THE INFLUENCE OF PREVIOUS FEEDING ON THE NITROGEN EXCRETION OF FASTING BIRDS

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Abstract
Twenty-seven cocks were divided into 5 groups, each fed one of the following diets: (1) normal, (2) high-protein (milk), (3) low-protein (milk), (4) high-protein (meat), or (5) low-protein (meat). The birds were force-fed for 5 days at fixed levels of N intake and then subjected to an 8 day fast. This was followed by a 5 day feeding period. The daily N excretion was measured during the 3 periods. No peak in N elimination occurred during the fast. The influence of previous feeding disappeared on the 3rd day of the fast and from the 3rd to the 8th day of fast the daily excretion of N was practically constant. The source of protein fed during the preliminary period had no influence on the quantity of N excreted during the fast. The birds receiving the normal diet showed the greatest N retention and the largest gain in wt. during the final feeding period.

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