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A comparison of the sown swards of perennial ryegrass S. 24 and Italian ryegrass RvP in a two-year lamb production system, with different breeds of sheep

Published online by Cambridge University Press:  27 March 2009

J. E. Newton ,
N. E. Young  and
R. J. Orr
J. E. Newton
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks.
N. E. Young
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks.
R. J. Orr
Affiliation:
The Grassland Research Institute, Hurley, Maidenhead, Berks.
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Summary

A comparison was made between an intensive system of lamb production based on Italian ryegrass RvP and one based on perennial ryegrass S. 24, over 2 years, each at three stocking rates (14, 17, 20 ewes/ha). More grass was grown in the first year than in the second when the yield of RvP was particularly reduced. The ewes and lambs ate more RvP than S. 24 but there was no difference in lamb growth rate. The lambs grew faster at the low stocking rate from 0 to 18 weeks and from 0 to slaughter than at the medium and high stocking rates, in both years. Ewe intake and lamb growth rate were higher in the second year than the first. The Masham ewes with two lambs ate significantly more grass per unit of body weight than the Finnish Landrace × Scottish Halfbred and Finnish Landrace × Scottish Blackface ewes, and their lambs grew significantly faster. It was concluded that for an intensive system of lamb production from grass, S. 24 was more suitable than RvP.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 87 , Issue 3 , December 1976 , pp. 605 - 616
Copyright
Copyright © Cambridge University Press 1976

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