RECONHECIMENTO DE ESTRESSE EM BEZERRO UTILIZANDO MEDIDA DE VOCALIZAÇÃO

RAFAEL AUGUSTO DA SILVA; YAMILIA BARRIOS TOLON; IRENILZA DE ALENCAR NÄÄS; DANIELLA JORGE DE MOURA; SILVIA REGINA LUCAS DE SOUZA

doi:10.18011/bioeng2007v1n3p219-225

Authors

RAFAEL AUGUSTO DA SILVA Faculdade de Engenharia Agrícola – UNICAMP. Cx. P. 6011, Campinas, SP, Brasil.
YAMILIA BARRIOS TOLON Faculdade de Engenharia Agrícola – UNICAMP. Cx. P. 6011, Campinas, SP, Brasil.
IRENILZA DE ALENCAR NÄÄS Faculdade de Engenharia Agrícola – UNICAMP. Cx. P. 6011, Campinas, SP, Brasil.
DANIELLA JORGE DE MOURA Faculdade de Engenharia Agrícola – UNICAMP. Cx. P. 6011, Campinas, SP, Brasil.
SILVIA REGINA LUCAS DE SOUZA Faculdade de Engenharia Agrícola – UNICAMP. Cx. P. 6011, Campinas, SP, Brasil.

DOI:

https://doi.org/10.18011/bioeng2007v1n3p219-225

Keywords:

animal welfare, individual box, welfare assessment

Abstract

Calf management in commercial milk production requires the separation of the calf from the cowa short time after delivery. This management raises two opinions: one is that it allows higherprotection to the young animal; and the other is that this procedure is harmful limiting its movementand resulting in low welfare condition. This research had the objective of estimating stress conditionin female calves reared in individual boxes by measuring their vocalization. Five female calveswere used divided into two groups related to their age: two were older and three were younger.The vocalization emitted by the animals was recorded and processed. The frequency and noiselow and high pith spectrum were studied. It was not found difference between the quantity of peaknoise and the female calves' age group. The results showed that in all studied animal resultingspectra it was observed a decrease in the amplitude with the increase of the frequencies, wherethe highest amplitudes were of low pitch which is an indication of stress. It was also found that thelength of time of the young calves was longer indicating a state of fear. It was concluded thatyoung calves present higher stress when separated from the cow

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