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Short communication: Effect of _S1-casein (CSN1S1) and -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^# and J. M. Serradilla^,1

^* Departamento de Ciencias Agroforestales, Escuela Universitaría de Ingenieria Técnica Agricola, Universidad de Sevilla, 41013 Sevilla, Spain
Instituto Murciano de Investigación y Desarrollo Agrario y Alimentario (IMIDA), Estación Sericícola, La Alberca, Murcia, Spain
Departamento de Producción Animal, Campus de Rabanales, Universidad de Córdoba, 14071 Córdoba, Spain
Departament de Ciència Animal i dels Aliments, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain
^# Dipartimento di Scienze e Tecnologie per l'Ambiente e il Territorio–Università del Molise, 86090 Pesche (IS), Italy

¹ Corresponding author: pa1semaj{at}uco.es

The effects of the caprine _S1-casein (CSN1S1) polymorphisms on milk quality have been widely demonstrated. However, much less is known about the consequences of the -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, _S1-casein (CSN1S1), and _S2-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.

Key Words: goat • _S1-casein • -casein • milk composition