Significance and application of ascorbic acid in poultry

Ascorbic acid (AA) is necessary for various biosyntheses (collagen, carniti n, 1,25-dihydroxyvitamin D, adrenaline etc) as well as for the regulation o f diverse reactions (secretion of corticosterone, regulation of body temper ature, activation of the immune system). In the first 6 weeks after hatchin g the biosynthesis of ascorbic acid is not yet fully developed. In this tim e by supplementation of 100 to 300 mg AA/kg feed an amelioration of growth and of the functional capacity of the immune system is possible. Under heat stress an application of 100 to 200 mg AA/kg feed in chickens an increase in growth and of 100 to 300 mg AA/kg feed in laying hens an augmentation of the laying performance is elicited. In heat stressed cocks an addition of 100 to 200 mg AA/kg augments sperm quality. In vaccinated animals an applic ation of 300 mg AA/kg feed and of 500 mg AA/1 drinking water 5 days before and 5 days after vaccination stimulates antibody formation. In infections a nd in coccidiosis an application of 500 mg AA/kg augments the capacity of t he immune system. An addition of 1000 mg AA/1 drinking water in the time of 24 hours before a transport has an anti-stress-effect and ameliorates carc ass quality.