title: Association of plasma 5'-nucleotidase and alkaline phosphatase with production traits in chickens: effects of age and housing systems.
abstract: The housing system, age of pullets and their interaction had a significant effect on plasma 5'-nucleotidase and alkaline phosphatase activities. Activities were higher in birds in cages than in those on the floor, reflecting perhaps the stress of caging. Activities increased with age. Activities were higher in pullets selected for higher production. The type of housing had no effect on egg production, but age at first egg, egg weight and 40-week body weight were found to be affected significantly.
mesh_terms: D015720:5'-Nucleotidase; D000375:Aging; D000469:Alkaline Phosphatase / Q000097:blood*; D000818:Animals; D001835:Body Weight; D002645:Chickens / Q000502:physiology*; D005260:Female; D006799:Housing, Animal; D009708:Nucleotidases / Q000097:blood*; D010058:Oviposition
chemical_list: D009708:Nucleotidases; D000469:Alkaline Phosphatase; D015720:5'-Nucleotidase