title: Calcium and phosphorus utilisation in chickens fed on diets high in N-alkane-grown yeast.
abstract: Interactions between calcium (Ca) and phosphorus (P) were studied in young chickens fed on diets high in n-alkane-grown yeast and in chicks fed on control soya-fishmeal diets for 14 d. Additions of inorganic Ca to diets containing 300 g yeast/kg caused increases in body-weight gain, gain:food ratio and bone mineralisation up to a total dietary concentration of 13.9 g Ca/kg. At all additions of Ca, bone mineralisation was inferior in yeast-fed chicks compared with control chicks. Supplementation of high Ca diets (16.8 g Ca/kg) with inorganic P led to further improvements in body-weight gain, food intake and food utilisation of chicks fed on high-yeast diets. Bone mineralisation also improved but was always inferior in the yeast-fed chicks compared with control chicks. It was concluded that Ca and P supplementation was necessary in high-yeast diets due to low dietary Ca concentrations and low availability.
mesh_terms: D000473:Alkanes / Q000378:metabolism; D000818:Animals; D001835:Body Weight; D002118:Calcium / Q000378:metabolism*; D002136:Calcium, Dietary / Q000008:administration & dosage; D002645:Chickens / Q000378:metabolism*; D004044:Dietary Proteins / Q000008:administration & dosage*; D005656:Fungal Proteins / Q000008:administration & dosage*; D008297:Male; D010758:Phosphorus / Q000378:metabolism*; D015003:Yeasts / Q000378:metabolism
chemical_list: D000473:Alkanes; D002136:Calcium, Dietary; D004044:Dietary Proteins; D005656:Fungal Proteins; D010758:Phosphorus; D002118:Calcium