• 한국축산시설환경학회지
• /
• 제6권2호
• /
• pp.91-96
• /
• 2000

This study was carried out to determine the effect of sound stimulation on growth performance, feeding behaviour and egg production of laying hens. A total of 180 laying hens(4 weeks old) were alloted to 18 cages with 10hens per cage and 6 cages per treatment. Laying hens were exposed to three sounds: control, Leq 50dB and Leq 75dB. The growth performance was measured fro m4 weeks to 17 weeks of age, feeding behaviour was observed at 5weeks, 7weeks, 10weeks and 50 weeks of age using data from real-time videotapes, while eg production was recorded from 20 weeks to 50 weeks of age. Growth performance was improved in the sound stimulated laying hens from 12 weeks to 17 weeks of age. In the 50dB simulated laying hens spent more longer time for feeding than others during the experimental period. Egg production of 50dB stimulated laying hens from 20 weeks to 50 weeks was higher than others, however 75dB stimulated laying hens were significantly lower than 50dB stimulated hens(P<0.05). The results indicated that the growth and egg production of egg type chicken can be influenced by sound stimulation through physiological rhythm.

• International Journal of Industrial Entomology and Biomaterials
• /
• 제26권1호
• /
• pp.22-30
• /
• 2013

The reproductive performance of multivoltine breed 'Nistari' and bivoltine breeds as NB18, P5 and a bivoltine hybrid (NB18 ${\times}$ P5) of B. mori were studied in different seasons in terms of total number of eggs laid, unlaid and hatching efficiency of the laid eggs to critically assess the breeds / hybrid potentiality. The bivoltine hybrid showed better performance in all the seasons as compared to the breeds investigated, as expected due to possibility of hybrid vigour. Among the breeds, bivoltine P5 had a better egg laid performance in S1 (February - March), S2 (May - June) and S3 (September - October) seasons but with an increase in the number of unlaid eggs. The hatching percentage, although didn't show any definitive trend, still suggested a marginal better performance in the hybrid. Most importantly, egg laying rhythmicity was studied by mating the female moth at 6.00 a.m. for $3{\frac{1}{2}}$ hours, and subsequently allowing the laying of eggs both under BOD condition ($25{\pm}1^{\circ}C$ and $85{\pm}5%$ RH) and at ambient temperature ($23-28^{\circ}C$ and $74.7{\pm}5%$) separately. Maximum (90%) egg laid occurred from 3.30 to 7.30 pm (i.e. 4 - 6 h after decoupling). Similar laying patterns were observed when females where mated at 12 noon and decoupled at 3.30 pm, revealing that late photoperiod and early scotoperiod were favourable for egg laying in case of multivoltine breed and bivoltine prefers late photoperiod for egg laying.