Evaluation of Norfa Productive Performance as an Egyptian Synthetic Strain

Abstract

The present study eviocejbo was to investigate the time-lapse factor under the local scientific research environment on the productive performance of Norfa chickens as a locally synthetic strain. Data were collected manually from 62 sources of previous studies from 1987 to 2023, which were done on Norfa chickens during that period. that is about 37 years of study. This period was divided into four decades P 1 (from 1987 to 1996), P 2 (from 1997 to 2006) P 3 (from 2007 to 2016), and P 4 (from 2017 to 2023) to evaluate productive performance (age at sexual maturity (ASM), body weight at sexual maturity (B.W sm ), egg weight at sexual maturity (E.W sm ), body weight at maturity (B.W m ), egg weight at maturity (E.W m ), egg number at 90 d. of production (EN 90 ), egg numbers at 42 w.k. of age (EN 42 ), fertility percent (F%) and hatchability (H%)) for Norfa chickens during the aforementioned period. Limits of some productive traits of Norfa chickens as a synthetic strain were (ASM=141 d., B.W sm =1330.5 gm., B.W m = 1684.5 gm., E.W sm = 41.5 gm., E.W m =55.9 gm., E.N 42 = 86.4 egg, E.N 90 =56.3 egg, F%= 94.75 and H%=86.23). So, it may be concluded from previous inventory that the Norfa strain has distinctive production limits that can compete against the rest of the local breeds. In addition to that, it tolerates local conditions and factors, which makes it suitable for breeding at the narrow level as well as at the commercial level.