1. We have studied the kinetics of the conversion of 5-aminolaevulinate into haem and haem precursors in homogenates of livers of rats and chick embryos. Homogenates of fresh liver from both species efficiently convert 5-aminolaevulinate into haem. After frozen storage for 1 year, homogenates of rat, but not chick, liver have decreased rates of formation of haem with accumulation of more protop...

1. The changes in the net amounts of retinol, retinyl esters and retinal in both the developing chick embryo and the newly hatched chick were investigated. The embryo requires about 68nmol of the vitamin for its growth, whereas the baby chick requires about 108nmol during the first 7 days after hatching. 2. Retinal was present in the egg in fairly high concentrations at the beginning of the inc...

Although there is more evidence that shows that IFNs (interferons) plays a very important role in the early development of the embryo, the mechanism of IFNs is still unclear. Our study showed that IFRG is expressed from oocytes- through to the preimplantation embryo in rabbits. This finding provides some clues for better understanding the role of IFNs in the development of the embryo. The full ...

Title of Document: INVESTIGATION OF CHICKEN EMBYO METABOLISM AND SUBSTRATE UTILIZATION DURING LATER DEVELOPMENT Qiong Hu, Doctor of Philosophy, 2013 Directed By: Associate Professor, Brian J. Bequette, Department of Animal and Avian Sciences The objective of this research was to determine metabolic adaptations and substrate utilization during chicken embryo development and to determine the infl...

To investigate whether supplementing manganese (Mn) to the maternal diet could reduce the deleterious effect of heat stress on the developing embryo, the hatchability, antioxidant status, and expression of heat shock proteins (HSP) were evaluated in chick embryos under normal and high incubation temperatures. A completely randomized design ( = 6) with 2 maternal dietary Mn treatments (unsupplem...

The effect of fasting on spawning performance, maternal, and egg nutrient composition, embryo/larval development was monitored in gilthead seabream (Sparus aurata). Two broodstocks were fasted during two consecutive years, for a period 43 54 days within the season, preliminary (year 1, 5-year-old breeders) main study 2, 6-year-old breeders), respectively. Mean daily fecundity showed declining t...