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Individual intake variation in ewes given feedblock or trough supplements indoors or at winter grazing

Published online by Cambridge University Press:  02 September 2010

P. T. Kendall ,
M. J. Ducker  and
R. G. Hemingway
P. T. Kendall
Affiliation:
Department of Animal Husbandry, Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH
M. J. Ducker
Affiliation:
Department of Animal Husbandry, Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH
R. G. Hemingway
Affiliation:
Department of Animal Husbandry, Glasgow University Veterinary School, Bearsden, Glasgow G61 1QH
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Abstract

Individual dry matter intakes were measured using four groups of 16 ewes, indoors or at sparse winter grazing. In periods of varying duration (14 to 35 days) the ewe groups received 14 feedblock supplements competitively, eight trough supplements competitively or two feedblock supplements individually. In each period hay was available ad libitum. All supplements contained chromic oxide and individual supplement intakes were estimated by total faecal collection. Individual hay and total dry-matter intakes were estimated by faecal apportionment according to indigestibility of dietary components.

Metabolizable energy content (0·81 × digestible energy) of the feedblocks ranged from 7·9 to 9·2 MJ/kg dry matter compared with a value of 13·0 MJ metabolizable energy/kg dry matter for concentrates. The variation in individual supplement intake was large, irrespective of type of supplement. However the mean coefficient of intake variation for 14 feedblock supplements (0·56) significantly (P < 0·05) exceeded that (0·39) for eight trough supplements at equivalent mean dry-matter intakes.

Thus, ‘free-access’ feedblocks did not allow a more uniform supplementation than trough supplements. Supplement intake variation was higher outdoors and increased as total feedblock intake reduced.

The variation in individual hay and total dry-matter intake was lower, and generally independent of that for the supplements. Mean coefficient of variation of 0·24 and 0·22 were obtained for hay and total dry matter, respectively, based on 22 collections with competitively fed sheep.

Total daily metabolizable energy intakes of individual ewes outdoors ranged from 5 to 22 MJ per collection.

Type
Research Article
Information
Animal Production , Volume 36 , Issue 1 , February 1983 , pp. 7 - 19
Copyright
Copyright © British Society of Animal Science 1983

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References

REFERENCES

Beames, R. M. and Morris, J. G. 1965. Effect of salt urea blocks on bodyweight, body composition and wool production of sheep fed low protein native grass hay. Qd J. Agric. Anim. Sci. 22: 369–379.Google Scholar
Clark, R. and Quinn, J. T. 1951. Studies on the alimentary tract of Merino sheep in South Africa. 23. The effect of supplementing poor quality grass hay with molasses and nitrogen salts. Onderstepoort J. vet. Res. 25: 93–103.Google Scholar
Coombe, J. B. and Tribe, D. E. 1963. The effects of urea supplements on the utilization of straw plus molasses diets by sheep. Aust. J. agric. Res. 14: 70–92.CrossRefGoogle Scholar
Ducker, M. J., Kendall, P. T., Hemingway, R. G. and Mcclelland, T. H. 1981. An evaluation of feedblocks as a means of providing supplementary nutrients to ewes grazing upland/hill pastures. Anim. Prod. 33: 51–57.Google Scholar
Foot, Janet Z. and Russel, A. J. F. 1973. Some nutritional implications of group-feeding hill sheep. Anim. Prod. 16: 293–302.Google Scholar
Foot, Janet Z., Russel, A. J. F., Maxwell, T. J. and Morris, P. 1973. Variation in intake among group-fed pregnant Scottish Blackface ewes given restricted amounts of food. Anim. Prod. 17: 169–177.Google Scholar
Kendall, P. T. 1977. Studies in the use of feedblocks for ruminants. Ph. D. Thesis, Univ. Glasgow.Google Scholar
Kendall, P. T., Hemingway, R. G. and Ducker, M. J. 1980. Variation in probable feed intake of ewes given concentrates with varying trough space allowance or self-help feedblocks. Proc. Nutr. Soc. 39:16A. (Abstr.).Google ScholarPubMed
Lobato, J. F. P., Pearce, G. R. and Tribe, D. E. 1980. Measurement of the variability in intake by sheep of oat grain, hay and molasses-urea blocks using chromic oxide as a marker. Aust. J. exp. Agric. Anim. Husb. 20: 413–416.CrossRefGoogle Scholar
Ministry of Agriculture, Fisheries and Food, Department of Agriculture AND Fisheries for Scotland and Department of Agriculture for Northern Ireland. 1975. Energy allowances and feeding systems for ruminants. Tech. Bull. 33. Her Majesty's Stationery Office, London.Google Scholar
Williams, C. H., David, D. F. and Iismaa, O. 1962. The determination of chromic-oxide in faecal samples by atomic absorption spectrophotometry. J. agric. Sci., Camb. 59:381–385.CrossRefGoogle Scholar
Williams, N. M., Pearce, G. R., Delany, M. and Tribe, D. E. 1959. The growth and appetite of sheep on high fibre, low protein diets supplemented with urea and molasses. Emp. J. exp. Agric. 27: 107–116.Google Scholar