The objective of this study was to evaluate the effects of different levels of dietary ME on growth performance and carcass characteristics in two different strains of broiler chicken. A total of one thousand, 1-day-old A strain and R strain male chicks were randomly assigned into 8 treatments in a 2×4 factorial arrangement. They were fed iso-nitrogenic (CP 21%) crumbled diets formulated to contain metabolizable energy (ME) 2,950 to 3,250 kcal/kg in increment of 100 kcal/kg in the starter phase (1 to 21d) and iso-nitrogenic (CP 19%) pelleted diets containing same ME levels as in the finishing phase (22 to 38d). The body weight (BW) gain of chicks fed the lower ME diets (2,950 or 3,050 kcal/kg) were higher than those of the higher ME groups. The dietary energy level showed significant effects on feed intake and feed conversion rate (FCR) from 1 to 38 days of age (p<0.05). With the increment of dietary energy, feed intake tended to be reduced, whereas FCR was improved in the two strains of broiler chickens. The lowest FCR was observed at 3,250 kcal/kg diet groups in both of the two strains from 1 to 38 days of age. Feed intake and BW gain during 38 days were significantly affected by the strain factor. Increasing dietary energy up to 3,250 kcal/kg had no effect on the relative weights of breast meat and abdominal fat. The dietary energy and strains showed significant effects on the dressing percentage. There were no significant differences in various blood profiles except for GPT activity.

Abstract. The purpose of this study was to investigate the effects of shift work on depression. Data from the study were analyzed using the The sixth Korea National Health and Nutrition examination survey Ⅵ-2. The results showed that the shift worker had 1.459 times more depressed than the non-shift worker. The quality of life and perception of subjective health status of shift workers were found to be related to depression. The quality of life of these shift workers and the policy approach to improve industrial safety are considered to be a way to improve the mental health of shift workers.

(OR: 0.290,). The quality of life and perception of subjective health status of shift workers were found to be related to depression. The quality of life of these shift workers and the policy approach to improve industrial safety are considered to be a way to improve the mental health of shift workers.

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