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Green Light-emitting Diodes Light Stimuli during Incubation Enhances Posthatch Growth without Disrupting Normal Eye Development of Broiler Embryos and Hatchlings

  • Zhang, L. (Jiangsu Provincial Key Laboratory of Animal Origin Food Production and Safety Guarantee, College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Zhu, X.D. (College of Science, Nanjing Agricultural University) ;
  • Wang, X.F. (College of Science, Nanjing Agricultural University) ;
  • Li, J.L. (Jiangsu Provincial Key Laboratory of Animal Origin Food Production and Safety Guarantee, College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Gao, F. (Jiangsu Provincial Key Laboratory of Animal Origin Food Production and Safety Guarantee, College of Animal Science and Technology, Nanjing Agricultural University) ;
  • Zhou, G.H. (Jiangsu Provincial Key Laboratory of Animal Origin Food Production and Safety Guarantee, College of Animal Science and Technology, Nanjing Agricultural University)
  • Received : 2015.11.28
  • Accepted : 2016.02.15
  • Published : 2016.11.01

Abstract

Monochromatic green light-emitting diodes (LED) light stimuli influences the posthatch growth performance of chicks. This study was undertaken with the following objectives: i) to examine whether the green LED light stimuli induces an overheating effect by determining weight loss rate of fertile eggs during incubation period; ii) to look for the development of eyes and other primary organs at different ages of embryos and newly hatched chicks. Arbor Acres fertile broiler eggs (n = 480) were randomly assigned to 3 incubation groups and exposed to continuous white light, green light, or a dark environment (control) from the first day to 19 d of incubation. The light sourced from LED lamps with the intensity of 30 lx at eggshell level. The results showed that either green or white light stimuli during incubation did not significantly affect the weight loss rate of fertile eggs, hatching time, hatchability, chick embryo, or body weight (BW), the weight percentage of heart, liver, and eyes, as well as obvious systematic abnormalities in eye weight, side-to-side, back-to-front, or corneal diameter from 15 d of embryogenesis to 6 d of posthatch (p>0.05). Compared with the dark condition, green light stimuli during incubation tended to increase feed intake (p = 0.080), improved the BW gain of chicks during 0 to 6 day posthatch (p<0.05), and increased the percentage of pectoral muscle to the BW on 3- and 6-day-old chicks. In addition, embryos or chicks in green light had lower weight percentage of yolk retention on 19 d of embryogenesis and 1 d of posthatch in comparison to those in dark or white group (p<0.05). These results suggest that providing 30 lx green LED light stimuli during incubation has no detrimental effect on the development of eyes, heart and liver of embryos and hatchlings, but does have potential benefits in terms of enhancement of the chick growth during the early posthatch stages. In addition, the fertile broiler eggs stimulated with 30 lx green LED light during incubation does not cause an overheating effect.

Keywords

Chick Embryo;Incubation;Light Emitting Diodes;Light Stimuli

Acknowledgement

Supported by : Research Fund for the Doctoral Program of Higher Education of China

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