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Incidence of Colostrum in Raw Milk

Jerzy Zawistowski1, Rufina Mackinnon2

  • 1Agri-Food Biotechnology Laboratory, Manitoba Research Council - University of Manitoba, Winnipeg, R3T 2N2.

Journal of Food Protection
|May 23, 2019
PubMed

Insights

A survey found that most raw milk in Manitoba dairies contained colostrum, indicated by high levels of bovine immunoglobulin G (IgG). This suggests widespread colostrum contamination in the milk supply.

Area of Science:

  • Veterinary Science
  • Food Safety

Background:

  • Colostrum, the first milk produced after calving, is rich in immunoglobulins and other nutrients.
  • The presence of colostrum in bulk raw milk can affect milk quality and processing.

Purpose of the Study:

  • To assess the prevalence of colostrum contamination in raw milk from Manitoba dairies.
  • To quantify the levels of bovine immunoglobulin G (IgG) as an indicator of colostrum presence.

Main Methods:

  • A survey of raw milk samples from Manitoba dairies was conducted.
  • Bovine immunoglobulin G (IgG) levels were measured using a radial immunodiffusion assay.
  • Samples were analyzed to determine IgG concentration as a proxy for colostrum content.

Main Results:

  • Out of 360 tested milk samples, 89% showed evidence of colostrum contamination.
  • The majority of contaminated samples (320) had IgG levels between 1.0 and 1.5 mg/ml.
  • A smaller proportion (38 samples) had higher IgG levels (1.5-2.0 mg/ml), with two samples exceeding 2 mg/ml.

Conclusions:

  • Colostrum contamination is prevalent in raw milk supplies from Manitoba dairies.
  • The study quantifies IgG levels, providing a metric for assessing colostrum presence.
  • Findings highlight potential quality and safety concerns related to colostrum in raw milk.

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