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The aim of the study was to compare the physical and chemical composition of the raw milk of crossbred cows in different production levels and influence of parity order and stage of lactation on milk chemical composition of high producing cows. The search was conducted in the municipality of Rio Verde in southwestern Goias, 784 samples were collected from raw milk of crossbred cows in experiment I and were divided into three levels of production. In the second experimental procedure, the samples resulted in 657 samples of raw milk, being divided into 4 stages of lactation stage of the cows and divided into eight parity order in which first-calf heifers corresponded to first order, and multiparous cows from the second until the eighth creates. For analysis of variance and mean comparison was used lineation all casualized and we used the Tukey test at 5% probability, using the software SISVAR. The different levels of production resulted in physico-chemical differences of the constituents of milk, thus the percentages found may be related not only the level but also at the stage of lactation and parity order of the animals.

RELAÇÃO DA COMPOSIÇÃO QUÍMICA DO LEITE COM O NÍVEL DE PRODUÇÃO, ESTÁDIO DE LACTAÇÃO E ORDEM DE PARIÇÃO DE VACAS MESTIÇAS