Selection for 42-Day Weight in Mice On High And Low Fiber Diets.
Selection for 42-Day Weight in Mice On High And Low Fiber Diets.
Rodriguez, Rafael Efren, 1939-
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Regression of weaning weight on number weaned, both linear and quadratic, was highly significant (P < .01) .
These significant regressions (-1.931.27 and .07±.02) indi- cate a dependency of weaning weight on ;the amount of milk available to the pup. Significant dam effects which re- mained with number weaned in the model suggest significant individual differences between dams for milk production.
Effects for sex and sex x diet interaction were sig- nificant (P < .01). Male pups were heavier than female pups across diets; but within diets, male pups were heavier in diet 1 while females were slightly heavier in diet 2, 57 resulting in the significant interaction, Table 19. This interaction apparently was due to the inability of the sexes to express their differences in growth potential on the low plane of nutrition provided by diet 2. In diet 1, energy intake was higher and differences in growth potential were expressed. This diet induces sexual dimorphism is common (Korkman, 19 57; Butler and Metrakos, 1950) in mice selection experiments under two planes of nutrition.
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