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FREEZING POINT DEPRESSION OF RAW GOAT'S MILK FROM THE REGION OF GOIÂNIA, BRAZIL

  • de Sousa, J.T. ;
  • Dias, M.J. ;
  • Tanezini, C.A. ;
  • D'Alessandro, W.T. ;
  • de Olineira, B.C. ;
  • de Melo Rocha, J. ;
  • dos Santos Pontes, I.
  • Received : 1993.01.26
  • Accepted : 1993.07.23
  • Published : 1993.12.01

Abstract

Studies at freezing point depression (FPD) for goat milk are described in this paper. The 432 samples of raw goat milk collected in a period of two years and analysed by the use of an electronic cryoscope gave a mean value of FPD: $-0.565{\pm}0.01^{\circ}C$. Statistical significant differences were found between the morning and evening milk. The evening milk showed better quality considering the lactose and others dissolved solutes. Among the Brown, Saanen and Anglo-nubian goats, the greatest increase in FPD, occurred in the Anglo-nubian breed. The statistical analysis revealed a significant breed difference (p<0.05), when climate variation was observed. The superior and inferior values found to the FPD of the caprine milk (-0.545 to $-0.585^{\circ}C$), is important in establishing regional rules, to improve the quality control criteria and legal interpretation of standards found in the pertinent legislation. The results are also important to improve herd management so that one can increase the animal production which will affect the technological composition, and the nutritional characteristics of the resultant products.

Keywords

Goat's Milk;Freezing Point Depression;Quality Control;Breed;Climate;Lactation Time