馬の大きさと役力との関係-4-
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概要
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1. The authors have studied on the relation between the body-size and the work power in the horse.This report concerns with the connection between the body-weight and the work power.The test animals were adult horses and ponies of such breeds as Korean, Hokkaido and half-bred ones, and amounted to 21 heads, their body-weight being ranged from 185 to 622 kg. Some practical work powers were compared with the maximum pulling power of the animals in elation to their body-weight.2. When the animals were made to work in pulling carts or wagons whose mean draft resistance was about one tenth of body-weight, there was no significant cerrelation between the walking speed and the body-weight.When they ploughed paddy-field with a Japanese plough, significant correlation was recognized between above two factors, i.e., the lighter the body-weight was, the slower the speed was.In riding test in repeated walking for 10 minutes followed by trotting for 5 minutes, the Korean ponies of ca. 200kg in body-weight were remarkably slower in speed than the heavier horses.It may be concluded that the speed of the horses has no remarkable correlation to the body-weight, so far as the work is adequate for the body-weight.The speed is influenced by the length of stride and the frequency of stride per minute. The frequency of stride per minute of horses of heavy body-weights seemed to be less, while the length of stride had a tendency to be larger than each of horses of light body ones.3. The ploughing of paddy-field with the Japanese plough was too heavy a work for the Korean pony whose body-weight was about 200kg. The Hokkaido pony, about 300kg in body-weight, , seemed to be the smallest horse which could pull easily the Japanese plough in the paddy-field.The correlation coefficient between the area to be ploughed and the body-weight of the horse was found 'to be +0.92. And the heavier horses showed the tendency of ploughing more deeply than the lighter ones.4. The maximum weight of load to be packed as well as to be pulled by horses had a close relation to the body-weight of the animals, the correlation coefficient being +0.91 and +0.98 respectively.Although the maximum pulling power of horses was almost proportional to their body-weight, the maximum packing, ability was out of the proportion.The light horses could pack heavy loads unproportional to their body-weight.It seemed that the pulling power was different from the packing ability in regard to the body-weight.The regression coefficient in percentage of the area surrounded by four hoofs of the horse was quite similar to that of the maximum load weight to be packed in relation to the body-weight.From the above fact it may be concluded that the area surrounded by four hoofs has some relation to the packing ability. The authors presume that the load weight per unit of the area is nearly constant, i.e., 3850g per 100sq.cm.
- 社団法人 日本畜産学会の論文