Effect of α S1-casein (CSN1S1) and κ-casein (CSN3) genotypes on milk composition in Murciano-Granadina goats

F. Caravaca, J. Carrizosa, B. Urrutia, F. Baena, J. Jordana, M. Amills, B. Badaoui, A. Sánchez, A. Angiolillo, J. M. Serradilla

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The effects of the caprine αS1-casein (CSN1S1) polymorphisms on milk quality have been widely demonstrated. However, much less is known about the consequences of the κ-casein (CSN3) genotype on milk composition in goats. Moreover, the occurrence of interactions between CSN3 and CSN1S1 genotypes has not been investigated. In this study, an association analysis between CSN1S1 and CSN3 genotypes and milk quality traits was performed in 89 Murciano-Granadina goats. Total milk yield as well as total protein, fat, solids-not-fat, lactose, αS1-casein (CSN1S1), and αS2-casein (CSN1S2) contents were recorded every other month during a whole lactation (316 observations). Data analysis using a linear mixed model for repeated observations revealed no interaction between the CSN1S1 and CSN3 genotypes. With regard to the effect of the CSN3 locus, AB and BB genotypes were significantly associated with higher levels of total casein and protein content compared with the AA CSN3 genotype. In strong contrast with French breeds, the CSN1S1 genotype did not affect protein, casein, and fat concentrations in Murciano-Granadina goats. These results highlight the importance of taking into consideration the CSN3 genotype when performing selection for milk composition in dairy goats. © American Dairy Science Association, 2009.
Original languageEnglish
Pages (from-to)2960-2964
JournalJournal of Dairy Science
Issue number6
Publication statusPublished - 1 Jan 2009


  • Goat
  • Milk composition
  • α -casein S1
  • κ-casein


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