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The present investigation was carried out on six crossbred chicken populations to estimate variability of microsatellites and their association with growth and other traits. Five microsatellite markers located on chromosome , , and were screened and association study was performed following general linear model technique. All the microsatellites were polymorphic showing three to six alleles. The polymorphic information content (PIC) of the markers was more than . . Genotype and allelic frequency was estimated showing a large variability from microsatellite to microsatellite. The genotypes of microsatellite were found to be significantly ( . ) associated with body weight at day old, , , , and week of age. A significant association between microsatellite and body weight at , and week of age was estimated at . in di erent crossbred chicken populations. genotypes were observed to be significantly associated with body weight at weeks of age. and microsatellites were found to be significantly correlated with age at sexual maturity whereas humoral immune response to sheep RBC were observed to be non-significantly associated with the microsatellites.

The karyology of Necrobia ruficollis F. and Necrobia rufipes De Geer was investigated. The male karyotype of the species is 18♀:8+Xyp. Details of structure and behaviour of chromosomes during cell division are presented. Variations in the morphology of chromosomes in Necrobia species and trends in the evolution of karyotypes in the Cleridae are discussed.Key words: Cleridae, karyotype, sex chromosome mechanism, polyphaga, pericentric inversion.