The number of lambs weaned per ewe is an important factor contributing to both the level of production and producer income. The production and gross margins resulting from varying pregnancy rate, twinning rate, and the use of flushing were compared for a Terminal over Merino ewe enterprise using simulation modelling of a farm at Tarcutta (New South Wales) with 20% of area sown to lucerne. A 20% lower pregnancy rate had a larger impact on gross margins than a 50% reduction in twinning rate. Flushing, on average, increased lamb production and gross margins compared with the standard, but was only possible in 50% of years. On-farm management which avoids reductions in pregnancy rate may be more important for producers than aiming to increase twinning rate, but large gains are possible by flushing ewes to increase twinning rates if this can be achieved frequently and the survival of twins is high.
|Number of pages||2|
|Publication status||Published - 2016|
|Event||31st Biennial Conference of the Australian Society of Animal Production: Animal Production 2016 - Stamford Grand Adelaide, Glenelg, Australia|
Duration: 04 Jul 2016 → 07 Jul 2016
http://www.asap.asn.au/2016-conference/ (Conference website)
http://www.asap.asn.au/wp-content/uploads/2016/11/AP2016-Proceedings_Brief-Communications_LR.pdf (Conference proceedings)
|Conference||31st Biennial Conference of the Australian Society of Animal Production|
|Period||04/07/16 → 07/07/16|
Robertson, S., & Friend, M. (2016). Modelling the potential for flushing or improved pregnancy rate to increase gross margins for sheep flocks. 1-2. Abstract from 31st Biennial Conference of the Australian Society of Animal Production, Glenelg, Australia.