Characterization of grass and extrusa from Girolanda heifers grazing on Brachiaria decumbens pasture, under different stocking rates/Caracterizacao do pasto e da extrusa de novilhas Girolanda, em pastagem de Brachiaria decumbens, submetidas a diferentes taxas de lotacao

The objective of this study was to evaluate the characteristics of the grass and extrusa from Girolanda heifers, under three stocking rates on grass pasture of Brachiaria decumbens Stapf., at different evaluation periods. Six Girolanda heifers were used, and treatments consisted of different stockin...

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Veröffentlicht in:Acta scientiarum. Animal sciences 2011-04, Vol.33 (2), p.115
Hauptverfasser: da Silva, Andrezza Miguel, Modesto, Elisa Cristina, Lira, Carolina Camara, dos Santos, Mercia Virginia Ferreira, Brasil, Lucia Helena de Albuquerque, Dubeux, Jr., Jose Carlos Batista
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Zusammenfassung:The objective of this study was to evaluate the characteristics of the grass and extrusa from Girolanda heifers, under three stocking rates on grass pasture of Brachiaria decumbens Stapf., at different evaluation periods. Six Girolanda heifers were used, and treatments consisted of different stocking rates (2, 4 and 6 UA). Each block was formed by three paddocks. The design was a randomized blocks design in split-plot with repeated measures over time. The bite rate of the animals varied according to assessment period, with values of 41 bites [min.sup.-1] (Period 1) and 33 bites [min.sup.-1] (Period 3). Bite rate decreased over the grazing period, with values from 41 to 33 bit [min.sup.-1]. Bite size was larger in grazing periods 2 and 3, at the stocking rate of 2 UA (0.40 and 0.43 g DM [bite.sup.-1]). Extrusa dry matter was higher in the third (15.0% DM) and second (17.4% DM) days of grazing. An increase in crude protein content of extusa occurred in the third grazing period (14.4%) and for total neutral detergent fiber (75.3%). Keywords: bite, stem, leaf, senescent material. O objetivo deste trabalho foi avaliar as caracteristicas do pasto e da extrusa de novilhas Girolanda, submetidas a tres taxas de lotacao, em pastagem de capim Brachiaria decumbens Stapf., em diferentes periodos de avaliacao. Foram utilizadas seis novilhas da raca Girolanda e os tratamentos foram constituidos por diferentes taxas de lotacao (2, 4 e 6 UA); cada bloco foi formado por tres piquetes. O delineamento foi de blocos ao acaso em parcelas subdivididas com medidas repetidas no tempo. A taxa de bocados dos animais variou com o periodo de avaliacao, com valores de 41 bocados [min..sup.-1] (Periodo 1) e 33 bocados [min..sup.-1] (Periodo 3). A taxa de bocados reduziu ao longo dos periodos de pastejo com valores de 41 a 33 bocados [min..sup.-1] Ja o tamanho do bocado apresentou valores maiores nos periodos de avaliacao 2 e 3, na taxa de lotacao 2 UA (0,40 e 0,43 g MS [bocado.sup.-1]). A materia seca da extrusa apresentou valores maiores no 3° (15,0% de MS) e 2° (17,4% de MS) dia de pastejo. O aumento no teor de proteina bruta da extrusa ocorreu no terceiro periodo de pastejo (14,4%) e no teor de fibra em detergente neutro (75,3%). Palavras-chave: bocado, colmo, folha, material senescente.
ISSN:1806-2636
DOI:10.4025/actascianimsci.v33i2.9379