Conventional production of meat-type chickens in Sweden is characterized by high bio-security and low use of antibiotics. Still, there are indications of variations in day old chick quality causing economic losses in terms of variations in growth and increased condemnation at slaughter. The aim of this project is to investigate effects on gut development, gut microflora and immune response of adapted management and feeding of the newly hatched chicken. The hypothesis is that prebiotic effects of filamentous fungi and macro algae feed additive will promote development of a more robust chicken, with an enhanced positive effect when feed and water are available already during hatching. Effects of a probiotic supplement in water to newly hatched chickens are also studied. In addition, the project considers pros and cons of on farm hatching and hatchers providing feed and water, in preconditions prevailing in Sweden.