HUBUNGAN KUALITAS SUSU DENGAN KERAGAMAN GENETIK DAN PREVALENSI MASTITIS SUBKLINIS DI DAERAH JALUR SUSU MALANG SAMPAI PASURUAN

Abstract

The objectives of this study were to identify: (1) the differences of milk quality at the farmers' levels, post
collection, Village Cooperative Unit (VCU) and Milk Processing Industry (MPI), (2) the relation between milk
protein to genetic variety of kappa casein, (3) the relation between the milk bacteria and the subclinical mastitis
prevalence. Completely Randomyzed Design followed by Least Significant difference test was used for analyzing
the milk quality. The alele and genotype frequency were analyzed using Hardy- Weiberg method, while the
prevalence of subclinical mastitis was assessed using Chi-Square. The result of the research showed that the
percentage of chemical milk composition, based on the milk quality standard (Grade), from the level offarmer
to post collection had the biggest decrease of milk quality, especially for fat content (59.32%), TSL (58.33%)
and TPC (22.96%). Statistically especially there was no significance influence on the protein content of milk by
the frequency of alele A, alele B, genotype frequency AA and BB. Genotype frequency AB, showed significance
influence (P