Author:
Holst P. J.,Hall D. G.,Stanley D. F.,Nolan J. V.
Abstract
Summary. The response of 96 weaner, crossbred lambs to
oat grain on lucerne pasture was examined where they were fed in single sex
ewe or cryptorchid groups or in mixed sex groups. All groups had a similar
profile of weights (range 16–34 kg). Intakes of lucerne and air dry oats
fed daily in troughs at 300 g/head and later at 200 g/head were
estimated at intervals over 4 weeks commencing 4 weeks after weaning.
Overall mean (± s.e.) growth rate (cryptorchid 144 ± 6 v. female
115 ± 7 g/day) of cryptorchid or female lambs was not significantly
different when fed as a single sex group or combined.
Intake of supplement when offered up to 300 g, was not affected by sex of lamb
but was significantly (P<0.001) affected by
liveweight at the start of the experiment. Mean initial liveweight of lambs
that consistently ate least supplement was 20.0 kg compared with 26.1 kg for
the remainder and they were 12 days younger than the remainder. The behaviour
of some of these lighter lambs at feeding suggested that a form of dominance
was operating.
Cryptorchid lambs ate more lucerne pasture than female lambs at the same
liveweight (746 v. 586 g dry matter at the middle, and
904 v. 759 g dry matter at the end of the experiment).
We conclude that our weaner crossbred lambs did not need to be segregated on
sex for supplementary feeding on pasture. However, many of the lightest lambs
were shy feeders and could benefit from segregation. Shy feeders represented
11% of this flock.
Subject
General Agricultural and Biological Sciences
Cited by
3 articles.
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