author(s)
Akhilesh Pandey

abstract
The study was carried out on the data of pigs breeding farm spread over a period of 20 years from 1982 to 2001 belonging to three genetic groups viz. Landrace, Desi (local-non descript) and their half breeds maintained and it was found that Genetic group had a significant effect on the mortality particularly up to 1^st two weeks of ages and non-significant thereafter up to 8^th weeks of ages. Significantly highest mortality was observed in Landrance than LR x D and desi (local-non descript) during first two weeks. The whole data were grouped in to 4 seasons on the basis of climatological data viz., winter (December to February-cold), summer (March to May-dry-hot), Rainy (Jun to August-hot humid)and autumn (September to November-moderate) and the Seasons of farrowing had significant influence on piglets mortality during 0-1, 1-2, 0-2 and 0-8 week of age, but it had non-significant influence during 2-8 weeks of age. The season should have in fact its effect on newly born Piglets upto 2^nd week of age as seen in the present study. Parity had non-significant influence on pre-weaning mortality rate in the present study.