Pine needle effects on in vivo and in vitro digestibility of crested wheatgrass
Issue Date
1992-05-01Keywords
nitrogen retentionlambs
toxicity
conifer needles
Agropyron desertorum
Pinus ponderosa
fiber content
digestibility
crude protein
diets
in vitro digestibility
forage
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Adams, D. C., Pfister, J. A., Short, R. E., Cates, R. G., Knapp, B. W., & Wiedmeier, R. D. (1992). Pine needle effects on in vivo and in vitro digestibility of crested wheatgrass. Journal of Range Management, 45(3), 249-253.Publisher
Society for Range ManagementJournal
Journal of Range ManagementDOI
10.2307/4002972Additional Links
https://rangelands.org/Abstract
In vitro and in vivo digestion trials with lambs were conducted to determine effects of ponderosa pine needles (PN; Pinus ponderosa Laws.) on digestibility of crested wheatgrass (CW; Agropyron desertorum [Link] Schultes) hay. Pine needles contained shikimic acid (15-28 mg/g) and several monomeric phenolics (p-hydroxy benzoid acid, caffeic acid, p-coumaric acid, ferulic acid) and flavonoids. Tannin concentration exceeded assay limits (>10%) and terpenes were not found, probably due to the drying procedure. In the in vitro trial, needles were mixed with CW in 10% increments from 0% to 100%. In the in vivo trial, PN were fed to lambs as follows: (1) 0%, (2) 12.5%, (3) 25%, and (4) 50%, with the remainder of the diet as CW. In vitro organic matter digestibility (IVOMD) was regressed on level of PN in the substrate. As the proportion of PN increased, IVOMD declined cubicly (P<0.01). The IVOMD values ranged from 54% for 100% CW to 24% for 100% PN. In vivo digestibility of organic matter, neutral detergent fiber and acid detergent fiber declined linearly (P<0.01) as PN were increased from 0% to 50% of the diet. Apparent crude protein digestibility and N retention by lambs declined cubicly (P = 0.02 and P<0.01, respectively) and urinary N increased cubicly (P<0.01) as dietary PN increased from 0% to 50%. We concluded that PN reduce in vitro and in vivo nutrient digestibility, reduced N retention by lambs, and effects were detectable even at low levels.Type
textArticle
Language
enISSN
0022-409Xae974a485f413a2113503eed53cd6c53
10.2307/4002972