A 3x3 complete diallel experiment was carried out involving indigenous rabbit of Meghalaya(I), and Soviet Chinchilla(SC) and New Zealand White(NZW) breeds of rabbit. Data on post weaning average body weight gain were analysed by complete diallel analysis as per Griffing(1956). The data were first corrected for significant effects of season of birth and sex of animal using the least squares constants(Harvey, 1975). The variations due to GCA as well as SCA were highly significant for all the post weaning growth periods. However, reciprocal effect was not found significant indicating absence of maternal effect. The GCA effect was found to be positive and considerably high for SC and NZW and negative for Indigenous. The crosses of two pure breeds viz., NZW and SC with Indigenous rabbit had positive and high SCA effect. The investigation under report shows positive GCA effect in the two pure breeds, NZW and SC, in respect of post weaning growth performance upto 90, 120 and 150 days of age. This was in contrary to the negative GCA effect in Indigenous rabbit. The results suggested that growth performance of the pure breeds NZW and SC far excel the Indigenous rabbit. NZW and SC when crossed with Indigenous showed positive SCA effects for the above referred traits. On the basis of the findings, crossbreeding of indigenous with NZW as well as with SC was advocated. The reciprocal effect was not found to be significant for growth performance. Therefore, use of separate male and female lines in any crossbreeding programme may not accrue additional advantage.