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RISS 인기검색어
- 검색키워드
- 저자 : Nashiki, M. (검색결과 3 건)
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Urinary Catecholamine and Cortisol Responses of Japanese Shorthorn Cows to Social Isolation
Higashiyama, Yumi,Nashiki, M.,Narita, H. Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.10
This study was performed to investigate the use of urinary catecholamines to monitor changes in the activity of the sympathetic nervous system and to determine the relationship of urinary cortisol and catecholamines in Japanese Shorthorn cows in response to social isolation. One cow was isolated from its group, which consisted of 14 cows (457 to 756 kg BW, 2 to 12 years old), for three days. The isolated cow was in contact with the other cows visually only at meal times. This isolation was repeated for 6 cows. Spontaneously voided urine samples were collected from the experimental animals once a day, before the treatment and on days 1, 2, and 3. Urinary cortisol and adrenaline levels were significantly increased compared with pre-isolation levels on the first day, and then declined to the basal levels during the next two days. Urinary noradrenaline levels changed in the same way as cortisol and adrenaline levels, but the difference was not significant. Urinary cortisol levels tended to be correlated with those of urinary adrenaline, but not noradrenaline. This study suggests that the urinary adrenaline levels can be a non-invasive indicator of stress and that the change of urinary adrenaline is similar to that of urinary cortisol.
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Urinary Cortisol Levels in Japanese Shorthorn Cattle before and after the Start of a Grazing Season
Higashiyama, Y.,Narita, H.,Nashiki, M.,Higashiyama, M.,Kanno, T. Asian Australasian Association of Animal Productio 2005 Animal Bioscience Vol.18 No.10
We conducted two experiments to assess the effect of transfer from housing to grazing on stress hormone secretion in cattle using urine samples. In a preliminary experiment, urine samples were collected following an adrenocorticotrophic hormone (ACTH) challenge, and cortisol levels in urine were compared with the levels in plasma. In a second experiment, urinary cortisol was measured before and after the start of a grazing season in 6 Japanese Shorthorn cows, all of which had experienced grazing before. In experiment 1, urinary cortisol showed a pattern of changes similar to that of plasma with a 0.5-h temporal lag time, and the peak levels were 4 to 10 times higher than the basal levels. In experiment 2, the urinary cortisol levels in cows did not change after the cows were let out to pasture, with no decreases in body weight. This study suggests that the transfer from housing to grazing did not affect physiological responses to cause high excretion of urinary cortisol in grazing-experienced cattle using a non-invasive sampling method.
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Eiki Fukuda,Tetsuo Suyama,Takanori Yagi,Mamoru Nashiki 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
We investigated the differences in survival rates and height growth among 10 sprouting tree species under cattle grazing conditions in a clearcut area of a secondary forest, as well as the relationship between survival and growth and the species' leaf tannin contents. A clearcut area of a deciduous broad-leaved secondary forest was grazed by two breeding cattle from 1990 until 2001. The height and viability of marked sprouting trees in the area were monitored annually before the initial spring grazing period for 12 years. The tannin contents in leaves were measured from 1996 until 1998. The target tree species differed greatly in the patterns of survival and height growth and were classified into four categories based on these patterns. Similarly, tannin contents in leaves varied widely (1.3% to 11.6%) among the species. Survival rates of the target species in 2001 correlated significantly with the tannin contents in leaves. Our findings indicate that tannin content in leaves is an influential factor affecting the survival and growth of sprouting trees under cattle grazing conditions.
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