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Journal of Dairy Science
Her, E., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Wolfenson, D., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Flamenbaum, I., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Folman, Y., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Kaim, M., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Berman, A., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Effect of cooling on body temperature, milk production, estrous behavior, and reproductive performance was examined in 66 estrous-synchronized, Israeli-Holstein dairy cows. Cooling was by an automated system, which actuated sprinkling (30 s) followed by forced ventilation (4.5 min) for 30-min periods. Cows were cooled 9 times/d between 0500 and 2100 h over 10 d, starting 1 d before expected estrus until d 8 post estrus. Cooling reduced typical diurnal rise of body temperature in summer heat-stressed cows by .5 to .9 degrees C, and body temperature was maintained close to normothermic temperature (38.6 degrees C). Milk production of cooled cows was 2.6 kg/d (+8%) above control at end of the cooling period. More cooled cows than noncooled exhibited standing estrous behavior; in noncooled cows, silent ovulations or anestrus were more frequent. Conception rate of cooled cows did not differ from control, suggesting need for a longer than a 10-d cooling period for improvement of fertility. The cooling system has potential to alleviate heat stress in dairy cows and to improve their thermal balance, productive, and reproductive performances.
פותח על ידי קלירמאש פתרונות בע"מ -
הספר "אוצר וולקני"
אודות
תנאי שימוש
Thermal, productive, and reproductive responses of high yielding cows exposed to short-term cooling in summer.
71
Her, E., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Wolfenson, D., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Flamenbaum, I., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Folman, Y., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Kaim, M., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Berman, A., Department of Animal Science, Faculty of Agriculture, Hebrew University, Rehovot, Israel.
Thermal, productive, and reproductive responses of high yielding cows exposed to short-term cooling in summer.
Effect of cooling on body temperature, milk production, estrous behavior, and reproductive performance was examined in 66 estrous-synchronized, Israeli-Holstein dairy cows. Cooling was by an automated system, which actuated sprinkling (30 s) followed by forced ventilation (4.5 min) for 30-min periods. Cows were cooled 9 times/d between 0500 and 2100 h over 10 d, starting 1 d before expected estrus until d 8 post estrus. Cooling reduced typical diurnal rise of body temperature in summer heat-stressed cows by .5 to .9 degrees C, and body temperature was maintained close to normothermic temperature (38.6 degrees C). Milk production of cooled cows was 2.6 kg/d (+8%) above control at end of the cooling period. More cooled cows than noncooled exhibited standing estrous behavior; in noncooled cows, silent ovulations or anestrus were more frequent. Conception rate of cooled cows did not differ from control, suggesting need for a longer than a 10-d cooling period for improvement of fertility. The cooling system has potential to alleviate heat stress in dairy cows and to improve their thermal balance, productive, and reproductive performances.
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