Composição físico-química da dieta formulada e da dieta ofertada: estudo de caso em propriedades leiteiras em Bambuí
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ABSTRACT This study aimed to evaluate the differences between diets formulated by nutritionists and the diets actually offered to animals. The study was quantitative, a multiple case study, conducted in five dairy production systems selected according to technical criteria such as the presence of a nutritionist, use of a formulation program, mixer with scales, and confined system. Samples were collected between June and July 2025, a period when climatic conditions remained more stable, reducing changes in the dry matter content of the samples. Samples of the totally mixed ration (TMR) were collected directly from the feed bunk before consumption and analyzed for particle size and physicochemical composition. Particle size was determined using the Penn State Particle Separator method, while chemical analyses were performed by near-infrared spectroscopy (NIR), evaluating dry matter, crude protein, ether extract, neutral detergent fiber, non-fibrous carbohydrates, mineral matter, and total digestible nutrients. The data obtained were subjected to descriptive statistical analysis and compared using a paired t-test at a 5% probability level in the R software. A difference (P<0.05) was observed for the content of fibrous carbohydrate and non-fibrous carbohydrate between the formulated diet and the diet offered; however, this difference did not persist for the starch content. We conclude that the diets provided met the nutritional recommendations for lactating dairy cows, although some variations in the diet offered may compromise the productive efficiency of the herds. Keywords: Dairy cattle farming. Bromatological composition. Total Mixed Ration. Precision nutrition
