L14: Trace Minerals II Flashcards Preview

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Flashcards in L14: Trace Minerals II Deck (16)
1

*What is the function of Selenium (Se)?

  • Se acts w/ VE to protect body tissue from oxidation
  • is part of glutathione peroxidase enzymes
    -help prevent oxidative degradation of lipids
  • part of selenoenzymes responsible for conversion of T4 to T3 and for correct sperm development
  • Maintenance of immune function
  • Variable absorption, low in ruminants

2

*What are the clinical symptoms of a Se deficiency?

  • Nutritional muscular dystrophy (white muscle disease)
    -stiffness, abnormal heartbeat
  • Repro disorders
  • Lowered disease resistance
    -susceptibility to mastitis
  • Adipose tissue inflamm (yellow fat disease)

3

*What are the subclinical symptoms of an Se deficiency?

  • lower growth or unthriftness
  • Lower lamb survival and weights
  • lower wool production

4

What are the Se deficiency levels of:

Sheep?

Cattle?

Horse?

  • sheep <0.1 um/L serum
  • cattle <0.5 um/L serum
  • horse same as cattle

5

Se aids VE in:

  • normal absorption
  • retention
  • reduces amount req. to maintain lipid integrity

6

VE aids Se in:

  • staying in its active form
  • preventing loss

7

What are some good dietary sources of:
Se?

VE?

  • Se -most forages adequate
  • VE -green forage, hay, cereal grain

8

How can you prevent Se deficiency?

  • 1-3 monthly injections
  • Se in lick blocks
  • Se bullets

9

*What is the function of Iron (Fe)?

How can deficiency occur?

  • essential constituent in molecules and enzymes for )2 transport and use
  • def. can occur w/ blood loss = anaemia
  • excess stored in liver, though excess can reduce immunity to bacterial infections

10

*What is the function of Zinc (Zn)?

 

  • VA metabolism
  • gene expression
  • FA metabolism
  • membrane composition and stability
  • appetite reg
  • absorbed according to need
  • stored in bone, muscle and wool

11

*What are the clinical symptoms of a Zinc deficiency?

  • loss of appetite and anorexia
  • skin thickening
  • excessive salivation
  • skeletal disorders
  • hypogonadism
  • reduced spermatogenesis
  • reduced lamb survival and increased pregnancy toxaemia
  • impaired immune function

12

*What is the function of Cobalt (Co)?

  • Required for VB12 synthesis in rumen
  • Methylcobalamin (MeCbl) acts as a methyl donor for 1st C metabolism
    -methane, acetate, methionine synthesis
    -formaye, noradrenaline, myelin synthesis
  • Adenoslycobalamin (AdoCbl) for proprionate synthesis

13

*What are the symptoms of a Cobalt deficiency?

  • Failed proprionate metabolism
    -reduced appetite and glucose synthesis
  • Failure of methylation
    -impaired methionine metabolsim
  • Abnormal lipid metabolism
  • Clinical symptoms:
    -anorexia
    -anaemia
    -fatty liver
    -high perinatal mortality
    -increased suscept. to disease
    -infertility

14

High ... depresses Co uptake

Mn

15

How can you prevent Co deficiency?

  • Co fertilisers
  • Co supplements
  • Co bullets

16

List some other trace minerals

  • Manganese
  • Fluorine
  • Molybdenum
  • Silicon
  • Chromium
  • Vanadium
  • Nickel
  • Tin
  • Arsenic
  • Boron
  • Lithium