Abstract
Present study was planned to determine variations in external and internal quality egg parameters of different avian species including ostrich Struthio camelus, ducks Anas platyrhynchos, chicken Gallus gallus, turkeys Meleagris gallopavo and grey francolin Francolinus pondicerinus. All the birds were kept under similar rearing conditions. A total of 150 eggs were collected for each species to record external features of these eggs. Statistically significant (p<0.05) variations were recorded in egg weight, egg length and egg width between ostrich, ducks, chicken, turkey and quail eggs. Significantly (p<0.05) higher egg weight, egg length and egg width was observed for ostrich eggs while the same was lowest for grey francolin eggs. Similarly, significantly (p<0.05) greater shape index and egg volume values were observed for ostrich eggs while lowest shape index values were recorded for turkey eggs and egg volume was lowest for grey francolin. Significantly, higher (p<0.05) values of egg density were noted for eggs of the quail and the same were lowest for ostrich eggs. Non-significant variations in egg density values were observed between eggs of the ducks, chicken, turkey and grey francolin. It has been concluded that the positive correlations between the internal and external egg quality traits indicated that the traits can be improved through selection.
Highlights
Egg is considered as natural reproductive site, it provides balanced diet to developing embryo and serves as food source for chick’s first days of life (Abanikannda et al, 2007)
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Summary
Egg is considered as natural reproductive site, it provides balanced diet to developing embryo and serves as food source for chick’s first days of life (Abanikannda et al, 2007). Egg quality indicates those characters of egg that contributes it’s acceptability towards consumer (Altinel et al, 1996). Internal factors such as haugh unit, yolk index, yolk height, albumin height, albumin width are 2.1. External and internal egg quality parameters considered by industry as demand for liquid egg, frozen egg, powder egg increasing day by day (Silversides et al, 2006). In poultry industry internal and external traits of eggs are influencing growth quality, future generation and breeding performance (Di Rosa et al, 2020)
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