The growtgh and the food and water consumption of the resting or exercising albino rat on diets containing various amounts of fat and a reduced quantity of thiamine. II. Summer experiments

Beznák, Aladár and Beznák, Margit and Hajdu, István (1948) The growtgh and the food and water consumption of the resting or exercising albino rat on diets containing various amounts of fat and a reduced quantity of thiamine. II. Summer experiments. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 18. pp. 353-368. ISSN 0365-3005

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Abstract

1. The growth, food and water consumption of albino rats in rest, forced exercise and rest following exercise, on diets poor in vitamin Bi and containing respectively 3 and 32% fat, were established during the summer, and compared with earlier spring results. 2. In rest throughout the span of growth between 100 and 300 g, during summer, growth is slower on the 3% than on the 32% diet, though it is greater in both groups than it is in the corresponding spring groups. The summer increase is considerably greater in the 32% than in the 3% group. 3. In the summer, during forced exercise, both groups lose weight, but the 32% more than the 3% group. In the spring, exercise restored and maintained growth which had been stunted during the pre-exercise rest on the 3% diet. The loss of weight in the 32% group during summer is considerably greater than in the spring. 4. Food and water consumption during the summer - in animals resting throughout the entire growth span - is inversely proportional to the fat content of the diet. This inverse proportion was seen in the spring experiments also. Summer animals, however, consume more food in all groups than the spring ones do and this increase in the summer consumption is also inversely proportional to the fat content of the diet. In summer, during exercise in both 3% and 32% groups, food and water consumption decrease. The decrease is greater in the latter than in the former group. In the spring there was an increase in the food consumption of the 3% group. In the 32% group during exercise, both in spring and in summer, food and water consumption decrease at the beginning of exercise. This is followed by a recovery in both cases in the last 2/3rds of the exercise period. 5. When, during summer, after 44 days of pre-exercise rest, the fat content of the diet for the exercise period is reversed from 3% to 32% and vice versa, growth, food and water consumption behave according to the fat content of the diet consumed during exercise. The effect of the increase in the fat content is instantaneous, that of the decrease has a few days’ lag. In the animals whose resting 32% diet was exchanged for the 3%, increase in the water consumption, from the last 2/3rds of the exercise period onwards is greater than in the other groups. 6. At the end of the summer, parallel with a great mortality, there is a long and great spontaneous loss in weight, in all animals except the ones resting on the 3% diet throught the summer. In the summer animals mortality also occurs during exercise. Mortality and loss of weight increase with the fat content and exercise. These phenomena were completely absent in the spring animals. 7. It is suggested that the effect of fat and exercise on the growth, food and water consumption is essentially the same in summer and in spring, but in the summer all effects of fat are greater.

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