@article{oai:miyazaki-u.repo.nii.ac.jp:00000354, author = {村上, 昇 and Murakami, Noboru and Khalil, Ashraf M. and Khalil, Ashraf M.}, issue = {6}, journal = {The journal of veterinary medical science}, month = {Jun}, note = {For the past 12 years, a study was conducted in the Misaki area (southern Kyushu Island, Japan) to investigate young males form new harems, how they acquire the mares and the factors affecting the process of new harem formation. Young males formed new harems between the ages of 3.8 and 7.6 yr, and 93% of these new harem groups were formed at the beginning of the breeding season. The most common way (87%) for young males to form a new harem was by acquiring wandering mares which had separated from their groups, whereas 13% stole unstable mares from established bands. The fact that all young males obtained harems the new at an early age, with an average age of 5.2 yr (n=15) could be explained high female biased sex ratio (3:1), and great number of wandering mares per stallion (2.5:1). At the time new harem groups were formed, aggression, fighting or such behavior as active herding or driving mares was not observed among stallions because the "unstable" mares were most likely to be abducted by stallions., 若い御崎雄馬(南九州に生息)が新たなハーレムを形成する上でどの様に雌馬を得るのか,また新たなハーレム形成に関わる要因について過去12年間の行動調査結果をもとに解析した.若い雄馬は3.8歳から7.6歳の間にハーレムを形成し始め,形成時期の98%が繁殖期の開始時であった.若い雄馬が新たなハーレムを形成する上で最も共通して取られた方法は,その87%がグループから離れてさまよっている雌馬を得ることであり,13%が特定の群を出たり入ったりしている雌馬を奪うことであった.すべての若い雄馬が平均5.2歳の若い年齢でハーレムを形成できたと言う事実は,雌馬の高い性比率(3:1)から,あるいは種馬1頭あたりに対し明らかに特定のハーレムに所属しているとは言えない雌馬が多い(25:1)ことから説明できるかもしれない.新しいハーレムを形成する時には,多くの場合,不安定な雌馬を囲い込もことによってハーレムを形成するため,攻撃,闘争,あるいは雌に対するハーディングや追い回しは認められなかった.}, pages = {667--671}, title = {Factors affecting the harem formation process by young Misaki feral stallions}, volume = {61}, year = {1999}, yomi = {ムラカミ, ノボル} }