de F. Carvalho, P. C.

de M. Gomes, M. J. T.

Fischer, V.

Montano, D. B.

Pegorar, E. J.

Poli, Cesar H. E. C.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Impact of Italian Ryegrass (Lolium multiflorum Lam.) Management on the Parasite Burden in Sheep Cesar H. E. C. Poli Federal University of Rio Grande do Sul, Brazil E. J. Pegorar Federal University of Rio Grande do Sul, Brazil P. C. de F. Carvalho Federal University of Rio Grande do Sul, Brazil M. J. T. de M. Gomes Federal University of Rio Grande do Sul, Brazil V. Fischer Federal University of Rio Grande do Sul, Brazil See next page for additional authors Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/9-2/2 The 21st International Grassland Congress / 8th International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. Presenter Information Cesar H. E. C. Poli, E. J. Pegorar, P. C. de F. Carvalho, M. J. T. de M. Gomes, V. Fischer, and D. B. Montano This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/9-2/2 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]69　 瞯Grasslands/Rangelands Production Systems——— Livestock Production SystemsImpact of Italian ryegrass ( Lolium multi f lorum Lam .) management on the parasite burden insheepC .H .E .C .Poli1 ,E .J .Pegorar O2 ,P .C .de F .Carvalho1 ,M . .J .T .de M .Gomes1 ,V .Fischer1 ,D .B .Montano21 Lecturer o f Federal University o f Rio G rande do Sul E‐mail : cesar .poli＠ u f rgs .br2 Post‐graduate o f Federal University o f Rio G rande do Sul .Key words : helminthosis ,Haemonchus contortus ,ewe ,stocking rate ,grazing methodIntroduction Gastrointestinal parasite is one of the main problems of sheep production in Brazil .It is still not clear how thepasture management affect the parasite burden in sheep .The objective of this work was to assess the risks of gastrointestinalnematode infections in sheep kept in different pasture allowances and grazing methods .Material and methods The experiment was carried out at Experimental Station of UFRGS ,Eldorado do Sul ,Rio Grande do SulState of Brazil ( ５１°３９′O ,３０°０５′S ) .The treatments were set out in a randomized block design with two factors and fourreplications .The two factors were : two stocking rates ( the stocking rate varied according to the potential of animal intake .Itwas offered ２ ,５ and ５ ,０ times the potential of animal intake) and two grazing methods ( SS‐set stock and R‐rotational) on anItalian ryegrass pasture .The pasture was assessed from August to October ２００６ .It was analyzed the number of parasite eggs indifferent strata of the canopy ( height in relation to the soil) : above １５ cm ,１０‐１５ cm ,５‐１０ cm ,２ .５‐５ cm ,０‐２ ,５ cm and litter .The animal contamination was assessed by the number of parasite eggs per gram of feces ( epg ) and faecal culture .It was alsomarked tillers to verify where the animals were grazing . The number of larvae in the pasture was quantified accordingmethodology of TAYLOR (１９３９) .Results The largest number of parasite larvae identified in the pasture samples was of Haemonchus contortus .The grazingmethod did not have a significant effect on the number of parasite larvae in the pasture and in the animals .The animalssubmitted to lower stocking rate and higher pasture mass were significantly more infected .There was greater recovery ofparasite larvae ( p ＜ .０００１) in the lower pasture strata (０‐２ ,５ cm ,２ .５‐５ ,０ cm and litter) than in the higher strata (１０‐１５ cmand above １５ cm ) ,though the animals grazed mainly the highest strata ( figure １ ) .This experiment demonstrates the greatimportance of the environment conditions for haemonchus survival .Haemonchus has the benefit of greater humidity ( TEMBELYet al . ,１９９７) in higher pasture mass ,though the position of the larvae in the predominant strata do not coincide with the mostselected strata .The use of low stocking rate do not show to be an important management tool to reduce sheep contamination .Figure 1 Means o f number in f ective larv ae in the pasture and percentage o f marked tillers grazed in di f f erent strata o fI talian ryegrass canopy ( ％ grazed) f or each treatment : graz ing method (SS‐set stock and R‐rotational graz ing) andstocking rate (２ ,５ n and ５ ,０ times the potential o f animal intake) .Conclusions Sheep select the highest strata of Italian ryegrass sward canopy in different grazing methods and stocking rates .Theamount of pasture mass has an important effect on sheep parasite contamination in the winter‐spring condition of the southernpart of Brazil .Higher mass provided higher sheep contamination with Haemonchus contortus .The grazing methods ,set stock orrotational grazing ,does not affect the sheep gastrointestinal parasite contamination .ReferencesTAYLOR ,E .L .Technique for the estimation of pastures infestation by strongly larvae .Parasitology ,v .３１ ,p .４７３‐４７８ ,１９３９ .TEMBELY S . ; LAHLOU‐KASSI A . ; REGE ,J .E .O . ; SOVANI ,S . ; DIEDHIOU ,M .L . ; BAKER ,R .L .The epidemiologyof nematode infections in sheep in a cool tropical environment .Veterinary Parasitology ,v .７０ ,p .１２９‐１４１ ,１９９７ .

Impact of Italian Ryegrass (\u3cem\u3eLolium multiflorum\u3c/em\u3e Lam.) Management on the Parasite Burden in Sheep

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Impact of Italian Ryegrass (\u3cem\u3eLolium multiflorum\u3c/em\u3e Lam.) Management on the Parasite Burden in Sheep

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