Inclusion of industrial egg residue in the feed of laying hens to replace limestone: digestibility, productive performance and egg quality

Our objective was to determine whether inclusion of industrial egg residue (IER) in the diets laying hens would replace calcitic limestone without interfering with productive efficiency, quality or digestibility. In a first study (Experiment I), we used 30% IER and found that apparent digestibility coefficients were 51.6%, 42.8%, 51.6% 17.8% for dry matter, crude protein, calcium phosphorus, respectively. second II), compared control diet containing four increasing levels IER, proportions 25%, 50%, 75% 100%. During cycle (day 1–28), there no difference between treatments terms performance quality. production 29–56), observed less food consumption by birds ingested highest (100% substitution) than controls. third 57–84), negatively affected performance, particularly lower numbers, mass higher feed conversion. Finally, during cycle, chickens broke their eggs shortly after laying. We conclude use cannot commercial hens, because it reduces affects