Abstract
GLYCARBYLAMIDE (4,5-imidazoledicarboxamide, see Cuckler et al., 1958) is a medicant in use for prevention of coccidiosis in chickens. The drug is not recommended for use in adult birds, yet the possibility exists that it may inadvertently be fed to them. This raises the question of its effect on the reproductive performance of adult chickens and the possibility of its deposition in eggs. To obtain these data the following experiments were conducted. PROCEDURE AND METHODSTen White Leghorn hens and one rooster were housed in each of 15 wire-floored cages in a frame building. They were fed a commercial breeder ration for a 10-day period (Control Period), then diets containing glycarbylamide at levels ranging from 0.02 to 0.16% for 21 days (Experimental Period No. 1), and finally refed non-medicated diets for 21 days (Recovery Period). The cages were randomly reassigned to the treatments and the birds again fed the diets containing…
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