Parent stocks (PS) of exotic hybrids have contributed immensely to commercial poultry production in Nigeria. Their continued optimal utilization depends on their performance test.Information on performance indices of PS layer breeds in South-West Nigeria is however limited. The growth, reproductive performance and seasonal sensitivity of Bovan Nera (BN) and Isa Brown (IB) hybrids were evaluated.
Secondary data on 24 batches of PS of each of BN and IB kept over a period of 10 years (1999-2008) in Ajanla Farms, Ibadan were used. Average batch population was 3896 pullets and 600 cockerels at point-of-lay. Records on Body Weight (BW), Age, Hen-Day-Production (HDP),Egg Weight (EWt), Egg fertility (EF), Egg Hatchability (EH), Pullet Day-Old Chicks produced(PDOC) and Hatching Rejects (HR) in four seasons: Early-Wet (EW, April-July); Late-Wet(LW, August-October); Early-Dry (ED, November-January) and Late-Dry (LD, February-March) were obtained. Data were standardized and analysed for growth, Age-at-first-egg(AFE), HDP characteristics, reproduction, seasonal sensitivity, genotype-season interaction using descriptive statistics, ANOVA, correlation and regression (p=0.05).