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KMID : 0351619680090010135
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Kyungpook Medical Journal
1968 Volume.9 No. 1 p.135 ~ p.149
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On the Growth and Relative Growth of Various Organs in the Chick Embryos Treated with Testosterone
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李隆昌/Lee, Yung Chang
陳丁煥/朴商斌/朴元學/Jin, Jung Hwan/Park, Sang Bin/Park, Won Hark
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Abstract
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This study is to analyze the effects of testostenone on the weight gains of body weight and various organs of chick embroys, out of which growth and relative growth formula have been derived. On the 8th and 12th days of incubation, 0.5mg and 7.5mg of testosterone were injected into the chorio-allantoic membrane of each incubated egg of two groups, and each main group were devided into three more small groups such as control, 0.5mg injected group and 7.5mg injected group. Between the 12th and 18th of incubation day, a daily total of 10 treated eggs were brocken for weighing the body weights of chick embryos and six organs, name]y, brain, eyeball, lung, liver, heart and kidney.
The authors used Dr. Joo´s formula to analyze the growth and relative growth in this study.
The results are as follows :
1) Growth rate ; In the 8th day group, it was observed to be increased in body weight through out three groups-control, 0.5mg group and 7.5mg group, in 0.5mg groups and 7. 5mg groups of brain, lung and liver, in 0.5mg group of heart and in 7.5mg group of kidney. The others were decreased. In the 12th day group, the increase in growth rate was observed in followings ; every group of body weight, lung and liver, control group and 7.5mg group of kidney. The others were decreased.
2) Specific growth rate ; The increase was observed onlo in the drug injected groups of lung in 12th day group and the others were decreased. Among the others, 7.5mg groups of lung in 8th day group and body weight in 12th group were increased until 13th day of incubation and thereafter they were decreased. And control of lung in 12th day group was increased until 16th day of incubation and was decreased thereafter.
3) Growth gradient : The growth centers appeared as follows.
a) In the 8th day group ; most of them were on 12th day of incubation, except 0.5mg group of brain which was on between 16th and 17th, control of eyeball on 15th, 0.5mg group of eyeball on 13th, 0.5mg groups of lung and liver on 18th, and 7.5mg group of lung on between 17th and 18th day.
b) In the 12th day group ; most of them were found to be on 12th day of incubation except control and 0.5mg groups of eyeball on 13th, liver and control group of kidney on 18th day.
4) Coefficient of relative growth ; The coefficients of relative growth to body weight were as follows :
a) In the 8th day group ; 7.5mg group of lung, liver and 0.5mg group of kidney were of positive allometry ; the others showed negative.
b) In the 12th day group ; 0.5mg group of brain and every group of liver were of positive allometry and the others were negative.
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