Abstract
A total number of 300 females and 30 males of two experimental broiler lines, TT (male) and PP (female), with 39 and 36 weeks of age, respectively. Experiment 1 (TT) evaluated the effect of storage time (ST) on hatchability and embryo mortality (EM). Eggs were stored for 2 (ST1), 4 (ST2), 6 (ST3), 8 (ST4), 10 (ST5), 12 (ST6), and 24 (ST7) days and EM was assessed in the periods of 0 to 6 (EM1), 7 a 13 (EM2), 14 to 17 (EM3), 18 to 21 (EM4), and 0 to 21 (TEM) days. Experiment 2 (PP) evaluated the effect of egg weight (EW) on embryo development. Eggs were individually collected and weighed. Embryos were collected and weighed on days 9 (EW9), 11 (EW11), 13 (EW13), EW15, 17 (EW17) days of incubation and at hatching (EW21). ST linearly influenced hatchability and EM, with an estimated 1.17% reduction and a 1.15% increase, respectively for each 1.0 day of storage. Hatchability was reduced in 21% betweeb ST2 and ST7, resulting from a 462% increase in EM. The correlation between egg weight and embryo weight (EW) was significant after EW3 (0.25), reaching 0.72 for EW21, which corresponded to 70.92% of egg weight. The estimated increase in embryo weight for each 1.0g increase in egg weight was 0.71g for EW21.
Highlights
Egg hatchability and chick quality have been used as hatchery performance indicators
The results show a significant effect of storage time on hatchability and embryo mortality
The analysis of regression shows a linear effect of storage time on hatchability (Figure 1), with an estimated reduction of 1.17% per 1.0 day of egg storage
Summary
Egg hatchability and chick quality have been used as hatchery performance indicators. Hatchery results are primarily influenced by the broiler breeder farm, which must supply good quality eggs. The hatchery must account for factors affecting performance indicators such as egg management, storage time and conditions, incubation conditions, etc. Physical egg quality is influenced by bird genotype, general management, health, climate conditions, and breeder age. These factors can interact and affect optimal incubation conditions. Egg water loss and gas exchange are affected by egg size and shape, as well as eggshell porosity, influencing incubation temperature and humidity, during the last week of incubation
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