Lohmann Hatchery Guide

10 LOHMANN TIERZUCHT › MANAGEMENT GUIDE 10 HANDLING HATCHING EGGS upside-down, with the pointed end UP. However, please take care not to move or transport eggs in this position, because the right position of air cells can be lost, which could increase the percentage of malpositioned chicks. Beyond 8 to 10 days of storage, even at op- timal storage conditions, it is normal that hatchability will drop by around 0.5 % eve- ry day. This percentage increases to 1–1.5 % every day after day 11, and the chicks’ quality decreases proportionately. It is important to consider the storage day in terms of the weight loss of eggs. During the storage time, eggs lose weight, which is especially relevant in very long storage times. If we know the weight of eggs at day 3–4 from the day they were laid, we can set both Single-Stage or Multi-Stage setters to preserve the right humidity, in order to have the perfect fix point. Dipping machine Egg weight loss in optimal storage condition 5 days 7 days 9 days 11 days 13 days 15 days 17 days 19 days Brown breeds 0.07 % 0.34 % 0.68 % 1.06 % 1.19 % 1.56 % 1.64 % 1.77 % White breeds 0.09 % 0.53 % 0.71 % 1.10 % 1.24 % 1.61 % 1.73 % 1.84 % Loss of weight module › Incubation data › Transfer data › Hatch data Recommended loss of weight by age Young Flock Age 25 to 32 weeks Min 10.5 % Right 11 % Max 11.5 % Medium Flock Age 33 to 49 weeks Min 11 % Right 11.5 % Max 12.5 % Old Flock Age 50 to 63 weeks Min 11 % Right 12 % Max 13 % Remember: › › The right weight loss condition is calculated from day 3 of storage, as it is recommendable to carry out a weight test at this point. › › The clear eggs have a weight loss relative toeggshell quality; from 6 % t – 8 % max