Sound exposure and its beneficial effects on embryonic growth and hatching of broiler chicks

The use and impact of auditory stimulation in animals

“…Similar conclusions have been made in dogs who were exposed to an alarm for 3mins (75 dB, 0.25-8 kHz) and subsequently displayed muscle contraction, piloerection and salivation, associated with increased heart rate and blood pressure, and an increased plasma ACTH, noradrenaline and cortisol (Engeland et al, 1990). Consequences of noise exposure have also been studied in chickens, this animal model presenting interest for evaluating the impact of in ovo exposure (Donofre et al, 2020;Kathpalia et al, 2019;Sanyal et al, 2013). As for farm mammals and dogs, noise exposure produced stress as indicated by increased corticosterone in 42-day-old broilers (acute exposure of 10 min at 80 dB and 100 dB, Chloupek 2009), and heterophilic/lymphocyte ratio in 36-week-old hens (exposure of 60 min/day at 90 dB (Campo et al, 2005).…”

Effect of prenatal different auditory environment on learning ability and fearfulness in chicks

“…However, in other studies, unpredictable noise, such as vehicle honking, was used [6,30,31]. These dissonant and noisy structures are associated with aggression, fear and defense [27], which may be the main reason for the different results.In summary, whether the effects of auditory stimulation during egg incubation are beneficial or detrimental well depend on rhythmicity and timing A c c e p t e d A r t i c l e of exposure [12,14,2728]. In this study, the music was the complex rhythmic sound, and the noise was the mixed noise of fans and machinery in the incubator, which was patterned sound.…”

“…In summary, whether the effects of auditory stimulation during egg incubation are beneficial or detrimental well depend on rhythmicity and timing of exposure [ 12 , 14 , 27 , 28 ]. In this study, the music was the complex rhythmic sound, and the noise was the mixed noise of fans and machinery in the incubator, which was patterned sound.…”

“…During the incubation period, 110 dB noise exposure can affect the development of the poultry brain, reduce brain volume and weight [ 10 ], increase thyroxine, and impair learning and memory ability [ 11 ]. In other studies, the noise of commercial hatcheries at 90 dB was beneficial to artificial hatching, led to earlier hatching, higher hatchability, better chick quality [ 12 ]. Furthermore, there is evidence that the species-specific calls can also accelerate the hatching process and improving the hatching quality, which was beneficial to the anti-stress response and spatial orientation ability of day-old chicks [ 12 , 13 ].…”

“…In other studies, the noise of commercial hatcheries at 90 dB was beneficial to artificial hatching, led to earlier hatching, higher hatchability, better chick quality [ 12 ]. Furthermore, there is evidence that the species-specific calls can also accelerate the hatching process and improving the hatching quality, which was beneficial to the anti-stress response and spatial orientation ability of day-old chicks [ 12 , 13 ].…”