Does phenotypic selection for fleece weight reduce lamb survival?

PG Refshauge, S Hatcher, G Hinch, DL Hopkins, SG Nielsen

Research output: Book chapter/Published conference paperConference paper

Abstract

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).
Original languageEnglish
Title of host publicationGenetic Improvement
Subtitle of host publicationMaking it Happen
Place of PublicationAustralia
PublisherDPI/University of New England
Pages561564
Number of pages1
ISBN (Electronic)1921208139
Publication statusPublished - 2007
Event17th Conference of the Association for the Advancement of Animal Breeding & Genetics - Armidale, NSW, Australia
Duration: 24 Sep 200726 Sep 2007

Conference

Conference17th Conference of the Association for the Advancement of Animal Breeding & Genetics
CountryAustralia
Period24/09/0726/09/07

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  • Cite this

    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.