Factors influencing embryo and poult viability and growth during long term storage of turkey eggs

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" Factors influencing embryo and poult viability and growth during long term storage of turkey eggs "
G. M. Fasenko V. L. Christensen

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1104011
Doc. No	:	TLpq304267451
Main Entry	:	G. M. Fasenko
	:	V. L. Christensen
Title & Author	:	Factors influencing embryo and poult viability and growth during long term storage of turkey eggs\ G. M. FasenkoV. L. Christensen
College	:	North Carolina State University
Date	:	1996
student score	:	1996
Degree	:	Ph.D.
Page No	:	168-168 p.
Abstract	:	In the first study, storage of eggs for 14 versus 4 days reduced embryo survival and hatchability. Three prestorage, preincubation warming times did advance embryonic development, but did not influence hatchability of fertile eggs. In the second study, examination of the perivitelline complexes using TEM showed that the thickness of the distinct layers of the perivitelline complex did not vary with storage, but the density of the perivitelline complex layers did decrease in stored eggs. The third study in Trial 1, seven day incubated embryo weights, poult weights and heart and hepatic glycogen concentrations were depressed, while whole embryo glycogen concentrations, embryo mortality, the number of pipped embryos not hatching, and heart and hepatic weights were greater in stored eggs. Hatchability was lower in stored eggs. Plasma concentration of usd\betausd-hydroxybutyrate and pyruvate were higher in poults from unstored and stored eggs respectively. In Trial 1 growth of embryos and poults from stored eggs was delayed by about 18 hours. In Trial 2, the stored eggs were set 18 hours prior to setting of the unstored eggs to allow the growth of the stored eggs to catch up to the growth of the unstored eggs. There were no differences in all but one measurement (heart glycogen was depressed in stored eggs) when stored eggs were set 18 hours earlier in Trial 2. In the fourth study there were no interactions between length of egg storage and hatcher holding times for any of the growth parameters measured. Liver weights and plasma glucose levels increased as hatcher holding time increased, and heart glycogen concentrations decreased concurrently as both egg storage length and hatcher holding time increased. Although the interaction between egg storage and hatcher holding was not significant, the effects on heart glycogen were additive and may place the poult at risk for heart failure. In the fifth study, increased levels of plasma uric acid and activity of hepatic glucose 6-phosphatase in poults from 14 day stored eggs indicates a higher reliance on gluconeogenesis. This adaptation of carbohydrate metabolism may be a survival mechanism employed by poults from long term stored eggs.
Subject	:	Anatomy physiology
	:	Animals
	:	Biological sciences
	:	gluconeogenesis
	:	Livestock
	:	Livestock