The Thai Journal of Veterinary Medicine


The effect of regular anthelmintic treatment on the live weight gains, reproductive rates and mortality rate of sheep raised in the highlands of northern Thailand were studied. A significant difference in liveweight gain was only recorded during the wet season in the German Merino Thai Indigenous breed of sheep in favour of the group receiving anthelmintic treatment. Reproductive rates were 58% for the treated group compared with 33 % for the control group and mortality rates were 0% compared with 25 %. Faecal egg counts indicated that infestations may be higher during the wet season. The internal parasite burdens of sheep that died during the experimental period and of two sheep slaughtered at the conclusion of the experiment are also presented.


Faculty of Veterinary Science, Chulalongkorn University

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