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The effect of ewe body condition at lambing on the performance of ewes and their lambs at pasture

Published online by Cambridge University Press:  27 March 2009

M. J. Gibb  and
T. T. Treache
M. J. Gibb
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks. SL6 5LR
T. T. Treache
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks. SL6 5LR
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Summary

Ewes in body condition scores of 2·4 (thin) or 3·2 (fat) on a 5-point scale and suckling twin lambs were grazed at two stocking rates for the first 16 weeks of lactation. Paddocks were grazed for periods of 2 weeks at densities of 80 and 160 ewes/ha in weeks 1–8 and then 70 and 140 ewes/ha in weeks 9/16 of lactation.

Intakes of herbage by ewes were not significantly affected by body condition. Estimation of milk yield by weekly measurement of secretion rates over 4 h failed to demonstrate significant differences due to body condition except in weeks 9, 11 and 12, although there was a tendency throughout for fat ewes to produce more milk. However, the daily growth rates of the lambs during the first 8 weeks and the overall live-weight gains were significantly higher for lambs suckled by fat ewes than for those suckled by thin ewes. Intake of herbage by lambs was not affected by the body condition of the ewes.

Herbage intakes, milk yields and lamb growth rates were all significantly higher at the low stocking density than at the high stocking density.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 95 , Issue 3 , December 1980 , pp. 631 - 640
Copyright
Copyright © Cambridge University Press 1980

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