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Puberty Onset Influencing Factors - Anatomy & Physiology (view source)
Revision as of 14:24, 8 September 2008
, 14:24, 8 September 2008→Sheep
* This maximizes the chance that all ewes become pregnant in the fall and give birth in the spring when nutritional and environmental conditions are favourable.
* This maximizes the chance that all ewes become pregnant in the fall and give birth in the spring when nutritional and environmental conditions are favourable.
* An adequate degree of nutrition ('fatness') is required before photoperiod can exert an effect.
* An adequate degree of nutrition ('fatness') is required before photoperiod can exert an effect.
* There are sex differences that also have an effect. Ram lambs reach puberty at ~10 weeks of age during summer, but ewe lambs born at the same time (spring) will not reach puberty until 25-35 weeks of age.
=== Heifers ===
=== Heifers ===