Intake, apparent digestibility, production, and composition of milk from cows fed diets with different sources of lipids

• Autor(a) principal: Murta, Rogério Mendes
• Data de Publicação: 2016
• Outros Autores: Veloso, Cristina Mattos, Pires, Aureliano José Vieira, Silva, Fabiano Ferreira da, Carvalho, Gleidson Giordano Pinto de, Eustáquio Filho, Antônio, Maranhão, Camila Maida de Albuquerque, Cruz, Cláudia Horne da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://dx.doi.org/10.1590/S1806-92902016000200003; http://www.locus.ufv.br/handle/123456789/14943
• topic: Cottonseed; Dairy cows; Fat; Performance; Ruminant nutrition; Soy

The objective of this study was to evaluate the effect of different sources of lipids in the diets of dairy cows on the intake and digestibility of nutritional fractions, and milk production and composition. The experiment was conducted in a 42-hectare area divided into eight paddocks covered with Brachiaria brizantha. Twelve crossbred Holstein × Zebu cows were distributed into three simultaneous 4 × 4 Latin squares. The treatments consisted of different sources of lipids, as follows: diet with no extra source of lipids; diet with cottonseed as the source of lipids; diet with soy oil; and diet with used frying soy oil. The intakes of dry matter, neutral detergent fiber, crude protein, total carbohydrates, and non-fibrous carbohydrates were similar for all diets. The use of lipid sources caused a decrease in the apparent digestibility of dry matter, neutral detergent fiber, non-fibrous carbohydrates, and crude protein. The levels of protein, lactose, and defatted dry matter were reduced with the use of lipid sources but did not affect milk production. The use of cottonseed, soy oil, and used frying soy oil as sources of lipids in diets for lactating cows at pasture do not improve milk production, and their use is therefore optional.