Resumen

PETERS, M.D.P. et al. Aversive management in dairy cattle and effects on well-being, behaviour and productive aspects. Arch. zootec. [online]. 2010, vol.59, n.227, pp.435-442. ISSN 1885-4494.

This study evaluated the effects of aversive and non-aversive management on behaviour of Holstein cows for the following variables: reactivity (Re), defecation (De), urination (Mi), time spent in the milking parlour (TPO), duration of milking (TOR), milk production (PL), chemical composition of milk and somatic cells counting (CCS). Thirty two 60-96 months old Holstein cows, raising under semi-extensive system were used and submitted to the following treatments, in complete randomized blocks: T1= aversive management and T2= non-aversive management. Significant differences were found between managements for reactivity (p<0.0001), defecation (p= 0.0208) and urination (p= 0.0007). Cows aversively managed were the most reactive and showed the highest occurrence of defecation in the milking parlour. However, cows submitted to aversive management showed the lowest occurrence of urination in the milking parlour. There was significant interaction (p<0.0001) for management and days, regarding to TPO and TOR. For milk production there was significant interaction (p= 0.0062) between management and cow age. Cows averaging 60 months of age, submitted to aversive management produced less milk than cows non-aversively managed (8.68 kg milk/day and 11.50 kg milk/day), respectively. No significant differences were found for milk components and somatic cells. The aversive management alters the behaviour of dairy cows in the milking parlour, affecting the animal well-being and reducing milk production of cows with an average age of 60 months.

Palabras clave : Ethology; Milk; Handler; Cows.

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