Contributions to the Energetics of Animal Growth
115
One may reach this claim by introducing a third term into the equation
describing the living mass produced by the energetic output of anabolism.
In this case, we would have mass values on both sides of the equation. From
a mathematical point of view this third term would have the power (1 - IX).
Introducing this third term into the PUTTER-BERTALANFFy-equation we
would get in the non-growing animal.
c·w(1-a) . a·w U "" k.w
(conversion) (anab.) (catab.)
(4)
This equation is only valuable and applicable for a nongrowing animal.My theoretical considerations had reached this point. Somewhat later
and much by chance, the results of Dr. PAN DIAN from the University of
Madras (India) came to my hands, giving me the possibility to test my
theory.
The Results of Dr. PANDIAN
PANDIAN [10] measured the food intake, the food consumption and the
food conversion in two Indian fishes. The regular growth of fishes, which
mathematically shows no breaks in the growth curves, seems to be a very
appropriate example for the study of growth phenomena. PANDIAN determined all values in calories and therefore delivered comparable values for
all measurements. Measuring the metabolism of small and large fishes, his
results allow an allometric evaluation. It is also important that he related
all parameters of the allometric formula to body weight. The factors and
exponents of the allometric formula are given in Table 1.
Table 1. Allometric evalltation of the results of PANDIAN [10] on food-consumption,
food-absorption, conmmption and conversion in two Indian fishes
Food-consumption
Food-absorption
Consumption
Conversion
Megalops
Exponent
Factor
0.71
0.70
0.77 (ex)
0.54 (y)
0.085
0.081
0.045
0.040
Ophiocephalus
Exponent
Factor
0.76
0.77
0.88 (ex)
0.55 (y)
0.057
0.050
0.025
0.028
In this table "food consumption" means the total food the fish has
eaten. The "food absorption" is the food consumed minus the faeces
cast and therefore represents the amount of food really taken up. "Conversion" represents the gain in weight measured in calories. "Food consumption" represents the difference between the food absorbed and the
food converted. It therefore exhibits the matter which has not been used
for the gain in weight and hence must have been catabolized by oxydation.
8*
115
One may reach this claim by introducing a third term into the equation
describing the living mass produced by the energetic output of anabolism.
In this case, we would have mass values on both sides of the equation. From
a mathematical point of view this third term would have the power (1 - IX).
Introducing this third term into the PUTTER-BERTALANFFy-equation we
would get in the non-growing animal.
c·w(1-a) . a·w U "" k.w
(conversion) (anab.) (catab.)
(4)
This equation is only valuable and applicable for a nongrowing animal.My theoretical considerations had reached this point. Somewhat later
and much by chance, the results of Dr. PAN DIAN from the University of
Madras (India) came to my hands, giving me the possibility to test my
theory.
The Results of Dr. PANDIAN
PANDIAN [10] measured the food intake, the food consumption and the
food conversion in two Indian fishes. The regular growth of fishes, which
mathematically shows no breaks in the growth curves, seems to be a very
appropriate example for the study of growth phenomena. PANDIAN determined all values in calories and therefore delivered comparable values for
all measurements. Measuring the metabolism of small and large fishes, his
results allow an allometric evaluation. It is also important that he related
all parameters of the allometric formula to body weight. The factors and
exponents of the allometric formula are given in Table 1.
Table 1. Allometric evalltation of the results of PANDIAN [10] on food-consumption,
food-absorption, conmmption and conversion in two Indian fishes
Food-consumption
Food-absorption
Consumption
Conversion
Megalops
Exponent
Factor
0.71
0.70
0.77 (ex)
0.54 (y)
0.085
0.081
0.045
0.040
Ophiocephalus
Exponent
Factor
0.76
0.77
0.88 (ex)
0.55 (y)
0.057
0.050
0.025
0.028
In this table "food consumption" means the total food the fish has
eaten. The "food absorption" is the food consumed minus the faeces
cast and therefore represents the amount of food really taken up. "Conversion" represents the gain in weight measured in calories. "Food consumption" represents the difference between the food absorbed and the
food converted. It therefore exhibits the matter which has not been used
for the gain in weight and hence must have been catabolized by oxydation.
8*