Abstract

ALONSO, Á.C.; IRIBAN, C.A.  and  BENITEZ, Mileisys. Physical-chemical and microbiological performance of Siboney de Cuba cows milk. Cuban J. Agric. Sci. [online]. 2018, vol.52, n.2, pp.141-153.  Epub June 01, 2018. ISSN 0864-0408.

In order to evaluate physical-chemical and microbiological parameters of milk from lactating Siboney de Cuba cows in September-January 2017 interval in dairy-60 "La Jibara", the sampling at 50 % of the milking herd within the period was performed. The laboratory samples were analyzed in indicators such as: temperature, density, fat, non-fat solids, total solids, California Mastitis Test and methylene blue reduction time, according to current procedures in Cuban standards. Variables under study were analized by simple statisticians of position and dispersion, in addition to simple ANOVA and Duncan (1955) test, to determine differences according to ranges of lactation days passed during sampling, using the InfoStat statistical package. To calculate the prevalence of subclinical mastitis, the Ponce et al.(2005) formula was used. It is concluded that the physical-chemical and microbiological parameters of the milk were in the established quality ranges except for the methylene blue reduction time, which was lower than what the norm proposes. Statistical differences were observed for lactation intervals in density, fat and non- fat solids, associated to changes in quality of the food registered at the end of the rainy period and the beginning of the season. The percentage of samples with prevalence of subclinical mastitis is considered high with 66 % versus only 34 % negative, which considerably reduces the quality of the milk produced and the clinical state of the udder of females in production.

Keywords : cows in lactation; milk quality; subclinical mastitis; food quality.

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