Abstract
The plasma concentration of a lipophosphoprotein complex (LPP) averaged higher in nonbroody hens from a line selected for increased egg production (E) than in nonbroody hens from three growth strains of turkeys. The total plasma pool of LPP averaged higher in the growth lines. The concentration and total amount of LPP significantly declined during the 180-day production period in all lines. Plasma total calcium and total phosphorus concentrations increased greatly with the onset of egg production. Further significant increases in calcium (P<.05) and phosphorus (P<.01) concentrations were observed in medium-bodied hens after approximately three months of production. Plasma total calcium concentration declined (P<.01) in all lines during the last three months of the laying period.Number of broody periods from 0 to 84 days in production and effective length of the laying period were negatively correlated (P<.05) with initial (prior to stimulatory lighting) total phosphorus concentration in medium-bodied hens. Initial total calcium concentration was positively correlated (P<.05) with total days lost from broodiness for the total production period (0–180 days) and negatively correlated (P<.05) with effective length of the laying period in large-bodied hens. All correlation coefficients were small, however (less than .30).
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