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- W351609802 abstract "A mechanistic model of intake and chewing activities was developed using data from confined sheep in order to integrate the relationships between feeding behavior and digestive processes. The model consists of two interconnected submodels. The ruminal digestion submodel describes flows of nutrients and is based on differential equations to simulate the dynamic evolution of particulate matter and volatile fatty acids (VFA) in the reticulorumen. The diet is characterized by cell wall content and its potential digestibility, by the proportion of large particles (LP) retained on a 1-mm mesh sieve, and by an index of palatability. Particle comminution occurs during eating and ruminating. Intake is determined from attributes of the diet, animal live weight, and satiety status. Particulate outflow is calculated from a description of the activity of the reticulo-omasal orifice. Microbial digestion rates vary with lag phase, chemical fraction, size of particles, and ruminal pH. The VFA are aggregated into one compartment. The feeding decision submodel distinguishes among eating, ruminating, and resting. The choice among these activities is decided at each minute of simulation according to the relative values of functions of intake motivation (FMI) and of satiety (FSAT). The FMI function is based on diet palatability, energy balance, and the diurnal cycle. The FSAT function is determined by rumen load signals and energy balance. When the animal does not eat, the decision between ruminating and resting is related to the proportion of long particles in the rumen. Sensitivity analysis and validations indicate that the overall behavior of the model is adequate." @default.
- W351609802 created "2016-06-24" @default.
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- W351609802 date "1996-01-01" @default.
- W351609802 modified "2023-09-24" @default.
- W351609802 title "Development of a mechanistic model of intake and chewing activities of sheep." @default.
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- W351609802 doi "https://doi.org/10.2527/1996.74112785x" @default.
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