title: Effects of α s1-casein (CSN1S1) and κ-casein (CSN3) genotypes on milk coagulation properties in Murciano-Granadina goats.
abstract: The effects of the caprine α s1-casein (CSN1S1) polymorphisms on milk quality and cheese yield have been widely studied in French and Italian goat breeds. Much less is known about the consequences of κ-casein (CSN3) genotype on the technological and coagulation properties of goat milk. In the current study, we have performed an association analysis between polymorphisms at the goat CSN1S1 and CSN3 genes and milk coagulation (rennet coagulation time, curdling rate and curd firmness) and technological (time to cutting of curd and cheese yield) properties. In this analysis, we have included 193 records from 74 Murciano-Granadina goats (with genotypes constituted by different combinations of alleles B, E and F of the gene CSN1S1 and alleles A and B of the gene CSN3) distributed in three herds, which were collected bimonthly during a whole lactation. Data analysis, using a linear mixed model for repeated observations, revealed significant associations between CSN1S1 genotypes and the rate of the curdling process. In this way, milk from EE goats had a significantly higher curdling rate than milk from BB individuals (P<0Â·05). Contrary to previous experiments performed in French breeds, cheese yield was not significantly different in BB, EE and EF goats. Moreover, we have shown that CSN3 genotype has a significant effect on the rennet coagulation time (BB>AB, P<0Â·05) but not on cheese yield. No interaction between the CSN1S1 and CSN3 genotypes was observed.
authors.affiliation: Departamento de Ciencias Agroforestales, E.U.I.T.A., Universidad de Sevilla, 41013 Sevilla, Spain.
authors.forename: Francisco
authors.initials: F
authors.lastname: Caravaca
authors.forename: José Luis
authors.initials: JL
authors.lastname: Ares
authors.forename: Juan
authors.initials: J
authors.lastname: Carrizosa
authors.forename: Baltasar
authors.initials: B
authors.lastname: Urrutia
authors.forename: Francisca
authors.initials: F
authors.lastname: Baena
authors.forename: Jordi
authors.initials: J
authors.lastname: Jordana
authors.forename: Bouabid
authors.initials: B
authors.lastname: Badaoui
authors.forename: Armand
authors.initials: A
authors.lastname: Sànchez
authors.forename: Antonella
authors.initials: A
authors.lastname: Angiolillo
authors.forename: Marcel
authors.initials: M
authors.lastname: Amills
authors.forename: Juan Manuel
authors.initials: JM
authors.lastname: Serradilla
mesh_terms: D000483:Alleles; D000818:Animals; D002364:Caseins / Q000235:genetics*; D002611:Cheese; D011232:Chemical Precipitation; D012085:Chymosin / Q000737:chemistry; D005260:Female; D005838:Genotype; D006041:Goats / Q000235:genetics* / Q000502:physiology*; D008892:Milk / Q000737:chemistry*; D011110:Polymorphism, Genetic / Q000235:genetics
chemical_list: D002364:Caseins; C025350:rennet; D012085:Chymosin