Direct and correlated responses to selection for weaning weight, post-weaning weight gain and six-week weight in mice

Baker, R. L.; Cox, E. H.; Carter, A. H.

doi:10.1007/bf00317015

Cited by 6 publications

(3 citation statements)

References 31 publications

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“…Realized genetic correlations between 6-week weight and 3-week weight or 3-6 week gain were high and similar to those obtained in comparable experiments (E ISEN , 1978 ;BAKER et al, 1984). However, the value calculated between 3-week and 6-week weight seems to be an overestimate since the correlated response obtained in 3-week weight following selection for 6-week body weight is mostly caused by the maternal effect (E ISEN , 1972).…”

Section: B Direct Responsesupporting

confidence: 76%

Direct and correlated responses to selection for large and small 6-week body weight in mice

Bayón¹,

Fuente²,

Primitivo³

1987

Genetics Selection Evolution

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Section: B Direct Responsesupporting

confidence: 76%

Direct and correlated responses to selection for large and small 6-week body weight in mice

Bayón¹,

Fuente²,

Primitivo³

1987

Genetics Selection Evolution

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“…There are many possible additional maternal effects, e.g. uterine environment, milk quality, etc., which might affect an offspring's neurophysiological development and ultimately its foraging performance (Willham, 1972;Hayes and Eisen, 1979;Atchley, 1984;Baker et al, 1984). In particular, optimal mothers have a greater daily energy intake (Ritchie, 1990), and might have more energy or nutrients to invest in their offspring.…”

Section: Genetic Component Of Foraging Behaviourmentioning

confidence: 99%

Inheritance of optimal foraging behaviour in Columbian ground squirrels

Ritchie

1991

Evol Ecol

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in SummaryI examined the potential inheritance of the ability of Columbian ground squirrels (Spermophilus columbianus) to select an optimal diet. I calculated the diet that would maximize daily energy intake for each of 21 adult females and their litters, using a linear programming optimization model for each individual. The absolute value of the difference between an individual's predicted optimal diet and observed diet (deviation from an optimal diet) was used as a measure of an individual's foraging ability. The foraging ability of individuals was consistent over time and in different foraging environments, so I considered foraging ability to be a potentially heritable trait.Inheritance was determined from correlations of mother and offspring foraging ability. I experimentally removed some mothers just as they weaned their offspring so that offspring could not be influenced by their mother while learning to forage, while leaving the other mothers to raise their litters normally. In both cases, offspring strongly resembled their mother in foraging ability. However, offspring with mothers absent exhibited significantly larger deviations from their optimal diet. Offspring with mothers absent appeared to imitate their mother's diet during lactation, and this tendency partially explained their greater deviation. Consequently, offspring appear to inherit the ability to forage optimally from their mother, perhaps through observational learning or imitation. There may also be a genetic basis to foraging ability, but uncontrolled maternal effects in the experiment prevent a proper test for it.

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“…Therefore, optimal and deviating foragers differ in their calculated energy intake primarily because they differ in the ability to select their optimal diet. Individuals, however, sometimes show considerable variation in assimilation and conversion efficiency of food (Hayes and Eisen 1979;Baker et al 1984;Garton 1984). Therefore, deviators could potentially compensate for their reduced energy intake through greater digestibility (assimilation efficiency) or conversion efficiency.…”

Section: Energy Intake and Fitnessmentioning

confidence: 99%

Optimal foraging and fitness in Columbian ground squirrels

Ritchie

1990

Oecologia

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Optimal diets were determined for each of 109 individual Columbian ground squirrels (Spermophitus coiumbianus) at two sites in northwestern Montana. Body mass, daily activity time, and vegetation consumption rates for individuals were measured in the field, along with the average water content of vegetation at each ground squirrel colony. I also measured stomach and caecal capacity and turnover rate of plant food through the digestive tract for individuals in the laboratory to construct regressions of digestive capacity as a function of individual body mass. Finally, I obtained literature estimates of average daily energy requirements as a function of body mass and digestible energy content of vegetation. These data were used to construct a linear programming diet model for each individual. The model for each individual was used to predict the proportion of two food types (monocots and dicots) that maximized daily energy intake, given time and digestive constraints on foraging. Individuals were classified as "optimal" or "deviating", depending on whether their observed diet was significantly different from their predicted optimal diet. I determined the consequences of selecting an optimal diet for energy intake and fitness. As expected, daily energy intake calculated for deviators (based on their observed diet proportion) was less than that for optimal foragers. Deviating foragers do not appear to compensate for their lower calculated energy intake through other factors such as body size or physiological efficiency of processing food. Growth rate, yearly survivorship, and litter size increase with calculated energy intake, and optimal foragers have six times the reproductive success of deviators by age three. Optimal foraging behavior, therefore, appears to confer a considerable fitness advantage.

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Direct and correlated responses to selection for weaning weight, post-weaning weight gain and six-week weight in mice

Cited by 6 publications

References 31 publications

Direct and correlated responses to selection for large and small 6-week body weight in mice

Direct and correlated responses to selection for large and small 6-week body weight in mice

Inheritance of optimal foraging behaviour in Columbian ground squirrels

Optimal foraging and fitness in Columbian ground squirrels

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