substitution rates were estimated as the slope of the linear regression of hay intake on grain intake. General substitution rates were independent of hay quality, and the pooled rate was 830 g (Sb = 0·036) per kg of grain dry matter. Nevertheless, the analysis of the observed partial substitution rates and those in the literature, suggests a possible interaction between the effects of hay digestibility and grain level on substitution rates.

Type
Research Article
Information
Animal Production , Volume 27 , Issue 3 , December 1978 , pp. 315 - 321
Copyright
Copyright © British Society of Animal Science 1978

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References

REFERENCES

Andrews, R. P., Escuder-volonte, J., Curran, M. K. and Holmes, W. 1972. The influence of supplements of energy and protein on the intake and performance of cattle fed on cereal straws. Anim. Prod. 15: 167–176.Google Scholar
Blaxter, K. L. and Wilson, R. S. 1963. The assessment of a crop husbandry technique in terms of animal production. Anim. Prod. 5: 27–42.Google Scholar
Bravo, B. F. 1973. [Supplementation of grazing steers.] INTA-Balcarce. Dept. Anim. Prod. Rep., pp. 37–38.Google Scholar
Campling, R. C. 1966. The effect of concentrates on the rate of disappearance of digesta from the alimentary tract of cows given hay. J. Dairy Sci. 33: 13–23.Google Scholar
Campling, R. C. and Murdoch, J. C. 1966. The effect of concentrates on the voluntary intake of roughages by cows. J. Dairy Res. 33: 1–11.CrossRefGoogle Scholar
El shazly, K., Dehority, B. A. and Johnson, R. R. 1961. Effect of starch on the digestion of cellulose in vitro and in vivo by rumen microorganisms. J. Anim. Sci. 20:268–273.Google Scholar
Elliott, R. C. 1967. Voluntary intake of low-protein diets by ruminants. 1. Intake of food by cattle. J. agric. Sci., Camb. 69: 375–382.CrossRefGoogle Scholar
Eng, K. S., Riewe, M. E., Craig, J. H. and Smith, J. C. 1964. Rate of passage of concentrate and roughage through the digestive tract of sheep. J. Anim. Sci. 23:1129–1132.CrossRefGoogle Scholar
Johnson, R. R. 1976. Influence of carbohydrate solubility on non-protein nitrogen utilization in the ruminant. J. Anim. Sci. 43: 184–191.CrossRefGoogle ScholarPubMed
Murdoch, J. C. 1967. Factors affecting the voluntary intake of silage and hay. J. Br. GrassldSoc. 22:95–98.CrossRefGoogle Scholar
National Research Council. 1970. Nutrient Requirements of Domestic Animals. No. 4, Nutrient Requirements of Beef Cattle. 4th ed. National Academy of Sciences, Washington, DC.Google Scholar
Ovejero, F. and Chifflet, S. 1976. [Digestibility in vitro of hays using the nylon bag technique.] INTA-Balcarce. Dept. Anim. Prod. A. Rep., pp. 17–19.Google Scholar
Raleigh, R. J. and Wallace, J. D. 1963. Effect of urea at different nitrogen levels on digestibility and on performance of growing steers fed low quality flood meadow roughage. J. Anim. Sci. 22: 330–334.CrossRefGoogle Scholar
Terry, R. A.Tilley, J. M. A. and Outen, G. E. 1969. The effect of pH on cellulose digestion under in vitro conditions. J. Sci. Fd Agric. 20: 317–320.CrossRefGoogle Scholar
Thompson, J. T., Bradley, N. W. and Little, C. O. 1964. Ruminal volatile fatty acid concentrations and performance of steers fed different levels of hay and grain. J. Anim. Sci. 23: 895 (Abstr.).Google Scholar
Torres, F. and Boelcke, C. 1976. Grain supplementation of low quality grasses. Proc. int. Symp. Feed Composition, Nutrient Requirements and Computerization of Diets, Logan Utah, pp. 408–14.Google Scholar
Van soest, P. J. 1966. Nonnutritive residues: a system of analysis for the replacement of crude fiber. Ass. off. agric. Chem. 49: 546–551.Google Scholar
Waldo, D. R. 1968. Symposium: Nitrogen utilization by the ruminant. Nitrogen metabolism m the ruminant. Dairy Sci. 51: 265–275.CrossRefGoogle Scholar