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The relationship between meal composition and long-term diet choice.
M P Yeates1, B J Tolkamp, I Kyriazakis
1Animal Nutrition and Health Department, Scottish Agricultural College, Edinburgh, EH9 3JG Scotland. m.yeates@ed.sac.ac.uk
Journal of Animal Science
|January 25, 2003
Summary
Cows do not regulate their diet composition within a single meal. Nutrient intake regulation in animals appears to occur over a longer timeframe than individual feeding bouts.
Area of Science:
- Animal nutrition and behavior science
- Nutrient regulation and intake studies
- Feed selection behavior analysis
Background:
- Animals can select consistent diets from complementary feeds over time.
- Understanding short-term feeding behavior is key to nutrient intake regulation.
- Previous research suggests diet regulation might occur within meals.
Purpose of the Study:
- To investigate if cows regulate diet composition within a meal.
- To analyze short-term feeding behavior in relation to nutrient intake.
- To determine the timeframe of nutrient regulation in cows.
Main Methods:
- Cows were offered a choice of high- and low-protein feeds.
- Computerized feeders collected short-term feeding behavior data.
- Meal patterns were analyzed using a mixed-distribution model and random bout comparisons.
Main Results:
- Diet selection was more related to the ratio of visits than intake per visit.
- No evidence was found that cows regulated diet composition within a meal.
- Cows did not adjust intake per visit based on feed type or meal composition.
Conclusions:
- Cows do not attempt to achieve a consistent protein-to-energy ratio within meals.
- Nutrient intake regulation in cows likely occurs over a longer period than a single meal.
- Findings suggest a meal-based timeframe is insufficient for nutrient regulation in multiple animal species.