Forgotten corner: Seasonal Infertility headache

In the northern hemisphere, Spring is just round the corner after a punitive winter weatherwise. The first line of defence against the complicated and persistent disorder of Summer and/or Autumn Infertility is to increase gilt target matings in spring by 10-15% (dependent on how hard you have been hit in previous years) to compensate for the breeding failures which are likely to occur much later in the year. But there is a second one to think about this early on in the calendar year and it is t