Abstract
Abstract Perennial ryegrass ( Lolium perenne L.) evaluation trials are often conducted under simulated grazing to identify the most productive cultivars. It is unclear whether simulated grazing identifies the most productive cultivar for animal‐grazed swards. Ten cultivars were established as plots and managed concurrently under simulated grazing ( SG ), animal grazing ( AG ) and conservation ( CON ). The experiment lasted 3 years with dry‐matter ( DM ) off‐take, digestibility, tiller density and ground‐cover score recorded in all years. A good relationship existed between DM off‐take under SG and CON ( R 2 = 0·73). The relationship between SG and AG was strongest in year 2 and 3 ( R 2 = 0·53 and 0·55 respectively). High DM production was observed in SG swards in year 1; this was weakly related to the DM production of the AG sward. Across the 3 years, the CON treatment had higher yields than either of the other two treatments and was poorly correlated to DM yield under AG , confirming that cultivars should be evaluated under a similar defoliation frequency to their intended use. Tiller density declined quickest under CON and slowest under AG . Some reranking of cultivars occurred between defoliation managements. The results show that simulated grazing is a useful indicator of DM yield performance of animal‐grazed swards.
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Claims 11
Claim · model-written summary
Dry matter off-take under simulated grazing and conservation was related, with R² 0.73.
- Taxon
- Perennial ryegrass
Lolium perennet0 - Treatment
- SGe0
- Outcome
- DM off‐takee0
- Value
- R 2 = 0·73e0
- Comparator
- CONe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A good relationship existed between DM off‐take under SG and CON ( R 2 = 0·73).”
t0“Perennial ryegrass”
Claim · model-written summary
The simulated to animal grazing dry matter relationship had R² 0.53 in year 2.
- Taxon
- Perennial ryegrassLolium perennet0
- Outcome
- relationship between SG and AGe0
- Value
- R 2 = 0·53e0
- Qualifier
- year 2e0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between SG and AG was strongest in year 2 and 3 ( R 2 = 0·53 and 0·55 respectively).”
t0“Perennial ryegrass”
Claim · model-written summary
The simulated to animal grazing dry matter relationship had R² 0.55 in year 3.
- Taxon
- Perennial ryegrassLolium perennet0
- Outcome
- relationship between SG and AGe0
- Value
- 0·55e0
- Qualifier
- year 2 and 3e0
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relationship between SG and AG was strongest in year 2 and 3 ( R 2 = 0·53 and 0·55 respectively).”
t0“Perennial ryegrass”
Claim · model-written summary
Year-one simulated grazing dry matter production was high but weakly related to animal grazing production.
- Taxon
- Perennial ryegrassLolium perennet0
- Treatment
- SGe0
- Outcome
- DM productione0
- Qualifier
- year 1e0
- Comparator
- AG swarde0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“High DM production was observed in SG swards in year 1; this was weakly related to the DM production of the AG sward.”
t0“Perennial ryegrass”
Claim · model-written summary
Conservation had higher yields than either grazing regime over three years.
- Taxon
- Perennial ryegrassLolium perennet0
- Treatment
- CON treatmente0
- Outcome
- yieldse0
- Direction
- highere0
- Qualifier
- 3 yearse0
- Comparator
- other two treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Across the 3 years, the CON treatment had higher yields than either of the other two treatments”
t0“Perennial ryegrass”
Claim · model-written summary
Conservation dry matter yield was poorly correlated with animal grazing yield.
- Taxon
- Perennial ryegrassLolium perennet0
- Treatment
- CONe0
- Outcome
- DM yielde0
- Comparator
- AGe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the CON treatment had higher yields than either of the other two treatments and was poorly correlated to DM yield under AG”
t0“Perennial ryegrass”
Claim · model-written summary
Tiller density fell fastest under conservation.
- Taxon
- Perennial ryegrassLolium perennet0
- Treatment
- CONe0
- Outcome
- Tiller densitye0
- Direction
- declined quickeste0
- Comparator
- AGe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tiller density declined quickest under CON and slowest under AG .”
t0“Perennial ryegrass”
Claim · model-written summary
Tiller density fell slowest under animal grazing.
- Taxon
- Perennial ryegrassLolium perennet0
- Treatment
- AGe0
- Outcome
- Tiller densitye0
- Direction
- sloweste0
- Comparator
- CONe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Tiller density declined quickest under CON and slowest under AG .”
t0“Perennial ryegrass”
Claim · model-written summary
Some cultivars changed rank across defoliation managements.
- Taxon
- Perennial ryegrassLolium perennet0
- Treatment
- defoliation managementse0
- Outcome
- reranking of cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Some reranking of cultivars occurred between defoliation managements.”
t0“Perennial ryegrass”
Claim · model-written summary
Simulated grazing was found useful for indicating animal grazing dry matter yield performance.
- Taxon
- Perennial ryegrassLolium perennet0
- Outcome
- DM yield performancee0
- Comparator
- animal‐grazed swardse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“simulated grazing is a useful indicator of DM yield performance of animal‐grazed swards.”
t0“Perennial ryegrass”
Claim · model-written summary
The authors recommend evaluating cultivars at defoliation frequencies similar to intended use.
- Taxon
- Perennial ryegrassLolium perennet0
- Outcome
- evaluated under a similar defoliation frequency to their intended usee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cultivars should be evaluated under a similar defoliation frequency to their intended use.”
t0“Perennial ryegrass”
The same questions in other papers
grazing · yield · Lolium perenne (perennial ryegrass)Positive and negative results
20 papers in the same direction as this paper · 10 in the opposite direction · 1 reporting no difference from an alternative
- positive
- positive
- no effect
28 papers more in this group
See all 32 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.