Effect of Heat Stress on Laying Hen Performance
2008
Oh, K.Y. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Ryu, B.G. (National Academy of Agricultural Science, RDA, Suwon, Republic of Korea) | Chang, D.I. (Chungnam National University, Daejeon, Republic of Korea), E-mail: dichang@cnu.ac.kr | Chang, H.H. (Gyeongsang National University, Jinju, Republic of Korea), E-mail: hhchang@gnu.ac.kr | Kwon, S.H. (Pusan National University, Miryang, Republic of Korea) | Park, S.H. (Yongin Songdam College, Yongin, Republic of Korea) | Lee, S.J. (Chungnam National University, Daejeon, Republic of Korea) | So, J.K. (Chungnam National University, Daejeon, Republic of Korea)
This study was conducted to determine the effect of heat stress on laying hen performance during summer. A total of 180 Hyline-brown layers, 98 days of age, were housed in a enclosed house. The daily maximum temperature in the house was ranged 26~36℃. The egg production was markedly fallen than other days when daily maximum temperature in the layer house became more than 33℃. As water intake and feed intake increased to 490 mL bird-¹ day-¹ and 240 g bird-¹ day-¹, the egg production soared. But it was hardly increased more than them. Based on these results, layer house roof should be amply insulated to improve the egg production of layers. If not insulated, the shade curtain should be installed above roof and cool water sprayed before and after 2 p.m. And layers should be provided cool drinking water of about 15℃ in the day time.
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