Graduate Thesis Or Dissertation
 

Genetic parameters of the house fly (Musca domestica Linn.)

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  • Eight strains of housefly, Musca domestica Linn., from two laboratories were intercrossed to form a stock population. Virgin males and females from the stock were collected, and nine sets, each consisting of twelve males mated to five females, were successively done. Pupae weight, adult weight, emergence time and egg production of the first batch were measured on four male and four female offspring from each of two dams mated to the same sire. Analyses of variance and covariance were made, and the heritability for each trait and genetic and phenotypic correlations among the traits were estimated. Heritability estimates of pupae weight and adult weight, 0.32 ± 0.24 and 0.34 ± 0.19 respectively, are reasonable considering that they are growth traits and are comparable with similar estimates in some other organisms. Heritability of the emergence time, 0.72 ± 0.30, was high. Heritability of egg production was considered to be zero and was low when compared with estimates of egg production in the fowl. Extimates of genetic correlations between pupae weight and adult weight, between pupae weight and emergence time, and between adult weight and emergence time were 0.91, 0.50, and 0.62, respectively. Genetic correlations between egg production and the other traits cannot be estimated in this experiment. Phenotypic correlations were 0.86, 0.03, 0.09, 0.05, 0.08, and -0.09 for between pupae weight and adult weight, between pupae weight and emergence time, between pupae weight and egg production, between adult weight and emergence time, between adult weight and egg production, and between emergence time and egg production, respectively. Selection index has been proven to be a very effective method in selection. Selection indexes were: I = -0.0504Y₁ + 0.7651Y₂ + 0.1969Y₃ + 0.0050Y₄ for all four traits and I = -0.0438Y₁ + 0.7648Y₂ + 0.1959Y₃ for the first three traits where Y₁, Y₂, Y₃ and Y₄ denote measurements of pupae weight, adult weight, emergence time, and egg production, respectively. The findings from this experiment can serve as fundamental information for subsequent selection studies in this population.
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