MOST Australian sheep flocks have a fertility challenge that presents a significant obstacle to flock rebuilding, according to a New South Wales Government study.

Researchers from the NSW Department of Primary Industries and Regional Development in partnership with The University of Sydney have analysed pregnancy scanning records from more than 7 million ewes.

The 14-year examination of the reproductive performance of Australian sheep incorporated data from every Australian state and territory ensuring a wide cross-section of geographic areas and production systems.

The research observed a relatively low average pregnancy rate of 76 percent for mobs ‘scanned in lamb’ and around 84pc for mobs scanned for twins.

The findings represent a significant obstacle for producers aiming to rebuild their flocks following drought, fire and flood disasters, the researchers believe.

NSW DPIRD livestock systems senior research scientist Dr Gordon Refshauge said the low fertility rates among sheep points to opportunities to improve on-farm production efficiencies.

“This new study utilises real-time ultrasound scanning records that has helped shed a light on reproductive efficiency, identifying critical insights into the factors influencing fertility rates among ewes,” he said.

“Understanding the reproductive performance of our sheep is vital for the sustainability and profitability of the industry as a whole.

“These findings reinforce the importance of monitoring and managing fertility in our flocks to enhance productivity.”

Dr Refshauge said the research highlights several key factors affecting reproductive outcomes, including age, breed, season, and production zone but none of these alone explained the low fertility outcomes.

“It is most likely that ewe and ram nutrition before mating is inadequate in most but not all mobs.

“By focusing on pre-mating liveweight in young ewes and adult ewe body condition, we can significantly improve reproductive performance and, in turn, the overall productivity of our farms,” he said.

“NSW DPIRD is committed to supporting sheep producers with resources and knowledge that can lead to better reproductive management practices, ultimately benefiting the entire industry.”

To view the paper from this study, please visit – https://www.nature.com/articles/s41598-024-67847-4

For more information on NSW DPIRD sheep breeding and research, please visit our website – https://www.dpi.nsw.gov.au/animals-and-livestock/sheep

Best-practice information is also available via the following industry initiatives:

– Making more from sheep, Meat and Livestock (MLA) Australia – https://www.mla.com.au/extension-training-and-tools/making-more-from-sheep

– Lifetime Ewe Management Training Course – Australian Wool Innovation Limited – https://www.wool.com/training-extension/lifetime-ewe-management/

– BredWell, FedWell Hub, MLA – https://www.mla.com.au/extension-training-and-tools/bredwell-fedwell/