H. R. MisraSharma, Banshidhar2023-11-212023-11-211989https://krishikosh.egranth.ac.in/handle/1/58102015931.Landrace is more suitable for farm owing to its physical conformation and inherent genetic potential of faster growth at the finishing stage, whereas, Large white Yorkshire being more adaptable to rural condition with comparatively high post-weaning shock tolerance capacities stands ahead of the former for distribution in villages where its halfbreds perform better then Landrace halfbreds. 11. A decrease in magnitudes on pre-weaning body weights and linear body measurements with the increase of litter size at birth seemed to be a decisive factor of considerable importance in selection for phenotypic traits. 111. The lower rate of growth just after weaning in almost all the genetic groups suggested need of special care and management at that stage. 1V. Because of high resistance of weaning shock in halfbreds they excel the exotic over preference for any developmental programme in rural areas. If at all, exotics do not merit such consideration until they have crossed the weaning period at least by over one month. V. A significant superiority in litter size, apart from litter weight at birth and at weaning, is an additional advantage in economic traits by crossing of Desi sows with exotic boars over indigenously bred sows with Desi male.EnglishThesis