D. R. Brink and R. T. Steele as Affected by Source of Calcium and Level of Corn. Site and Extent of Starch and Neutral Detergent Fiber Digestion. 1985 ...
Site and Extent of Starch and Neutral Detergent Fiber Digestion as Affected by Source of Calcium and Level of Corn D. R. Brink and R. T. Steele J ANIM SCI 1985, 60:1330-1337.
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SITE AND EXTENT OF STARCH A N D NEUTRAL DETERGENT FIBER DIGESTION AS AFFECTED BY SOURCE OF CALCIUM AND LEVEL OF CORN 1 D. R. Brink and R. T. Steele 2 University of Nebraska, Lincoln 68583-0908
Summary
Five steers (385 kg) fitted with permanent abomasal cannulae were used to compare Ca source (limestone or dicalcium phosphate) and corn level on site and extent of digestion. Diets contained 50, 70 or 90% corn, with corn silage and supplement to provide .70% Ca from either limestone or dicalcium phosphate. Limestone did not affect ruminal digestion, but postruminal starch and neutral detergent fiber (NDF) digestion were higher (PF
Organic matter intake, g/d
7,961
8,095
72.8
.76
Organic matter digestion, %b Ruminal Postruminal Total tract Postruminal organic matter digestion coefficient
56.6 27.0 8~.5
59.7 23.0 82.4
62.1
56.0
1.7
.1045
.77 .82 .82
.0612 .0225 .5228
Starch digestion, %b Ruminal Postruminal Total tract Postruminal starch digestion coefficient
58.4 37.5 95.9
60.4 33.8 94.2
1.3 1.4 .4
.4601 .2007 .0349
90.4
84.9
1.1
.0291
NDF digestion, %b Ruminal Postruminal Total tract Postruminal digestion coefficientc
58.4 18.7 77.1 33.9
61.1 14.5 75.6 29.3
1.9 2.3 1.6 3.2
.5044 .3838 .6482 .4906
Fecal pH
6.47
6.35
.05
.2157
Abomasal pH
2.56
2.68
.04
.1537
astandard error of means calculated on an organic matter basis. bpercentage of organic matter, starch or NDF intake. Cpercentage of organic matter, starch or NDF available.
These d a t a suggest t h a t t h e increased digest i o n o b s e r v e d b y V a r n e r and W o o d s (1972) w i t h l i m e s t o n e a d d i t i o n s m a y be related to i m p r o v e d p o s t r u m i n a l n u t r i e n t digestion. T h e exact means by which limestone may improve p o s t r u m i n a l digestion c a n n o t be d e t e r m i n e d f r o m t h e s e data. H o w e v e r , Russell et al. (1981) i n d i c a t e d t h a t in s o m e cases, small intestinal starch d i g e s t i o n m a y be increased 20 p e r c e n t a g e units b y an increase in small i n t e s t i n e pH. T h e r e f o r e , t h e i m p r o v e m e n t in digestion m a y be r e l a t e d t o t h e b u f f e r i n g ability o f l i m e s t o n e .
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