4)A study was conducted to investigate the levels of calcium and growth hormone

Question

4)A study was conducted to investigate the levels of calcium and growth hormone excreted in chicken dung on a major chicken farm. The variances (V) were calculated and are shown below.

Variance

Calcium

Growth Hormone

VP

321.2

95.8

VE

119.7

69.4

VA

107.4

10.1

VD

94.1

16.3

A)Calculate the narrow-sense heritability for both traits (calcium and growth hormone levels).

B)Which trait, if any, will most likely respond to artificial selection?

Variance

Calcium

Growth Hormone

VP

321.2

95.8

VE

119.7

69.4

VA

107.4

10.1

VD

94.1

16.3

Explanation / Answer

A) The narrow sense heritability for Calcium :

                            h2 = VA / VP                                                  {1}

                                              h = heritability

                                             VA = Variation in additive genetic values

   VP =   Variation in phenotypes

h2 = 107.4

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