New Zealand Journal of Agricultural Research abstracts
Short communication
Effect of liveweight and teasing of ewe hoggets prior to breeding on lambing pattern and weight of singleton lambs
P. R. Kenyon
P. C. H. Morel
D. M. West
S. T. Morris
College of Sciences
Massey University
Private Bag 11 222
Palmerston North, New Zealand
p.r.kenyon@massey.ac.nz
Abstract The aim of the present study was to
determine the effects of teasing on hogget lambing date, and to
determine the effects of hogget liveweight at breeding and teasing on
birthweights and growth rates of singleton lambs to weaning. Teasing
resulted in a significantly (P < 0.001)
earlier average lambing date without affecting either birth weight or
lamb growth rates to weaning. This result suggests that the main
benefit farmers can achieve from teasing hoggets prior to breeding is
through an increase in the number of hoggets pregnant, rather than
through an increase in lamb weaning weights due to earlier born lambs,
as the affect on lamb weaning weight was only minor. Liveweight of
hoggets pre-mating had a small, but significant (P < 0.001)
positive effect on both birthweights and growth rates of singleton
lambs to weaning. In addition, birthweight had a small significant (P < 0.001)
positive effect on lamb growth rate to weaning. These results indicate
that to achieve heavier weaning weights of lambs born to hoggets, or to
allow for the option of weaning earlier, farmers should ensure hoggets
attain adequate liveweights pre-mating. This affect would be additive to the known positive effects of hogget breeding liveweight on reproductive performance.
Keywords liveweight of hoggets; ewes; teasing; lamb birthweight; lamb growth rate
A05068; Received 2 December 2005; accepted 15 May 2006; Online publication date 13 July 2006
New Zealand Journal of Agricultural Research, 2006, Vol. 49: 341–347
0028–8233/06/4903–0341 © The Royal Society of New Zealand 2006
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