Desempenho a pasto de novilhos mestiços de origem leiteira suplementados com níveis energéticos
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Data
2010-02-26
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Universidade Federal de Goiás
Resumo
The objective of this trial was to evaluate the productive and economic performance
of dairy crossbred steers, reared on Brachiaria Brizantha pasture that received two
levels of energetic supplementation during wet/dry transition and four levels during
dry/wet transition seasons. During the wet season, forty-eight milk crossbred steers
(Holstein x Zebu), with initial average weight of 123 kg and average age of 10 months
were used. The treatments consisted of two levels of energy supplementation, 1% of
BW, considered high, and 0.5% of BW, considered medium. During dry season, fortyfour
fourteen-month-old milk crossbred steers (Holstein x Zebu) were used. The
treatments consisted of two high levels of concentrate (1.6% and 1% of BW) and two
medium levels of concentrate (0.8% and 0.5% of BW). The supplementation was
composed of ground corn and mineral mixture, with urea addition during dry season.
A completely randomized experimental design was used. The means were compared
by F test at 5% probability in the first experiment and by Tukey test in the second
one. The data were analyzed by SAS (1997). The average daily weight gain and final
weight were similar between treatments in wet/dry transition. The thoracic
measurement indicates a good ponderal development. Energetic supplementation of
crossbred milk steers was economically viable, and the medium level (0.5% of BW)
presented higher profitability than the high level (1% of BW). In dry season, the
energy supplementation improved daily weight gain and the body measures of
growing milk crossbred steers reared on pasture. Body length and scrotal perimeter
indicated better body development. Milk crossbred steers supplemented on pasture
with energy levels ranging from 0.5 to 1.6% should be commercialized for the price of
live animal. And, in this case, the lowest level of supplementation (0.5% of BW)
should be used for better profitability.
Descrição
Palavras-chave
Bovino de leite , Confinamento (animais) , Mestiços , Pasto , Peso , Nutrição , Weight , Pasture , Crossbreeding
Citação
ALVES, Verônica Auxiliadora. Desempenho a pasto de novilhos mestiços de origem leiteira suplementados com níveis energéticos. 2010. 72 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2010.