Euclides, Valéria P. B.

Filho, Kepler Euclides

Paim Costa, Fernando

Scaff Raffia, Alexandre

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress The Use of Concentrate Supplements to Overcome Seasonal Shortages of Grazed Herbage in Beef Production Systems Valéria P. B. Euclides EMBRAPA, Brazil Kepler Euclides Filho EMBRAPA, Brazil Fernando Paim Costa EMBRAPA, Brazil Alexandre Scaff Raffia EMBRAPA, Brazil 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/21/9-2/13 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. 瞯 ]80　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　Grasslands/Rangelands Production Systems——— Livestock Production SystemsThe use of concentrate supplements to overcome seasonal shortages of grazed herbage in beefproduction systemsValéria Pacheco Batista Euclides ,K ep ler Euclides Filho ,Fernando Paim Costa ,A lexandre Scaf f Raf f iaEmbrapa Gado de Corte ,Rodov ia Br 262 ,km 04 ,Caixa Postal 154 ,CEP 79002‐970 ,Campo Grande ,MS ,Braz il .E‐mail : v al＠ cnp gc .embrapa .brKey words :Brachiaria brizantha ,forage allowance ,savanna , nutritive valueIntroduction The Brazilian average slaughter age is presently close to ４０ months of age .There is a major national initiative todecrease the slaughter age ,and to improve production systems with greater efficiency ,with good quality and low price .However ,the seasonality of forage production and quality of tropical pastures is the major limitation to reduce slaughter age ofthe animals .Moreover ,slaughter age has an important role in meat quality ,since young cattle tend to produce tenderer meat .Thus ,the objective was work to evaluate the efficiency of feed supplementation of steers grazing palisadegrass ( Brachiariabriz antha) pasture ,during the dry season .Table 1 Forage dry matter av ailable (DM ) ,allow ance per day ( FA D ; kg o f DM / 100 kg o f LW .day ) ; leaf blade ( LB )and stem ( S) percentages ,and percentages o f lea f ,crude p rotein (CP) ,in vitro organic matter digestibility ( IVOMD) andneutral detergent f iber ( NDF) .June July August SeptemberDM ( kg / ha) ３ ,５６０a ３ ,１２０a ２ ,６９０b ２ ,６００bFAD ８  .１a ６ n.６b ６ 圹.０b ６ ".９bLB( ％ ) ３３  .２a ２４ 厖.７b １２ ,７c ５ #.１dS ( ％ ) ２６  .５a ２９ 墘.８a ２２ ,８b １７ >.２cCP ( ％ ) ５  .８a ４ n.３b ３ ,７bc ３ '.１cIVOMD ( ％ ) ４５  .２a ４０ 厖.５b ４０ ,１c ３４ >.３cFDN ７７  .７c ７９ 厖.６b ７９ ,１b ８１ =.７aMeans followed by the same letter in row are not different ( P ＜ ０ .０５ ) ,by Tukey .Materials and Methods The experiment was carried out at the National Beef Cattle Research Center ,Campo Grande ,Brazil .Sixpaddocks (１ .５ ha each) of palisadegrass were deferred in March and grazed from June to October .Thirty steers approximately１８ months of age ,with an average initial body weight of ３８０ kg were randomly assigned to each paddock ,under the followingtreatments : a) １２０ g of mineral salt plus starea (２３％ CP) ; b) supplementation at ０ .６％ of LW ; and c) supplementation at １％of LW .The supplement contained ; ３２ .５％ soybean meal ,３２ .２％ corn ,２９ .８％ soybean seed ,３ .５％ mineral mixture and ２％calcium carbonate .Forage samples were taken at ２８‐day intervals .The animals were weighted each ２８ days and checked withrespect to the end point ( minimal ３mm of fat cover ) .Data was analyzed according to REG‐SAS and GLM‐SAS .Economicanalysis was also performed .Results Throughout the dry season ,all pastures presented similar ( p ＞ ０ .０５ ) availability of forage ,pasture structure andnutritive value ,assuring that the increase in average daily gains ( ADG ) were a result of the supplementation .Despite thedecrease in forage allowance and nutritive value throughout the dry season ( Table １ ) ,there was a linear ( p ＜ ０ .０１ ) increase inADG as the level of feed supplementation increased ( ADG ＝ ４２０ ＋ ６１０x ; R２ ＝ ０ .８１) ,where x is equal level of supplementation .Consequently there was an inverse relationship between supplementation level and time for reaching the predefined end point ,being in average ２１ ,２４ and ２６ months of age ,respectively for animals supplemented with １％ LW ,６％ LW and salt‐starea .Thesalt‐starea resulted in the biggest operational margin ( total revenue minus operational costs) .The second best result was from the treatment where supplement was provided as ０ ,６％ of the live weight .The one whichsupplement level was １ ,０％ of the live weight showed the worst economic performance .Conclusion It was possible to decrease steer slaughter age combining pasture deferred with feed supplementation .Even thougheconomic results were not the most attractive ,the feed supplementation using concentrate at a level of １％ LW might have somestrategic use for attending specific markets or for providing pastures to be used for other animals ,since the steers are ready toslaughter at the beginning of dry season .

The Use of Concentrate Supplements to Overcome Seasonal Shortages of Grazed Herbage in Beef Production Systems

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The Use of Concentrate Supplements to Overcome Seasonal Shortages of Grazed Herbage in Beef Production Systems

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