The objective of this study was to evaluate the effect of two selected generations and the weight of Noi crossbred laying hens on their reproductive performances. The experiment was carried out on 60 Noi laying hens and 1,625 eggs contained 977 eggs from generation G0 and 648 eggs from G1. In addition, the weight of Noi crossbred laying hens was divided into 2 groups, 1.15-1.55 and 1.60-1.90kg, respectively. The results showed that the final weight and average hatching time on the G0 generation (1.99kg and 21.36 days) were significantly higher than G1 (1.74kg and 20.38 days). Moreover, egg weight, percentage of eggs with embryos, and hatching rate, as well as the survival rate of chicks in G1, were all very significantly higher than in G0, while the two groups of hen weights were not found to be statistically significant differences. From the above research results, it can be suggested that the selected laying hens in the G1 generation improve the egg weight, the rate of eggs with embryos and hatchability, and the weight and survival rate of chicks after hatch.

Keywords: Generations, hen weight, reproductive performances of Noi crossbred laying hens.