Nutritional Value of Urea Versus Preformed Protein for Ruminants. I. Lactation of Dairy Cows Fed Corn Based Diets Containing Supplemental Nitrogen from Urea and/or Soybean Meal
J.E. Wohlt,J.H. Clark +1 more
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In this paper, 15 Holstein cows at various stages of lactation, fed corn-based diets that contained 9 to 14.5% crude protein were used in total collection digestibility and nitrogen balance trials to investigate the efficiency of nitrogen utilization from urea and soybean meal.About:
This article is published in Journal of Dairy Science.The article was published on 1978-07-01 and is currently open access. It has received 92 citations till now. The article focuses on the topics: Soybean meal & Nitrogen balance.read more
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Protein and Energy as an Integrated System. Relationship of Ruminal Protein and Carbohydrate Availability to Microbial Synthesis and Milk Production
J.E. Nocek,James B. Russell +1 more
TL;DR: In early lactation, dietary CP and energy can profoundly affect milk yield, but current methods of assessing these nutrients are often inadequate to predict animal performance.
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Protein-Energy Interrelationships in Dairy Cows
TL;DR: In dairy cows two distinct and important aspects of the interrelationship between protein and energy-yielding nutrients can be identified; that changing "protein" supply to tissues can alter the pattern and efficiency of absorbed nutrient use and that at high levels of feeding rumen microbial demand for nitrogen per unit fermentable organic matter is high.
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Effects of urea and starch on rumen fermentation, nutrient passage to the duodenum, and performance of cows.
TL;DR: Four midlactation, multiparous Holstein cows fitted with ruminal and duodenal cannulas were used to determine the effects of supplementing urea or starch or both to diets containing fish meal on passage of nutrients to the small intestine and performance of lactating cows.
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Effects of Different Protein Supplements on Milk Production and Nutrient Utilization in Lactating Dairy Cows
Andre F. Brito,Glen A. Broderick +1 more
TL;DR: Overall, production and N utilization were compromised when the diets of high-yielding dairy cows were supplemented with urea rather than true protein and the value of the true proteins.
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Some Aspects of Feeding High Producing Dairy Cows
J.H. Clark,C.L. Davis +1 more
TL;DR: The increased use of cereal grains in rations of dairy cows along with the use of roughages that have been chopped, pelleted, or ground make considering buffers in feeding the dairy cow both beneficial and profitable.
References
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Principles and Procedures of Statistics.
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Extension of multiple range tests to group means with unequal numbers of replications
Abstract: In many fields of research, one is faced with the task of comparing the effects of treatments which have been replicated unequally. This happens for a number of reasons. In an experiment on animals, some may get sick and have to be removed from the experiment. In some experiments, the amount of material available for certain treatments may not be as much as for other treatments. If the experimenter has specified orthogonal contrasts that he is interested in before he runs the experiment, one can test the various treatment effects by an F-test after the treatment sum of squares has been partitioned into individual degrees of freedom for each orthogonal contrast. If the experimenter has not specified orthogonal contrasts, one is faced with the problem of deciding which treatments are significantly different. Several writers, including Duncan, Keuls, Newman, and Tukey, have developed multiple range tests to show differences among treatments that have been replicated the same number of times and when nothing was specified concerning the treatments. Duncan [1] compares the above methods and gives citations. This extension to unequal numbers of replications will be exemplified with reference to Duncan's "New Multiple Range Test," but is applicable to any of the above writers' tests; all one has to do is use their tabled ranges. In Duncan's test for an equal number of replications, the difference between any two ranked means is significant if the difference exceeds a shortest significant range. This shortest significant range is designated by R, and is obtained by multiplying the standard error of a mean, s,, by a given value, zn2, obtained from a table of significant studentized ranges which Duncan has tabled for both the 5% and 1% test. In Duncan's terminology, n2 is the degrees of freedom of the error mean square and p = 1, 2, * *, t is the number of means concerned. Consider an experiment with five treatments, A, B. C, D, and E, each replicated n times. Suppose on ranking the means from low to high one obtains
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Use of Detergents in the Analysis of Fibrous Feeds. II. A Rapid Method for the Determination of Fiber and Lignin
TL;DR: The acid-detergent fiber method (ADF) as mentioned in this paper is a fiber method based on cetyl trimethylammonium bromide to dissolve proteins in acid solution.
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Effect of ammonia concentration on rumen microbial protein production in vitro
L. D Satter,L. L Slyter +1 more
TL;DR: The results suggest that addition of non-protein N supplements to ruminant rations are warranted only if the prevailing concentration of ruminal ammonia is less than 50 mg NH3-N/l ruminal fluid.