da Silva Ávila, Carla Luiza

de Cássia Ribeiro Carvalho, Rita

de Faria, Emar Gustavo

Hübner Braga Nunes, Ayeska

Pinto, José C.

Rocha, Wellington W.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Performance of Crossbred Nelore Steers on Non‐Irrigated and Irrigated Brachiaria brizantha cv MG5 in Rotational Grazing System Rita de Cássia Ribeiro Carvalho Universidade Federal de Lavras, Brazil José C. Pinto Universidade Federal de Lavras, Brazil Wellington W. Rocha Fundação de Ensino Superior de Passos, Brazil Ayeska Hübner Braga Nunes Fundação de Ensino Superior de Passos, Brazil Emar Gustavo de Faria Fundação de Ensino Superior de Passos, 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/21/9-1/21 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 Rita de Cássia Ribeiro Carvalho, José C. Pinto, Wellington W. Rocha, Ayeska Hübner Braga Nunes, Emar Gustavo de Faria, and Carla Luiza da Silva Ávila This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/9-1/21 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　 瞯 ]37　 瞯Grasslands/Rangelands Production Systems——— Livestock Production SystemsPerformance of crossbred Nelore steers on non‐irrigated and irrigated Brachiaria brizantha cvMG 5 in rotational grazing systemRita de Cássia Ribeiro Carvalho1 ,2 ,José Cardoso Pinto1 ,Wellington W illian Rocha2 ,A yeska Hübner Braga Nunes2 ; EmarGustavo de Faria2 ,Carla Luiz a da Silv a áv ila11 Universidade Federal de L av ras (UFLA ) and 2 Funda毕本o de Ensino Superior de Passos ( FESP) ,M inas Gerais ,B raz ilE‐mail : ritarcarv alho＠ uol .com .brKey words : dry matter yield ,weight gain ,irrigation forageIntroduction Brazil presents an enormous potential for cattle production on pasture . However ,water is one of the maindeterminative factors of the grow th of crops ; the irregularities of rainfall regime during the year are restrictive to theagricultural development of tropical countries such as Brazil .Thus ,the irrigation has been one of the techniques most widelyused in agriculture to obtain high yield ( Drumond & Fernandes ,２００１ ) .It was aimed ,through this work ; to evaluate the drymatter yield (DMY) of Brachiaria briz antha cv .MG５ and the weight gain of the animals under conditions of irrigated and non‐irrigated pastures .Materials and methods The study was carried out on the Experimental Farm of the Higher Learning Institution of Passos ,Agricultural College ,situated in the southwestern region of Minas Gerais ,Brazil .The town of Passos presents １７０９ .４ of annualaverage rainfall and average temperature above １８ ℃ ,w ith a maximum of ３８ ℃ ,and a well defined dry season from April toSeptember .The experiment consisted of the evaluation of B .brizantha cv .MG ５ grown in an area of ５ ha ,２ .５ ha being irrigatedand the other ２ .５ ha non‐irrigated ,divided in ３２ enclosures .The rotation of the enclosures occurred every two days occupationand ３０ days rest ,amounting to a grazing cycle of ３２ days .The nitrogen fertilization was of １００ kg .ha‐１ of nitrogen ( N ) .A restarea was destined for the animals ,with mineral salt and water at libitum .The animals were weighed in each grazing cycle andthe forage plant was harvested before and after grazing .The study of August of ２００６ encompassed the period of March of ２００６ ,amounting to a total of six grazing cycles .Results For DMY ,evaluating irrigation in each cycle ,differences among the irrigation levels were found ,with the highest DMYvalues for the non‐irrigated condition in cycles １ to ４ .Possibly ,this occurred owing to a forest fire occurred in the area of thistreatment ,which can have caused a greater nutrient availability .Moreover ,in the area of the irrigated treatment ,remainingplants parts from the previous pasture were incorporated with harrowing ,which can have also resulted into the temporary Nnon‐availability .When the cycle in each irrigation level was evaluated ,there was a significant increase ( p ＜ ０ .０５ ) of cycle １ to４ .In cycles ５ and ６ ,there were no differences among irrigation levels .As regards the animals weigh gain ,till the ４th grazingcycle ,there were no differences among irrigation levels ,which can be accounted for by the highest rainfall in this period .Incycles ５ and ６ ,when rainfall was low ,animals from the irrigated pasture gained more weight .When the cycles in each irrigationlevel were compared ,statistical differences were detected only in the irrigated plot ,both cycles ５ and ６ outyielded in excess .Table 1 Dry matter y ield ( DMY ) o f Brachiaria briz antha cv .MG ５ and weight gain o f animals submitted to the rotationsystem under two irrigation levels in six graz ing cycles .DMY ( kg / ha)Cycle １ いCycle ２  Cycle ３ oCycle ４ 栽Cycle ５ :Cycle ６ 煙MeanIrrigated ４７８０abcB ４８８０abB ５７５７aB ４１７０bcB ３４５５cA ３８１７bcA ４４７７BNon‐irrigated ８４３６aA ６５６４bA ８３３９aA ５５９１bA ３２１１cA ４１６８bcA ６０５１AMean ６６０８ab ５７２２bc ７０４８a ４８８０cd ３３３３e ３９９３deWeight gain ( kg / animal/ day)Irrigated ０ ,２８bA ０  .３２bA ０ v.４０bA ０ 苘.２８bA １ E.０１aA １ *.４９aA ０ B.４３ANon‐irrigated ０ �.３８aA ０  .３５aA ０ z.３２aA ０ 哌.１６aA ０ L.３４aB ０ 北.２８aB ０ B.５０AMean ０ 佑.３２c ０ 8.３３c ０ 灋.３６c ０  .２２c ０ d.６７b ０ 屯.８９aMeans followed by the small letter in the row and capital letter in the column do not differ statistically by Tukey test ( P ＞ ０ .０５) .Conclusions The total dry matter yield was higher in the non‐irrigated treatment .The first four grazing was the one whichpresented the highest dry mater yield .The animals weight gain did not differ between the irrigated and non‐irrigated condition ,however ,in the ６ grazing cycles ,both cycle ５ and irrigation provided the highest gain .ReferenceDRUMOND ,L .C .D . ,FERNANDES ,A .L . T . Irriga毕本o por aspers本o em malha .Uberaba :MG ,Editora Universidade deUberaba , ２００１ ,８４p .

Performance of Crossbred Nelore Steers on Non‐Irrigated and Irrigated \u3cem\u3eBrachiaria brizantha\u3c/em\u3e cv MG5 in Rotational Grazing System

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=3002&amp;context=igc

Performance of Crossbred Nelore Steers on Non‐Irrigated and Irrigated \u3cem\u3eBrachiaria brizantha\u3c/em\u3e cv MG5 in Rotational Grazing System

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