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Abstract
Shapasand, M., Alizadeh, A.R., Yousefi, M. and Amini, J. 2010. Performance and physiological responses of dairy cattle to water total dissolved solids (TDS) under heat stress. J. Appl. Anim. Res., 38: 165–168.
To determine the effects of water total dissolved solids containing 3400 ppm (HTDS) or 900 ppm (LTDS) on feed intake, water consumption, milk production and physiological response of heat stressed early lactation cows 10 multiparous Holstein cows (96±28 DIM) were used in a 7 weeks experiment. LTDS increased milk production (P<0.01). Changing water TDS did not affect water consumption, milk protein and lactose as well as rectal temperature and respiration rate. However, heart rate increased in HTDS group (P<0.02). It is concluded that water with TDS up to 900 ppm as an economical and adequate water source can be used for dairy cattle under heat stress while declining heart rate.