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** Ovulation rate is lower in summer.
 
** Ovulation rate is lower in summer.
 
** Artificially reducing the day length from May-August will decrease the interval from weaning to oestrus from 23.6 days  on average to 5.7 days.
 
** Artificially reducing the day length from May-August will decrease the interval from weaning to oestrus from 23.6 days  on average to 5.7 days.
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* The oestrous cycle normally lasts 21 days, interrupted only by pregnancy and lactation.
    
=== Cyclic Changes in the Ovaries ===
 
=== Cyclic Changes in the Ovaries ===
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