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Monogastric Production Swine Section. Swine Reproduction. Reproduction in the Female. Gilts reach puberty = 5-8 months of age Estrous cycle = 21 d Length of estrus = 2-3 d Weaning to estrus interval = 5 d Length of gestation = 114 d Pregnancies per year = 2.0-2.3 Pigs per sow/yr = 14-20.

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reproduction in the female
Reproduction in the Female
  • Gilts reach puberty = 5-8 months of age
  • Estrous cycle = 21 d
  • Length of estrus = 2-3 d
  • Weaning to estrus interval = 5 d
  • Length of gestation = 114 d
  • Pregnancies per year = 2.0-2.3
  • Pigs per sow/yr = 14-20
litters sow yr
Litters/Sow/Yr
  • 5 d + 114 d + 21 d = 140 d/litter
  • 365 d/140 d = 2.5 litters/sow/yr
  • 5 d = weaning to estrus
  • 114 d = gestation length
  • 21 d = age of pigs at weaning
reproduction continued
Reproduction continued
  • Females should be mated at least 2X during the estrus period.
  • Ovulation occurs about 12 hours before the end of estrus or 36 hours from the onset of estrus.
male reproduction
Male Reproduction
  • Semen volume/ejaculate = 150 to 200 ml
  • Total sperm/ejaculate = 30-60 billion
  • Total sperm/week = 120-150 billion
  • Boars reach puberty at approximately 9 months of age
boar power
Boar Power
  • Boar power needs refer to the number of females that can be mated (serviced) by one boar.
what factors affect boar power
What factors affect boar power?
  • Boar’s age
  • System of mating
  • Frequency of farrowing
boar power continued
Boar Power Continued
  • Actually the number of services per week is a better guide to boar usage (2X/d or 10X/wk)
  • Ratios as high as 20:1 and as low as 4-5:1 are encountered in the swine industry.
  • Certainly the use of AI will greatly increase the number of females bred/boar.
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