The Effects of High Environmental Temperatures and Night Feeding On Performance of Dairy Cows

TL;DRAbstract

The objectives included in this title were studied in two trials. In Trial 1, Dry Matter Intake (DMI) was determined in two groups of cows (3 animals in each group) in which one had free access to water and food (pasture) during 24 hours of day. The second group was kept indoors between the afternoon and morning milkings without food and water. DMI of cows at pasture was determined by the use of Cr2O3 as a marker folowing the technique proposed by Le Du and Penning (1982). Cows with free access to food during 24 hours of the day had a DMI of 12.8 kg/day. In Trial 2 the animals were treated the same way as trial 1 (with or without food at night). In this trial cows were not only on pasture. All animal received 4kg of concentrate per day. Milk yield of the two groups of cows (8 per group) was recorded. Cows with free access to food during the 24 hours of the day produced 20.9 kg of milk per day. The ones without food at night produced 17.6 kg of milk per day. Differences were significant

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