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[Cobalt supply to ruminants, a bottleneck?]

A Malestein1

  • 1V.o.f. Veevoeding Adviesbureau V.A.B., Voorthuizen.

Tijdschrift Voor Diergeneeskunde
|November 15, 1995
PubMed
Summary

Dairy cows with poor condition and low milk yield were found to have a vitamin B12 deficiency linked to cobalt availability. Supplementation improved milk production and animal health, suggesting a dietary imbalance.

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Area of Science:

  • Agricultural Science
  • Animal Nutrition
  • Veterinary Medicine

Background:

  • Cobalt is essential for ruminant health, particularly for vitamin B12 synthesis.
  • Inadequate cobalt levels can lead to poor animal health and reduced productivity in dairy cattle.
  • Observed poor condition and low milk yield in dairy cows despite adequate soil and ration data.

Purpose of the Study:

  • To investigate the cause of poor dairy cow performance on certain farms.
  • To determine the effect of cobalt supplementation on milk production and animal health.
  • To explore potential factors affecting cobalt bioavailability in dairy rations.

Main Methods:

  • Monitoring milk yield, animal condition, and milk lactose content.
  • Administering cobalt supplementation (5.5 mg/day) to affected dairy cows.
  • Analyzing feed composition, specifically grass silage, for nutrient content.

Main Results:

  • Cows receiving cobalt supplementation showed improved condition and increased milk yield.
  • Milk lactose content increased to above 4.5% after cobalt supplementation.
  • Supplemented animals exhibited increased dry matter intake.
  • A potential link between high potassium in grass silage and reduced cobalt availability was observed.

Conclusions:

  • Cobalt supplementation can effectively address vitamin B12 deficiency in dairy cows experiencing poor performance.
  • High potassium content in grass silage may impair cobalt bioavailability, warranting further investigation.
  • Optimizing cobalt supply is crucial for maintaining dairy herd health and productivity.

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