caa a22 4500 397568118 CHVBK 20180308164833.0 cr unu---uuuuu 161202e199604 xx s 000 0 eng 10.3382/ps.0750464 doi (NATIONALLICENCE)oxford-10.3382/ps.0750464 Multiphasic Analysis of Embryonic Mortality in Chickens [Elektronische Daten] [E. W. JASSIM, M. GROSSMAN, W. J. KOOPS, R.A.J. LUYKX] Infertility and embryonic mortality are economically important for the commercial broiler industry because they are components of hatchability. Embryonic mortality in chickens is not uniformly distributed over the course of incubation; two phases of embryonic mortality are characteristic of chicken development. The objective of this paper was to develop a mathematical model to assess infertility and to characterize the distribution over time of embryonic mortality in chickens. A model was constructed based on evidence in the literature for multiple phases of embryonic mortality before and during incubation. A multiphasic model, with two phases, included parameters for the proportion of eggs that were infertile and the proportion that were fertile but the embryo died before or during incubation. For those eggs that were fertile but the embryo died, the model included the proportion of embryonic mortality during each phase, day of peak mortality, and duration of phase. Data on embryonic mortality for white Cornish chickens were used to illustrate the multiphasic model. Model parameters could be estimated easily and interpreted with clear biological meaning. Estimates of parameters, in general, were reasonably precise and consistent with the literature. With multiphasic analysis, one can assess infertility and characterize the distribution of embryonic mortality in chickens, which can lead to a useful understanding of management and genetic aspects of these components of hatchability. © 1996 Poultry Science Association, Inc. Breeding and Genetics nationallicence multiphasic analysis nationallicence infertility nationallicence embryonic mortality nationallicence hatchability nationallicence chicken nationallicence JASSIM E. W. Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801 aut GROSSMAN M. Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801 aut KOOPS W. J. Department of Animal Husbandry, Wageningen Agricultural University, P.O. Box 338, 6700 AH Wageningen, The Netherlands and aut LUYKX R.A.J. Hybro R&D, Euribrid B.V., 5830 AA Boxmeer, The Netherlands aut Poultry Science Oxford University Press 75/4(1996-04), 464-471 0032-5791 75:4<464 1996 75 ps https://doi.org/10.3382/ps.0750464 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.3382/ps.0750464 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- JASSIM E. W. Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801 aut NATIONALLICENCE 700 1- GROSSMAN M. Department of Animal Sciences, University of Illinois, Urbana, Illinois 61801 aut NATIONALLICENCE 700 1- KOOPS W. J. Department of Animal Husbandry, Wageningen Agricultural University, P.O. Box 338, 6700 AH Wageningen, The Netherlands and aut NATIONALLICENCE 700 1- LUYKX R.A.J. Hybro R&D, Euribrid B.V., 5830 AA Boxmeer, The Netherlands aut NATIONALLICENCE 773 0- Poultry Science Oxford University Press 75/4(1996-04), 464-471 0032-5791 75:4<464 1996 75 ps Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford