THE ENDOGENOUS AMINO ACID EXCRETION OBTAINED IN GRO\VING BROILER AND ADULT COCIGZRELS

Abstract

Two trials were conducted to measure the uric acid excretion (UAE), the endogenous fecal nitrogen (EFN), in the endogenous amino acid (EAA) excretions in growing broilers and adult cockerels. Twenty-four broilers (50 % of each sex) were used both at 3 and 6 wk of age in the first trials and eighteen adult cockerels in the second one. In the second experiment, the influence of N-tree diet intake on UAE, EFN, and EAA excretions was also investigated. The birds were fasted for 24-h and then forced-fed with moistened N-fiee diet (dict/water: 50/SO). The N-tree diet was composed of 48.25 % starch, 48.25 % glucose, 3.50 % mineral-vitamin premix. Excreta in both groups were collected during 24-h subsequent period after force-feeding. For growing broilers, the UAE, EFN, and EAA was significant (P<.05) lower in younger birds (at 3 wk of age) than in older ones (at 6 wk of age). In both ages of broilers, sex had no effect (P>.05), on UAE and EFN; however for EAA values there are some significant differences. In cockerel experiment, the UAE was significantly (P<.05) higher in fasted birds than in cockerels fed a N-free diet. On the other hand, the N-free diet increased the EFN and EAA excretions in adult cockerels.