Dianati Tilaki, Ghasem Ali

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University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Effects of Animal Grazing on Quality of Grass and Forb Forages in Mazandaran Province of Iran Ghasem Ali Dianati Tilaki Tarbiat Modares University, Iran 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/21/10-2/23 The XXI International Grassland Congress / VIII 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. 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]261　 瞯Grasslands/Rangelands Production Systems——— Integration of Crops , Forage and Forest SystemsEffects of animal grazing on quality of grass and forb forages in Mazandaran province of IranGhasem A li Dianati T ilakiA ssistant p ro f essor o f Tarbiat Modares University , Faculty o f Natural Resources and Marine Sciences , Department o fRange Management , P .O .Box 46414‐356 , Noor‐I ran . ( dianatitilaki＠ yahoo .com)Abstract Effects of light ( ３ ha/cow / yr ) and moderate ( １ ha/cow / yr ) stocking rates on forage quality of . . . were evaluated .Crude protein of forbs were generally greater than for others species under both , moderate and light stocking . Moderatestocking during rapid plant grow th could positive affect on quality of available forage plants .Key words : crude protein , dry mater digestibility , stocking rate , forage qualityIntroduction Rangeland livestock productivity is influenced by the quality of forage consumed which , in turn , is a function of thequantity and quality of forage produced . Although climate is a major factor affecting forage quality in grasslands ( Lauenroth etal .１９９４) , the major factors within a given climatic regime are the inherent productivity potential of the site and the kinds andnumber of plants present ( i .e . , range condition) ( Bartolome et al .１９９２ ) . The objective of this study was to evaluate effects ofmoderate and light stocking rates on the nutritional quality of available forages in a northern rangeland of Iran .Materials and methods The study was conducted at the Chahardangeh Sari in a northern mixed‐grass prairie of Iran .Vegetationis composed of 爥 .Grazing treatments were year‐long , continuously stocked with cattle at light ( ３ ha/cow / yr ; LG ) andmoderate rates ( １ ha/cow / yr ; MG ) . These treatments were initiated in ２００４ and replicated twice in ４ pastures of similarconditions ( Heitschmidt et al . １９９１ ) . Crude protein ( CP) , dry mater digestibility ( DMD) and acide detergent fiber ( ADF)responses of four species of grasses and three species of forbs to stocking rates were evaluated . Mean separations wereaccomplished using Tukey�s procedure ( p ＜ ０ .０５) .Results Moderate stocking produced increases in CP and DMD for both , grasses and forbs , relative to light stocking . Forbsgenerally had greater forage quality than grasses in both stocking treatments ( Table １A‐１B) .Table 1 Comparison between f orage quality o f grasses (A ) and f orbs(B ) in di f f erent stocking rates .( A )CategoryT reatmentsLight grazing( LG) Moderate grazing( MG)CP ( ％ )DMD ( ％ )ADF ( ％ )７ �.２ ± ０ .４b４９ ± ０ .６b４６ .３ ± ０ .９b８ D.５ ± ０ .３a５３ .６ ± ０ .４a４４ .５ ± ０ .８a( B)CategoryT reatmentsLight grazing ( LG) Moderate grazing( MG)CP ( ％ )DMD ( ％ )ADF ( ％ )１０ 弿.２ ± １ .３b６２ .３ ± ３ .４b３１ .３ ± １ .４b１１ S.８ ± ０ .９a６８ .６ ± ２ .２a２９ .２ ± ０ .９aa ,b signi f icant di f f erence ( p ＜ 0 .05) .Discussion and conclusion Moderate stocking rate , during rapid plant grow th , can positive affect forage quality of dominantgrass and forb species on mixed‐grass prairie of northern Iran . In addition , grass species in this study generally had lowerforage quality than forb species which , is similar to findings from other parts of the world ( Norton １９８２ , Smith et al . １９８６ ,Holechek et al . ２００５) .ReferencesBartolome , J .W . , and M .P . McClaran ,１９９２ , Composition and production of California oak savanna seasonally grazed bysheep . J .Range Mgt .４５(１) :１０３‐１０７ .Heitschmidt , R .K . , and J .W . Stuth ( Eds ) . ( １９９１ ) �Grazing management : An ecological perspective" . Timber p ress ,Portland , OR .２５９pp .Laurenroth , W .K . , D .G . Milchunas . , J .L . Dodd . , R .H . Hart . , R .K . Heitschmidt . , and L .R .Rittenhouse . , １９９４ ,Effects of grazing on ecosystems on the great plains . In M .V arra , W .L aycock , and R .D .Pieper ( Eds ) , �Ecologicalimplications of livestock herbivory in the west" . Soc .Range Mgt . , Denver , Co .PP . ６９‐１００ .Smith . B . , Leung , P .S . , Love , G . , １９８６ , Intensive grazing management : forages , animals , Men , profits . The graz iers ,Honolulu , H aw aii , ３５０pp .Norton , B .W . , １９８２ , Differences between species in forage quality , Farnham Royal , UK , pp .８０‐１１０ .Holecheek , J . L . , Pieper , R .D . , Herbel , C . H . , ２００５ , Range management principles and practices . Prentice H all ,Englewood cli f f , pp .１７４‐２８３ .

Effects of Animal Grazing on Quality of Grass and Forb Forages in Mazandaran Province of Iran

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Effects of Animal Grazing on Quality of Grass and Forb Forages in Mazandaran Province of Iran

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