milk yield and composition, feed intake and stocking rate of crossbread cows in tropical grasses managed in a rotational grazing system produção e composição do leite, consumo de matéria seca e taxa de lotação em pastagens de gramíneas tropicais manejadas sob lotação rotacionada

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ID: 165378
2010
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Abstract
The objective of this study was to evaluate milk yield and composition, dry matter intake, and stocking rate in pastures with tanzania grass (Panicum maximum cv. Tanzânia), star grass (Cynodon nlemfuensis cv. Estrela-Africana), and marandu grass (Brachiaria brizantha cv. Marandu). The grasses were managed in a rotational grazing system with Holstein x Zebu crossbreed cows, with a 30-day resting period and three days of paddock occupation. The pastures were fertilized with 1,000 kg/ha/year using the 20:05:20 (NPK) formula, split in three applications during the rainy season. It was used a complete random block experimental design with three factors being studied and two replications. In the experiment, four cows/paddock were used and, when it was necessary, regulator animals were added in order to obtain a supply of 7% body weight green forage dry matter. The animals were individually fed concentrate at 2 kg/day during the experimental period. Milk yield did not differ among the three grasses, with values of 9.1; 9.1; and 8.7 kg/cow/day for pastures with tanzania grass, star grass and marandu grass, respectively. Similarly, grass did not affect milk chemical composition. Stocking rate was similar among the three grasses, with values of 4.6; 4.5 and 5.0 UA/ha for tanzania grass, star grass and marandu grass, respectively. The highest dry matter intake was observed for tanzania grass with 2.6% of the body weight while stargrass (2.3%) and marandu grass (2.4%) did not differ among each other. The highest dry matter intake on tanzania grass pasture was not reflected on milk yield per animal. Milk yield and composition and stocking rate are similar among the evaluated grasses.
Objetivou-se com este trabalho avaliar a produção e composição química do leite, o consumo de matéria seca e a taxa de lotação em pastagens de capim-tanzânia (Panicum maximum Jacq. cv. Tanzânia), grama-estrela (Cynodon nlemfuensis Vanderyst cv. Estrela-Africana) e capim-marandu (Brachiaria brizantha Stapf cv. Marandu). As gramíneas foram manejadas sob regime de lotação rotacionada com vacas mestiças Holandês x Zebu, com 30 dias de intervalo de desfolha e três dias de ocupação do piquete e foram adubadas com 1.000 kg/ha/ano da fórmula 20:05:20 (NPK), parcelada em três vezes durante a época das chuvas. O delineamento experimental foi em blocos ao acaso com três fatores em estudo e duas repetições. Foram utilizadas quatro vacas por piquete e, quando necessário, foram acrescentados animais reguladores objetivando obter oferta de massa seca de forragem verde de 7% do peso vivo. Os animais receberam individualmente 2 kg/dia de concentrado no período experimental. A produção de leite não diferiu entre as três gramíneas, com valores de 9,1; 9,1 e 8,7 kg/vaca/dia para as pastagens de capim-tanzânia, grama-estrela e capim-marandu, respectivamente. Da mesma forma, não houve efeito da gramínea na composição química do leite. A taxa de lotação foi semelhante entre as três gramíneas, com os valores de 4,6; 4,5 e 5,0 UA/ha para o capim-tanzânia, a grama-estrela e o capim-marandu. Maior consumo de matéria seca foi observado no capim-tanzânia com 2,6% do PV, enquanto a grama-estrela (2,3%) e o capim-marandu (2,4%) não diferiram entre si. O maior consumo de matéria seca na pastagem de capim-tanzânia não refletiu na produção de leite por animal. A produção e composição química do leite e a taxa de lotação sao similares entre as gramíneas avaliadas.
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fukumoto2010revistamilk Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Nelson Massaru Fukumoto, Julio Cesar Damasceno, Fermino Deresz, Carlos Eugênio Martins, Antônio Carlos Cóser, Geraldo Tadeu dos Santos
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Journal european journal of lipid science and technology
Year 2010
DOI
10.1590/S1516-35982010000700022
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982010000700022
Keywords
panicum maximum

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