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Influence of yogurt and acidophilus yogurt on serum cholesterol levels in mice.

The effects of yogurt and acidophilus yogurt on the weight gain, serum cholesterol, high density lipoprotein cholesterol, low density lipoprotein cholesterol, triglycerides, and the numbers of fecal lactobacilli and coliforms were investigated in mice assigned to three dietary treatments for 56 d: 1) commercial rodent chow and water (control), 2) commercial rodent chow and yogurt made from milk inoculated with a 3% (vol/vol) liquid culture of Streptococcus thermophilus and Lactobacillus delbrueckii ssp. bulgaricus (yogurt), and 3) commercial rodent chow plus yogurt made from milk inoculated with a 0.01% (wt/vol) freeze-dried culture of Streptococcus thermophilus plus Lactobacillus acidophilus. The weight gains of mice receiving yogurt or acidophilus yogurt were higher than those of the mice in the control group. The mean values for serum cholesterol concentrations and LDL cholesterol concentrations were significantly decreased when acidophilus yogurt was fed on d 28 and 56. High density lipoprotein cholesterol and triglycerides were not affected by yogurt or acidophilus yogurt. The highest number of fecal lactobacilli was found in mice receiving acidophilus yogurt, and the number of fecal coliforms of that group was also lower than in the other two groups.

Animals

Effects of chronic high-level manganese exposure on male behavior in the Japanese quail (Coturnix coturnix japonica).

Male Japanese quail were chronically exposed to 5000 ppm manganese (Mn) as particulate manganese oxide (Mn3O4) in their diet from hatching to 75 days of age. No decrements in growth or in other indices of general toxicity were noted. There were significant (P less than .05) age-related increases in general locomotor activity in the control group, although no significant (.05 less than P less than .10) increases were seen in the Mn-treated group. Both control and Mn-treated groups had significant (P less than .05) age-related increases in aggressive behavior with an overall significant (P less than .05) treatment-related depression. Serum testosterone concentration was only slightly depressed (.05 less than P less than .01) in the 75 day-old, Mn-treated quail. Both the control and Mn-treated quail had higher liver Mn concentrations than previously reported in rodents. Both control and Mn-exposed quail accumulated 5 to 10 times more Mn in their livers than similarly treated rodents. This study indicated that the Japanese quail was less sensitive to particulate Mn3O4 exposure than rodents treated comparably.

Aggression