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The relations between the apparent digestibility of roughages in the rumen and lower gut of sheep, the volume of fluid in the rumen and voluntary feed intake

Published online by Cambridge University Press:  02 September 2010

M. J. Ulyatt ,
K. L. Blaxter  and
I. McDonald
M. J. Ulyatt
Affiliation:
Hannah Dairy Research Institute, Ayr, and The Rowett Research Institute, Bucksburn, Aberdeen
K. L. Blaxter
Affiliation:
Hannah Dairy Research Institute, Ayr, and The Rowett Research Institute, Bucksburn, Aberdeen
I. McDonald
Affiliation:
Hannah Dairy Research Institute, Ayr, and The Rowett Research Institute, Bucksburn, Aberdeen
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Extract

Three sheep with permanent fistulas of the rumen were each given dried grass and two hays, each in three different amounts, and the apparent digesti-bility of the roughages in the rumen and distal to the rumen was determined. A lignin ratio method was used to measure digestibility.

With increase in the amount of the poorest hay given, the proportion digested in the rumen fell and that distal to the rumen increased. With the second hay this effect was also noted but was not statistically significant. The voluntary intakes ofdry matter varied from 1·94 kg/day for the dried grass to 1·28 for the poorest hay. The volumes of distribution of polyethylene glycol in the rumen when feed was offered ad libitum, however, were the same, irrespective of the type of feed, at between 14·1 and 15·2 litres. These observations were confirmed at slaughter. The results support the hypothesis that sheep voluntarily consume roughages of different qualities to achieve constant fill of their rumens, and that little regulation of voluntary intake can be attributed to distension of the hind gut.

Type
Research Article
Information
Animal Production , Volume 9 , Issue 4 , November 1967 , pp. 463 - 470
Copyright
Copyright © British Society of Animal Science 1967

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References

Armstrong, D. G., Blaxter, K. L. & Graham, N. Mcc 1958. Analytical and other techniques used in respiration calorimetry and their errors. Proc. 1st Symposium on Energy Metabolism, Publ. European Association for Animal Production, no. 8: pp. 157–163.Google Scholar
Balch, C. C. 1950. Factors affecting utilization of food by dairy cows. 1. The rate of passage of food through the digestive tract. Br. J. Nutr., 4: 361–388.CrossRefGoogle Scholar
Balch, C. C. 1957. Use of the lignin ratio technique for detemining the extent for digestion i n the reticulo-rumen of the cow. Br. J. Nutr., 11: 213–227.CrossRefGoogle Scholar
Blaxter, K. L., 1964. Utilization of the metabolizable energy of grass. Proc. Nutr. Soc, 23: 62–71.CrossRefGoogle ScholarPubMed
Blaxter, K. L., Wainman, F. W. & Wilson, R. S., 1961. The regulation of food intake by sheep. Anim. Prod., 3: 51–61.Google Scholar
Campling, R. C. 1966. The control of voluntary intake in cattle. Outl. Agric, 5: 74–79.CrossRefGoogle Scholar
Campling, R. C., Freer, M. & Balch, C. C. 1961a. Factors affecting the voluntary intake of food by cows. 1. Preliminary observations on the effect, on the voluntary intake of hay, of changes in the amount of reticulo-ruminal contents. Br. J. Nutr., 15: 523–530.CrossRefGoogle Scholar
Campling, R. C., Freer, M. & Balch, C. C. 1961b. Factors affecting the voluntary intake of food by cows. 2. The relationship between the voluntary intake of roughages, the amount of digesta in the reticulo-rumen and the rate of disappearance of digesta from the alimentary tract. Br. J. Nutr., 15: 531–540.CrossRefGoogle ScholarPubMed
Czerkawski, J., 1965. Estimation of lignin. Proc. Nutr. Soc, 24: xvii.Google Scholar
Ellis, G. H., Matrone, G. & Maynard, L. A., 1946. A 72 per cent H2SO4 method for the determination of lignin and its use in animal nutrition studies. J. Anim. Set., 5: 285–297.CrossRefGoogle Scholar
Freer, M. & Campling, R. C. 1963. Factors affecting the voluntary intake of food by cows. 5. The relationship between the voluntary intake of food, the amount of digesta i n the reticulo-rumen and the rate of disappearance of ingesta from the alimentary tract with diets of hay, dried grass or concentrates. Br. J. Nutr., 17: 79–88.CrossRefGoogle Scholar
Hyden, S., 1956. A turbidimetric method for the determination of higher polyethylene glycols in biological materials. K. LantbrHogsk Annlr., 22: 139–145.Google Scholar
Hyden, S., 1961. The use of reference substances and the measurement of flow in the alimentary tract. In ‘Digestive Physiology and Nutrition of the Ruminant’ Ed. Lewis, D., pp. 35–47. Butterworth, London.Google Scholar
Paloheimo, L., Mskela, A. & Salo, M-L., 1955. Some quantitative data on the role of the ruminant proventriculi in the digestion and absorption of nitrogen-free organic matter. Maataloust. Aikakausk, 27: 70–76.Google Scholar
Waite, R., Johnson, M. J. & Armstrong, D. G., 1964. The evaluation of artificially dried grass as a source of energy for sheep. 1. The effect of stage of maturity on the apparent digestibility of ryegrass, cocksfoot and timothy. J. agric. Sci., Camb., 62: 391–398.CrossRefGoogle Scholar