Mastitis Bovina: Sintomatología Clínica

Main ideas and concepts (clinical symptoms and classification of bovine mastitis)

Context and goal of the video

• This video continues a series on the bovine mammary gland, with a focus on bovine mastitis.
• It explains how mastitis is classified clinically and what symptoms appear in each form.

How mastitis is classified

Mastitis can be classified based on whether symptoms are visible externally:

1. Asymptomatic mastitis (subclinical mastitis)
2. Clinical mastitis (with visible symptoms)

Clinical mastitis has three presentations:

• Acute
  • Can be mild, moderate, or severe
• Hyperacute (also called toxic mastitis)
• Chronic

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Subclinical mastitis

Definition

• Infection is present in the udder, but there are no visible external signs of disease.

Key internal marker

• Somatic cell counts increase in milk, because somatic cells proliferate in response to microorganisms reaching the udder.

Progression risk

• In the short term, inflammation can develop visible signs, meaning it may progress from subclinical to clinical mastitis.

Common causative bacteria (as stated)

• Streptococcus spp.
• Staphylococcus spp.

Epidemiology/contagion (as described)

• Mastitis testing showed high contagion rates across consecutive tests in subclinical somatic mastitis.

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Clinical mastitis: general notion and impact

What it involves

• Visible inflammation of the mammary gland
• Can be felt on touch
• Abnormal milk, such as:
  • clots/flocculum (“clots”)
  • possible blood

Consequences

• Reduced milk yield and quality
• Possible swelling/redness and pain
• In some cases, systemic signs: fever, anorexia, and even death

Economic importance

• Losses can be imperfectly recognized by farmers because effects may be subtle.
• Figures referenced in the video suggest that subclinical/persistent forms (including “uterine” mastitis, as mentioned) can be economically significant.
• It also notes relative frequency and economic weight, with the idea that a clinical form may be more economically important due to frequency.

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Detailed symptomology (clinical presentations)

1) Acute clinical mastitis

Timing

• Can occur any time during lactation, but is more frequent early postpartum.

Onset

• Either:
  • Sudden onset, or
  • Exacerbation of a chronic case

Subtypes

• Mild acute

  • Sudden onset
  • Visible milk changes
    • Clumps or flocculum (“clots”)

• Moderate acute

  • Gland inflammation
  • Slight redness and edema
  • Hot to the touch
  • May involve one or more quarters

• Severe acute

  • Inflammation causes the gland to harden
  • Becomes painful
  • Milk secretion decreases
  • Milk may appear like blood serum

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2) Hyperacute clinical mastitis (toxic mastitis)

Cause type (as stated)

• Produced by coliform bacteria (the text includes examples/unclear names referencing coliform-related organisms).

Local signs

• Affected area becomes:
  • hot
  • swollen
  • inflamed
• Milk secretion stops completely
• Only a small amount of colored fluid comes out
• In affected quarters:
  • bluish or gangrenous areas
  • bloody exudate from destroyed tissues

Systemic signs

• Fever
• Anorexia
• Depression
• Dehydration
• In severe cases:
  • signs of toxins → hence the name “toxic mastitis”
• May progress to death

Differential diagnosis warning

• Because it occurs postpartum and involves severe toxicity, it can be confused with other postpartum conditions.
• The video emphasizes the need for a careful clinical examination to differentiate it from:
  • body condition issues
  • hypocalcemia
  • milk fat/fiber deficiency (as phrased in subtitles)
  • ketosis
  • other conditions

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3) Chronic clinical mastitis

Problem definition (as described)

• Often diagnosed when clinical history is unknown.
• Clear separation of acute vs chronic is difficult because:
  • Acute flare-ups can occur in chronic cases
  • Acute mastitis can persist long enough to become chronic

Typical features

• Hardening and swelling of the gland
• Tissue edema may occur

Most characteristic sign

• Continuous or intermittent watery residual milk with:
  • clumps
  • blood clots

Diagnostic criterion mentioned

• Chronic cases are described as those with:
  • more than three California Mastitis Tests (CMT / “California Mastitis Tests”)
  • showing high somatic cell counts

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Actions and communication mentioned at the end

• Subscribe to the channel to share information about mastitis and cattle.
• Enable notifications if the viewer likes the video.
• Follow/share via social media:
  • Instagram
  • Facebook
• A contact phone number in Venezuela is referenced (subtitles include: “Grant’s and Joker’s,” likely a mis-transcription).

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Speakers / sources featured

• Mario Rivera Nieves (host/speaker)
• Channel name referenced: “Consulta Urina”