INFLUENCE OF DIETARY OSTEOLATHYROGENS ON THE EGGSHELL QUALITY OF LAYING HENS

1. Laying hens were fed osteolathyrogens, either semicarbazide hydroch loride at 0.3 or 0.4 g/kg or beta-aminopropionitrile fumarate at 0.5 o r 0.6 g/kg diet to examine their effects on eggshell quality. 2. Shell quality characteristics considered for evaluation were shell surface area, shell thickness, shell weight, percentage shell, shape index and the specific gravity of eggs. Measurement of shell quality traits rev ealed that the hens fed osteolathyrogens laid eggs with significantly lower specific gravities and proportion of shell by weight. These diff erences were not explained by differences in shell thickness or weight or the shape index of eggs. 3. It was concluded that osteolathyrogens cause hens to lay eggs with poor shell quality and such eggs are weak and fragile.