Effect of Broiler Breeder Genetic Strain and Parent Flock Age on Eggshell Conductance and Embryonic Metabolism

The effect of genetic strain (Ross 308; Cobb 500) and parent flock age [young (29 wk), peak (Ross = 34 wk; Cobb = 36 wk), postpeak (40 wk), mature (45 wk), old (55 wk), and very old (59 wk)] on eggshell conductance and embryonic metabolism were examined. At each flock age, eggs from each strain were...

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Veröffentlicht in:	Poultry science 2007-11, Vol.86 (11), p.2420-2432
Hauptverfasser:	Hamidu, J.A, Fasenko, G.M, Feddes, J.J.R, O'Dea, E.E, Ouellette, C.A, Wineland, M.J, Christensen, V.L
Format:	Artikel
Sprache:	eng
Schlagworte:	Aging - physiology animal age Animals broiler breeders carbon dioxide Carbon Dioxide - metabolism cell respiration Chick Embryo - metabolism Chickens - genetics Egg Shell - physiology egg shell quality Electric Conductivity embryo (animal) embryogenesis embryonic metabolism embryonic mortality Energy Metabolism genetic variation genotype heat production Hot Temperature incubation oxygen Oxygen Consumption temporal variation
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Zusammenfassung:	The effect of genetic strain (Ross 308; Cobb 500) and parent flock age [young (29 wk), peak (Ross = 34 wk; Cobb = 36 wk), postpeak (40 wk), mature (45 wk), old (55 wk), and very old (59 wk)] on eggshell conductance and embryonic metabolism were examined. At each flock age, eggs from each strain were incubated for 21.5 d in individual metabolic chambers to measure embryonic O₂ intake and CO₂ output. From these data, the respiratory quotient (RQ) and metabolic heat production were calculated. Data were analyzed by the GLM procedure of SAS at P
ISSN:	0032-5791 1525-3171
DOI:	10.3382/ps.2007-00265