Volume 22 • Issue 01 • 2018
will greatly slow down resistance and then
individuals needing treatment can be identified
and culled.
Use sound calculations to evaluate flocks. Lambing
and weaning percentages must be done on ewes
mated during that breeding season. Also discard
any lambs not reared by ewes. In more than once
a year breeding systems, ewes are often moved to
the next group if she does not conceive and then
lambing and weaning gets calculated on ewes
pregnant and not ewes mated.
For more complex selections the most efficient
animals must be selected rather than the biggest
producers for example using weaning efficiency
rather than absolute weaning weight of lambs
will ensure optimal production. Selection must
also be dynamic and re-evaluation must be done
annually. For a comprehensive flock evaluation,
the following information is recorded: ewes
mated, lambs born alive and dead per week.
Lamb mortalities on weekly basis with main
causes. Lambs weaned, lamb weight at weaning,
ewe weight at weaning. Ewe treatments per year.
General management program – dosing, dipping,
footbaths and other disease control. Vaccinations.
Supplements. Nutrition. Breeding management.
Rams. New technology: SNP chips are currently
being developed which will make selecti on for
complex traits possible at an early age. However,
they are not cost effective for commercial farming
currently.
References
Precision Livestock Farming - Data and technology in
farm animals; issue.com, hashogechool.
AHDB Beef and Lamb – United Kingdom
Meat and Livestock Australia
Sheepcrc.org.au: transforming wool, meat and the
sheep that produce them
Sustainable sheep production and consumer
preference trends: Compatibilities, contradictions,
and unresolved dilemmas F. Montossi a, ⁎, M. Font-i-
Furnols b , M. del Campo a , R. San Julián a , G. Brito a ,
C. Sañudo, Meat Science 92 (2013)
Breeding ewe lambs successfully to improve lifetime
performance. Kenyon, PR et al. Small ruminant
research 118(2014) p2-15
Foetal programming in sheep- effects on production.
Kenyon, PR and Blair, HT. Small ruminant research
118(2014) p16-30
Breeding strategies to make sheep farms resilient
to uncertainty Ian James Rose Thesis committee
Promotor Prof. Dr J.A.M. van Arendonk Professor of
Animal Breeding and Genomics Wageningen University
Co-promotor Dr H.A. Mulder Assistant professor,
Animal Breeding and Genomics Centre Wageningen
Universit
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