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Growth and Food Preference of Rats Fed a Lactose-Dried Milk Ration Containing Butter Fat or Corn Oil^{1, 2,}

One Figure

Kansas Agricultural Experiment Station, Manhattan

1. All groups of rats fed ad libitum on butter fat rations made greater average gains in weight than those fed corn oil rations. The results were significant in four of the seven experiments.

2. All groups of rats fed butter fat showed a greater average consumption of the ration than did those fed corn oil. The results were significant in three of the seven experiments. The gain in weight made on either ration was related to the quantity of food the rat consumed.

3. The average efficiency of conversion of the food to body tissue over a 6-week period was similar for both the butter fat ration and the corn oil ration.

4. When given a choice, hungry rats previously fed corn oil exhibit no preference for the butter fat ration over the corn oil ration. The results in these experiments were not found to be consistent for the rats fed the butter fat ration.

5. Rations of the same composition, made of ingredients from different sources, did not cause the same growth response when used in simultaneous feeding experiments.

² Supported in part by a grant from the American Dairy Association.

Manuscript received 8 October 1945.