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* The age that the female becomes sexually receptive and displays the first [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]].
 
* The age that the female becomes sexually receptive and displays the first [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]].
 
* Easy to determine because females show outward behavioural signs of sexual receptivity, especially in the presence of a male.
 
* Easy to determine because females show outward behavioural signs of sexual receptivity, especially in the presence of a male.
* The first ovulation is usually not accompanied by behavioural [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]] in heifers and ewes and is hence termed 'silent ovulation'.  Thus, the age at first [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]] may not accurately reflect acquisition of puberty.
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* The first [[The_Ovary_-_Ovulation_-_Anatomy_%26_Physiology|ovulation]] is usually not accompanied by behavioural [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]] in heifers and ewes and is hence termed 'silent ovulation'.  Thus, the age at first [[Reproductive_Behaviour_-_Oestrus_Behaviour_-_Anatomy_%26_Physiology|oestrus]] may not accurately reflect acquisition of puberty.
    
== Age at First Ovulation ==
 
== Age at First Ovulation ==
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