Relationship of total bacterial and somatic cell counts with milk production and composition – multivariate analysis

Abstract

This study was realized to evaluate the monthly production, composition and quality of milk (total and defatted dry extract, lactose, fat and protein) and their relation to somatic cell count (SCC) and total bacterial count (TBC) using multivariate statistical analyses. The data are from a dairy farm for the period of two years (from January 2015 to December 2016). The SCC and TBC variables were transformed to somatic cell score (SCS) and log10 (LogTBC). Factor analysis, discriminant analysis and cluster analysis were used. Through factor analysis, it was found two factors that together explained 69.5% of the total data variation. The first factor represented the inverse relationship between lactose versus fat and protein content, while the second factor represented the inverse relationship among monthly milk yield versus SCS and LogTBC. The discriminant analysis identified that lactose and protein contents and SCS were the variables that had the greatest participation in the separation of the groups formed by the cluster analysis. The groups differed mainly by the monthly production of milk, composition and SCS. Finally, there are important multivariate relations between the variables milk production, composition and quality.

Estimating milk production losses by heat stress and its impacts on greenhouse gas emissions in Korean dairy farms

“…Furthermore, economic evaluation by milk production was calculated as 926 won/kg. This evaluation included the price of milk compositions such as MF and MP, and hygiene parameters such as SCC and TBC levels, which were announced by the KDC in 2018 [21].…”

Season effects on the composition of milk produced by a Holstein herd managed under semi-confinement followed by compost bedded dairy barn management

“…between 05:00 and 05:30 hours). A similar practice is normal in the Noroeste Rio-grandense mesoregion (Haygert-Velho et al, 2018;Botton et al, 2019). Although only slight, this change in milking schedule affects the well-being of people and enables voluntary intake of feed by cows early in the morning (Van Soest, 1994), as it is consistent with the natural timing of the main daily meals for ruminants.…”

Influência das estações do ano sobre a qualidade microbiológica do leite de fazendas leiteiras da região norte do Rio Grande do Sul, Brasil

“…Altas concentrações de CCS indicam uma ação inflamatória na glândula mamária (28) . A maioria dos leucócitos migram do sangue para o tecido mamário, em resposta a uma agressão física, química ou infecciosa (29) .…”