L13: Trace Minerals I

Question 1

What is a trace mineral?

Answer 1

Minerals req. in much smaller amounts

Have cooperative action

Question 2

*What is the function of Copper (Cu)?

Answer 2

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

Question 3

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

Answer 3

• 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

Question 4

*List the symptoms of Copper deficiency

Answer 4

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

Question 5

How can you prevent Copper deficiency?

Answer 5

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

Question 6

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

Horses?

Answer 6

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

Question 7

_*What is the function of Iodine?_

Answer 7

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

Question 8

*What are the symptoms of an Iodine deficiency?

Answer 8

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

Question 9

Ruminants require …. ppm Iodine to avoid clinical deficiency

greater than …. ppm can be toxic

feeds req. …. - …. ppm iodine

Answer 9

0.5ppm

50ppm toxic

0.05 - 0.2ppm

Question 10

What is a good dietary source of Iodine?

Answer 10

seaweed