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The present study was aimed to explore embryonic mortality pattern of fertile eggs of Vanaraja chicken reared on deep litter system. The study was conducted in the year 2016 at Hatchery Unit of West Bengal University of Animal and Fishery Sciences, Mohanpur campus (Nadia District). Birds were divided in 3 age groups as 27 to 40, 41 to 72 and 73 to 92 weeks. Eggs were grouped into three categories; 38 to 41.3, 41.6 to 54.8 and> 55g. Eggs were stored with the small end pointed downward for 1, 2, 3, 4, 5, 6 days and 86, 144, 140, 156, 155, 148 numbers of eggs, respectively, introduced to the setter. There was no significant effect of flock age, egg weight, pre-incubation storage (p75% with both egg shape index range i.e. 64 to 71.96 and 72 to 74.97%, but no significant difference among 64-71.96 and 72-74.97%. There was significant difference in embryonic mortality when shell thickness was 0.22 to 0.31 mm with both shell thickness groups i.e. 0.15-0.21and >0.32 mm, but no significant differences was found in between 0.15-0.21 mm and >0.32 mm shell thickness groups. Results from this study concluded that embryonic mortality of eggs of vanaraja chicken was influenced by shell thickness and shape index of eggs. | Factors associated with embryonic mortality of eggs of Vanaraja breeder chicken reared on deep litter system
