The Control of Nematode Parasites of Sheep Grazing on Irrigated Pastures in the Southern Cape Province PDF Download
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Author: J. P. Louw
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: J. P. Louw
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Susan Marie Matlock
Publisher:
ISBN:
Category : Sheep
Languages : en
Pages : 226
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Book Description
The epidemiology of nematode infections in ewes and lambs on irrigated pastures was investigated during one reproductive cycle in a commercial operation in Central Oregon. Primary objectives were to determine the sources of parasitism, the effect on lamb weight gains, and the effectiveness of control procedures in minimizing the detrimental effects of parasitism. Methodology included fecal nematode egg counts, animal necropsies and the use of tracer lambs. The relationships between blood trace mineral levels, parasitism and suboptimal weight gain in lambs and calves were also examined. High pasture burdens of infective larvae were found in spring and early summer from overwintering larvae and in late summer from autoinfestation by ewes and lambs. Lamb weight gain from March until mid-July was 0.48 lb/head/day. From mid-July until September when the study terminated, lamb weight gain declined ( -0.03 to 0.28 lb/head/day). Parasite burdens were low to moderate early in the grazing period, but increased markedly during the mid-July to September period, despite monthly deworming of the flock. It appeared that parasite burdens, high summer temperatures and the lack of shade, and possibly low cobalt and selenium levels were responsible for the late summer decline in weight gain. Evaluation of control measures indicated that intensive deworming prior to parturition eliminated arrested or inhibited larvae in the ewes. The periparturient relaxation of resistance, however, permitted development of infective larvae acquired from the pre- and post-lambing pastures. Maturation of these larvae caused a marked rise in post-parturient egg per gram counts of the ewes with subsequent relatively high rates of pasture contamination. Monthly deworming of the flock was moderately effective in reducing parasite burdens and pasture contamination. Alternate grazing of pastures by cattle and sheep, and ad lib. feeding of phenothiazine in salt were not effective as control measures.
Author: South African Veterinary Association
Publisher:
ISBN:
Category : Veterinary medicine
Languages : en
Pages : 206
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Author: T.N.P. Charles
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Review of literature. Materials and methods: animal management; experimental design, parasitologic methods, climatologic data. Results: cattle, sheep. Discussion: cattle, sheep. Conclusions and recomendations.
Author: Ian Scott
Publisher: John Wiley & Sons
ISBN: 1405185821
Category : Medical
Languages : en
Pages : 256
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A unique resource for all those interested in the impact of worms on livestock, the anthelmintics used to get rid of them and the emerging problem of anthelmintic resistance. This book provides an over-arching view of past, present and suggested future strategies for control of gastrointestinal nematode parasites in sheep and cattle. The book begins with descriptions of the biology of gastrointestinal nematodes, the harm they cause to the host and their economic impact. The main body of the book deals with the control of worms, focusing on the use of anthelmintic drenches. The relationship between drenching practices and the development of drug resistance is discussed, as well as resistance management. The authors also break new ground by discussing alternative options for worm control, including: nutritional interventions, biological control, breeding for desirable genetics and artificially improving immunity to infection. They also offer useful recommendations for program development.
Author: Harry Draper Crofton
Publisher:
ISBN:
Category : Domestic animals
Languages : en
Pages : 412
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Parasite populations within the host animals. Populations on pastures. Life history and populations. Theoretical consideration of control measures.
Author: A. D. Donald
Publisher:
ISBN:
Category : Medical
Languages : en
Pages : 180
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Author:
Publisher:
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Category : Agriculture
Languages : en
Pages : 944
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Author: E. R. Doll
Publisher:
ISBN:
Category : Agriculture
Languages : en
Pages : 4
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Author: William Phillip Shulaw
Publisher:
ISBN:
Category : Sheep
Languages : en
Pages : 12
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