author(s)
K Sangli Vikram Kumar, D Balasubramanyam, R Venkataramanan and H Gopi

abstract
A study was conducted to evaluate the production and reproduction performance of landrace pigs under north-eastern agro-climatic conditions of Tamil Nadu. Data on 1115 animals for the period from 2003 to 2017 were collected from the Pig Breeding Unit, functioning at Postgraduate Research Institute in Animal Sciences, Kattupakkam, Tamil Nadu. Effect of various non-genetic factors on birth weight, weaning weight, litter size at birth, litter size at weaning, litter weight at birth and litter weight at weaning were studied using least-squares analysis. The least-squares mean for the traits were 1.394±0.01 kg, 8.628±0.08 kg, 7.948±0.18, 7.485±0.21, 11.022±0.37 kg, 64.833±1.99 kg respectively. Period had significant influence on all the traits studied. Season was a significant source of variation for birth weight and weaning weight and sex had significant influence only on birth weight. Litter size at birth was maximum in summer season.