Egg Production Traits as Correlated Responses to the Selection for Immune Responses in Chickens.
نویسندگان
چکیده
منابع مشابه
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...
متن کاملNet 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...
متن کاملCorrelated responses in reproductive and carcass traits to selection for 70-day weight in Landrace swine.
Correlated responses in reproductive and carcass traits were studied in 181 litters and 218 pigs from a line of Landrace pigs selected six generations for increased weight at 70 d of age and a contemporaneous, randomly selected control line. The reproductive and maternal traits studied included litter sizes born, born alive, and alive at 21 d and litter weight at birth and at 21 d. Carcass trai...
متن کاملCorrelated responses in reproductive and carcass traits to selection for 200-day weight in Duroc swine.
Correlated responses in reproductive and carcass traits from a line of Duroc pigs selected for increased 200-d weight along with a randomly selected control line were studied in 189 litters (116 select, 73 control) and 191 pigs (106 select, 85 control), respectively. Reproductive and maternal traits studied included litter sizes born, born alive, and alive at 21 d and litter weight at birth and...
متن کاملCorrelated responses in reproductive and carcass traits to selection for 200-day weight in Landrace pigs.
Correlated responses in reproductive and carcass traits from a line of Landrace pigs selected for increased 200-d weight along with a randomly selected control line were studied in 195 litters (109 select, 86 control) and 285 pigs (132 select, 153 control). Reproductive and maternal traits studied included litter sizes born, born alive, and alive at 21 d and litter weights at birth and at 21 d....
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ژورنال
عنوان ژورنال: Japanese poultry science
سال: 1992
ISSN: 0029-0254
DOI: 10.2141/jpsa.29.296