Comparison of hatching weight loss of egg from different parents stocks of Linnan yellow broiler

This study was conducted to compare the hatching weight loss of yellow chicken eggs among the five parents stocks. The eggs from five parents stocks of Linnan yellow broiler（ rapid growth，middle growth，slow growth，mahuang，aijiaohuang） were used in this experiment. The results showed that the average range of weight loss from the five parents stocks at 1-6 stages（3 days as one stage） and 0-18 days was 1.859%±0.047-2.039% ±0.044%，1.584%±0.027-1.981%±0.056%，1.927%±0.037-2.266%±0.067%，1.764%±0.053-2.216% ±0.062%，1.865%±0.036-2.259%±0.059%，1.849%±0.057-2.271%±0.064%，10.571%±0.176-12.296% ±0.301% under the following conditions： the temperature of incubator and hatchertray machine was 37.8℃ and 36.8℃respectively，the relative humidity of incubator and hatchertray machine was 56% and 65% respectively. In the same stocks and egg weight range，the incubation stage only affect weight loss rate in some cases and the weight loss rate of the second stage was significantly lower. In the same stocks and hatch stage but different egg weight ranges， the weight loss rate of slow growth type was different among the smallest，the smaller，the relative smaller eggs， others were not different. In addition，the egg weight loss rate of 0-18 days decreased with egg weight increasing of 4 stocks while the yellow dwarf chicken was opposite. In the same hatch stage and egg weight range，the effect of stock on weight loss rate in 0-18 days was not significant.