Protected fat and variable level of protein in diets of crossbreed cows in early lactation

• Autor(a) principal: Souza Júnior, Alcy Heleno de
• Data de Publicação: 2016
• Outros Autores: Lana, Rogério de Paula, Teixeira, César Roberto Viana, Gionbelli, Mateus Pies, Veloso, Cristina Mattos, Rennó, Luciana Navajas
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UFLA
• Texto Completo: http://repositorio.ufla.br/jspui/handle/1/32782
• topic: Proteína dietética; Suplementação lipídica; Produção de leite; Bovinos - Lactação; Dietary protein; Lipid supplementation; Milk yield; Bovine - Lactation

Current study evaluated the inclusion of protected fat and different levels of crude protein (CP) in the diet of crossbreed cows in early lactation. Twelve cows were distributed in a 4 x 4 factorial design, with four treatments (12 or 16% CP, with or without MEGALAC-E(r)). Statistical analyzes with ANOVA and Pearson's linear correlation procedures were performed. Protected fat did not affect intake of dry matter (DM) and organic matter (OM) (p > 0.05). Increased CP raised consumption of CP and EE and decreased the non-fiber carbohydrates (NFC; p <0.05). Protected fat increased (p <0.05) the digestibility of DM, OM, CP and ashes in the lower protein content. CP increase raised the level of blood and urinary urea (p < 0.05). There was no difference (p > 0.05) on milk yield and composition due to protected fat or CP rates. Since the inclusion of protected fat and higher content of CP (16%) in the diet did not benefit the production and composition of milk in crossbreed cows, diets with 12% CP without the inclusion of protected fat are recommended.