Feeding management and production factors affecting goat milk composition and quality. II. Physical and chemical properties and mineral content
2007
Summer, A.; Superchi, P.; Sabbioni, A.; Formaggioni, P.; Mariani, P., Università degli Studi di Parma (Italy). Dipart. di Produzioni Animali, Biotecnologie Veterinarie, Qualità e Sicurezza degli Alimenti
Individual milk samples representing the overall morning milking were collected monthly (from April to September) from 24 Saanen goats, uniformly distributed into two herds in Northern Italy with the aim to evaluate the factors affecting physico-chemical properties and mineral content. Herds differed in feeding management system: "Traditional" and "Total mixed ration" ("TMR"). Herd type was related to milk chemical composition; compared o "TMR", "Traditional" herd type improved dry matter content and lowered ash. Milk dry matter was related to fat, protein and lactose; ash was related to milk yield, fat and protein; freezing point was related to lactose, urea and fat. Ca, P and Mg contents were influenced by the herd type, with lower values in "Traditional" than in "TMR". A positive relationship was found between: milk yield and P and K; protein and Ca, P, Mg and Na; lactose and Ca and P; somatic cells and Mg; pH and Na; urea and Na. A negative relationship was found between: protein and K; lactose and Na and K; pH and P. Potassium content was higher for primiparous goats and for single delivery goats
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