A two year field experiment studied the impact of phenotypic selection for clean fleece weight on whole ewe performance. The ewes were managed at a high or low stocking rate during gestation and from marking to weaning. Post-mortem autopsy was undertaken on all lambs found dead (25%) during lambing in each year. Of those lambs with stomachs present for post-mortem, 92% had not fed. Birthweight and birth type significantly affected post-natal mortality and dystocia (slow or difficult labour or delivery) was responsible for 61% of all deaths. Fat score at mid-pregnancy was significantly and positively associated with post-natal mortality. Fat score in late pregnancy had a significant negative relationship with birthweight. Clean fleece weight did not affect fat score at mid-pregnancy or post-natal mortality (P = 0.059).
|Title of host publication||Genetic Improvement|
|Subtitle of host publication||Making it Happen|
|Place of Publication||Australia|
|Publisher||DPI/University of New England|
|Number of pages||1|
|Publication status||Published - 2007|
|Event||17th Conference of the Association for the Advancement of Animal Breeding & Genetics - Armidale, NSW, Australia|
Duration: 24 Sep 2007 → 26 Sep 2007
|Conference||17th Conference of the Association for the Advancement of Animal Breeding & Genetics|
|Period||24/09/07 → 26/09/07|
Refshauge, PG., Hatcher, S., Hinch, G., Hopkins, DL., & Nielsen, SG. (2007). Does phenotypic selection for fleece weight reduce lamb survival? In Genetic Improvement: Making it Happen (pp. 561564). DPI/University of New England.