Document Detail

MedLine Citation:
PMID:  21525177     Owner:  NLM     Status:  Publisher    
Meals have long been considered relevant units of feeding behavior. Large data sets of feeding behavior of cattle, pigs, chickens, ducks, turkeys, dolphins and rats were analyzed with the aims of (i) describing the temporal structure of feeding behavior and (ii) developing appropriate methods for estimating meal criteria. Longer (between-meal) intervals were never distributed as the negative exponential assumed by traditional methods such as log-survivorship analysis, but as a skewed Gaussian, which can be (almost) normalized by log-transformation of interval lengths. Log-transformation can also normalize frequency distribution(s) of within-meal intervals. Meal-criteria, i.e. the longest interval considered to occur within meals, can be estimated after fitting models consisting of Gaussians or a Weibull and one or more Gaussians to the distribution of log-transformed interval lengths. Non-uniform data sets may require disaggregation before this can be achieved. Observations from all species were in conflict with assumptions of random behavior that underlie traditional methods for criteria estimation. Instead, the observed structure of feeding behavior is consistent with (i) a decrease in satiety associated with an increase in the probability of animals starting a meal with time since the last meal and (ii) an increase in satiation associated with an increase in the probability of animals ending a meal with amount of food already consumed. The novel methodology proposed here will avoid biased conclusions from analyses of feeding behavior associated with previous methods and, as demonstrated, can be applied across a range of species to address questions relevant to the control of food intake.
Bert Jan Tolkamp; David J Allcroft; Juan Pablo Barrio; Tobias A G Bley; Jennifer A Howie; Troels B Jacobsen; Colin A Morgan; Diederik P N Schweitzer; Samantha Wilkinson; Martin P Yeates; Ilias Kyriazakis
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-27
Journal Detail:
Title:  American journal of physiology. Regulatory, integrative and comparative physiology     Volume:  -     ISSN:  1522-1490     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100901230     Medline TA:  Am J Physiol Regul Integr Comp Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
1Scottish Agricultural College.
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