Making More from Sheep Australian Wool Innovation Limited Meat & Livestock Australia
MODULE 10: Wean More Lambs
Tool 10.7
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Scanning is used to identify multiple pregnancies to better manage twin bearing ewes and to identify and remove barren ewes. Careful consideration needs to be made of the costs and benefits of pregnancy scanning to achieve a management and economic gain in the breeding ewe enterprise.

Skilled contractors can scan ewes to age the foetuses either in the first or second cycle. This information can be used to better allocate feed for pregnant ewes and limit the number of ewes in lambing paddocks at one time.

Benefits of Pregnancy Scanning

Disadvantages of Pregnancy Scanning

More precise flock and lambing paddock management

More mobs to manage and stress of extra handling in some seasons

More targeted use of feed supplements when
economically justified or allocation of dry, single
bearing and twin bearing ewes to appropriate feed
resources

More labour intensive when scanning and managing for multiple births

Targeted management (more shelter and privacy) of
twin bearing ewes to protected paddocks to
improve lamb survival

Potential for mismothering when twinning mobs are run together under high stocking rates at lambing

Non-pregnant ewes can be run as dry sheep for wool
production or culled and sold if feed resources
are limited

Late lambing mob to manage where dry ewes are rejoined and the normal breeding cycle on the farm is disrupted

Basis for careful fodder budgeting and forward planning
of pasture utilisation to achievehigh reproduction rates
and/or target markets

Potentially an additional and unnecessary cost in low twinning flocks

Likely to be most cost effective in drought years or when
ewes are mated at low condition score and maidens
at low body weight

More precise management required and this may compete with other farm operations

Twins can be managed with better pasture in lambing
mobs with a high proportion of twins. They can be run in
protected where twins are separated there could be a
saving in supplementary feed costs

Opportunity cost of scanning and extra labour

May identify where reproductive losses are in the breeding cycle