Abstract
This study was conducted on 44 newborn Holstein Friesian calves raised in a private farm in Hatay province, Turkey. The calves were divided into two groups; the first group (control group) was fed only with milk replacer and the second group was fed with milk replacer added 893 mg oregano oil (oregano oil group) from the fourth day after calving. The amount of milk replacer offered to the calves was 10% of their weekly live weights. The calves were weaned when they consumed 800 g concentrate feed daily for three consecutive days. Weaning age and daily live weight gains for control and oregano oil group calves were found as 68.6 ± 4.45, 67.7 ± 4.62 days and 0.300 ± 0.09, 0.400 ± 0.011 kg, respectively. The mean consumption of milk replacer, hay and concentrate feed of calves for the control and orageno oil calves were found as 327.7 ± 42.17, 331.0 ± 49.40 liters; 13.25 ± 3.025, 15.23 ± 3.682 kg and 19.97 ± 4.186, 22.37 ± 5.709 kg, respectively. The average initial hay, and concentrate feed consuming ages and diarrhea days for the control and oregano oil groups were determined as 10.6 ± 0.29, 9.5 ± 0.28 and 3.1 ± 0.111, 1.9 ± 0.073 days. The initial hay and concentrate feed consuming ages were the same in both groups. According to the results of the study, more research is needed to evaluate the optimal dosing of oregano oil.
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