Effects of lactation stage - parity - beta lactoglobulin genotype and milk SCC on whey protein composition in Sarda dairy ewes [Somatic Cell Count]

• Published in: Italian journal of animal science Vol. 2; no. 1; pp. 29 - 39
• Main Authors: Nudda, A, Battacone, G, Macciotta, N.P.P, Pulina, G. (Sassari Univ. (Italy). Dipartimento di Scienze Zootecniche), Feligini, M. (Istituto Sperimentale Italiano Lazzaro Spallanzani per la Fecondazione Artificiale, Milan (Italy))
• Format: Journal Article
• Language: English
• Published: Taylor & Francis 01.01.2003; Taylor & Francis Group
• Subjects: ALBUMINE; ALBUMINS; ALBÚMINAS; BETA LACTOGLOBULIN; BETA LACTOGLOBULINA; BETA LACTOGLOBULINE; BETA LATTOGLOBULINA; BREBIS; CASEIN; CASEINA; CASEÍNA; CASÉINE; CCS; CERDEÑA; CONTEGGIO DELLE CELLULE SOMATICHE; CONTEO DE CÉLULAS SOMÁTICAS; Dairy ewes; Dairy ewes, Milk whey protein, Lactation stage, Parity, SCC; EWE MILK; EWES; GENOTIPI; GENOTIPOS; GENOTYPES; GRASA DE LA LECHE; GRASSO DEL LATTE; GÉNOTYPE; IMMUNOGLOBULINE; IMMUNOGLOBULINS; INMUNOGLOBULINA; LACTACIÓN; LACTATION; Lactation stage; LACTOFERRIN; LACTOFERRINAS; LACTOFERRINE; LACTOSA; LACTOSE; LAIT DE BREBIS; LATTAZIONE; LATTE DI PECORA; LATTOFERRINA; LATTOSIO; LECHE DE OVEJA; MATIÈRE GRASSE DU LAIT; METODI STATISTICI; MILK FAT; MILK PROTEIN; Milk whey protein; MILK YIELD; MÉTHODE STATISTIQUE; MÉTODOS ESTADÍSTICOS; NUMÉRATION CELLULAIRE SOMATIQUE; Ordine di parto; OVEJA; Parity; PARTO; PARTURITION; PECORE; Pecore da latte; PROTEINE DEL LATTE; PROTEINE DEL SIERO DI LATTE; PROTEÍNAS DE LA LECHE; PROTEÍNAS DE SUERO DE LECHE; PROTÉINE DE LACTOSÉRUM; PROTÉINE DU LAIT; RENDEMENT LAITIER; RENDIMENTO IN LATTE; RENDIMIENTO LECHERO; SARDAIGNE; SARDEGNA; SARDINIA; SCC; Sieroproteine; SOMATIC CELL COUNT; Stadio di lattazione; STATISTICAL METHODS; WHEY PROTEIN
• ISSN: 1594-4077; 1828-051X; 1828-051X
• DOI: 10.4081/ijas.2003.29

In 90 Sarda dairy ewes the effects of lactation stage, parity, β-lactoglobulin genotypes, and somatic cell count (SCC) on the milk content of total protein (TP), casein (CN), whey protein (WP) and its fractions α-lactalbumin (ALA), β-lactoglob-ulin (BLG), serum albumin (SA), immunoglobulin (IG) and lactoferrin (LF) were analysed using a linear mixed model. Mean values of variables (g/l) were: TP (54.0), CN (43.0), WP (11.0), BLG (4.78), ALA (1.37), SA (0.61), IG (3.83) and LF (0.28). The lactation stage significantly affected all the variables analysed. TP, CN and WP concentrations tended to increase throughout lactation, with the increase of WP being more pronounced than the corresponding variation in CN. There was no definite trend in BLG content, whereas ALA concentration decreased as lactation progressed. The parity affected almost all variables studied. WP concentration differed significantly only between the second and fourth parity (10.45 vs 11.44 g/l). BLG and SA concentrations were significantly lower in the youngest ewes. The BLG genotype affected milk yield, but no effects were observed on the components of the milk. The SCC influenced almost all variables studied. The TP concentration was significantly higher in milk with SCC >1,000,000 (55.0 g/l) than in milk with lower SCC (53.4 g/l). This was mainly due to the increase of WP (12.52 and 10.24 g/l in milk with SCC above and below 1,000,000/ml respectively), especially in those WP fractions originating from blood.