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Related Experiment Videos

Changes in milk composition as affected by subclinical mastitis in sheep.

G Leitner1, M Chaffer, A Shamay

  • 1National Mastitis Reference Center, Kimron Veterinary Institute, Bet Dagan 50250, Israel. leitnerg@int.gov.il

Journal of Dairy Science
|February 10, 2004
PubMed
Summary

Subclinical mastitis in dairy sheep significantly reduces milk yield and curd yield. Infected glands show higher somatic cell counts and enzyme activity, impacting milk composition and overall production.

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Area of Science:

  • Veterinary Medicine
  • Animal Science
  • Dairy Production

Background:

  • Subclinical mastitis, an inflammation of the mammary gland, affects dairy animal productivity.
  • Understanding the precise mechanisms of mastitis impact on milk composition is crucial for dairy management.
  • Coagulase-negative staphylococci are common mastitis pathogens in small ruminants.

Purpose of the Study:

  • To investigate the effects of subclinical mastitis on milk yield and composition in dairy sheep.
  • To elucidate the biochemical changes in infected mammary glands.
  • To assess the impact on curd yield, a key indicator of milk processing quality.

Main Methods:

  • Comparative analysis of infected versus uninfected udder halves in Israeli-Assaf dairy sheep.

Related Experiment Videos

  • Measurement of milk yield, somatic cell count, and N-acetyl-beta-D-glucosaminidase activity.
  • Assay of plasminogen activator, plasmin, plasminogen activities, and proteose peptone concentration.

    • Main Results:

    • Milk yield was significantly lower in infected halves (0.36 kg/milking) compared to uninfected halves (0.76 kg/milking).
    • Infected glands exhibited higher somatic cell counts, N-acetyl-beta-D-glucosaminidase, plasminogen activator, plasmin activities, and proteose peptone concentration.
    • Plasminogen activity and the plasminogen:plasmin ratio were lower in infected glands, alongside reduced curd yield.

    Conclusions:

    • Subclinical mastitis caused by coagulase-negative staphylococci significantly impairs milk yield and curd yield in dairy sheep.
    • Biochemical alterations in infected glands, including enzyme activity changes and increased proteose peptones, contribute to reduced milk quality.
    • These findings highlight the economic impact of subclinical mastitis on dairy sheep farming.