Epidemiology of Gastrointestinal Nematode Parasites of Cattle and Sheep Grazing Irrigated Pastures in the Sacramento Valley, California, USA. PDF Download
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Author: T.N.P. Charles
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
Review of literature. Materials and methods: animal management; experimental design, parasitologic methods, climatologic data. Results: cattle, sheep. Discussion: cattle, sheep. Conclusions and recomendations.
Author: T.N.P. Charles
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
Review of literature. Materials and methods: animal management; experimental design, parasitologic methods, climatologic data. Results: cattle, sheep. Discussion: cattle, sheep. Conclusions and recomendations.
Author: Terezinha N. Padilha-Charles
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Book Description
Bovino; Nematoide; Gastrintestinal; Epidemiologia; Ovino; Estados Unidos; California; Sanidade; Doenca; Parasitaria; Manejo.
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: Ian Scott
Publisher: John Wiley & Sons
ISBN: 1405185821
Category : Medical
Languages : en
Pages : 256
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Book Description
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:
Publisher:
ISBN:
Category : Veterinary parasitology
Languages : en
Pages : 354
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 118
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Book Description
Strategic nematode parasite control programs in grazing cattle basead on epidemiological information. Epidemiology of trichostrongyle infection in grazing cattle of the humid Pampa (Argentina) with special reference to Ostertagia ostertagi. Epidemiology of nematode parasitism in young cattle in the Northeastern region of Argentina (Santa Fe Province). Epidemiology of bovine nematode parasites in the Eastern Plains of Colombia. Epidemiology of helminths in nellore beef cattle in the Cerrados of Brazil. Epidemiology of bovine nematode parasites in Southeastern Brasil. Epidemiology study of parasites in young weaned beef cattle in the temperate zone of Brazil. Epidemiolgy of bovine nematode parasites in warm temperate regions of the United States. Epidemiology of bovine nematode parasites in NOrthers United States. Epidemiology of bovine nematode parasites in Eastern Canada. Epidemiology of gastrointestinal nematodes in a Cow/Calf herd in central Alberta. The use of computer models in the design of strategic parasite control progams.
Author: A. D. Donald
Publisher:
ISBN:
Category : Medical
Languages : en
Pages : 180
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 118
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Book Description
Strategic nematode parasite control programs in grazing cattle basead on epidemiological information; Epidemiology of trichostrongyle infection in grazing cattle of the humid Pampa (Argentina) with special reference to Ostertagia ostertagi; Epidemiology of nematode parasitism in young cattle in the Northeastern region of Argentina (Santa Fe Province); Epidemiology of bovine nematode parasites in the Eastern Plains of Colombia; Epidemiology of helminths in nellore beef cattle in the Cerrados of Brazil; Epidemiology of bovine nematode parasites in Southeastern Brasil; Epidemiology study of parasites in young weaned beef cattle in the temperate zone of Brazil; Epidemiolgy of bovine nematode parasites in warm temperate regions of the United States; Epidemiology of bovine nematode parasites in NOrthers United States; Epidemiology of bovine nematode parasites in Eastern Canada; Epidemiology of gastrointestinal nematodes in a Cow/Calf herd in central Alberta; The use of computer models in the design of strategic parasite control progams.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 788
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Book Description
Author: Saidou Tembely
Publisher:
ISBN:
Category : Helminths
Languages : en
Pages : 170
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Book Description
ABSTRACT: An experiment was conducted at the Texas Range field station at Barnhart, to investigate the effects of different grazing systems on transmission of gastrointestinal nematodes of sheep. Groups of three 30-40 kg Rambouillet lambs raised in parasite-free condition were grazed with sheep and cattle during various periods of the year on switchback, Merrill 4-pasture, intensive and continuous grazing systems. The effects of these treatments on the transmission of free-living larvae from pastures to lambs were assessed by worm counts of lambs which grazed the paddocks. The results were analyzed by Duncan's multiple range test after logarithmic transformation. There was little effect of any treatment on numbers of Haemonchus contortus or Trichostrongylus axei, and except for the intensive system and Nematodirus spp. There was no significant difference between the worm counts of the various groups after exposure, it was concluded that, in general, any grazing system might be utilized without special recommendations. Because intensive system did not increase the chance of greater transmission, it would be advantageous for greater pasture utilization. Precipitation was the principal environmental factor influencing larvae transmission. Hematological and serological studies gave values within the normal range although there was a slight inverse correlation between worm counts and packed cell voulme.
