FIGURE 7.

Graphical illustration demonstrating the available energy resources (creatine and glycogen) in the chicken embryo during the pre-post hatch period. Towards hatch, creatine levels in the YS tissue, liver and breast muscle increase while glycogen levels dramatically decrease, reaching low levels at hatch and at chick placement. In the breast muscle, as glycogen levels are depleted, creatine levels are elevated. Thus, highlighting the importance of creatine as an available energy source for the late-term embryo and hatchling.