Ruminant Nitrogen Usage (1985) / Chapter Skim
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4 Feed Evaluation
4 Feed Evaluation
Pages 23-27
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From page 23... ...
The difficulty of obtaining UIPIP data with cannulated animals and the variation within feed classes cause the search for accurate predictive assays for individual feeds to continue. A summary of the correlations among UIPIP assays, insolubility assays, and in vivo responses is given in Table 5.
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From page 24... ...
Burroughs (total diet) In viva protein degradation In sate bags In Vitro nitrogen digestion In Vitro ammonia accumulation In Vitro ammonia accumulation Pronase Pepsin Pepsin Duodenal N flow/feed N Pepsin In site bags Autoclaved rumen fluid Burroughs Sodium chloride In vitro ammonia accumulation Autoclaved rumen fluid Burroughs, modified Burroughs Burroughs McDougall's Sodium chloride Sodium hydroxide Water Autoclaved rumen fluid Burroughs, modified Burroughs Burroughs Burroughs 3 3 3 3 11 11 10 11 11 21 is 28 28 28 6 6 6 25 6 6 7 7 7 28 350 7 .79 9 .71-.76 9 .25-.49 9 .49-.S5 9 .34-.44 9 .46-.58 9 .32 9 .17 9 .49 9 .55 .95 4 .91 6 .99 4 .28 .04 .85 .59 .61 .44 .61 .63 .10 .56 .27 .96 .29 .44 .22 .01-.34 .01-.61 .01-.49 .98 .02-.64 .04-.45 .27 .14 .01 .04 .61 .53 First covariate Second covariate McDougall s Sodium chloride, .15 M Sodium chloride, .15 M Sodium chloride, .15 M Gonzalez et al., 1979 Poos et al., 1980a Poos et al., 1980a Poos et al., 1980a Poos et al., 1980a Poos et al., 1980b Poos et al., 1980b Poos et al., 1980b Poos et al., 1980b Poos et al., 1980b Waldo and Tyrrell, 1980 Waldo and Tyrrell, 1980 Waldo, 1977b Wohlt et al., 1976 Sniffen, 1974 Sniffen, 1974 Sniffen, 1974 Stern et al., 1980 Siddons and Beever, 1977 Siddons and Beever, 1977 Hagemeister et al., 1976 Siddons and Beever, 1977 Siddons and Beever, 1977 Siddons et al., 1976 Beever et al., 1976 Crawford et al., 1978 Crawford et al., 1978 Crawford et al., 1978 Crooker et al., 1978 Crooker et al., 1978 Crooker et al., 1978 Henderickx and Martin, 1963 Crooker et al., 1978 Crooker et al., 1978 Little et al., 1963 Little et al., 1963 Crooker et al., 1978 Crooker et al., 1978 Animal Procedures Crawford et al., 1978 Waldo and Goering, 1979 n r2 Reference _ .
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From page 25... ...
A basal or negative control diet contains supplemental nitrogen as 100 percent urea while the reference or positive control diet contains supplemental nitrogen as 40 percent from soybean meal and 60 percent from urea. Test proteins are substituted for soybean meal, and a protein efficiency is calculated as the incremental gain from the protein supplement divided by the incremental protein intake from that protein supplement.
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From page 26... ...
Secondly, time lags are an occasional component of descriptive biology using differential equations and are consistent with the assumption of fractional rate constants. But termination times are inconsistent with the concept of fractional rate conslants.
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From page 27... ...
Fine soybean meal increased ruminal bypass of nitrogen compared to coarse soybean meal (Netemeyer et al., 1980) but did not alter rumen ammonia, blood urea, total tract digestibility, and milk production.
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