| dc.creator |
Greeff, Johan |
|
| dc.creator |
Karlsson, L.J.E. |
|
| dc.date |
2006-04-04 |
|
| dc.date.accessioned |
2011-12-10T10:44:37Z |
|
| dc.date.available |
2011-12-10T10:44:37Z |
|
| dc.date.issued |
4/04/2006 |
|
| dc.identifier |
http://livestocklibrary.com.au/handle/1234/4302 |
|
| dc.identifier.uri |
http://sheepjournal.net/index.php/ijsws/article/view/724 |
|
| dc.description |
\"Resistance of sheep worms against the available anthelmintic drenches is increasing. Breeding sheep for resistance against gastrointestinal parasites is the only long-term solution. Research has shown that breeding for worm resistance is a highly feasible option and that genetic gains of more than 2% per year can be achieved without loss of production. Replicated field trials in which resistant animals were managed separately from unselected control sheep showed that there was a 10-fold difference in worm egg counts between resistant and control ewes. Resistant ewes were 18% heavier than the controls at the time of peak worm-challenge in a Mediterranean environment. At weaning, there was a five-fold difference in worm egg counts between resistant and control lambs, which resulted in an improvement of weaning weight of up to 22%. It is therefore better to include selection for worm resistance in breeding programs than to omit it for fear of diminishing future genetic gains in other traits.
\" |
|
| dc.format |
application/pdf |
|
| dc.language |
|
|
| dc.publisher |
International Journal of Sheep and Wool Science |
|
| dc.source |
International Journal of Sheep and Wool Science; Vol 54, No 2 (2006) |
|
| dc.source.uri |
http://sheepjournal.net/index.php/ijsws/article/view/724 |
|
| dc.title |
Breeding for worm resistance- whole farm benefits |
|
| dc.type |
Peer-reviewed Article |
|