Published in Scientific Papers. Series D. Animal Science, Vol. LXVIII, Issue 2
Written by Svetoslava STOYCHEVA, Lora MONDESHKA
This study examines the changes in the physicochemical composition of goat colostrum during the first five days postpartum, as well as the composition of goat milk on the 40th day of lactation. A total of 69 colostrum samples and 16 milk samples were analyzed, collected according to a schedule from 16 crossbred goats (Murciana Granadina × Bulgarian White Dairy - MG×BWD). The fat content decreased significantly from 7.13% on the first day to 4.74% on the fifth day and remained relatively stable (4,57%) up to the 40th day. The solid-non-fat content also declined, from 13,08% to 8,51%, with a notable drop during the first five days. Protein content decreased from 8,26% to 3%, and the salts also showed a significant reduction. The total solids decreased from 20,22% on the first day to 13,33% on the 40th day, reflecting an overall decline in other components. The freezing point rose (-0,796°C to -0,528°C), correlating with the reduced concentration of soluble substances. These changes indicate the gradual transformation of colostrum in to milk.
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