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Related Experiment Videos

Effects of environmental management on seasonal decrease in milk production in dairy cattle

J A Thompson1, M Brimacombe, J A Calvin

  • 1Department of Large Animal Medicine, College of Veterinary Medicine, Texas A&M University, College Station 77843, USA.

Journal of the American Veterinary Medical Association
|January 15, 1999
PubMed
Summary
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Summer heat reduces milk production in Holstein cows. Sprinklers may boost peak production, but fans show no significant effect. Strategic calving can improve overall milk yield.

Area of Science:

  • Dairy Science
  • Animal Husbandry
  • Environmental Physiology

Background:

  • Seasonal variations significantly impact dairy cow productivity.
  • Heat stress negatively affects milk yield and cow well-being.
  • Effective management strategies are crucial for mitigating seasonal production losses.

Purpose of the Study:

  • To evaluate the impact of season on milk production in Holstein dairy cows.
  • To assess the efficacy of fans and sprinklers in managing seasonal heat stress.
  • To identify optimal management practices for maintaining milk production throughout the year.

Main Methods:

  • A longitudinal observational study involving 141 dairy herds.
  • Data collection included production and reproduction records from the Dairy Herd Improvement Association database.

Related Experiment Videos

  • Interviews with owners identified the placement of fans and sprinklers; mixed model ANOVA analyzed the data.

    • Main Results:

    • Summer heat decreased daily peak milk production across all parity groups, with diminishing effects later in lactation.
    • Sprinkler use enhanced peak milk production in parity-1 and parity-3+ cows.
    • Fans did not significantly alter seasonal effects on milk production; 305-day milk production decreased for parity-2 and -3 cows calving in summer.

    Conclusions:

    • Sprinklers show potential for increasing peak milk production and reducing heat stress in high-producing cows.
    • Veterinarians should exercise caution when recommending fans and sprinklers due to wide confidence intervals for effectiveness.
    • Optimizing calving periods for parity-2 and higher cows (October to June) can enhance 305-day milk production.