Abstract: Described herein is a method for identifying a farm animal having an impairment of regulative capacity in response to metabolic stress, the method including: a) assessing the value of the nonlinear domain heart rate variability component LMAX of a farm animal based on a heart beat interval data set obtained for the farm animal; and b) comparing the value of LMAX assessed according to (a) with a species specific threshold of LMAX, whereby a farm animal having an impairment of regulative capacity will be identified.

Abstract: Described herein is a method for predicting the methane (CH4) emission of a dairy cow, the method including: a) determining the total amount of milk of a dairy cow per one day; b) determining the energy corrected milk value (ECM) of the milk of the dairy cow of the same day); c) determining the percentage amount of saturated fatty acids (SFAs) of the total milk fat of the dairy cow of the same day) and the percentage amount of stearic acid (C18:0) of the total milk fat of the dairy cow of the same day; d) calculating the daily amount of methane emitted by the dairy cow based on the ECM as determined according to b), the percentage amount of SFAs of the total milk fat as determined according to c), and the percentage amount of C18:0 of the total milk fat as determined according to c).