Figure 1.

Concentrations of inorganic P (SEM = 0.09), calcium (SEM = 0.27), and myo-inositol (SEM = 0.01) in the blood plasma of 2 laying hen strains (LB and LSL) in different weeks of life (n = 9 to 10 hens). The concentration of inorganic P was higher in LB than in LSL hens (P = 0.026 for strain) and higher in weeks 10, 16, and 60 than in week 30, which was higher than week 24 (P < 0.001 for the period). The concentration of Ca was increased with each week (P < 0.001 for period). The concentration of myo-inositol did only differ between strains in week 60, causing a strain × period interaction (P = 0.004). Abbreviations: Ca, calcium; LB, Lohmann Brown-classic; LSL, Lohmann LSL-classic; P, phosphorus.