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Residual feed intake (RFI), also known as net feed efficiency, is growing in popularity as a measure of feed efficiency.
Residual feed intake, a measure of feed efficiency of growing cattle, is a complex trait controlled by different metabolic processes [ 9].
The most commonly used measure of feed efficiency has traditionally been feed conversion ratio, which is the ratio of feed consumed to body weight gain.
Residual feed intake (RFI) is an alternate measure of feed efficiency, defined as the difference between an animal's actual and expected feed intake based on its body weight and growth rate during the feeding period [ 1, 3].
A direct measure of feed efficiency can be omitted from an index, without decreasing the accuracy, if it is developed with appropriate weights on the component traits (feed intake, body weight, and growth) [ 13].
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Latino children are at higher risk of obesity than the general population, yet valid measure of feeding practices, one of which is the Infant Feeding Styles Questionnaire (IFSQ), have not been formally validated in Spanish.
As a composite measure of feeding effort per male, we calculated the median of these rates for each male.
In C. elegans, feeding is dependent on the pumping motion of the pharynx, which results in the ingestion of food, and whose rate is an easily quantified measure of feeding.
Whereas, the PhenoTyper (Noldus IT, The Netherlands) allows the tracking of behaviours (patrolling and feeding) based on user-defined zones, as an indirect measure of feeding behaviour/food intake.
The first set of assays showed a negative correlation between the duration prior to feeding and the behavioral change as a measure of feeding propensity; the shorter the time between the light pulses and blood provision, the larger the decrease in feeding propensity.
All direct measures of feed efficiency require accurate measurement of feed intake and energy uses such as BW, growth and body composition in young cattle (Arthur et al., 2001a and 2001b; Basarab et al., 2003, 2007 and 2011), and BW, fat mobilization and milk fat, protein and yield in lactating dairy cattle (Rius et al., 2012).
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