Nationalities,Chengdu 610041,P.R.C.)
The paper aims to discuss the effects of egg-shaped indexes on hatching results and the difference of hatching rates for Roman Pink breed hens with different ages,and to provide some references for better hatching results.1200 eggs from Roman Pink breed hens with 150-day and 300-day ages are divided into 5 groups,and are hatched with the same temperature.The results show that egg-shaped indexes for Roman pink breed hens with different ages do not have effects on fertilization rates,their differences are not significant.(P0.05),but their effects are significantly different on hatching rates when the egg-shaped indexes are between 0.71and 0.85(P0.05),but hatching rates are not significantly different when the egg-shaped indexes are more than 0.85 or less than 0.71(P 0.05).The hatching rates for 300-day hens are better than those for 150-day hens.The egg shape index does not affect the egg fertilization rate,the differences are not significant(P 0.05).Thus,the effects of egg-shaped indexes are on hatching rates,but are not on fertilization rates.