排序方式: 共有58条查询结果,搜索用时 0 毫秒
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Robson RV Alves Tatiana Soares Elinaldo FL Bento Ricardo S Roldan‐Filho Brbara SS Souza Marcele KN Lima Jssica S Nascimento Luana CBB Coelho Roberto A S Thmarah A Lima Gabriel GA Gonalves Fbio A Brayner Luiz C Alves Daniela MAF Navarro Thiago H Napoleo Patrícia MG Paiva 《Pest management science》2020,76(2):730-736
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The efficacy of a topical formulation of ivermectin against naturally acquired gastro-intestinal nematodes in weaner cattle was evaluated. At slaughter, 14-15 days after treatment, burdens of Ostertagia spp, Trichostrongylus axei and Oesophagostomum radiatum were significantly lower in the treated calves than in the untreated controls (p<0.01). Efficacies (based on geometric mean worm burdens of treated and control groups) were 99.6%, 95.1% and 100% respectively. The sizes of the Cooperia spp and Trichuris ovis burdens in the treated group did not differ significantly at the 5% level of confidence from those in the control group. 相似文献
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R.V. Brunsdon M.Sc. Ph.D. 《New Zealand veterinary journal》2013,61(9):161-172
In the three years from October 1979 to September 1982 over 6.3 million lambs were processed in two meat works and of these 0.5% had lesions of contagious pustuiar dermatitis (CPD). The proportion of iambs affected was highest in the months of December and January when up to 2.2% of the Iambs slaughtered had lesions of CPD. On average 13.4% of a consignment (referred to as a line) of lambs showing evidence of CPD were affected. The total lambs in affected lines constituted 4.1% of the total slaughtered. If it was decided to reject for slaughter lines with CPD, approximately 1¼ million lambs would be returned to farms each year. It was concluded that such a policy would be unlikely to substantially reduce the level of infection in meat workers. 相似文献
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R.V. Brunsdon M.Sc. Ph.D. 《New Zealand veterinary journal》2013,61(4):47-54
Extract A Mastitis control programme is essentially a biological regulatory system involving the three essential components of any control mechanism:
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A signal from a detector indicating departure from normality
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The interpretation of the signal (diagnosis)
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A feed-back signal to the origin of the detection signal indicating corrective action.