L13: Trace Minerals I Flashcards Preview

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Flashcards in L13: Trace Minerals I Deck (11)
1

What is a trace mineral?

Minerals req. in much smaller amounts

Have cooperative action

2

*What is the function of Copper (Cu)?

  • Enzyme activator for:
    -repro
    -bone dev.
    -growth
    -connective tissue dev.
    -pigmentation
    -PROTECTION FROM OXIDATION
    -heart and CNS dev
    -immunocompetence
  • Haemoglobin synthesis (mobilises Fe)

3

Copper absorption is affected by soil levels and Cu antagonists.
Name these antagonists and how they affect Cu absorption

  • Mo
    -reduce absorption
  • S
    -decrease soluble Cu in rumen
  • Fe
    -forms insoluble mixed Fe and Cu sulfides and reduced hepatic Cu uptake
  • Zn
    -excess results in Zn metallothionein

4

*List the symptoms of Copper deficiency

  • Anaemia
  • Bone disorders
  • Connective tissue disorders
  • Swayback
  • Cardiovascular disease
  • Depigmentation
  • Defective keratinisation
  • Infertility
  • Growth retardation

5

How can you prevent Copper deficiency?

  • Cu fertilisers
  • Licks containing Cu
  • Cu in water
  • Cu bolus

6

What are the Copper requirements of:
lactating ewe?
lactating cow?

Horses?

  • ewe 1.2mg/day
  • cow 6mg/day
  • horse 10mg/kgDM

7

*What is the function of Iodine?

  • Component of thyroid hormones T3 and T4
    -These hormones increase metabolic rate
  • Involved in:
    -foetal development
    -immune defence
    -digestion
    -muscle function
    -repro

8

*What are the symptoms of an Iodine deficiency?

  • Both an excess and def icrease thyroid stimulating hormone (TSH) secretion
    -results in thyroid gland hypertrophy (goitre)

9

Ruminants require .... ppm Iodine to avoid clinical deficiency

greater than .... ppm can be toxic

feeds req. .... - .... ppm iodine

0.5ppm

50ppm toxic

0.05 - 0.2ppm

10

What is a good dietary source of Iodine?

seaweed

11