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Executive Summary Mentoring is both an opportunity and a risk. It is largely a teaching process beginning with parental nurturing of children and continuing through the lifecycle of organizational and personal interrelationships. A key principle considered in this article is that mentoring is both an obligation and responsibility of leadership. Through mentoring, the wisdom and experience of the senior is passed to the junior. This includes passing on and discussing principles, traditions, shared values, quality, and lessons learned. Mentoring provides a framework to bring about a cultural change in the way we view the professional development of competent future leaders. The road to the top in most organizations today is an uphill and bumpy ride—you simply can't float to the top. Mentoring is a key way to help us get to our destination.

The bile acid pools of developing rats were measured by gas-liquid chromatography. From shortly after birth the bile acid pools fell to a nadir on the 10th day of life (0.295 ± 0.031 mg · g^-1 body weight at 2 days to 0.144 ± 0.012 mg · g^-1 body weight at 10 days, p < 0.001). The pool re-expanded rapidly between the 12th and 15th day. After weaning and during puberty there was a further temporary increase in pool size, during which females had larger pools than males. By adulthood the pool size had returned to the 2-day-old and weanling (15- and 18-day-old) levels, expressed per gramme body weight, and there was no longer a significant sex difference. These results show that changes in pool size are occurring at times when there are major physiological changes in the developing animal. The changes during puberty suggest hormonal control.

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