questions: query regarding egg production 
 answers: egg of chicken ( farm & local ) & duck egg are almost same in composition in protein content (  albumin ). & their nutritive value are almost same for egg eater ,but the palatability of local egg is higher then farm egg & yolk are more yellowish in colour in local egg due to presence of a pigment  known as  beta - kerotene . the pigment keratine has no such imprtant( as the albumin , which is the main protein present in egg )  nutritive value of egg , but the  palatability  & colour impress the consumer for the yellowish colour of the yolk.