title: Effects of setting eggs small end up on hatchability and posthatching performance of broilers.
abstract: 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 nonviable 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 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.
authors.affiliation: Poultry Science Department, West of Scotland College, Auchincruive, Ayr.
authors.forename: F
authors.initials: F
authors.lastname: Bauer
authors.forename: S G
authors.initials: SG
authors.lastname: Tullett
authors.forename: H R
authors.initials: HR
authors.lastname: Wilson
mesh_terms: D000818:Animals; D001835:Body Weight; D002642:Chick Embryo / Q000254:growth & development*; D002645:Chickens / Q000254:growth & development*; D005260:Female; D008297:Male; D009026:Mortality; D012727:Sex Characteristics