The objective of this study was to evaluate the effects of five levels of condensed tannins (CT) from black wattle (Acacia mearnsii) in the diets of lactating dairy cows on intake, nutrient digestibility, ruminal microbial protein synthesis, milk production, composition, oxidative profile, and blood metabolites. Five Holstein cows (88 ± 26.8 days in milk) were allocated in a 5 x 5 Latin square design for a period of 20 days (14 days of diet adaptation and six for sampling). Treatments were the inclusion levels of CT at 0, 5, 10, 15 and 20 g/kg of dry matter (DM) in the diet. There was no effect of CT on DM intake. The digestibility of DM and neutral detergent fiber changed quadratically, with the maximum values at 12.2 and 11.4 g/kg of DM, respectively. There was no effect on ruminal microbial protein synthesis and milk production; however, milk casein concentration was reduced linearly. There was no effect on the milk oxidative profile. Inclusion of CT at levels up to 20 g/kg of DM did not affect intake or microbial protein synthesis; however, added CT depressed the production of energy corrected milk and milk casein concentration.
A utilização de resíduos agroindustriais na alimentação de ruminantes além de promover a redução no custo da alimentação, reaproveita a matéria orgânica de origem vegetal da indústria e evita o acúmulo destes resíduos e a contaminação ambiental, colaborando com a preservação dos recursos naturais e gerando sustentabilidade à produção animal. Neste sentido, os grãos secos de destilaria com solúveis (DDGS) é uma excelente fonte proteica na alimentação de ruminantes, além de proporcionar a produção de biocombustíveis de forma sustentável. Porém, sua inclusão na dieta de ruminantes deve ser realizada com precaução, evitando perdas produtivas do rebanho.
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