Estimates of broiler welfare have subjective character. Nowadays, researchers seek non-invasive features or indicators that may describe this condition in animal production. The aim of this study was to identify acoustic parameters to estimate broiler welfare using the following five vocalization acoustic parameters: energy, spectral centroid, bandwidth, first formant, and second formant. The database that generated the model was obtained from a field experiment with 432 broilers, which half were Cobb® and half, Ross® breed, from day 21 to 42, containing bird vocalizations under either welfare or stress conditions. The results of the experiment generated responses to the tested conditions of gender, genetic strain, and welfare. The proposed model was based on the specific response of mean weights for each situation of stress and well-being. From the results, a model was developed to estimate the welfare condition of broilers from the registered information linked to their vocalization.343413421Baker, T.M., Wilson, D.R., Mennill, D.J., Vocal signals predict attack during aggressive interactions in black-capped chickadees (2012) Animal Behaviour, 84 (4), pp. 965-974. , AmsterdamBroom, D.M., Fraser, A.F., Welfare assessment (2007) Domestic animal behaviour and welfare, pp. 58-69. , BROOM, D. M.FRASER, A. F. Wallingford: CABI PublishingBrumm, H., Schmidt, R., Schrader, L., Noise-dependent vocal plasticity in domestic fowl (2009) Animal Behaviour, 78 (3), pp. 741-746. , LondonCerit, H., Avanus, R., Sex identification in avian species using DNA typing methods (2007) World's Poultry Science Journal, 63 (1), pp. 91-99. , CambridgeChan, W.Y., Cloutier, S., Newberry, R.C., Barking pigs: differences in acoustic morphology predict juvenile responses to alarm calls (2011) Animal Behaviour, 82 (4), pp. 767-774. , AmsterdamCreutzig, F., Benda, J., Wohlgemuth, S., Stumpner, A., Ronacher, B., Herz, A.M., Timescale-invariant pattern recognition by feed forward inhibition and parallel signal processing (2010) Neural Computation, 22 (6), pp. 1493-1510. , BerlimDawkins, M.S., Lee, H.-J., Waitt, C.D., Roberts, S.J., Optical flow patterns in broiler chicken flocks as automated measures of behaviour and gait (2009) Applied Animal Behaviour Science, 119 (3-4), pp. 203-209. , AmsterdamFraser, D., Animal behaviour, animal welfare and the scientific study of affect (2009) Applied Animal Behaviour Science, 118 (3-4), pp. 108-117. , AmsterdamGeberzahn, N., Goymann, W., Muck, C., Ten Cate, C., Females alter their song when challenged in a sex-role reversed bird species (2009) Behavioral Ecology and Sociobiology, 64 (2), pp. 193-204. , SpringerJahns, G., Call recognition to identify cow conditions - A call-recogniser translating calls to text (2008) Computers and Electronics in Agriculture, 62 (1), pp. 54-58. , AmsterdamKokolakis, A., Smith, C.L., Evans, C.S., Aerial alarm calling by male fowl (Gallus gallus) reveals subtle new mechanisms of risk management (2010) Animal Behaviour, 79 (6), pp. 1373-1380. , LondonManteuffel, G., Schön, C., Measuring pig welfare by automatic monitoring of stress calls (2004) Bornier Agratechnische, 29 (1), pp. 110-118. , BerichtMendl, M., Burman, O.H., Parker, R.M.A., Paul, E.S., Cognitive bias as an indicator of animal emotion and welfare: Emerging evidence and underlying mechanisms (2009) Applied Animal Behaviour Science, 118 (3-4), pp. 161-181. , AmsterdamNääs, I.A., Campos, L.S.L., Baracho, M.S., Tolon, Y.B., Uso de redes neurais artificiais na identificação de vocalização de suínos (2008) Engenharia Agrícola, 28 (2), pp. 204-216. , JaboticabalNääs, I.A., Laganá, M., Mollo, M., Canuto, S., Pereira, D.F., Image analysis for assessing broiler breeder behavior response to thermal environment (2012) Engenharia Agrícola, 32 (4), pp. 624-632. , JaboticabalRandall, D., Owren, M.J., Michael, J., Ryan, M.J., What do animal signals mean? (2009) Behaviour, 78 (2), pp. 233-240. , BrillRault, J.-L., Friends with benefits: Social support and its relevance for farm animal welfare (2012) Applied Animal Behaviour Science, 136 (1), pp. 1-14. , AmsterdamShao, B., Xin, H., A real-time computer vision assessment and control of thermal comfort for group-housed pigs (2008) Computers and Electronics in Agriculture, 62 (1), pp. 15-21. , AmsterdamSilva, R.B.T.R., Nääs, I.A., Moura, D.J., Broiler and swine production: animal welfare legislation scenario (2009) Scientia Agricola, 66 (6), pp. 713-720. , PiracicabaSpinka, M., Social dimension of emotions and its implication for animal welfare (2012) Applied Animal Behaviour Science, 138 (3-4), pp. 170-181. , AmsterdamTheodoridis, S., Koutroumbas, K., (2006) Pattern recognition, , 3rd ed. London: Academic PressVolodin, I., Kaiser, M., Matrosova, V., Volodina, E., Klenova, A., Filatova, O., Kholodova, M., The technique of noninvasive distant sexing for four monomorphic dendrocygna whistling duck species by their loud whistles (2009) The International Journal of Animal Sound and its Recording, 18 (3), pp. 277-290. , London