Different selection traits of broiler and layer strains result in physiological differences that might be present during incubation. This study aims to investigate an influence of strain on egg composition, development, nutrient metabolism, and heat production (HP) of the embryos. Hatching eggs with an egg weight range of 62.0 to 64.0 g of Lohmann Brown lite and Ross 308 at 41 or 42 wk were selected in 2 batches of 120 eggs per strain. For each batch, 30 eggs of each strain were used for egg composition determination and 90 eggs were separately incubated in 1 of 2 climate respiration chambers with an eggshell temperature (EST) of 37.8 °C. Oxygen and carbon dioxide concentrations were measured in both chambers and in fresh air and the data was used for respiratory quotient (RQ) and heat production (HP) calculation. Embryonic development was determined at D16 and at 6 h post hatch. Gross energy determination was performed for albumen, yolk, residual yolk (RSY), and yolk free body (YFBM). Results showed that broiler eggs had a higher ratio of yolk: albumen with 2.41 g more yolk and 1.48 g less albumen than layers. Yolk energy content of broiler eggs was 42.86 kJ higher than that of layer eggs, whereas albumen energy content did not differ. As a result, energy in albumen + yolk of broiler eggs was 45.26 kJ higher than that of layer eggs. YFBM at D16 and at hatch, chick weight and chick length of broiler was higher than that of layer. RQ of broiler embryos was higher than layer embryos during D8 to D10. A slightly higher RSY weight of broiler embryos than layer embryos at D16 (0.8 g) and at hatch (0.2 g) indicated more yolk used, which resulted in more energy utilization and energy deposited into YFBM. Embryonic HP of broiler embryos was higher than that of layer from D12 to D18, but efficiency of converting energy used by embryos to YFBM was similar. In conclusion, broiler and layer embryos have different growth trajectory, which affect energy utilization and embryonic HP during incubation.
|Title of host publication||Abstract of the Poultry Science Association 103rd Annual Meeting|
|Publication status||Published - 2014|
|Event||Poultry Science Association 103rd Annual Meeting, Corpus Christi, Texas, USA - |
Duration: 14 Jul 2014 → 17 Jul 2014
|Conference||Poultry Science Association 103rd Annual Meeting, Corpus Christi, Texas, USA|
|Period||14/07/14 → 17/07/14|
Nangsuay, A., Meijerhof, R., van den Anker, I., Heetkamp, M. J. W., Kemp, B., & van den Brand, H. (2014). Embryonic development, energy utilization, and heat production of broiler and layer embryos. In E. D. Porter (Ed.), Abstract of the Poultry Science Association 103rd Annual Meeting (Vol. 93, pp. 55-nr 162)