SUBLETHAL EXPOSURE TO CORYNETOXINS AFFECTS PRODUCTION OF GRAZING SHEEP

This paper reports the production losses resulting from treating sheep with sublethal doses of corynetoxins, the causal agent of annual ryeg rass toxicity. Merino ewes were given 3 levels of corynetoxins twice w eekly for 11 weeks from 26 days before the start of joining to day 51 of pregnancy, giving a cumulative dose of 0, 0.4 or 0.8 mg/kg liveweig ht. The effect on ovulation, pregnancy, lamb birth weight, lamb surviv al and weaning weight were measured along with the liveweight and wool growth of the ewes. Corynetoxin treatment depressed (P<0.005) the act ivity of uridine diphospho-N-acetylglucosamine: dolichol-phosphate N-a cetylglucosamine-1-phosphate transferase and liver damage was detected in ewes on the high toxin treatment (P<0.05). Ewe liveweight was unaf fected by treatment but wool growth and wool fibre diameter were reduc ed by 10 and 7%, respectively (P<0.05). Corynetoxin treatment appeared to increase ovulation (P<0.05) and, as there was no effect on concept ion and embryo survival, this resulted in a 30-35% increase in the num ber of lambs weaned. Lamb birth weight and survival were not affected by treatment but weaning weight of the low toxin group was depressed ( P<0.05). While reproduction was not adversely affected, the sheep in t his trial were exposed to extremely low levels of corynetoxins which d id not accumulate to levels capable of causing detectable liver damage until 23 days after joining. Even at these levels of intake, well bel ow those required to show clinical signs (3-5 mg/kg liveweight), wool growth was reduced, suggesting that sheep grazed on mildly toxic pastu re experience wool production losses in the absence of signs of the cl inical disease.