Abstract
Both quantity and quality of pasture forage produced generally varies with frequency and intensity of plant defoliation. However, intensity and frequency of defoliation have rarely been evaluated simultaneously. The objective of this study was to quantify forage quality response to simultaneous changes in defoliation treatments over a range of values likely to occur in short-duration graxing systems. Effects of defoliation treatments on forage digestibility (DMD), crude protein content (CPC), crude protein yield, and digestible dry matter yield were evaluated on a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture growing on a Ultic Hapioxeroll soil near Corvallis, Oregon. Treatments consisted of all possible combinations of 4 defoliation intervals (clipped every 7, 21, 35, or 49 days) and 3 stubble heights (High-70, Medium-55, or Low-40 mm of stubble remaining after defoliation) applied during the 1980, 1981, and 1982 growing seasons. Digestible dry matter yield increased with increasing defoliation interval. With the exception of DMD in 1980, both digestibility and CPC of the forage produced decreased linearly as the period between defoliation events Increased. Crude protein content increased linearly as stubble height Increased, while forage digestibility was comparatively insensitive to changes in stubble height. Forage quality was generally adequate on all treatments to meet the needs of most classes of livestock.
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Claims 6
Claim · model-written summary
Digestible dry matter yield rose with longer defoliation intervals.
- Taxon
- perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.)e1
- Treatment
- increasing defoliation intervale0
- Outcome
- Digestible dry matter yielde0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Digestible dry matter yield increased with increasing defoliation interval.”
t0“Defoliation Frequency and Intensity Effects on Pasture Forage Quality”
e1“a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture”
Claim · model-written summary
Forage digestibility decreased with longer defoliation intervals except for DMD in 1980.
- Taxon
- Lolium perenne
Lolium perennee1 - Treatment
- period between defoliation eventse0
- Outcome
- digestibilitye0
- Direction
- decreased linearlye0
- Qualifier
- exception of DMD in 1980e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the exception of DMD in 1980, both digestibility and CPC of the forage produced decreased linearly as the period between defoliation events Increased.”
t0“Defoliation Frequency and Intensity Effects on Pasture Forage Quality”
e1“a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture”
Claim · model-written summary
Crude protein content decreased with longer defoliation intervals.
- Taxon
- Lolium perenneLolium perennee1
- Treatment
- period between defoliation eventse0
- Outcome
- CPCe0
- Direction
- decreased linearlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“With the exception of DMD in 1980, both digestibility and CPC of the forage produced decreased linearly as the period between defoliation events Increased.”
t0“Defoliation Frequency and Intensity Effects on Pasture Forage Quality”
e1“a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture”
Claim · model-written summary
Crude protein content increased with stubble height.
- Taxon
- Lolium perenneLolium perennee1
- Treatment
- stubble heighte0
- Outcome
- Crude protein contente0
- Direction
- increased linearlye0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crude protein content increased linearly as stubble height Increased, while forage digestibility was comparatively insensitive to changes in stubble height.”
t0“Defoliation Frequency and Intensity Effects on Pasture Forage Quality”
e1“a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture”
Claim · model-written summary
Forage digestibility was comparatively insensitive to stubble height.
- Taxon
- Lolium perenneLolium perennee1
- Treatment
- stubble heighte0
- Outcome
- forage digestibilitye0
- Direction
- comparatively insensitivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Crude protein content increased linearly as stubble height Increased, while forage digestibility was comparatively insensitive to changes in stubble height.”
t0“Defoliation Frequency and Intensity Effects on Pasture Forage Quality”
e1“a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture”
Claim · model-written summary
Forage quality across treatments was generally adequate for most livestock classes.
- Taxon
- Lolium perenneLolium perennee1
- Outcome
- Forage qualitye0
- Qualifier
- generally adequate on all treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Forage quality was generally adequate on all treatments to meet the needs of most classes of livestock.”
t0“Defoliation Frequency and Intensity Effects on Pasture Forage Quality”
e1“a perennial ryegrass (Lolium perenne, L.)-subclover (Trgolium subterraneum L.) hill land pasture”
The same questions in other papers
pruning · quality: protein · Lolium perenne (perennial ryegrass)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- no effect
pruning · quality: grain · Lolium perenne (perennial ryegrass)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
- positive
- negative
pruning · yield · Lolium perenne (perennial ryegrass)Positive and negative results
21 papers in the same direction as this paper · 15 in the opposite direction · 2 reporting no difference from an alternative
- negative
- negative
- negative
35 papers more in this group
See all 39 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.