Intra-Flock Genetic Merit under Floor and Cage Managements

Performance and Interactions of Seven Egg Production Stocks in Three Cage Housing Regimes

“…He also concluded that some strains of S. C. White Leghorns apparently adapt themselves better to cage conditions than other strains. Lowry et al (1956) found no evidence of a genotype-management interaction when comparing full sisters housed in floor pens and laying cages. Francis (1957) reported that some strains of Leghorns were better able to adapt themselves to cages than hybrids.…”

An Empirical Test of Part-Record Selection for Egg Production

“…Accordingly, in each of the three generations of the test, families of full-sisters were systematically divided into cage and floor groups. The analysis of the cage-floor experiment (Lowry, Lerner and Taylor, 1956) showed that no interaction between genotype and management was detectable in this material. However, since mean values for some traits did differ between the cage and the floor groups, the data for them will be presented separately here.…”

“…Thus, the same material used in the test was also involved in an unrelated study on genotype-environment interaction (Lowry, Lerner and Taylor, 1956). Further, the year-to-year environmental fluctuations may have masked gains expected over the short period of the experiment.…”

Sources of Variation in the Cornell Controls at Two Locations

“…Munroe (1936) suggested the possibility of genotype-environment interactions in poultry. However, many investigators, including Gutteridge and O'Neil (1942), King et al (1952) Gowe and Wakely (1954), Lowry et al (1956), Abplanalp (1956), Proudfoot et al (1957), McBride (1962), Becker (1961) and Proudfoot (1962), either found no such interactions or found them to be of little importance. Significant interactions were found by Osborn (1952), Skaller and Sheldon (1955), Gowe (1956), Merritt and Gowe (1956), Hill and Nordskog (1956), Huston and Joiner (1957), Johnson and Asmundson (1957), Nordskog and Kempthorne (1958), King and Bray (1959), Dickerson (I960), Abplanalp and Menzi (1961) and Abplanalp el al.…”