Navegando por Autor "Lanna, Dante Pazzanese Duarte"

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    Combined use of ionophore and virginiamycin for finishing Nellore steers fed high concentrate diets
    (2013) Nuñez, Amoracyr José Costa; Caetano, Mariana; Berndt, Alexandre; Demarchi, João José Assumpção de Abreu; Leme, Paulo Roberto; Lanna, Dante Pazzanese Duarte
    Zebu cattle fed high concentrate diets may present inconsistent performance due to the occurrence of metabolic disorders, like acidosis. The isolated use of ionophores and virginiamycin in high grain diets can improve animal performance and reduce the incidence of such disorders, but recent studies suggested that their combination may have an additive effect. Thus, 72 Nellore steers, 389 ± 15 kg initial body weight (BW), were confined and fed for 79 days to evaluate the combination of virginiamycin and salinomycin on performance and carcass traits. Animals were allocated to a randomized complete block design by BW, in a 2 × 2 factorial arrangement of treatments, with two concentrate levels (73 and 91 %) and two virginiamycin levels (0 and 15 mg kg-1), and salinomycin (13 mg kg-1) included in all diets. The interaction was not significant (p > 0.05). Dry matter intake (DMI), average daily gain (ADG), gain-to-feed ratio (G:F), starch consumed, and fecal starch content were higher (p < 0.05) for the 91 % concentrate treatment. These animals also had higher (p < 0.05) hot carcass weight and dressing percentage. Virginiamycin-treated animals showed lower DMI, but ADG and G:F did not differ (p > 0.05) between treatments. Starch consumed and estimated dietary net energy for maintenance (NEm) and gain (NEg) were higher (p < 0.05) for virginiamycin-treated animals, with no substantial effects on carcass traits. The inclusion of virginiamycin in finishing diets containing salinomycin reduced DMI while maintaining ADG and improving NEm and NEg, suggesting an additive effect of virginiamycin and ionophores, but without affecting carcass quality.
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    Desempenho e características da carcaça de tourinhos Santa Gertrudes confinados, recebendo dietas com alto concentrado e níveis crescentes de polpa cítrica peletizada
    (2004) Henrique, Wignez; Sampaio, Alexandre Amstalden Moraes; Leme, Paulo Roberto; Lanna, Dante Pazzanese Duarte; Alleoni, Guilherme Fernando; Coutinho Filho, José Luiz Viana
    The experiment was developed to evaluate the effect of the replacement of corn grain by dehydrated citrus pulp pellets on the performance and carcass characteristics of Santa Gertrudis young bulls fed high concentrate diets. Twenty-eight bulls, with average age of nine months and an initial weight of 277 kg, were kept in individual pens and fed during 92 days, after 21 days of adaptation. The animals were fed a diet with 20% of the dry matter as corn silage, with 40% of grain. Treatments evaluated included levels of 0, 25, 40 and 55% of dehydrated citrus pulp pellets in the dry matter diet. There was no effect of citrus pulp level on the average daily gain, daily dry matter intake, feed efficiency, carcass dressing, Longissimus muscle area and the kidney, pelvic and inguinal fat. The increasing level of citrus pulp on the diet decreased linearly the backfat thickness and increased linearly the liver weight and carcass weight. The feces pH was similar for all the citrus pulp levels. Liver abscess were not detected, although the diet had high concentrate level. The dehydrated citrus pulp pellets can compound until 55% of dry matter diet, replacing corn grain to finishing young bulls fed high concentrate diets, with a small decrease in subcutaneous fat. O experimento foi desenvolvido com o objetivo de avaliar o efeito da substituição do milho pela polpa cítrica peletizada sobre o desempenho e as características da carcaça de tourinhos Santa Gertrudes confinados. Vinte e oito animais, com nove meses de idade e peso inicial de 277 kg, foram confinados em baias individuais. O período experimental foi de 92 dias, após 21 dias de adaptação. Os animais receberam dietas contendo 20% da matéria seca como silagem de milho, com 40% de grãos. Foram testados os níveis de 0, 25, 40 e 55% de participação da polpa cítrica peletizada na matéria seca da dieta. Não houve efeito do nível de polpa cítrica na dieta sobre ganho de peso, ingestão diária de matéria seca, eficiência alimentar, rendimento de carcaça, área de olho de lombo e peso da gordura renal-pélvica-inguinal. Os pesos do fígado e da carcaça foram significativamente maiores com o aumento da polpa cítrica na dieta, que também determinou decréscimo linear na espessura de gordura sobre a 12ª costela. O pH das fezes foi semelhante entre os níveis de participação da polpa cítrica. Não foi verificada a ocorrência de abscessos no fígado em nenhum tratamento, apesar da dieta conter alto teor de concentrado. A polpa cítrica peletizada pode compor até 55% da matéria seca de dietas, substituindo o milho em grão, para tourinhos em terminação recebendo altos níveis de concentrado, apenas com diminuição da espessura de gordura.