Selection for 8-Week Body Weight in Normal and Dwarf Chickens Under Different Water/Feed Environments

Long-term Divergent Selection for 8-week Body Weight in Chickens – a Review of Experiments

In order to study the effects of long-term selection on genetic parameters, the effect of selection on selected and correlated traits and to develop lines for various physiological, biochemical and molecular genetic studies a comprehensive selection study for body weight in chickens has been conducted at the Biotechnical Faculty of University in Ljubljana. Long-term divergent selection in chick...

Divergent selection for four-week body weight in Japanese quail (Coturnix coturnix japonica): response to selection and realized heritability

The Japanese quail has been utilized as a research species in establishing the genetic relationships that may also be present in other species. Divergent phenotypic selection for 4-wk BW was conducted for three generations in high (HW) and low (LW) lines. Within each line, 50 females and 25 males were selected among 600 birds, based on 4-wk BW. Mean BW at 4 wk of age in the base generation was ...

Selection for Body Weight in Japanese Quail under Different Nutritional Environments

Long-term divergent selection for eight-week body weight in white Plymouth rock chickens.

This paper provides an overview of results from a long-term (38 generations) selection experiment. Lines were developed from individual phenotypic selection for high or low body weight at 8 wk of age. Included are data for the selected lines, sublines in which selection was relaxed, crosses of the selected lines, and sublines in which the sex-linked dw gene was introduced. Periodically (and in ...

Genetic diversity and population structure in lines of chickens divergently selected for high and low 8-week body weight.

A long-term selection experiment for high or low 8-wk BW in White Plymouth Rock chickens was conducted to study effects of selection on BW and correlated characters. Two lines [high (HWS), low (LWS) weight] were established and have undergone 48 generations of selection. The lines were managed to curtail inbreeding and to maintain similar population structures; such is necessary for equitable c...