All raw data.xlsx

The current study was approved by the Bioethics Committee of the School of Veterinary Medicine and Animal Science - University of São Paulo under the protocol number 1778/2009.Experimental groups were determined according to the duration of calving: 2 h (n = 16), 2-4 h (n = 16) and &gt;4 h (n = 12), and additionally by two sub-groups: no-intervention calving (n = 22) and intervention calving (n = 22). Neonatal calves were evaluated for heart and respiratory rate at birth, 5 min, every 10 min until 90 min. Arterial acid-base balance was determined immediately after calving and thoracic radiographs were made at 10 min of life. <br>