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Effects of light intensity on growth performance, blood components, carcass characteristics, and welfare of broilers

김현수|김지혁|손지선|홍의철|Hee-Jin Kim
한국축산학회 (Korean Society of Animal Sciences and Technology)|2022.09|한국축산학회지 (Journal of Animal Science and Technology)|제64권 제5호|pp. 985-996

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참고문헌

키워드

StressPerformanceWelfareBroilerLight intensityCarcass characteristics
주제분류축산학

초록

This study investigated the effects of light intensity on growth performance, blood components,eye condition, and carcass characteristics of broiler chickens. Three hundred andfifty-two 1-day-old male chicks were assigned to one of four treatments (four repetitions pertreatment, 22 birds per repetition) and reared in a floor pen for 5 weeks. From the secondweek, chicks were reared under four different levels of light intensity (5, 20, 35, and 50 lx) andthe lighting duration was maintained at 18-hours light : 6-hours dark (18L : 6D). The feed intakeand body weight were measured weekly. At 35 days of age, 12 birds per treatment wererandomly selected for blood sampling, eye measurement, and carcass analysis. There wereno significant differences in body weight gain, feed intake, and feed conversion ratio amongtreatments. Triglyceride levels in the serum were significantly higher in the 5 lx treatment, andcreatinine was significantly lower in the 5 lx treatment (p < 0.05). The heterophil : lymphocyteratios decreased significantly as light intensity increased (p < 0.05); however, other blood cellcompositions were not affected by light intensity. Interleukin-6 content was significantly higherin the 5 lx treatment than in other treatments (p < 0.05), but the content of tumor necrosisfactor-α was not significantly different among treatments. Serum corticosterone concentrationwas significantly higher at 5 lx than at 20, 35, and 50 lx (p < 0.05). The corneal diameterwas the highest in 5 lx treatment (p < 0.05), and tended to increase as the light intensitydecreased. Other eye parameters were not significantly different among treatments, but displayeda tendency to increase as the light intensity decreased. Carcass yield and part yieldswere not affected by light intensity. Meat quality parameters (pH, color, cooking loss, andwater-holding capacity) did not show significant difference among the treatments. The resultsindicate that a light intensity of 5 lx may increase physiological stress or have a negative effecton broiler welfare, even if the performance and carcass characteristics are not affected. Therefore, a light intensity of 20 lx or above is recommended considering both the growthperformance and welfare of broilers.

Abstract

This study investigated the effects of light intensity on growth performance, blood components,eye condition, and carcass characteristics of broiler chickens. Three hundred andfifty-two 1-day-old male chicks were assigned to one of four treatments (four repetitions pertreatment, 22 birds per repetition) and reared in a floor pen for 5 weeks. From the secondweek, chicks were reared under four different levels of light intensity (5, 20, 35, and 50 lx) andthe lighting duration was maintained at 18-hours light : 6-hours dark (18L : 6D). The feed intakeand body weight were measured weekly. At 35 days of age, 12 birds per treatment wererandomly selected for blood sampling, eye measurement, and carcass analysis. There wereno significant differences in body weight gain, feed intake, and feed conversion ratio amongtreatments. Triglyceride levels in the serum were significantly higher in the 5 lx treatment, andcreatinine was significantly lower in the 5 lx treatment (p < 0.05). The heterophil : lymphocyteratios decreased significantly as light intensity increased (p < 0.05); however, other blood cellcompositions were not affected by light intensity. Interleukin-6 content was significantly higherin the 5 lx treatment than in other treatments (p < 0.05), but the content of tumor necrosisfactor-α was not significantly different among treatments. Serum corticosterone concentrationwas significantly higher at 5 lx than at 20, 35, and 50 lx (p < 0.05). The corneal diameterwas the highest in 5 lx treatment (p < 0.05), and tended to increase as the light intensitydecreased. Other eye parameters were not significantly different among treatments, but displayeda tendency to increase as the light intensity decreased. Carcass yield and part yieldswere not affected by light intensity. Meat quality parameters (pH, color, cooking loss, andwater-holding capacity) did not show significant difference among the treatments. The resultsindicate that a light intensity of 5 lx may increase physiological stress or have a negative effecton broiler welfare, even if the performance and carcass characteristics are not affected. Therefore, a light intensity of 20 lx or above is recommended considering both the growthperformance and welfare of broilers.

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