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A comparison of supplementary sources of nitrogen and energy for increasing the voluntary intake and utilization of barley straw by sheep

Published online by Cambridge University Press:  27 March 2009

T. N. Barry  and
P. D. Johnstone
T. N. Barry
Affiliation:
Invermay Agricultural Research Centre, Mosgiel, New Zealand
P. D. Johnstone
Affiliation:
Invermay Agricultural Research Centre, Mosgiel, New Zealand
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Summary

Chopped barley straw was fed ad libitum to penned Romney wether sheep. Supplements of urea, ground wheat grain + urea, lucerne hay and autumn saved pasture (ASP) were given for five periods each of 3 weeks using a 5 × 5 Latin square design. The latter three supplements supplied similar amounts of nitrogen and approximately 20% of the energy required for maintenance.

The concentration of ammonia in the rumen fluid of sheep fed the basal straw diet was low and was increased by all the supplements. The concentration of total volatile fatty acids (VFA) in rumen fluid was unaffected by supplementation with urea, but was increased by the three supplements of nitrogen and energy. Differences in VFA molar proportions between treatments were small.

Sheep offered straw alone had a digestible energy (DE) intake of 69% of maintenance and showed a weight loss of 121 g/day. Supplementation with urea had no effect upon apparent energy digestibility (42%) or voluntary intake, but significantly reduced the rate of live-weight loss. The lucerne hay and ASP supplements also had no effect upon straw consumption, but increased total DE intake to 87% of maintenance due to the additional energy provided by the supplements, and reduced live-weight loss. Supplementation with wheat + urea increased the estimated amount of digestible organic matter derived from straw by 8·5%, increasing DE intake to 94% of maintenance and reducing live-weight loss to 18 g/day.

Averaged over all five groups of animals, straw intake increased by 9% in the second period of feeding and then gradually decreased with time, reaching a value in period 5 which was similar to period 1.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 86 , Issue 1 , February 1976 , pp. 163 - 169
Copyright
Copyright © Cambridge University Press 1976

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References

REFERENCES

Andrews, R. P., Escuder-Volonate, J., Curran, M. J. & Holmes, W. (1972). The influence of supplements of energy and protein on the intake and performance of cattle fed on cereal straws. Animal Production 15, 167–76.Google Scholar
Barry, T. N. (1973). Effect of treatment with for maldehyde and intraperitoneal supplementation with DL-methionine on the digestion and utilization of a hay diet by sheep. 1. The digestion of energy and nitrogen. New Zealand Journal of Agricultural Research 16, 185–9CrossRefGoogle Scholar
Barry, T. N, Drew, K. R. & Duncan, S. J. (1971). The digestion, voluntary intake, and utilization of energy by Romney hoggets fed five winter forage crops. New Zealand Journal of Agricultural Research 14, 835–46.CrossRefGoogle Scholar
Beever, D. E., Thomson, D. J. & Harrison, D. G. (1974). Energy and protein transformations in the rumen, and the absorption of nutrients, by sheep fed forage diets. Proceedings of 12th International Grassland Congress, Moscow. Grassland Utilization. Part 1, 69–74.Google Scholar
Bray, A. C. & Hemsley, J. A. (1969). Sulphur metabolism of sheep. IV. The effect of a varied dietary sulphur content on some body fluid sulphate levels and on the utilization of urea-supplemented roughage by sheep. Australian Journal of Agricultural Research 20, 759–73.CrossRefGoogle Scholar
Coombe, J. B. & Preston, G. K. (1969). The effect of urea on the utilization of ground, pelleted roughage by penned sheep. 1. Food intake, liveweight change and wool growth. Journal of Agricultural Science, Cambridge 72, 251–9.CrossRefGoogle Scholar
Coombe, J. B., Christian, K. R. & Holgate, M. D. (1971). The effect of urea on the utilization of ground, pelleted roughage by penned sheep. III. Mineral supplements. Journal of Agricultural Science, Cambridge 77, 159–74.CrossRefGoogle Scholar
Coop, I. E. (1962). The energy requirements of sheep for maintenance and gain. 1. Pen fed sheep. Journal of Agricultural Science, Cambridge 58, 179–86.CrossRefGoogle Scholar
Crabtree, J. R. & Williams, G. L. (1971). The voluntary intake and utilization of roughage–concentrate diets by sheep. Animal Production 13, 71–82.Google Scholar
Drew, K. R. (1966). The in vitro prediction of herbage digestibility. Proceedings of the New Zealand Society of Animal Production 26, 52–70.Google Scholar
Egan, A. R. (1965 a). Nutritional status and intake regulation in sheep. II. The influence of sustained duodenal infusions of casein or urea upon voluntary intake of low-protein roughages by sheep. Australian Journal of Agricultural Research 16, 451—62.CrossRefGoogle Scholar
Egan, A. R. (1965 b). Nutritional status and intake regulation in sheep. III. The relationship between improvement of nitrogen status and increase in voluntary intake of low-protein roughages by sheep. Australian Journal of Agricultural Research 16, 463–72.CrossRefGoogle Scholar
Fick, K. R., Ammerman, C. B., McGowan, C. H., Loggins, P. E. & Cornell, J. A. (1973). Influence of supplemental energy and biuret nitrogen on the utilization of low quality roughage by sheep. Journal of Animal Science 36, 137–43.CrossRefGoogle Scholar
Fishwick, G., Hemingway, R. G., Parkins, J. J. & Ritchie, N. S. (1973). A note on the effect of urea contained in a molassed sugar beet pulp cube on the voluntary intake and digestibility of oat straw by steers. Animal Production 17, 205–8.Google Scholar
Kennedy, P. M. & Siebert, B. D. (1972). The utilization of spear grass (Heteropogan Contortus). III. The influence of the level of dietary sulphur on the utilization of spear grass by sheep. Australian Journal of Agricultural Research 24, 143–52.CrossRefGoogle Scholar
Langlands, J. P. (1969). The feed intake of sheep supplemented with varying quantities of wheat whilst grazing pastures differing in herbage availability. Australian Journal of Agricultural Research 22, 919–24.CrossRefGoogle Scholar
Morris, J. G. (1966). Supplementation of ruminants with protein and non-protein nitrogen under Northern Australian conditions. Journal of the Australian Institute of Agricultural Science 32, 185–95.Google Scholar
Morris, J. G. & Gulbransen, B. (1970). Effect of nitrogen and energy supplements on the growth of cattle grazing oats or Rhodes grass. Australian Journal of Experimental Agriculture and Animal Husbandry 10, 379–83.CrossRefGoogle Scholar