1. Hatchability of fertile eggs incubated with their small ends up (SEU) was 16 to 27% lower than for eggs set with their large ends up (LEU). In addition, the SEU position produced more non‐viable chicks. 2. There were no differences in post‐hatching performance between the two incubation treatments. 3. A survey in a commercial hatchery revealed that the frequencies of eggs set upside down by mistake varied from 0.3% to 3.4%. The setting of eggs upside down was attributed not to difficulties in distinguishing the large and small ends of of the eggs but to human error. A decrease in the number of Grade‐A chicks of about 0.2% was observed for every 1% of eggs set upside down, suggesting it may be of economic importance to ensure that the eggs are set properly with their large ends up.

Effects of setting eggs small end up on hatchability and posthatching performance of broilers.

Relationship of Egg Position During Incubation on Early Embryonic Growth and Hatching of Broiler Breeder Eggs

The Effects of Sperm Number and Insemination Interval on the Fertility and Hatchability of Sentul Hens

Position and Turning of Turkey Eggs During Storage Prior to Incubation

In this study, the effects of flock age and storage length on hatching results in Japanese quails were investigated. (Coturnix coturnix japonica). The effects of flock age (8, 12, 18, 25 and 30th weeks) and storage duration (0, 1, 4 and 7th days) were investigated. Fertility decreased with increasing flock age (P<0,01). In addition, early embryonic mortality, hatchability of total and fertile eggs was only significantly affected by flock age. Examined levels of the storage duration had no significant effect on the examined hatching parameters.

Flock age and duration of hatching egg storage in Japanese quails: 2. Effects on hatching results.

Some Factors Affecting Hatchability of Chicken Eggs

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Some Factors Affecting Hatchability of Chicken Eggs