Quality of mil, before and after the Normative Instruction 51, in the Middle Piracicaba (MG) / Qualidade do leite, antes e depois da Instrução Normativa 51, na região do Médio Piracicaba (MG)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The objective is to assess the quality of milk based on the requirements of the Normative Instruction 51 (IN51) to the results of total bacterial count (CBT), somatic cell count (SCC), crude protein (CP) and fat in the period 2004 to 2007, the Cooperative of Rural Producers Alvinópolis Ltda., in 151 properties, totaling 5.436 observations. To better assess the impact of IN51 on milk quality, the periods were subdivided into three: period 1: 01/07/2004 to 30/06/2005; period 2: 01/07/2005 to 30/06/2006; and period 3: 01/07/2006 to 30/06/2007, and was used hierarchical clustering with Euclidean distance average to establish three groups of milk producers based on the volume of monthly production: group A: 11 to 178 liters of milk/day; group B: 208 to 657 liters of milk per day; and group C: 942 to 1,251 liters of milk/day). There was no interaction between time and group of producers to CBT, but there was an influence (P <0.05) of the group and the period for this variable. Group A was the only one to make difference (P <0.05) in CBT between the months of the year. The CCS has not decreased between periods. However, the CCS was below the values required by IN51 from 2005 to 2008. There was influence (P <0.05) for the CCS group, independent of the evaluation period. Assessing the CCS for each group of producers in terms of months, only group A showed significant differences (P <0.05).There was interaction (P <0.05) between groups of producers of milk and the periods for protein (CP). Within group A, samples of milk with lower (P <0.05) concentrations of CP were those of the first period. For the group C, it was observed that in the 3rd period the concentrations of CP were higher (P <0.05) to the 2nd period; however the observed values of period did not differ in the 1st period. Within the periods, samples of milk from group A had higher (P <0.05) concentrations of CP in the other groups. There was influence (P <0.05) groups of milk producers on the concentration of milk fat samples analyzed, regardless of the evaluation period. The milk concentrations of CP and fat were affected (P <0.05) by months of the year.

ASSUNTO(S)

adequação milk quality producao animal qualidade do leite normative instruction instrução normativa

ACESSO AO ARTIGO

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