Question:  query regarding oestrous of a female pig 
Answer: told him to leave 3-4 oestrous cycle to get good conception rate , since the puberty is not the sexual maturity , puberty is the term which denotes  when the male & female is  capable to release gonad i.e ova ( graffian follicle -- due to oxytocin  ) from the overy  in case of female & spermatozoa  in case of male from seminiferous tuble of testis  [ sartoli & leidig cells ], the first release of ova from the overy may not capable for fertilization , several circles may require to get mature ova from overy -- that is why some cycles should be omitted toobtain  good litter size , the oestrous cycle is 18-21 days for sow & gilt