Monogastric production swine section
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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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Monogastric Production Swine Section

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Monogastric ProductionSwine 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


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

  • 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

  • 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 needs refer to the number of females that can be mated (serviced) by one boar.


What factors affect boar power?

  • Boar’s age

  • System of mating

  • Frequency of farrowing


Boar Power Guidelines


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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