抄録< jats: title> Summary</jats: title>< jats: p> 1. The maximum possible efficiency at which
living systems are able to convert input nutrients to their own biomass is between 70 and …

Ad libitum feeding, customarily used for nutritional and toxicological studies, usually leads to
obesity and reduced longevity in long-term studies. This experiment was designed to …

1. Body composition was determined in 9‐week‐old chickens sampled from four lines
selected either for increased body‐weight gain (line W), for increased food consumption …

Mice were selected for one of three criteria: appetite (A), measured as 4-to 6-week food
intake, adjusted by phenotypic regression to minimize change in 4-week body weight, fat …

Correlated responses are examined from a biological rather than from a biometrical point of
view. Selection for increased body weight in laboratory animals usually, though not always …

The metabolizable energy intake (MEI) required for maintenance and the efficiency of
utilization of metabolizable energy available for gain (MEA) were determined for a line of …

The literature since 1965 on experimental investigations involving the laboratory mouse as a
mammalian model for studying the genetics of growth is reviewed. Particular emphasis is …

The effectiveness of selection for 3–9-week gain was examined in a population of rats with a
history of past selection for high 3–9-week gain. Lines were selected for high (U line) and …

Correlated responses to selection for increased growth rate were compared in two mouse
populations (M16 and H 6) of distinct genetic origin. Traits studied were body composition …

Although deposition of agram of fat has the same energy cost as deposition of agram of
protein (Webster, 1980), fat tissue is 20% water as compared with 80% water for lean. Thus …