A 3 × 2 × 2 factorial experiment, consisting of 52 hens per treatment, was conducted
to determine the effects of pullet BW, dietary nonphytate phosphorus (NPP), and feeding
regimen on performance, progeny quality, and bone remodeling. Cobb 500 broiler breeder
pullets were reared to 3 different growth curves: 20% under, Cobb standard, and 20%
over. Body weights were recorded weekly and feed adjustments made accordingly. At
21 wk, 624 hens were fed one of 2 breeder diets differing only in the amount of dietary
NPP: 0.15 or 0.40%. A normal feeding regimen was appropriate for the particular growth
curve; an alternative regimen considered the 3 growth curves together as a flock.
At 24, 26, and 29 wk, blood was collected from 5 hens per treatment every 4 h over
a 24-h period. Plasma samples were analyzed for total alkaline phosphatase, tartrate-resistant
acid phosphatase, parathyroid hormone-related peptide, Ca, and inorganic P. Eggs per
hen housed were diminished in hens fed the low dietary NPP and by low pullet target
weight. Hens fed low dietary NPP also had lower egg weights but better eggshell quality.
Mortality was significantly higher in hens fed low dietary NPP. Breeder tibia relative
strength and ash were also significantly lower in hens fed low dietary NPP, regardless
of the quantitative amount. Progeny tibia ash was not affected by any treatment. Total
alkaline phosphatase responded to pullet BW, however by wk 29, total alkaline phosphatase
also became sensitive to dietary NPP. The NPP by pullet BW interaction for tartrate-resistant
acid phosphatase levels became significant by 29 wk, and pullet BW was significant
at wk 24. The NPP by pullet growth curve interaction was also critical for plasma
inorganic P levels throughout the sampling period. In summary, both 0.15% dietary
NPP and reared pullets 20% under standard BW negatively affect egg production but
do not impair progeny productivity. Body composition appears to be a main contributor
in bone remodeling mechanisms, especially during the transition into egg production.