effect of calcium and vitamin d supplementations in poultry feed

poultry egg eggshell shell quality strong chicken layer hens flock vitamin bioavailability dietary effects laying broiler requirements digestibility feeding time thickness premixes minerals additive white background concept conceptual designs brochures feed pellet crumble formula formulation nutrition nutrient macro micro trace calcium balance products metabolites cholecalciferol meat bone strength chemical structure dihydroxycholecalciferol absorption phosphorus effect dietvitamin supplementations die tvitamin benefits quality