Consequences of lactation for reproductive parameters of sows and cattle

8 important questions on Consequences of lactation for reproductive parameters of sows and cattle

What can you do at weaning management to prevent sows from lactational related fertility problems?

  • Change lactation length
  • Lower number of piglets
  • Split weaning
  • Intermittent suckling

Why research on intermittent suckling in sows?

Looking for the possibility to have lactational oestrus. And extending weaning period.

What can be a reason for ovulation during lactation to fail in sows?

  • No follicle growth due to limited pulsatile secretion of LH
  • Cystic follicles due to failure to mount LH surge
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Why do cows have a long calving interval?

  • Pregnancy takes a long time (270-280 days)
  • Show no heat
  • Long period to first ovulation

Increase of LH pusatility during resumption of cyclicity of cow dependent on:

  • Declining NEB
  • Dry matter intake
  • BCS at calving
  • health status
  • calf presence

How does NEB affect fertility in cows?

The hormones that are produced when a cow is in NEB status are affecting the ovaries (quality of the eggs), uterus and the hypothalamus/pituitary gland.

Which reproductive parameters are affected by lactation in cows?

  • Days post partum to first ovulation
  • Estrus behaviour
  • Irregular oestrus cycles
  • Nr of inseminations per calving
  • (Embryo mortality)
  • Calving interval

Which reproductive parameters are affected by lactation in sows?

  • Estrus and ovulation
  • Farrowing rate
  • Weaning to estrus interval

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