Immature Body Weight of Layers and Their Laying Performance.

概要

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The laying performance and egg quality of layers, which received their the first duet during the period either from September, 1995 to February, 1996 (total 4 flocks, 17, 000 birds/flock; called 95 group for short) or from September, 1996 to February, 1997 (total 4 flocks, 17, 000 birds/flock; called 96 group for short), was analyzed in this paper, to explain the effect of body weight during rearing period on their following laying performance. Average body weight, at 17 weeks of age, was 60g heavier (about a gain of body weight for a week) in 95 group than in 96 group. Corresponding this, the age arrived at 50% egg production was earlier, rate of egg production was higher and average egg weight was heavier in 95 group than in 96 group, although there was no significant difference in feed intake. There was no significant difference in egg quality (Hough unit, yolk color fan score and shell thickness) between 95 and 96 groups. These results indicate that one of the points to achieve a higher performance in layer is to improve their growth during rearing period.
日本家禽学会の論文