The Use of Partial Records in Poultry Selection

Abstract

Selection work with the Rhode Island Red breed, involving the extensive collection of records, was first started at Wye College in 1948. Since that time the methods of selection employed have changed substantially in the light of the experience gained and the scheme, as it is operated at present, is shown diagrammatically in Fig. 1.Sixty full-sister groups are recorded from first egg to the end of November. At least three full brothers of each of these sister groups.

Heritability and Selection Efficiency of Several Measures of Egg Production

“…Both the phenotypic and the genotypic correlations between number of eggs to January 1 and the three measures of annual production (Table 2) are lower than found by either Lerner and Cruden (1948) or Maddison (1954). The primary common source of variance of these two measures is gross rate of lay.…”

Curvilinear Trends in Direct and Some Correlated Responses to Nineteen Generations of Selection for Part Record Rate of Egg Production in a Randombred Line of Chickens

“…These include Lemer and Cruden (1948), Maddison (1954), Morris (1956), Oliver et al (1957), Erasmus (1962), and Van VIeck and Doolittle (1964). Saadeh et al (1968) obtained significant direct and correlated responses to selection on percent production to 260 days of age.…”