This means the heart will have to work hard to support fast growth on the farm. Do NOT operate the incubator in direct sunlight or near heat sources such. Too much heat reduces heart size relative to body weight. The room should be free from drafts and have an ambient temperature between 68F77F. ![]() But, high temperature also affects the growth and development of many internal organs, especially the heart. A room temperature from 70-80 degrees is ideal, with fresh air and no drafts. So, high embryonic temperatures during incubation accelerate embryo development, causing chicks to hatch early with large residual yolk sacs. In another trial, chicks were examined immediately after take-off and those on the control treatment (eggshell temperature of 37.8 C) had bigger hearts, gizzard, and small intestines as a percentage of yolk-free body weight and a lower residual yolk weight than those incubated on the two hotter treatments. The results showed the treatment of 37.8 C throughout the incubation period resulted in better hatchability and a higher percentage of first quality chicks (fewer red hocks and poor navels), higher broiler weight and better livability compared to the higher temperature treatments (Figures 2 a, b, c). After hatch, we evaluated the chicks and grew them on our research farm. From 11 days of incubation through to transfer at 18 days, the eggs were incubated with an eggshell temperature of either 37.8 C, 38.1 C, or 39.4 C. Incubator conditions were changed as necessary to maintain the desired eggshell temperature.ĭuring the first 10 days of incubation, all the eggs were incubated with a target eggshell temperature of 37.8 C. The results reported here were from the conventional Aviagen broiler product, in the second trial.Įgg shell temperatures were recorded using Gemini data loggers feeding to a wireless broadcast system that could be interrogated in real time. Three consecutive trials were run, using two Aviagen breeds, including a high-breast-meat-yield chicken, and a competitor strain, to investigate the impact of raised incubation temperature on hatch, chick quality and broiler performance. indicate the effects of incubating eggs too hot. The results of trials conducted at the Aviagen product development center in the U.S. Set-point temperatures should also be reduced gradually farther in the hatcher. The best target egg shell temperature appears to be 37.8 C (100.0 F) from the beginning of incubation to time of transfer of the eggs to the hatcher. ![]() It is best not to think in terms of your set-point temperature program, but to adjust your set points based on the egg shell temperatures you actually measure daily. So, in the second half of the incubation period, it becomes important to gradually reduce the set point of the machine in order to prevent embryos from becoming too hot. ![]() It is not unusual for eggshell surface temperatures to be 0.2 C higher than the surrounding air. This heat has to be lost into the environment if embryo temperatures are to remain within comfortable limits (Figure 1). After nine days of incubation, embryos become more active and heat production rises daily.
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