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Related Experiment Videos

Relationships between somatic cell counts and milk production.

G M Jones, R E Pearson, G A Clabaugh

    Journal of Dairy Science
    |August 1, 1984
    PubMed
    Summary
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    Higher somatic cell counts in dairy cows are linked to lower milk yield, especially in later lactations. This relationship, analyzed using Dairy Herd Improvement data, shows increased infection rates above 400 X 10(3) cells/mL.

    Area of Science:

    • Dairy Science
    • Animal Health
    • Veterinary Epidemiology

    Background:

    • Somatic cell count (SCC) is a key indicator of udder health in dairy cattle.
    • Understanding the relationship between SCC and milk yield is crucial for herd management and economic viability.

    Purpose of the Study:

    • To analyze the relationship between test-day milk yield and somatic cell counts in commercial dairy herds.
    • To determine how parity and herd production levels influence this relationship.

    Main Methods:

    • Analysis of 67,707 test-day milk yield and SCC observations from 34 dairy herds over 3 years.
    • Transformation of SCC to natural logarithms for more accurate relationship estimation.
    • Partitioning herds by annual milk production and analyzing yield decrease across parities.

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    Main Results:

    • Test-day milk yield decreased significantly with increasing SCC.
    • The negative impact of SCC on milk yield was more pronounced in second and later lactations compared to first lactations.
    • In high-production herds (>7700 kg/yr), the yield-SCC relationship exhibited linear, quadratic, and cubic patterns depending on parity.
    • Infection rates increased substantially with SCC, with higher rates observed above 400 X 10(3) cells/mL.

    Conclusions:

    • Accurate estimation of the milk yield-SCC relationship requires logarithmic transformation of SCC data.
    • Herd management strategies should consider parity and production levels when addressing high SCC and its impact on milk yield.
    • SCC levels above 400 X 10(3) cells/mL are strongly associated with increased udder infection prevalence.