By Subcommittee on Dairy Cattle Nutrition, Committee on Animal Nutrition, National Research Council
This universal reference has been up-to-date and remodeled to mirror the altering face of the dairy undefined. New good points enable clients to pinpoint nutrient requisites extra thoroughly for person animals. The committee additionally presents counsel on how nutrient research of feed materials, insights into nutrient usage via the animal, and formula of diets to lessen environmental affects might be utilized to efficient administration decisions.
The ebook incorporates a simple desktop software on a compact disk, followed via vast context-sensitive "Help" ideas, to simulate the dynamic kingdom of animals.
The committee addresses very important matters designated to dairy science-the dry or transition cow, udder edema, milk fever, low-fat milk, calf dehydration, and extra. The additionally quantity covers dry topic consumption, together with find out how to are expecting feed consumption. It addresses the administration of lactating dairy cows, usage of fats in calf and lactation diets, and calf and heifer substitute meals. moreover, the numerous worthy tables comprise up to date nutrient composition for primary feedstuffs.
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Extra info for Nutrient Requirements of Dairy Cattle
1985) and calf equation from the Nutrient Requirements of Beef Cattle (National Research Council, 1996) were selected for initial evaluation using data from New Hampshire and Minnesota where dietary composition, heifer growth, and DMI were measured over several months. The equation of Quigley et al. (1986) and the Nutrient Requirements of Beef Cattle equation (National Research Council, 1996) include dietary energy content and body weight. An equation based only on animal parameters was preferred to one including dietary components, however, the only published heifer DMI equation without dietary components found was from Stallings et al.
Polan. 1974. Social rank, feeding behavior, and free stall utilization by dairy cattle. J. Dairy Sci. 57:1214– 1220. Friend, T. , C. E. Polan, and M. L. McGilliard. 1977. Free stall and feed bunk requirements relative to behavior, production and individual feed intake in dairy cows. J. Dairy Sci. 60:108– 116. , M. A. DeLorenzo, D. K. Beede, C. R. Staples, and J. B. Holter. 1996. Evaluation of equations based on animal factors to predict intake of lactating Holstein cows. J. Dairy Sci. 79:1562– 1571.
In the experiments used to determine fat digestibility, cows were fed at approximately 3X maintenance. 92 to adjust values to TDN1X. 25 to convert to TDN1X (Equations 2-7a and 2-7b). 25 (2-7b) where FAdigest סdigestibility coefficients for fatty acids (Table 2-3). 00 Estimating DE of Feeds FAT SUPPLEMENTS The TDN1X values of different fat supplements were calculated from measured fatty acid digestibility. 13 — 15 9 9 10 — Crampton et al. 409 Mcal/kg. , 1979), the gross energy value of TDN is not constant among feeds.
Nutrient Requirements of Dairy Cattle by Subcommittee on Dairy Cattle Nutrition, Committee on Animal Nutrition, National Research Council