Egg Production and Selection

Selection for egg production and correlated responses in the fowl.

HE effectiveness of selection for genetic improvement of egg production in the fowl remains a controversial issue. Mass selection on annual egg records has long been regarded as ineffective as demonstrated by the early work of PEARL (1915), while selection based on family records and progeny testing has seemed to be the key to success as demonstrated by the long-time selection experiments of DE...

Egg production functions

Genetics of growth and reproduction in the turkey. 15. Effect of long-term selection for increased egg production on the genetics of growth and egg production traits.

A line (E) of turkeys selected long-term (37 generations) for increased egg production was reciprocally crossed with its randombred control population (RBC1) that served as the base population of the E line to study the influence of long-term selection on the development of nonadditive genetic variation for egg production and body weight traits. Heterosis was significant for BW at 8, 16, and 20...

Egg Production Traits and Egg Quality Characteristics in Black and Brown Plumage Color Lines of Japanese Quail

The present study was conducted to determine egg production traits and egg quality characteristics in black and brown lines of Japanese quail. A total of 500 quails comprising 400 females and 100 males obtained from two breeding centers were raised according to the standard procedure for Japanese quail. They were grouped in according to their plumage colours. Age at first egg-laying has been re...

Net genetic and temporary epistatic or maternal environmental responses to selection for egg production in chickens.

The difference between progeny from selected and unselected parents (T) was experimentally partitioned into net genetic change (G(A)), temporary favorable epistatic combinations (G(EP)) and egg-transmitted maternal environment (M) in two strains of Leghorns selected over 14 years for early pure-strain egg production. Differences among progeny from selected sires and dams, selected sires only, s...