ELECTROPHORETIC FRACTIONS OF PROTEINS OF MILK FROM THE MURCIANO-GRANADINA GOAT DURING LACTATION
Abstract
Sodium dodecylsulfate (SDS)-polyacrylamide gel electrophoresis of the milk of 108 goats of the Murciano Granadina breeds was made for the purpose of determining the relative percentages of the casein,and whey protein fractions in the colostmm, suckling, weaning and milking periods of the lactation curve. In the first four days after parturition, the relative values of the protein fractioning undergo the most important change in the whole of lactation period. This is especially significant (p<= 0,001) in the whey proteins. During the suckling period (15 to 70 days after parturition) the overall relative means of 21,74%, 71,06% and 7,10% for a , ß and K- casein respectively, were recorded; and overall relative means of 63,52%, 12,94% and 23,50% for ß-lactoglobulin. a -lactoalbumin and other whey proteins respectively. Weaning does not appear to change the relative or percentage composition of the protein fractions during the four days following. More important percentage variations were detected in the milking period than those recorded in the suckling and weaning periods. The overall relative means from weaning (70 days after parturition) until milk loss (210 days after parturition) were 26,43%, 65,50% and 8.03% for a, ß and K-casein respectively and 66,53%, 18,14% and 15,34% for ß-lactoglobulin a-lactoalbumin and other whey proteins respectively.Downloads
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