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Transition Management in Grazing Systems: Pragmatism Before Precision.

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  • 1School of Biological Sciences, University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.

The Veterinary Clinics of North America. Food Animal Practice
|May 10, 2023
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Summary

Grazing cows experience metabolic stress and immune issues similar to housed cows, but managing their nutrient intake is harder due to variable feed quality and weather. Pragmatic management of body condition score during mid- and late-gestation is key for a smooth transition.

Keywords:
Body condition scoreDietary cation–anion differenceMagnesiumPasture

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Area of Science:

  • Animal Science
  • Ruminant Nutrition
  • Dairy Cattle Physiology

Background:

  • Grazing dairy cows face metabolic stress and immune challenges comparable to high-yielding housed cows on total mixed rations.
  • Nutrient intake management in grazing systems is less precise due to daily variations in feed quality and weather impacts.
  • Transition cow management in grazing systems often relies on pragmatic approaches rather than strict precision.

Purpose of the Study:

  • To compare the metabolic and immune status of grazing cows with housed cows.
  • To highlight the challenges in managing nutrient intake for grazing cows.
  • To emphasize the importance of body condition score management during critical gestation periods for grazing cows.

Main Methods:

  • Comparative analysis of metabolic stress markers in grazing versus housed dairy cows.
  • Assessment of immune dysregulation in both management systems.
  • Evaluation of factors influencing daily nutrient intake variability in grazing environments.

Main Results:

  • Grazing cows exhibit similar metabolic stress and immune dysregulation to housed, high-yielding cows.
  • Daily nutrient intake management is significantly less controlled in grazing systems.
  • Feed quality fluctuations and weather conditions substantially affect feed consumption in grazing cows.

Conclusions:

  • Pragmatic management strategies are essential for transition cow health in grazing systems.
  • Effective management of body condition score during mid- and late-gestation is crucial for successful transitions in grazing cows.
  • Understanding the unique challenges of grazing systems is vital for optimizing dairy cow health and productivity.