Níveis de concentrado para vacas mestiças leiteiras em pastejo, no período das águas

• Ano de defesa: 2013
• Autor(a) principal: Ghedini, Caren Paludo
• Orientador(a): Lana, Rogério de Paula
• Banca de defesa: Veloso, Cristina Mattos , Barbosa, Fabiano Alvim , Teixeira, Rafael Monteiro Araújo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Zootecnia
• Departamento: Genética e Melhoramento de Animais Domésticos; Nutrição e Alimentação Animal; Pastagens e Forragicul
• País: BR
• Palavras-chave em Português: Concentrado; Leite; Pasto; Vacas
• Palavras-chave em Inglês: Concentrate; Milk; Pasture; Cows
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::ZOOTECNIA::NUTRICAO E ALIMENTACAO ANIMAL
• Link de acesso: http://locus.ufv.br/handle/123456789/5765

It was investigated the effects of adding increasing levels of concentrate on efficiency of use of the diet and performance of crossbred cows on pasture (pasture of Brachiaria brizantha cv Marandu) during the rainy season. Eight crossbred Holstein:Zebu cows after peak lactation (body weight 495 ± 54 kg and average initial production of 13.2 ± 2.4 kg/day of milk) were used, being divided into two 4x4 Latin squares, according to milk production. The experiment period lasted 14 days each, with the first seven days for adaptation and the other for data collection. Four levels of concentrate supplementation were evaluated: 0.6, 1.2, 2.4, and 4.8 kg/cow/day (as fed basis) with 25% crude protein in dry matter, based on corn and soybean meal (60:40), provided during the two daily milkings. The increased level of concentrate did not affect dry matter intake (P=0.157), indicating substitution rate of approximately 1:1. Nutrient digestibility increased with increasing level of concentrate, except that NDF digestibility was not affected (P=0.968). Spite of higher nutrient digestibility (except NDF) there was no effect on the consumption of digestible organic matter intake. Likewise urinary excretion of allantoin and uric acid was not different at different levels of concentrate. Milk production was not affected by increasing concentrate; however, the protein content in the milk increased linearly (P=0.0056) and fat content decreased linearly (P=0.0188) with increasing concentrate supplementation. Crossbred cows in mid lactation on pasture during the rainy season reached its production potential with the use of 0.6 kg/day of concentrate supplement, not requiring higher levels of supplementation.