The effects of genotype on internal and external egg quality traits, egg proximate composition and lipid profile characteristics of three strains of layer turkeys.
This study was conducted to determine the influence of egg genotype on internal and external egg quality, proximate composition and lipid profile. Ninety (90) fresh eggs of the three genotype in exotic, crossbred and local strains of layers turkey were used. The genotype has significant effect (P<0.05) on egg proximate composition and other egg traits. Egg quality trait in term of crude protein highly favored exotic compared to other. There's significant effect (P<0.05) on internal and external egg quality trait. The result also showed significant effect (P<0.05) on egg weight and egg production traits when compared between genotypes. The mean weights of exotic turkey eggs (76.10 g) was significantly (P<0.05) much heavier than the crossbred and local turkey eggs (65.85 g). The egg length and egg width followed the same pattern. The proportion of shell weight to the egg weight was higher in exotic turkey (7.40 g) than the local turkey (6.15 g). Similarly, the exotic turkey eggs had the highest values of internal and external egg traits. The effect of genotype on egg biochemical indices were significantly (P<0.05) different from each other. The highest value of the total cholesterol (TC) and Try glycerol (TG) were found among the local turkey eggs. The egg lipids for High density lipoproteins (45.80±4.28%) and low density lipoproteins (51.60±6.58%) were also significantly (P<0.05) different and higher in the local turkey eggs. The mean values of potassium, glucose, total protein, albumin, globulin, calcium and phosphorus of the genotype were also significantly (P<0.05) influenced. The egg minerals in relation to genotypes were also significantly (P<0.05) influenced, the values are suggestive of the existence of genetic variation. The present study therefore indicates that genotype, significantly affect egg weight and egg quality traits. The implication is that the egg quality traits are influenced by both genetic and non genetic factors.