caa a22 4500 397567332 CHVBK 20180308164831.0 cr unu---uuuuu 161202e199611 xx s 000 0 eng 10.3382/ps.0751308 doi (NATIONALLICENCE)oxford-10.3382/ps.0751308 Group Selection for Adaptation to Multiple-Hen Cages: Production Traits During Heat and Cold Exposures [Elektronische Daten] [PATRICIA Y. HESTER, W. M. MUIR, J. V. CRAIG, J. L. ALBRIGHT] A selected line of White Leghorns that has shown improved survivability and productivity and reduced feather loss in multiple-hen cages was evaluated for production traits under both stressed and unstressed conditions. It was hypothesized that hens selected for adaptation to multiple-bird cages would react less intensely to stressors and therefore lay more eggs and have lower mortality under stressed conditions. Three lines of chickens (selected, control, and commercial) were housed in either single-hen (1 hen) or multiple-hen cages (12 hens, social competition) at 16.7 or 17.1 wk of age. They were subsequently subjected to cold exposure at 33 wk of age and heat exposure at 44 wk of age. The selected line of chickens in multiple-hen cages showed an increased resistance to heat exposure, as indicated by lower mortality, when compared to the control and commercial lines housed in multiple-hen cages. Egg production 8 d prior to, during, and 8 d following either cold or heat exposures indicated that the selected line of chickens withstood social, handling, and environmental stressors better than the control line and, in some cases, the commercial line of chickens. It was concluded that the selected line of Leghorns showed evidence of stress resistance through lowered mortality and improved production. © 1996 Poultry Science Association, Inc. Breeding and Genetics nationallicence selection nationallicence adaptation nationallicence multiple-hen cages nationallicence Leghorns nationallicence production nationallicence HESTER PATRICIA Y. aut MUIR W. M. aut CRAIG J. V. aut ALBRIGHT J. L. aut Poultry Science Oxford University Press 75/11(1996-11), 1308-1314 0032-5791 75:11<1308 1996 75 ps https://doi.org/10.3382/ps.0751308 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0751308 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- HESTER PATRICIA Y. aut NATIONALLICENCE 700 1- MUIR W. M. aut NATIONALLICENCE 700 1- CRAIG J. V. aut NATIONALLICENCE 700 1- ALBRIGHT J. L. aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/11(1996-11), 1308-1314 0032-5791 75:11<1308 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence SWISSBIB 397567154 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford