比成長に関する研究 : 家鶏
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概要
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Detailed phases of physical development in the rooster of white leghorn breed were studied following hatching by means of measuring weight of the whole body, heart, lung, gizzard, testis, liver and spleen, and lengths of the anterior extremities including those of the humerus, ulna, radius, 3rd and 4th metacarpus, the posterior extremities including those of the femur, tibio-tarsus and tarso-metatarsus, intestine and cecum. The problem of relative growth was discussed on the basis of the data obtained in respect to the ratio between the body weight versus the respective weight of the internal organs studied. The results were summarized as follows. 1) The largest growth rate attained in length was that of tibio-tarsus, followed by those of tarso-metatarsus, femur, 3rd and 4th metacarpus, ulna, radius and humerus in this order. The posterior extremities somewhat exceeded the anterior extremities in the growth rate. The largest growth rate attained in weight was that of spleen, followed in the order by teetis, liver, lung and gizzard. These organs, however, had approximately the same weight until toward 10 days after hatching of the animal. 2) As index of the relative growth in weight, ratio between the body weight versus the weight of respective internal organ was expressed by the letter α, and all the values of α for the internal organs except that of the spleen were smaller than 1, suggesting that only the spleen exceeded the body weight in its growth rate.
- 九州歯科学会の論文