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International Journal of Poultry Science

.: Home > International Journal of Poultry Science > 2007 > Volume 6 Number 2 > V.L. Christensen2,3, L.G. Bagley4, J. Prestwich4, T. Olson4, M.J. Wineland3 and D.T. Ort3

Length of the Developmental Period of Turkey Eggs Affects Cardiac Physiology and Subsequent Embryo Survival1

V.L. Christensen2,3, L.G. Bagley4, J. Prestwich4, T. Olson4, M.J. Wineland3 and D.T. Ort3
3Department of Poultry Science, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, North Carolina 27695-7608, USA 4Moroni Turkey Hatchery, Moroni, UT 84646, USA
Abstract :

The relationship describing eggshell conductance constants (k) suggests that eggshell conductance (G) is directly related to the length of the incubation period, but inversely with the weight of the egg. Prior studies showed clearly that G is a factor in cardiac health. We tested the hypothesis in the current study that the length of the incubation period may be a factor along with G that affects cardiac physiology and
embryo survival. Incubation temperatures were reduced stepwise by 0.2°C in three treatments (37.5, 37.3
and 37.1°C) to prolong embryo developmental periods. The length of the developmental period was
increased concomitantly in preliminary trials by 6 and 12 h, respectively by the 37.3 and 37.1oC treatments
compared to 37.5°C. Fertilized eggs were incubated using the three temperatures in each of three
independent trials. The time of hatching was closely noted and embryo survival was compared among
treatments. Embryo heart rates and cardiac physiology in each group were observed. Long developmental
periods reduced heart rates in a stepwise fashion and improved embryo survival and cardiac physiology.
Thus, cardiomyopathy may be influenced by the length of the developmental period of turkey embryos
because longer periods facilitated energy metabolism for myocardial function. Longer developmental
periods would be easier to manage than G and may contribute to better turkey embryo viability late in
development

Keywords :
Length of incubation, embryo survival, cardiac physiology

Date Deposited : 14 Jul 2011 11:10

Last Modified : 14 Jul 2011 11:10

Official URL: http://www.pjbs.org/ijps/ijps.htm

Volume 6, Number 2, - 2007 , ISSN 1682-8356

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