关键词: 卵用鸡[49ME], 品系[49DA], 光照制度, 饲养制度, 生产性状[49MC], 基因型与环境的互作[45CC]

Abstract: Two layer strains were used in the experiment, one was a brown-egg strain(S), the other was a white-egg strain(K). From week 9 to week 16 two lighting regimes(gradually decreasing light or 13h constant light) and two feeding regimes(restricted feeding or ad libitum) were used to analyze the effects on laying traits of different strains under different lighting and feeding regimes in the rearing period as well as their genotype-environment interaction. The results indicated as follows:①There were singificant strain differences for the most of laying traits, including several egg quality traits. The S strain was superior to the K strain for the layiny performance. ② Age at 1st egg under gradually decreasing lighting was very significantly later than that under 13h constant lighting, either for the S strain or for the X strain. For the K strain egg production during the age of 300 days under gradually decreasing lighting during the rearing period was significantly higher than than under constant lighting. There was a significant increase in average egg weight under restricted feeding during the rearing period for the S strain. At the same time, restricted feeding improved egg shell strength and Haugh unit for the S. strain. Different lighting and feeding regimes did not significantly affect feed conversion of laying period for both of the two strains. ③Significant strain×lighting regime interactions were found in egg production during the age of 300 days, yolk weight and shell weight. There were significant strain×feeding regime interactions for average egg weight, egg shell strength and shell weight. Egg shell strength and yolk weight were found significant strain×lighting×feeding inter-actions.

Key words: EGG TYPE CHICKENS, LINES(DREEDING), LIGHTING REGIME, FEEDING REGIME, PRODUCTION TRAITS, GENOTYPE-ENVIRONMENT INTERACTION