Author Information

Y. Zeng
A. M. Parkhurst
J. Pantoja

Abstract

Body temperature is an important measure for monitoring the health status of cows. The objective of this study is to (1) determine if a cow’s body temperature is related to ambient temperature, relative humidity, and/or temperature humidity index (THI); (2) look for signs of heat stress. The data are collected at five minute intervals during the summer months (December through February) in Puerto Rico. Regression analysis and a succession of time series analyses are conducted in time domains. Nonparametric spectral estimation and cross-spectra analysis are also performed in the frequency domain. A search for indications of heat stress is performed by characterizing the relationship between body temperature and environmental factors. Detailed approaches of regression with autocorrelated errors and transfer function model in time domain are presented, along with the comparison between two models.

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Apr 19th, 3:30 PM

USING TIME SERIES TO STUDY EFFECT OF AIR TEMPERATURE ON BODY TEMPERATURE OF COWS IN PUERTO RICO

Body temperature is an important measure for monitoring the health status of cows. The objective of this study is to (1) determine if a cow’s body temperature is related to ambient temperature, relative humidity, and/or temperature humidity index (THI); (2) look for signs of heat stress. The data are collected at five minute intervals during the summer months (December through February) in Puerto Rico. Regression analysis and a succession of time series analyses are conducted in time domains. Nonparametric spectral estimation and cross-spectra analysis are also performed in the frequency domain. A search for indications of heat stress is performed by characterizing the relationship between body temperature and environmental factors. Detailed approaches of regression with autocorrelated errors and transfer function model in time domain are presented, along with the comparison between two models.