33 33 LOHMANN TIERZUCHT › MANAGEMENT GUIDE SETTER LATER MORTALITY, 13 – 16 DAYS › › Improper incubation temperature: follow recommended incubation, not too warm and not too cold. › › Improper eggs turning: control turning functions for eggs. This is especially im- portant in the first 15 days of the process. › › Improper ventilation: increase ven- tilation and control carbon dioxide (CO2) value; if location is high above sea level then add oxygen. › › Inherited low hatchability, poultry disease: check genetic potential; test for diseases in flocks; make use of medi- cal care; check health; investigate fac- tors under veterinarian action. Contamination: › › Micro cracks and bacteria contami- nation: handle eggs gently and control eggshell quality of transport eggs; check cleanness of nests and conditions of the Malformed brain exposed: › › Brain exposed: high temperature in the first 9 days of incubation. › › Micro cracks and bacteria contami- nation: handle eggs gently and check eggshell quality of transport eggs; check cleanness of nests and conditions of the farm floor; make sure the opera- tor has clean hands; check the share of new males; look out for floor and dirty eggs; be careful of improper or acci- dental showers of eggs; look out for the sweating of eggs in storage; be careful of changes of new males; pay attention to aspergillus or mycosis contamination; control and improve disinfection pro- cesses. › › Improper breeder nutrition: feed breeders a diet with balanced nutrient levels. farm floor; make sure the operator has clean hands; be careful of improper or accidental showers of eggs; look out for the sweating of eggs in storage; be care- ful of changes of new males, look out for floor and dirty eggs; pay attention to as- pergillus or mycosis contamination; con- trol and improve disinfection processes.