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Expected consequences of the segregation of a major gene in a sheep population in relation to observations on the ovulation rate of a flock of cambridge england uk sheep



Expected consequences of the segregation of a major gene in a sheep population in relation to observations on the ovulation rate of a flock of cambridge england uk sheep



Animal Production 51(2): 277-282



A simple model was derived relating the phenotypic effect (g) of a major gene to observed values of the population mean and variance for a trait, at specified values of the major gene frequency and at specified basal values of the population mean and variance (in the absence of the major gene). This model was applied to a total of 549 observed values of ovulation rate in ewes of the Cambridge breed at Bangor under a range of assumptions. The mean values of ovulation rate were 2.44 for 243 ewes of 1 year of age and 3.54 for 306 ewes of 2 and 3 years of age with a coefficient of variation for both age sets of 0.50. The results indicate a minimum value for g, in this data set, of 1.07 for 1 year old and 1.72 for 2 and 3 year old ewes. The results are also consistent with a frequency value in the region of 0.3 to 0.4, with the absence of dominance and with a reasonable concordance with Hardy-Weinburg equilibrium. The results also indicate that the value of g varies according to the background phenotype since it is lower for younger as compared with older ewes.

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