In
experiment 1, 18 dry cows held in tie-stalls in a closed aerated barn under heat load conditions
were used to measure the effect of evaporative cooling on the respiratory rate and body
temperature, individual intake of food and water, enzymes expression level in mammary gland
and adipose tissues, and BCS changes until calving. In experiment 2, two groups of 36 dry cows
each, held in a commercial loose housing barn, were used to measure the effects of evaporative
cooling under heat load conditions on calves' birth weight, colostrum quality and quantity, BCS
changes and milk yield during 90 DIM. The non cooled (NC) cows responded to heat load by
increasing their respiratory rate and dailywater intake, while elevating their rectal temperature
by 0.2–0.3 °C as compared with the cooled (C) cows.
Inexperiment 1, 18 dry cows held in tie-stalls in a closed aerated barn under heat load conditionswere used to measure the effect of evaporative cooling on the respiratory rate and bodytemperature, individual intake of food and water, enzymes expression level in mammary glandand adipose tissues, and BCS changes until calving. In experiment 2, two groups of 36 dry cowseach, held in a commercial loose housing barn, were used to measure the effects of evaporativecooling under heat load conditions on calves' birth weight, colostrum quality and quantity, BCSchanges and milk yield during 90 DIM. The non cooled (NC) cows responded to heat load byincreasing their respiratory rate and dailywater intake, while elevating their rectal temperatureby 0.2–0.3 °C as compared with the cooled (C) cows.
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