Solanki, J. V.Joshi, Rajesh Kumar S.2018-07-182018-07-181990http://krishikosh.egranth.ac.in/handle/1/5810060657A study on genetic aspects o£ Perfomance Efficiency Index (PEI) on the basis of corrected body weight differences at various stages of production for differences in body weight at 20th week were carried out using 207 pedigreed pullets belonging to 25 sire families of M line WLH birds. The average PEI (%) at 28 weeks and at subsequent 4 week interval upto 56 weeks of age were 27.48± 0.74 %; 36.79±0.51 %; 36.56±0.53 %; 37.83±0.56 %, 36.53±0.60 %; 30.65±0.72 %; 36.45±0.62 % and 32.17± 0.64 % respectively. The same for average NFEI (%) were 34.07±0.71 %, 43.05±0.56 %7 42.92±0.59 %; 44.23±0.59 %; 40.96±0.60 %; 33.94±0.76 %; 39.54±0.70 % and 36.88±0.70 %; respectively. The average CPEI (%) were 27.61±0.77 %; 36.78±0.52 %; 36.62±0.56 % and 37.82±0.58 % at 28, 32, 36 and 40 weeks of age respectively.enA STUDYThesis