+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Effect of divergent selection for weaning weight on liveweight and wool growth responses to feed intake in Merino ewes

Australian Journal of Experimental Agriculture 33(6): 699-705
Effect of divergent selection for weaning weight on liveweight and wool growth responses to feed intake in Merino ewes
During a 6-week experiment, the feed requirements for maintenance of liveweight (LW) by adult Merino ewes were measured in 2 flocks selected over 32 years for divergent weaning weight. Also examined were the net efficiency of LW gain and wool growth in response to change in feed intake, and the ability to digest dietary organic matter. Ewes selected for high weaning weight (W+) were 31% heavier than those selected for low weaning weight (W-) at the start of the experiment. To maintain LW, W+ ewes ate 24% more digestible organic matter (DOM) per day than ewes. There were no differences (P gt 0.2) in the net efficiency of feed use for LW gain. The W+ ewes digested more (P lt 0.01) dietary organic matter, by 1.8 percentage units, than W- ewes and, consequently, required only 22% more dry feed to maintain their heavier LW. Ewes from the 2 flocks did not differ (P gt 0.4) in the amount of wool grown, and as W+ ewes were larger, they produced less (P lt 0.01) wool per kg LW for the same DOM intake.

Accession: 002355206

DOI: 10.1071/EA9930699

Related references

Feed requirements of Merino ewes following divergent selection for weaning weight. Proceedings of the Nutrition Society of Australia 16: 212, 1991

Selection for weaning weight in Merino sheep. 3. Maintenance requirements and the efficiency of conversion of feed to wool in mature ewes. Aust. J. exp. Agric. Anim. Husb, 7: 117-125, 1967

Feed intake, liveweight and wool growth rate in Merino sheep with different responsiveness to low- and high-quality feed. Australian Journal of Experimental Agriculture 42(4): 399-405, 2002

Consequences of reproduction on the liveweight, fat depth, wool growth, and intake of grazing Merino ewes in the short and long term. Australian Journal of Experimental Agriculture 35(2): 153-159, 1995

Feed intake, liveweight gain and wool growth of Merino wethers fed grass or legume hays. Proceedings of the Australian Society of Animal Production 18: 545, 1990

The effect of gastrointestinal nematodes on the performance of Corriedale and Merino ewes. I. Liveweight and wool growth. Produccion Ovina 12: 51-62, 1999

Performance of crossbred progeny of Trangie Fertility Merino and Booroola Merino rams and Poll Dorset ewes: 3. Reproduction, liveweight and wool production of adult ewes. Australian Journal of Experimental Agriculture 35(8): 1083-1091, 1995

Effect of selection for fleece weight on liveweight, reproductive performance and wool characteristics in mixed age Romney ewes. Proceedings of the New Zealand Society of Animal Production 59: 27-29, 1999

Wool growth of pregnant merino ewes fed to maintain maternal liveweight. Australian Journal of Experimental Agriculture 29(4): 503-508, 1989

Effect of age at weaning on growth of lambs and milk and wool production of ewes of the Central Anatolian Merino breed. Hayvanclk Arastrma Dergisi 2(2): 1-7, 1992