Multiphasic Model of Egg Production in Laying Hens.
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概要
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Egg production in laying hens was characterized by clutches. This study sought to examine the variability of the clutch characteristics and predictability of annual egg production by the multiphasic model of KOOPS and GROSSMAN (1992) with consideration of internal laying.Oviposition time of 135 and 123 hens in high and low lines, respectively, of a population divergently selected for yolkalbumen ratio, wree observed at four stages of a laying period. Observation duration in each stage was about 30 days. Clutch characteristics considered in this study were LAG (mean lag of oviposition time within clutch) and DELAY (mean delay of pause day between clutches) estimated by a multiphasic model, rate of internal laying (IP), the number of clutches (CN), average length of clutches (CL) and average size of clutches (CS).LAG in both lines did not significantly vary over the four observed stages. DELAY, IP, and CN markedly increased, while CL and CS significantly decreased by stages in both lines. LAG in high line was significantly shorter than that in low line, which suggested that egg production in high line should be higher than that in low line. However, because the rate of internal laying in high line was higher than that in low line, the egg production in two lines was not significantly different.Correlation of LAG with CN was high and positive, and that with CL and CS was medium and negative. LAG and IP showed negative correlation resulting from the inclusion of internal laying in the clutch definition.The information of clutch characteristics in stages 1 and 2 at 120 and 188 days from onset of lay, respectively, was used to predict egg number of individual hens for the periods of 270 and 360 days of egg production by the multiphasic model. Mean of predicted values was about 35 eggs higher than that of actual number of eggs with correlation coefficients from 0.6 to 0.8.
- 日本家禽学会の論文
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