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Changes in the lipid metabolism of the chick embryo with parental age
Insights
Embryonic mortality in broiler breeders is linked to abnormal lipid distribution. Young breeders
Area of Science:
- Lipid metabolism
- Embryonic development
- Avian reproduction
Background:
- Broiler breeder stock age influences egg quality and embryonic development.
- Lipid metabolism plays a crucial role in avian embryonic development.
- Understanding lipid distribution is key to addressing embryonic mortality.
Purpose of the Study:
- To investigate the distribution and composition of lipids in chick embryos from different aged broiler breeder stocks.
- To correlate lipid distribution patterns with embryonic mortality rates.
- To identify potential causes of embryonic mortality related to lipid metabolism.
Main Methods:
- Lipid analysis of yolk contents, yolk sac membrane, liver, and extrahepatic tissues.
- Comparison of lipid profiles between embryos from 25-week-old and 41-week-old broiler breeders.
- Assessment of embryonic mortality at Days 15 and 19 of incubation.
Main Results:
- Higher embryo mortality in eggs from younger breeders (25-week-old) was associated with abnormal lipid distribution.
- Embryos from younger breeders had higher total yolk lipid content but a greater proportion remained in the yolk contents at Day 19.
- Reduced lipid transfer to extrahepatic tissues was observed in embryos from younger breeders, indicating impaired yolk lipid assimilation and mobilization.
Conclusions:
- Malfunction in yolk lipid assimilation and mobilization from yolk contents contributes to higher embryonic mortality in younger broiler breeders.
- Impaired lipid transfer denies essential nutrients for embryonic development during the critical late incubation period.
- Optimizing lipid metabolism through breeder management could improve hatchability and chick quality.
Abstract:
A study has been made on the distribution and composition of the lipids associated with the yolk contents, yolk sac membrane, liver, and extrahepatic tissues of chick embryos at Days 15 and 19 of incubation from 25- and 41-week-old broiler-breeder stock. The higher embryo mortality displayed by the eggs from the young breeders was associated with an abnormal distribution of lipid between the tissue pools. The amount of lipid associated with the total yolk, i.e., yolk contents plus yolk sac membrane, of the embryos from the 25-week-old parents at Day 19 of incubation was greater than that of the embryos from the 41-week-old parents, and there was a much higher proportion of lipid still remaining in association with the yolk contents. In the embryos from the young parents, a smaller proportion of embryonic lipid was associated with the extra-hepatic tissues at Day 19 of incubation. Differences were observed in the relative proportions of the major lipid fractions within the yolk and embryonic tissues between the eggs from the two sets of parents. The higher mortality of the embryos from the young parents was associated with a malfunction of yolk lipid assimilation and mobilization from the yolk contents thereby denying access to the major nutrient associated with development during the last week of incubation.