Effects of green light illumination with different photoperiods during incubation on the growth of Yunling Red Broiler chickens
In order to reveal the effects of green light illumination with different photoperiods during incubation on the growth of Yunling Red Broiler chicken after hatching,512 breeding eggs of Yunling Red Broiler chicken were randomly divided into a control group,an 8 h light group(8L∶16D),a 16 h light group(16L∶8D)and a 24 h light group(24L∶0D),with 128 breeding eggs included in each group.During the incubation period of the day 0 to 18,the 8L∶16D group,16L∶8D group and 24L∶0D group were illuminated every day with green light of 25-99 lx for 8 h,16 h and 24 h,respectively.The differences of the growth indexes of post-hatch growth of Yunling Red Broiler chicken within 6 weeks were analyzed.The results showed that after the chicks were hatched,the growth indexes such as body weight,body size and pectoral muscle weight of chicks in the 8L∶16D and 16L∶8D groups were generally better than those in the control group and the 24L∶0D group at 7,14,21,28,35 and 42 days post-hatch,with the 8L∶16D group showing the most effective growth promotion.At 42 days,compared with the 16L∶8D group,chicks in the 8L∶16D group showed an increase in body weight,and pectoral muscle weight of 194.2 g(P＜0.01),and 28.59 g(P＜0.01),respectively.Compared with the 24L∶0D group,chicks in the 8L∶16D group showed an increase in body weight,breast width,pectoral muscle weight,and liver weight by 326.41 g(P＜0.01),1.08 cm(P＜0.05),41.72 g(P＜0.01)and 3.58 g(P＜0.05),respectively.The body weight,chest width,chest depth,pectoral muscle weight,heart weight and liver weight of chicks in the 8L∶16D group were significantly increased compared to the control group by 350.38 g(P＜0.01),1.62 cm(P＜0.01),1.3 cm(P＜0.01),45.5 g(P＜0.01),1.85 g(P＜0.05)and 4.2 g(P＜0.05),re-spectively.In conclusion,green light illumination of Yunling Red Broiler eggs for 8-16 h(light intensity 25-99 lx)every day during incubation significantly promoted the growth of chicks after hatching,and the overall effect of 8-hour light group(8L∶16D)was better than other groups.
green lightincubation periodphotoperiodYunling Red broilergrowth index
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