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No.57 (2010/12) >

Title :亜熱帯野草地における与那国馬の放牧行動
Title alternative :Grazing behaviour of Yonaguni horse on subtropical native grassland.
Authors :平川, 守彦
平山, 琢二
西山, 絵里
堀江, 優香
Authors alternative :Hirakawa, Morihiko
Hirayama, Takuji
Nishiyama, Eri
Horie, Yuka
Issue Date :Dec-2010
Abstract :Yonaguni horse which is a breed of the Japanese Native horse is grazed all the year round in the Zoysia tenuifolia Wild dominant grassland in Yonaguni island. The behavioral ecology of the Yonaguni horses under the extensive management is almost unknown. Understanding the grazing behaviour of the Yonaguni horse is important in order to raise them properly. This study was investigated from the viewpoint of grazing behaviour of the Yonaguni horse, especially maintenance behaviour. A mare in 1-year old age (150 kg body weight) and a stallion in 4-year old age (184 kg body weight) was grazed in the subtropical native pasture year-long. Observation of the Yonaguni horse was carried out continuously for 24 hours from six a.m. till six a.m. next day in June 28~30th, and October 26~28th on 2005. The observation mainly investigated grazing behaviour, rest behaviour, moving behaviour, grooming behaviour, eliminative behaviour yawing, snorting and gassing between mare and stallion were investigated. Grazing behaviour of 24 hours of Yonaguni mare and stallion were the longest time, and the value ranged from 830 minutes to 848 minutes. Secondly resting behaviour of mare and stallion were longer, the time was range from 415-490 minutes. Lying on side behaviour time of a stallion was longer than a mare. Grooming behaviour time was range from 50 minutes to 71 minutes. Although grazing behaviour of horses was often observed in early morning, daytime, late afternoon and midnight, it was measured markedly less at two o'clock afternoon. Resting behaviour of horses was well observed under the spesific tree in the grassland. Standing rest behaviour of mare and stallion were observed throughout a day, especially at two o'clock in the daytime. And lying on belly behaviour and lying on side behaviour were intensively observed during hours between nighttime and early morning. Grooming behaviour of mare and stallion were seen throughout a day, and defication behaviour of both horses were ranged from 7 times to 46 times.
Type Local :紀要論文
ISSN :0370-4246
Publisher :琉球大学農学部
URI :http://hdl.handle.net/20.500.12000/19161
Citation :琉球大学農学部学術報告 = The Science Bulletin of the Faculty of Agriculture. University of the Ryukyus no.57 p.31 -36
Appears in Collections:No.57 (2010/12)

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