Changes

== Age at First Oestrus ==

== Age at First Oestrus ==

* The age that the female becomes sexually receptive and displays the first 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 oestrus in heifers and ewes and is hence termed 'silent ovulation'.  Thus, the age at first oestrus may not accurately reflect acquisition of puberty.  

* 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.

== Age at First Ovulation ==

== Age at First Ovulation ==