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코발트 첨가 급여가 홀스타인종 젖소 생리 특성에 미치는 영향
박지후,유경림,전은정,김동현,김언태 한국산학기술학회 2023 한국산학기술학회논문지 Vol.24 No.11
This study was conducted to evaluate the effect of feeding additional cobalt (Co) on the physiologic characteristics of Holstein cows. Ten multiparous, lactating Holstein cows (727.2±79.1kg) were randomly assigned to 1 of 2 experimental groups. Five cows were fed 0.1 mg/kg (control group, essential cobalt requirement based on NRC), and the other five cows were fed 0.8 mg/kg (treatment group). Co-glucoheptonate was used for cobalt supplementation. In addition, to examine the effect of environmental temperature, tests were performed twice under a thermoneutral condition (THI 67.2 ± 5.46) and a high-temperature condition (THI 79.09 ± 3.85) over two weeks in May and July 2022. Feeding extra cobalt in the high-temperature environment lowered ruminal temperature (Control: 39.5 9℃ ± 0.11, Treatment: 39.47℃ ± 0.09; p ≤0.001). Furthermore, under both temperature conditions, the control group had a higher rectal temperature than the treatment group (p <0.001). These results could be used as management guides to improve dairy cow stress in high-temperature environments.