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Effects of stage and number of lactation on the chemical composition of goat milk

The aim of this research was to establish the effects of stage and number of lactation on changes in the chemical composition of goat milk (Alpine and Saanen) during five consecutive lactation periods. All animals were milked manually and kept under the same accomodation and feeding conditions. Milk analyses included determinations of the content of dry matter, solids non fat, fat, protein, lactose, ash, calcium and phosphorus. Established average minimum and maximum contents (%) were as follows: dry matter (11.15-11.90) ; solids non fat (7.89-8.48) ; fat (3.26-3.58) ; protein (2.73-3.04) ; lactose (4.18-4.50) ; ash (0.792-0.802) ; calcium (0.110-0.124) ; phosphorus (0.083-0.092). During the five lactations, significantly higher (P<0.01) contents of dry matter, solids non fat, lactose, calcium and (partially) phosphorus were determined at the beginning of lactations in coparison with the middle of lactation. Significant correlations (P<0.01) were established between the content of dry matter and the content of solids non fat (0.76), fat (0.77), protein 80.64) and lactose (0.46).

Goat milk; Alpine; Saanen; Chemical composition; Stage and number of lactation

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