Changes in diet quality may be as important as changes in energy availability in the reproductive success of small mammals. The effect of dietary protein on fitness of females is most likely mediated by changes in yield or composition of milk. Mus musculus was used as a model to test whether dietary protein restriction leads to changes in milk composition. Primiparous mice were fed a 10% or 20% casein-based diet through 2 consecutive reproductive attempts. There was no effect of diet on food consumption or litter size. However, a reduction in dietary protein led to the production of milk with a 12% decrease in protein content and decreased both prenatal and postnatal growth of young. The impact of low levels of dietary protein on milk protein was greater with the increased reproductive demands of concurrent pregnancy and lactation. Significant variation in the protein content of milk was seen among females on the 20% casein-based diet, but not among females on the 10% casein-based diet. Further work is needed to determine the physiological mechanisms that lactating mice might possess to compensate for changes in dietary protein levels, and to determine if the effect of decreased diet quality on the reproductive success of small mammals is similar to the effect of energy availability.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.