Programa de Pós-graduação em Ciência Animal
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Navegando Programa de Pós-graduação em Ciência Animal por Autor "Alves, Verônica Auxiliadora"
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Item Estratégias nutricionais para novilhos mestiços de origem leiteira para produção de carne(Universidade Federal de Goiás, 2014-05-23) Alves, Verônica Auxiliadora; Padua, João Teodoro; http://lattes.cnpq.br/0308044304591375; Padua, Teodoro Padua; Silva, Rodrigo Medeiros da; Oliveira Júnior, Reinaldo Cunha de; Fernandes, Juliano José de Resende; Lima, Milton Luiz MoreiraThe objective of this study was to evaluate strategies for the use of these animals for meat production. The influence of concentrate levels in the finishing diet on the productive performance and the carcass characteristics of crossbred dairy cattle, growing on pasture with two levels of energetic supplementation was evaluated. 39 non-castrated, crossbred dairy steers were used. The behavior of these animals during the confinement was also evaluated. The growing was conducted on Brachiaria brizantha cv. Marandu under two supplementation strategies based on milled corn grain and mineral supplement until the dry season of the year. The animals showed at the beginning of the trial confinement, age and average body weight of 23 months and 417.7 ± 5.7 kg, respectively. The treatments were randomized amongst the animals: 0.7% supplementation in growing and 60 % of concentrate in the confinement diet; 0.7% supplementation in growing and 90 % of concentrate in the confinement diet; 1.2% supplementation in growing and 60 % of concentrate in the confinement diet; and 1.2% supplementation in growing and 90 % of concentrate in the confinement diet. Statistical analyzes were conducted according to a completely randomized design with a 2x2 factorial arrangement through the computer program SAS (1997). Supplementation with 1.2% of body weight during growth results in a higher initial weight at the beginning of the confinement and improves the quantitative carcass characteristics of crossbred dairy steers. The supplementation with 0.7% of body weight may result in compensatory gains during finishing, resulting in increased average daily gain of crossbred dairy steers. Qualitative characteristics of meat from crossbred dairy steers are not influenced by levels of 60% or 90% of concentrate at finishing, when the slaughter weight is predetermined. Nutritional strategies do not influence the profile of longissimus dorsi fatty acids from crossbred dairy steers finished in confinement. The inclusion of higher levels of concentrate in the diet decreases the time that animals intend for food consumption and ruminating and increases the resting time. These alterations in the ingestive behavior, however, are not sufficient to interfere in the food consumption.Item Desempenho a pasto de novilhos mestiços de origem leiteira suplementados com níveis energéticos(Universidade Federal de Goiás, 2010-02-26) Alves, Verônica Auxiliadora; Padua, João Teodoro; http://lattes.cnpq.br/0308044304591375The 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.