Freitas, A. K.

Genro, Teresa C. M.

Milano, L. R.

Oliveira, L.

Orqis, M. G.

Palma, T. S.

Varella, Alexandre C.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress Nutritive Value and Voluntary Intake of Beef Cattle Females in Pampa Biome, Southern Brazil Teresa C. M. Genro EMBRAPA, Brazil M. G. Orqis EMBRAPA, Brazil L. Oliveira Universidade Federal de Santa Maria, Brazil Alexandre C. Varella EMBRAPA, Brazil L. R. Milano EMBRAPA, 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/21/15-1/37 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. Presenter Information Teresa C. M. Genro, M. G. Orqis, L. Oliveira, Alexandre C. Varella, L. R. Milano, A. K. Freitas, and T. S. Palma This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/15-1/37 瞯 684　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　Grasslands/Rangelands Production Systems ——— Forage Quality ,Conservation and UtilizationNutritive value and voluntary intake of beef cattle females in Pampa Biome , southern BrazilT . C . M . Genro1 , M . Orqis1 , L . Oliveira 2 , A .C . Varella1 , L .R . Milano1 , A .K . Freitas3 , T .S . Palma11 The Braz ilian Agricultural Research Corporation ( EMBRAPA ) , EMBRAPA South Animal Husbandry & Sheep , BR153 , Km 595 , Po Box , 242 , Zip Code 96401‐970 , RS State , Brazil , E‐mail : cristina ＠ cp psul .embrapa .br2 UFSM , A venida Roraima , n° 1000 , Cidade Universitária , Bairro Camobi , 97105‐900 , Santa Maria — RS — Braz il3 UFRGS , Av . Bento Gon毕alves , 7712 Postal box 15 .100 , 91501‐970 , Porto A legre , RS — Braz ilKey words : average daily gain ,brangus ,crude protein ,dry matter intake ,IVOMD ,native grassland ,NDFIntroduction In the Brazilian State of Rio Grande do Sul , the Pampa Biome , is responsible for feeding about ９０ ％ of the cattleand sheep herds used for meat production . This is an area located where native pasture is composed of around ４００ grasses and１５０ legumes . Animal production is influence by the amount and quality of herbage intake , so voluntary herbage intake isconsidered the main limiting factor of productivity in grazing production systems ( Baumont et al . , ２００４ ) . A greater availableherbage may increase both quantity and quality of forage intake , since the opportunity of selected grazing is enhanced . The aimof this work was to evaluate the effects of herbage intake and nutritive value of native pastures on beef heifers grazing underdifferent feeding systems based on natural grasslands .Materials and methods This study aimed to evaluate the nutritive value of a natural grassland managed with three feedingsystems for beef cattle females : natural grassland submitted to previous resting period ( NG ) , natural grassland submitted toprevious resting period ＋ protein mineral salt supplement ( NGS) and natural grassland oversowed with annual Italian Ryegrass ,White Clover and Birdsfoot Trefoil ( ING) . To estimate the dry matter voluntary intake ( DMI) , chromium oxide was used asmarker of faecal production . Three Brangus breed heifers , by replicate , were dosed orally , during １２ days in two periods :August and October , ２００６ . Samples for nutritive value analysis were collected manually by hand‐plucking method and theywere analyzed for crude protein ( CP ) , neutral detergent fiber ( NDF) , in vitro" organic matter digestibility ( IVOMD) . Tomeasure average daily gain ( ADG) , the animals were weighed every ２８ days with １２ hours of fasting prior to each weighing .The experimental design was randomized block , with three replicates . Data was submitted to GLM Procedure and the meanseparation was conducted using the Tukey Test ( P ＜ ０ .０５ ) . The statistical software used was SAS version ８ .０２ (２００１ ) .Results All parameters , except DMI , showed differences among treatments ( P ＜ ０ .０５ ; Table １ ) . The best results wereobserved in ING feeding system which provided pasture with the largest differences in nutritive value and ADG ( P ＜ ０ .０１ ) : CP＝ ０ .７２ , IVOMD ＝ ０ .７６ and NDF ＝ ‐０ .６９ . As all feeding systems had the same herbage allowance , １２ kg of DM to １００ kg ofLW , inclusion of cultivated pasture species in ING treatment allowed the animals to have the highest nutritive value perkilogram of DM , resulting in ADG around ５０ ％ greater than the others feeding systems ( NGS and NG) . In addition , the DMIwas greater on August than on October ( P ＜ ０ .０５ ) . The DMI , however , were higher than those normally reported onreferences for this animal category .Table 1 DM intake ( ％ LW ) , neutral detergent f iber ( NDF , ％ ) , crude p rotein ( CP , ％ ) , in vitro" organic matterdigestibility ( I VOMD , ％ ) and average daily gain ( ADG , g .d‐１ ) o f a natural grasslandTreatment DMI ( ％ LW) NDF ( ％ ) CP ( ％ ) IVOMD ( ％ ) ADG ( g .d‐１ )ING ３ .９８ ５８ .０２ a 倡 ２０ .９３ a ６６ .６０ a ８８５ aNGS ３ .５３ ７３ .２８ b １６ .２３ b ５２ .１０ b ４０８ bNG ３ .３３ ７３ .５７ b １４ .９７ b ５３ .９６ b ４３４ bPeriod of the yearAugust ４ .３２ A ６４ .７７ A １６ .６４ ５９ .７８ ０ .６２７ AOctober ２ .９１ B ７１ .８１ B １８ .１２ ５５ .３２ ０ .５２４ BCoeff . of variation ( ％ ) １４ .５１ ５ .７７ ８ .６０ ６ .８６ １１ .８８倡 Averages followed by different capital or lower case letters in same columns are different ( P ＜ ０ .０５ )Conclusion The use of management techniques to improve the nutritive value of natural grasslands increases the animalperformance without affecting the DM intake .ReferenceBaumont , R ; Cohen‐Salmon , D . ; Prache , S . et al . ２００４ . A mechanistic model of intake and grazing behaviour in sheepintegrating sward architecture and animal decisions . Animal Feed Science and Technology , v .１１２ , p .５‐２８ .

Nutritive Value and Voluntary Intake of Beef Cattle Females in Pampa Biome, Southern Brazil

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Nutritive Value and Voluntary Intake of Beef Cattle Females in Pampa Biome, Southern Brazil

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