* Energy requirements for follicular development and [[The_Ovary_-_Ovulation_-_Anatomy_%26_Physiology|ovulation]] are small, however the metabolic cost of pregnancy and lactation are high so the female must reach a 'metabolic threshold' before puberty can occur. | * Energy requirements for follicular development and [[The_Ovary_-_Ovulation_-_Anatomy_%26_Physiology|ovulation]] are small, however the metabolic cost of pregnancy and lactation are high so the female must reach a 'metabolic threshold' before puberty can occur. |