Thermal manipulation of the embryo modifies the physiology and body composition of broiler chickens reared in floor pens without affecting breast meat processing quality1
| Autor: | Nicole Rideau, Anne Collin, Christophe Praud, Sophie Tesseraud, Cécile Berri, Thomas Loyau, Michel J. Duclos, Sandrine Mignon-Grasteau, L. Bedrani, Nadia Everaert, Sonia Métayer-Coustard, Shlomo Yahav |
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| Rok vydání: | 2013 |
| Předmět: |
animal structures
040301 veterinary sciences Hatching Embryogenesis 0402 animal and dairy science Broiler food and beverages Physiology Embryo 04 agricultural and veterinary sciences General Medicine Respiratory physiology Thermoregulation Biology 040201 dairy & animal science 0403 veterinary science embryonic structures Genetics Animal Science and Zoology Composition (visual arts) Food science Food Science Hormone |
| Zdroj: | Journal of Animal Science. 91:3674-3685 |
| ISSN: | 1525-3163 0021-8812 |
| DOI: | 10.2527/jas.2013-6445 |
| Popis: | Selection in broiler chickens has increased muscle mass without similar development of the cardiovascular and respiratory systems, resulting in limited ability to sustain high ambient temperatures. The aim of this study was to determine the long-lasting effects of heat manipulation of the embryo on the physiology, body temperature (Tb), growth rate and meat processing quality of broiler chickens reared in floor pens. Broiler chicken eggs were incubated in control conditions (37.8°C, 56% relative humidity; RH) or exposed to thermal manipulation (TM; 12 h/d, 39.5°C, 65% RH) from d 7 to 16 of embryogenesis. This study was planned in a pedigree design to identify possible heritable characters for further selection of broiler chickens to improve thermotolerance. Thermal manipulation did not affect hatchability but resulted in lower Tb at hatching and until d 28 post-hatch, with associated changes in plasma thyroid hormone concentrations. At d 34, chickens were exposed to a moderate heat challenge (5 h, 32°C). Greater O2 saturation and reduced CO2 partial pressure were observed (P 0.17). In conclusion, TM of the embryo modified the physiology of broilers in the long term as a possible adaptation for heat tolerance, without affecting breast meat quality. This study highlights the value of 2 new heritable characters involved in thermoregulation for further broiler selection. |
| Databáze: | OpenAIRE |
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