Response of Egg Number to Selection in Rhode Island Chickens Selected for Part Period Egg Production
نویسندگان
چکیده
منابع مشابه
Assessment of Storage and Temperature on Egg Physical Qualities for Peak Production in Hyline Chickens
The aim of the study was to evaluate the effect of storage and temperature on egg physical quality in Hyline chickens line. A total of 150 eggs from College of Natural Resources farm were sampled for the present experiment. About 70 eggs each were stored in home refrigerator (temperature, 7.46±0.23 ˚C; relative humidity, 24.80±0.05%) and room temperature (temperature, 22.98±1.12 ˚C; relative hu...
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 کاملResponse to selection for body weight and egg weight in chickens.
W E L L conducted selection experiments are useful in testing the validity of modern selection theory. Observed genetic changes from selection frequently show poor agreement with expectation. The relationship of selection to the genetic variance composition of a population, to correlated responses, to plateaued populations and to selection limits are problems not yet well understood. This study...
متن کاملA model for individual egg production in chickens.
Our primary objective was to improve on an existing model for the individual weekly egg production curve by modeling the curve as a sum of logistic functions: one for the increasing phase of production and a sum for the decreasing phases. To illustrate the model, we used four data sets from two pairs of individuals. For these data, the model consisted of an increasing phase and a single decreas...
متن کاملEffect of egg weight on hatchability and hatchling weight in Fayoumi, Desi and crossbred (Rhode Island Red X Fayoumi) chickens
Aim: An experiment was conducted to determine the effect of egg weight on hatchability, embryonic deaths and hatchling weight of three rural breeds (Fayoumi, Desi and crossbred (Rhode Island Red X Fayoumi) chickens. Materials and Methods: Three different egg weight groups classified into small: (<41g), medium (41-45g) and large (> 45g) were used in the experiment. A complete randomized design w...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: International Journal of Poultry Science
سال: 2006
ISSN: 1682-8356
DOI: 10.3923/ijps.2007.18.22