title: Effects of sheep alpha s1-casein CC, CD and DD genotypes on milk composition and cheesemaking properties.
abstract: The effects of sheep alpha s1-casein CC, CD and DD genotypes on milk composition and cheese yield were studied. Processed bulk milk was collected from three groups of 15 ewes, carrying alpha s1-casein CC, CD and DD genotypes. CC milk was higher in casein content than CD or DD milk (+3.5 and +8.6% respectively), and had a higher protein: fat ratio and a smaller casein micelle diameter. In addition, DD milk had a significantly lower alpha s1-casein content. The main differences were in curd formation: CC milk had better renneting properties. Cheesemaking trials, carried out in a pilot plant, showed that CC milk had better cheesemaking characteristics than DD milk, while CD milk was intermediate. Both 1 d old and fully ripened cheeses had different fat: dry matter ratios and alpha s1-I-casein electrophoretic mobilities: these were lower for DD cheese. As a consequence, these genotypes could be considered as markers of milk and/or cheese quality.
authors.affiliation: Istituto Zootecnico e Caseario per la Sardegna, Olmedo, Italia.
authors.forename: A
authors.initials: A
authors.lastname: Pirisi
authors.forename: G
authors.initials: G
authors.lastname: Piredda
authors.forename: C M
authors.initials: CM
authors.lastname: Papoff
authors.forename: R
authors.initials: R
authors.lastname: Di Salvo
authors.forename: S
authors.initials: S
authors.lastname: Pintus
authors.forename: G
authors.initials: G
authors.lastname: Garro
authors.forename: P
authors.initials: P
authors.lastname: Ferranti
authors.forename: L
authors.initials: L
authors.lastname: Chianese
mesh_terms: D000818:Animals; D002364:Caseins / Q000737:chemistry / Q000235:genetics*; D002611:Cheese / Q000032:analysis; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004591:Electrophoresis, Polyacrylamide Gel; D005260:Female; D005838:Genotype; D015151:Immunoblotting; D007525:Isoelectric Focusing; D013058:Mass Spectrometry; D008823:Micelles; D008892:Milk / Q000737:chemistry*; D010316:Particle Size; D012756:Sheep
chemical_list: D002364:Caseins; D008823:Micelles