Abstract
The Brazilian Legislation guarantee minimum levels of nutrients to animal feed and these information on the label are used to take purchase decisions to get dairy cattle concentrate feed. It is necessary that the declared values on the labels being more precise as possible. The bromatological analysis allows to verify the real nutrition values and help us in the purchase of the products that attending to the needs of dairy cattle. The objective of this work was to evaluate the centesimal composition of three different commercial dairy cow concentrate and to compare these values with declared on the labels. Physical chemical analysis were carried out to determine the acid detergent fiber (ADF), neutral detergent fiber (NDF), dry matter (DM), total protein (TP), total fiber (TF), minerals (M), fat (F), Calcium (Ca) and Phosphorus (P). The observed values (OV) were compare to the declared label values (DV) by the maker. Following the legislation, it was created a classification criteria to the adequation of the labels: to conform label (C) - samples that presented label values different from those obtained by laboratorial analysis. The maximum and minimum values from the laboratorial analysis were compared to the values permitted by the Brazilian Agriculture Ministry. The results were submitted to ANOVA and Tukey Test at 5% of significance to verify the interactions between the averages. The dairy cow concentrate studied at Vale de São Patrício were considered as good quality and they attending to Brazilian legislation parameters. Through the laboratorial analysis we could verify there was no difference between the samples A, B and C to humidity, dry matter, total protein, fat, minerals, Calcium and Phosphorus levels. Although this, it was observed that the relation between the declared label values and the results from laboratorial analysis differed to some nutritional components of the studied commercial concentrates like humidity.
 Keywords: Bromatological analysis, dairy cattle, nutrition, nutrients, labeling.
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