Linked Life Data

7668977

Source:http://linkedlifedata.com/resource/pubmed/id/7668977

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1995-10-12
pubmed:abstractText
The effects of, and interactions between, the diet and maturity of grass were studied in cattle in a 6 x 6 Latin square experiment with a 2 x 3 factorial arrangement of treatments. Barn-dried grass or direct-cut silage from the same sward were fed together with 250 (L), 500 (M) or 750 (H) g concentrate dry matter (DM) kg-1 total DM. Six timothy-meadow fescue grasses, cut at 7 d intervals, were incubated in nylon bags in the rumen for 6, 12, 24, 48, 72 and 96 h, and the kinetics parameters for DM and neutral detergent fibre (NDF) digestion were estimated. Ruminal NDF digestibility was calculated using a value of 0.02 for the rate of passage. With increasing maturity of grass, crude protein content and in vitro digestibility decreased with associated increases in the contents of cell wall constituents. Both the rate and extent of DM and NDF digestion decreased with maturity. The changes were curvilinear with an increasing depression in the extent of digestion and a decreasing depression in the rate of digestion with maturity. Ruminal NDF digestibility averaged over the diets decreased from 61.2 to 39.7% with the maturity. DM and NDF disappearance and calculated NDF digestibility decreased as the proportion of concentrate in the diet increased. This adverse effect of concentrate increased more rapidly as the proportion of concentrate increased from M to H and rumen pH dropped from 6.2 to 6.0 than as the proportion of concentrate increased from L to M with a consequent reduction in rumen pH from 6.4 to 6.2. The minimum rumen pH explained more of the variation in NDF digestibility than mean pH, duration or summation (pH x time) of the pH depression below 6.2, 6.0 or 5.8. Predicted NDF digestibility was higher in cattle given the dried grass diets than in those given the silage diets. The adverse effect of the concentrate level on NDF digestibility increased with the maturity of the grass. The decrease was 0.54, 0.59, 0.72% units per one day delay in cutting for low, medium and high levels of concentrate, respectively.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0003-942X
pubmed:author
pubmed:issnType
Print
pubmed:volume
47
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
153-67
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Influence of grass maturity and diet on ruminal dry matter and neutral detergent fibre digestion kinetics.
pubmed:affiliation
Department of Animal Science, University of Helsinki, Finland.
pubmed:publicationType
Journal Article, Comparative Study