@conference {40790,
	title = {Heart rate response as a measure of stress and welfare in cattle},
	booktitle = {Proceedings of the New Zealand Society of Animal Production},
	volume = {56},
	year = {1996},
	month = {Jan},
	pages = {103-106},
	publisher = {New Zealand Society of Animal Production},
	organization = {New Zealand Society of Animal Production},
	abstract = {Problems exist in welfare quantification of stressors due to variation in  animal responses. A theory, based on adaptation to repeated exposure of a  stressor, is proposed for objective assessment of welfare. Cattle of three ages were exposed repeatedly to transport, or aspects of  transport. Cattle aged 6 weeks showed a declining tachycardic response to  repeated transport (p<0.05). Cattle aged 3-6 months showed no consistent  pattern of heart rate response to transport, although bradycardia was  observed in some animals. Bradycardia was also observed in 2 year old  bulls, the incidence of which declined with repeat exposure to trailer  loading. Heart rate decreased over transport in bulls unfamiliar with trailer  loading (p<0.05), while no change in heart rate was seen in bulls familiar  with a trailer.},
	issn = {1176-5283},
	author = {Jacobson LH and Cook CJ}
}
