The objective of this study was to determine the noise levels during milking inmechanical milking systems (fixed and mobile) and their relationship with animal welfareand milk quality. The noise levels were measured in eight farms located in the municipalitiesof La Sabana de Bogotá (Colombia). The exposure of cows to noise was measured in themilking parlour (RUME), in the milking parlour before the milking (RUIN) and at the endof milking, with the equipment turned off (RUFI). Milking was also classified according to the noise level as noisy milking and milking with tolerable noise. The groups were comparedin relation to the production, composition and quality of milk, as well as behavior associatedwith stress. Significant differences were found for the somatic cell count and the numberof mesophilic bacteria (p<0.05), being higher in the so-called noisy milking.

El objetivo del trabajo fue determinar los niveles de ruido durante el ordeño de vacasen sistemas de ordeño mecánico (fijo y móvil) y su relación con el bienestar animal y lacalidad de la leche. Los niveles de ruido se midieron en ocho granjas ubicadas en municipiosde la Sabana de Bogotá. La exposición al ruido de las vacas se midió en la sala deordeño (RUME), durante la parada en el área antes de la sala de ordeño (RUIN) y al finaldel ordeño, con el equipo apagado (RUFI). Independientemente del tipo de ordeño, losordeños fueron clasificados según el nivel de ruido como ordeño ruidoso (OR) y ordeñocon ruido tolerable (OT). Los grupos se compararon en relación con la producción,composición y calidad de la leche, así como con los comportamientos asociados al estrés.Se encontraron diferencias significativas para el recuento de células somáticas y el númerode bacteri...

The aim of the study was to evaluate the effect of four antibiofilm peptides (ACLL37-1, ACLL37-2, DLL37-1 and LL37-1) on microbiological isolates in raw cattle milk. An experimental descriptive pilot study was applied with milk samples from 14 milking cows. The microbiological isolation was made, the biofilm was extinguished by crystal violet, growth curves and the antibiofilm effect was evaluated with the peptides under study. From 56 milk samples, 41 microorganisms were isolated and 69.2% corresponded to negative coagulase-negative Staphylococcus (SCN). Likewise, 30 strains were identified as strong biofilm-forming adherents (73.2%) and 7 (17.1%) weakly adherents. In the growth curves with the peptides, an increase in the late lag phase was demonstrated and regarding the inhibitory effect of the peptides, it was found that they present a heterogeneous behavior compared to each isolate;...