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- W2147705093 abstract "Environmental conditions during incubation such as temperature and O2 concentration affect embryo development that may be associated with modifications in nutrient partitioning. Additionally, prenatal conditions can affect postnatal nutrient utilization. Using broiler chicken embryos, we studied the effects of eggshell temperature (EST; 37.8 or 38.9°C) and O2 (17, 21, or 25%) applied from d 7 until 19 of incubation in a 2 × 3 factorial design. Effects of these factors on embryonic survival, development, and nutrient utilization were assessed in the pre- and posthatch period. High EST reduced yolk-free body mass compared with normal EST (36.1 vs. 37.7 g), possibly through reduced incubation duration (479 vs. 487 h) and lower efficiency of protein utilization for growth (83.6 vs. 86.8%). Increasing O2 increased yolk-free body mass (from 35.7 to 38.3 g) at 12 h after emergence from the eggshell, but differences were larger between the low and normal O2 than between the normal and high O2. This might be due to the lower efficiency of nutrient utilization for growth at low O2. However, the effects of O2 that were found at 12 h were less pronounced at 48 h posthatch. When O2 was shifted to 21% for all treatments at d 19 of incubation, embryos incubated at low O2 used nutrients more efficiently than those incubated at normal or high O2. An additional negative effect on survival and chick development occurred when embryos were exposed to a combination of high EST and low O2. Possible explanations include reduced nutrient availability for hatching, decreased body development to fulfill the energy-demanding hatching process, and higher incidence of malpositions. In conclusion, EST and O2 during incubation affect nutrient utilization for growth, which may explain differences in survival and development. Embryos raised under suboptimal environmental conditions in the prenatal period may develop adaptive mechanisms that still continue in the posthatch period." @default.
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- W2147705093 date "2010-09-01" @default.
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- W2147705093 title "Effect of eggshell temperature and oxygen concentration on survival rate and nutrient utilization in chicken embryos" @default.
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- W2147705093 doi "https://doi.org/10.3382/ps.2010-00787" @default.
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