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Related Experiment Videos

Hematologic values in newborn beef calves.

R Adams1, F B Garry, B M Aldridge

  • 1Department of Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Colorado State University, Fort Collins 80523.

American Journal of Veterinary Research
|June 1, 1992
PubMed
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Hematologic values in beef calves change significantly over time. Early detection of disease in calves is possible through specific hematologic markers, even before clinical signs appear.

Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Hematology

Background:

  • Hematologic parameters are crucial for assessing bovine health.
  • Understanding normal hematologic changes in beef calves is essential for disease diagnosis.
  • Early identification of disease can improve calf survival rates.

Purpose of the Study:

  • To characterize hematologic value changes in healthy beef calves over time.
  • To identify hematologic differences between healthy and diseased calves.
  • To determine if hematologic markers can predict disease in calves before clinical signs are apparent.

Main Methods:

  • Hematologic values were measured in 35 beef calves at birth, 24 hours, 48 hours, and 3 weeks.
  • Calves were categorized as healthy or diseased based on clinical signs at 3 weeks.

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  • Statistical comparisons were made between healthy and diseased groups at each time point.

    • Main Results:

    • Significant changes over time were observed in hematocrit, RBC count, hemoglobin, MCV, MCHC, WBC count, neutrophil-to-lymphocyte ratio, total protein, and immunoglobulin concentrations in healthy calves.
    • Diseased calves showed significant differences in band neutrophil count and neutrophil-to-lymphocyte ratio at birth compared to healthy calves.
    • Elevated monocyte counts were noted in ill calves at 24 hours, and higher total leukocyte, mature neutrophil, monocyte counts, and neutrophil-to-lymphocyte ratios were observed at 48 hours in ill calves.

    Conclusions:

    • Hematologic values in beef calves exhibit dynamic changes from birth to 3 weeks.
    • Specific hematologic markers, including neutrophil-to-lymphocyte ratio and monocyte counts, can indicate subclinical disease in calves.
    • Hematologic profiling offers a valuable tool for early disease detection in beef calves, potentially improving outcomes.