Analyses of the Lighting Efficiency for Egg Production of the Domestic Fowl
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概要
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The intention of the present study was to analyze some controversies on the lighting experiments for egg production in the chicken. The synopsis contains results of trials which were repeated five times. Four hundred and thirty seven hens of three breeds were randomly assigned to five groups: four light periods of 14-, 16-, 20-, 24-hours per day (L-groups) and a natural daylength (N-group). Hens which have just finished the yearly production test were reared on the floor pen and the experiment was carried out during September to next June. Percentage of egg production in the L-groups began to increase immediately after lighting, but that in the N-group decreased gradually with the shortening daylength. Light efficiency in the L-groups persisted 15 to 17 weeks. Thereafter laying curves descended while laying in the N-group ascended with longer daylength. Rate of production for 15 weeks in the L-groups was significantly higher than that in the N-group. No significant differences were found between L- and N-groups in productive percentages for the whole period. The same aspects were observed among sub-groups within the L-groups. Correlation coefficients between egg production for the past one year and that for the experimental period were generally low, but White Rocks indicated higher values (r=0.4-0.5) than New Hampshires and White Leghorns. Correlations between egg production for the past one year and number of weeks laid for the experimental period resembled the former, but higher values estimated in the White Rocks were noteworthy. These facts suggest that breeds or strains of low fecundity and special breeds may intensely react to photoperiodism. As a matter of course, significantly high correlations over 0.5 were estimated between laying persistency for lighting period and number of egg produced for that period. Time required till non-layers began laying was in the negative relation to daylength. Laying persistencies for lighting periods represented similar results, except the group in 14-hours, but there existed no significant differences between laying and non-laying groups in the persistencies as shown in Table 4.
- 横浜国立大学の論文
- 1973-10-01
著者
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Saeki Yuichi
Department Of Biochemistry And Applied Biosciences Faculty Of Agriculture University Of Miyazaki
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Saeki Yuichi
Department Of Agricultural Chemistry Faculty Of Agriculture Kyushu University
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Akita Tomiji
Department Of Animal Genetics National Institute Of Animal Industry
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