Manteuffel G, Puppe B, Peter C S. Vocalization of farm animals as a measure of welfare[J]. Applied Animal Behaviour Science, 2004, 88(1). 163-182.
[2]
Van H A, Berckmans D. Assessing the sound of cough towards vocality[J]. Medical Engineering & Physics, 2002, 24(7) : 535- 540.
[3]
Yeon S C, Jeon J H, Houpt K A, et al. Acoustic features of vocalizations of Korean native cows (Bos taurus coreanea) in two different eonditions[J]. Applied Animal Behaviour Science, 2006, 101 ( 1 - 2) : 1 - 9.
[4]
Evans C S, Evans L. Chicken food calls are functionally referential[J]. Animal Behaviour, 1999, 58(2): 307-319.
[5]
Zimmerman P H, Koene P. The effect of frustrative nonreward on vocalizations and behaviour in the laying hen, Callus gallus domesticus[J]. Behavioural Processes, 1998, 44(1): 73-79.
[6]
Jahns G, Kowalczyk W, Walter K. Sound analysis to recognize different animals [C] // Mathematical and Control Applications in Agriculture and Horticulture: Procaedings of the 3rd IFAC Workshop, Hannover, Germany, 1997.
[7]
Mair J, Marx G, Mennicken L. Development of multi parametric sound analysis parameters as welfare indicator in chicken flocks[C]//Noise and Vibration Engineering: Proceedings of ISMA 25, Leuven, Belgium: Katholieke Universiteit Leuven, 2000 : 1 523-1 527.