Does dry-period nutrition affect colostrum quality?

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To find out, University of Illinois researcher Jim Drackley set out to answer the following questions:

  • Does dry-period nutrition affect colostrum quality or yield?
  • Does dry-period nutrition affect the size and viability of the calf?
  • Does maternal nutrition influence subsequent metabolic or production responses in the offspring?

By analyzing data from existing studies, Drackley determined that:

  • Dry-period nutrition does not affect colostrum quality or yield in cows. Neither colostral IgG nor production levels varied significantly in two studies that compared cows fed various dry-period rations. Supplementation of dry-period rations with vitamins A and E, does, however, increase the content of those important vitamins in colostrum.
  • Under reasonable nutritional management of dry cows, maternal nutrition will have little impact on calf size. However, recent research shows that a close-up diet enhanced with either additional energy or fat resulted in larger calves than in cows fed a single-group, controlled-energy diet.
  • Under reasonable nutritional management of dry cows, maternal nutrition will have little impact on calf viability in-utero. However, over-fat cows are more susceptible to dystocia, which has been proven to suppress calves’ absorption of colostral IgG, and leave them susceptible to a host of other health and performance impairments.
  • To date, results are inconclusive regarding the long-term performance of offspring whose dams were fed a higher plane of late-lactation nutrition. Drackley does believe, though, that results from other species indicate that enhanced in-utero nutrition could permanently impact future performance in offspring through DNA programming. He intends to pursue this question with further research.

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