The aim was to establish the genetic diversity and population structure of three guinea pig lines, from seven production zones located in Nariño, southwest Colombia. A total of 384 individuals were genotyped with six microsatellite markers. The measurement of intrapopulation diversity revealed allelic richness ranging from 3.0 to 6.56, and observed heterozygosity (Ho) from 0.33 to 0.60, with a deficit in heterozygous individuals. Although statistically significant (p < 0.05), genetic differentiation between population pairs was found to be low. Genetic distance, as well as clustering of guinea-pig lines and populations, coincided with the historical and geographical distribution of the populations. Likewise, high genetic identity between improved and native lines was established. An analysis of group probabilistic assignment revealed that each line should not be considered as a genetically homogeneous group. The findings corroborate the absorption of native genetic material into the improved line introduced into Colombia from Peru. It is necessary to establish conservation programs for native-line individuals in Nariño, and control genealogical and production records in order to reduce the inbreeding values in the populations.

Agricultural production seeks to obtain high quality, safe products for human consumption-a great concern for the dairy chain. The present investigation seeks to identify the correlation between the compositional and sanitary quality of raw milk (SCC/mL). The investigation was carried out in three districts of the Department of Nariño, Colombia. For this purpose, sampling and information collection was executed throughout the years 2016 and 2017. To determine the relationship between composition and sanitary quality, an analysis was made of the principal components of the milk, and a design of mixed models was creating using selected variables. The analysis showed that there is a relationship between the compositional variables, and the mixed model indicated that there is a significant relationship between the somatic cell count and the milk quality of the region. It was concluded that a somatic cell count above 500,000 CFU/mL has negative effects on protein, casein, and milk production.

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