Fecundity. Fecundity depends on Absolute numbers of eggs produced Immature eggs present Fixatives and preservatives used Formalin Modified Gilson’s Fluid.

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Presentation transcript:

Fecundity

Fecundity depends on Absolute numbers of eggs produced Immature eggs present Fixatives and preservatives used Formalin Modified Gilson’s Fluid

Gravimetric method Based on weighing and counting of eggs Random samples of about 500 eggs are counted and weighed Total number of eggs in an ovary calculated from the equation F = nG/g where F = Fecundity; n= number of eggs in the subsample; G=total weight of the ovary; g = weight of the subsample.

Volumetric method Cleaned eggs are put in a measuring cylinder made up to a known volume with water Subsample of known volume is again drawn with a pipette Number of eggs in the subsample is counted Fecundity is calculated from the equation F = nV/v Where, n = number of eggs in the subsample V = volume which contain all the total eggs v = volume of the subsample

Automatic egg counter Advantage Error in any sub-sampling technique is avoided Disadvantage Slowness of this machine

Sex Ratio Expected sex ratio is 1:1 in the nature Sex ratio is calculated in the following equation x 2 = ∑ (O – E) 2 / E Where, O – Observed value E – Expected value