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Effects of housing systems on physiological responses of newborn Holstein calves

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1009452.(doi:10.13031/2013.29911)
Authors:   Soraia Vanessa Matarazzo, Irineu Arcaro Júnior, Lívia Castelani, Sérgio de A Fernandes
Keywords:   newborn, physiology, housing systems

The objective of this work was to evaluate the effects of housing system on the physiological responses of newborn Holstein calves. The experiment was carried out during the summer of 2006. Twenty female Holstein calves, 1-month old and 46.27.0 kg of body weight were randomly assigned to the treatment groups. Treatments were: individual shelter covered with recycled tiles maintained on pasture or individual cage maintained inside the barn. The calves were fed milk (4L/day) during all experimental period. Also, were offered Tifton hay and a started concentrate ad libitum. Physiological data, as respiratory frequency (RF), rectal temperature (RT) and skin temperature (ST), were taken each 2-hour from 08:00 a.m. to 04:00 p.m. Dry bulb temperature (DBT), air relative humidity (RH) and black globe temperature (BGT) inside and outside of facilities were measured every 15 minutes through a period of 24 hours. Rectal temperature did not differ (P>0.05) among animals from different treatments. The respiratory frequency and skin temperature were higher during the afternoon in calves kept in individual cage.

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