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Effects of alternative protein and energy sources on the metabolism and performance of straw fed, pregnant and lactating ewes

Published online by Cambridge University Press:  20 November 2017

D. Handford
Affiliation:
ASRC, School of Agriculture, Harper Adams University College, Edgmond, Newport, Shropshire TF10 8NB, UK
S.E. Pattinson
Affiliation:
ASRC, School of Agriculture, Harper Adams University College, Edgmond, Newport, Shropshire TF10 8NB, UK
L.A. Sinclair
Affiliation:
ASRC, School of Agriculture, Harper Adams University College, Edgmond, Newport, Shropshire TF10 8NB, UK
R.G. Wilkinson
Affiliation:
ASRC, School of Agriculture, Harper Adams University College, Edgmond, Newport, Shropshire TF10 8NB, UK
S.P. Marsh
Affiliation:
Rumenco, Stretton House, Burton on Trent, Staffordshire, DE13 ODW, UK
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Extract

Fishmeal is a suitable protein source for pregnant and lactating ewes, providing high levels of undegradable protein (UDP) with a high biological value (Sheehan and Hanrahan, 1989). Vegetable protein sources supply a lower proportion of UDP and lack in supply of essential amino acids, but the quality can be improved by heat / chemical treatment and by adding amino acids. It has also been shown that concentrates can be partially replaced by supplementary feed blocks based on soluble sugars and urea with no adverse effects on production and simplifying the feeding regime (Chapple et al, 1996). The objective of the current experiment was to compare the effects of feeding barley based concentrates containing either fishmeal or a protected vegetable protein as the main protein source and the partial replacement of concentrates with a supplementary feed based on soluble sugars and urea (blocks) on the performance and metabolism of pregnant and lactating ewes.

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Copyright
Copyright © The British Society of Animal Science 1999

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References

Chapple, D.G., Wheeler, K.P.A. and Marsh, S.P. (1996). A comparison of food blocks or compound supplementary feeding systems for twin-bearing ewes during pregnancy and lactation. Animal Science 62: 669 (abstr).Google Scholar
Sheehan, W. and Hanrahan, J.P. (1989). A comparison of soyabean meal and fish meal as protein supplements for the lactating ewe. Irish Journal of Agricultural Research 28, 133140.Google Scholar

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