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* Most practical definition in all domestic animals.
 
* Most practical definition in all domestic animals.
 
* Acquisition of a threshold body size is important in controlling onset of puberty.
 
* Acquisition of a threshold body size is important in controlling onset of puberty.
* Energy requirements for follicular development and 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.
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* 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.
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