Effects of Yogurt and Freeze‐Dried Yogurt on Growth Stimulation of Rats

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Abstract
Growth was assessed in rats fed diets of freeze‐dried (FD) and liquid milk and yogurt. Microbial growth in liquid milk under feeding conditions lowered pH to 4.5 and caused coagulation; thus, accuracy of comparing liquid diets is questionable. Freeze‐drying eliminated such problems but did not diminish the superior stimulation of growth in rats by yogurt. Weight gains of rats on yogurt were 24.3% higher then for milk when fed as liquid and 24.6% higher when fed FD. Feed efficiencies for yogurt diets were significantly higher than were efficiencies for milk diets. Lactase activity of FD yogurts declined less than 5% during 24 months storage at 10°C.