By W J Miller
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Extra info for Dairy cattle feeding and nutrition
J. Dairy Sci. 33, 911-917. Blaxter, K. L. (1967). " Thomas, Springfield, Illinois. Broster, W. , V. J. Broster, and T. Smith (1969). J. Agric. Sci. 72, 229-245. Cannon, W. B. (1929). Physiol. Rev. 9 , 399. Conrad, H. , A. D. Pratt, and J. W. Hibbs (1964). J. Dairy Sci. 4 7 , 54-62. Flatt, W. P. (1966). J. Dairy Sci. 4 9 , 230-237. Flatt, W. , P. W. Moe, and L. A. Moore (1969). Eur. Assoc. Anim. , Publ. 12, 123-136. Miller, W. J. (1975). J. Dairy Sci. 58, 1549-1560. Moe, P. W. (1976). Feed Manage.
In these examples, 1000-lb cows are capable of producing 37 and 62 lb of milk daily. At lower milk production (capacity), physiological factors limit intake at a lower digestibility. ) capacity restricts intake, and the dairy animal does not consume as much usable energy as needed, performance is reduced. In contrast, with a highly digestible ration, chemical and/or physiological factors limit the amount of dry matter eaten. , 1964) (see Fig. 5). REFERENCES Agricultural Research Council (ARC) (1965).
The percentage increases with more fibrous rations. Net energy is that which remains after the energy in feces, gasses, urine, and the heat created during digestion and assimilation of nutrients are subtracted from the total or gross feed energy (GE) (Fig. 1). The formula is Accordingly, NE is that which can be used by the animal for maintenance, growth, reproduction, milk production, work, and/or fattening (Fig. 1). Net energy is the most accurate way to express the usable energy content of feeds and the energy requirements of dairy cattle.