Homeoresis theory
The requirement is calculated by a factor approach, but how nutrients are used, ie nutrient allocation, should be prioritized according to the stage of production.Therefore, the diet evaluation and design program must respond to the predicted demand for each stage, which varies according to the ranking.
The homeoresis theory clarified the allocation mechanism (Bauman and Currie, 1980).
As an example, the figure below shows that the priority of nutrient distribution is lactation, growth, and pregnancy.
Until this theory was proposed, there was no clear answer to the extremely simple question, "Why does milk production increase from the perinatal period to the peak of lactation?".
It has been demonstrated that administration of growth hormone in late lactation "reproduces the perinatal period", confirming the correctness of the theory.
Papers on homeoresis theory have consistently ranked high in the number of citations in all past papers published in the Journal of Dairy Science, and are one of the important mechanisms not only in diet design but also in dairy cow science in general. increase.
In order for the feed evaluation and design model to predict actual measurements, the following two points are considered important (Daniel et al., 2020).
Of these, the theory of homeostasis clarifies the distribution of nutrients in the body, and research related to this theory continues today, mainly in the United States.
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Accurate prediction of nutrients available for absorption
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Accurate prediction of body nutrient partitioning and conversion efficiency of absorbed nutrients into milk
I have repeatedly interviewed Professor Emeritus Dale Bauman of Cornell University, who advocated and continues to develop the theory of homeostasis. to access.Dr. Bauman was also the first person to clarify the mechanism of milk fat reduction by CLA.
Japanese translation of Bauman, 2012