The profitability of pig farming is determined to a large extent by the reproductive performance that’s number of piglets born alive/sow/year. This is governed by two factors; litter size and number of litters each produces each year.
Gestation length =114 days.
Lactation length = 28 days.
Weaning to oestrus = 8days.
Total = 150 days.
Potential = 2.4litters/sow/year.
Average piglets born alive perlitter 14. Therefore, number of piglets / sow / years = 28.
Infectious diseases can play arole in reproductive failure but there is a tendency to blame them foreverything. Many microorganisms cause reproductive failure in pigs. However, itis frequently hard to prove they are involved with the reproductive failure.
Reproductive failure occurswhen the bred sow or gilt does not conceive or fails to farrow a healthylitter. It may appear as: normal return to oestrus (18-24 days), delayed returnto oestrus (<25 days), abortion, pseudo pregnancy, failure to farrow,mummified foetuses, still births, small litter size, abnormal/malformed pigletsand decreased neonatal survival.