Abstract
SUMMARY The current experiment was undertaken to investigate the effect of including white clover ( Trifolium repens L.; WC) into perennial ryegrass ( Lolium perenne L.; PRG) swards (PRG/WC) receiving 250 kg nitrogen (N) per hectare (ha) per year compared with PRG only swards receiving 250 kg N/ha/year, in an intensive grass-based spring calving dairy production scenario. Forty spring-calving cows were allocated to graze either a PRG/WC or PRG sward ( n = 20) from 6 February to 31 October 2012. Fresh herbage was offered daily (17 kg dry matter (DM)/cow) supplemented with concentrate in times of herbage deficit (total supplementation 507 kg/cow). Pre-grazing herbage mass (HM), sward WC content and milk production were measured for the duration of the experiment. Herbage DM intake was estimated in May, July and September. Pre-grazing HM (± s.e. ) was similar (1467 ± 173·1 kg DM/ha) for both treatments, as was cumulative herbage production (14 158 ± 769 kg DM/ha). Average WC content of the PRG/WC swards was 236 ± 30 g/kg DM. The PRG/WC cows had greater average daily milk yield and milk solids yield from June onwards. Cumulative milk yield and milk solids yield were greater for the PRG/WC cows compared with the PRG cows (5048 and 4789 ± 34·3 kg milk yield/cow, and 400 and 388 ± 1·87 kg milk solids/cow, respectively). Cows had similar DM intake in all measurements periods (15·1 ± 0·42 kg DM/cow/day). In conclusion, including WC in N-fertilized PRG swards increased milk production from cows grazing the PRG/WC swards compared with PRG, particularly in the second half of the lactation.
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Claims 7
Claim · model-written summary
Pre-grazing herbage mass was similar across mixed and ryegrass-only swards.
- Taxon
- perennial ryegrass
Lolium perennet0 - Treatment
- white clovert0
- Outcome
- Pre-grazing HMe0
- Direction
- similare0
- Value
- 1467 ± 173·1 kg DM/hae0
- Comparator
- both treatmentse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-grazing HM (± s.e. ) was similar (1467 ± 173·1 kg DM/ha) for both treatments”
t0“white clover in nitrogen fertilized perennial ryegrass”
Claim · model-written summary
Cumulative herbage production was similar across sward treatments.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- white clovert0
- Outcome
- cumulative herbage productione0
- Value
- 14 158 ± 769 kg DM/hae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“as was cumulative herbage production (14 158 ± 769 kg DM/ha).”
t0“white clover in nitrogen fertilized perennial ryegrass”
Claim · model-written summary
Mixed swards averaged 236 ± 30 g/kg DM white clover.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- WC contente0
- Value
- 236 ± 30 g/kg DMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average WC content of the PRG/WC swards was 236 ± 30 g/kg DM.”
t0“perennial ryegrass”
Claim · model-written summary
Cows on mixed swards had greater daily milk yield and milk solids yield from June.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- PRG/WCe0
- Outcome
- average daily milk yield and milk solids yielde0
- Direction
- greatere0
- Qualifier
- from June onwardse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The PRG/WC cows had greater average daily milk yield and milk solids yield from June onwards.”
t0“perennial ryegrass”
Claim · model-written summary
Cumulative milk yield was greater on mixed swards, 5048 versus 4789 kg per cow.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- PRG/WCe0
- Outcome
- Cumulative milk yielde0
- Direction
- greatere0
- Value
- 5048 and 4789 ± 34·3 kg milk yield/cowe0
- Comparator
- PRG cowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative milk yield and milk solids yield were greater for the PRG/WC cows compared with the PRG cows (5048 and 4789 ± 34·3 kg milk yield/cow, and 400 and 388 ± 1·87 kg milk solids/cow, respectively).”
t0“perennial ryegrass”
Claim · model-written summary
Cumulative milk solids yield was greater on mixed swards, 400 versus 388 kg per cow.
- Taxon
- perennial ryegrassLolium perennet0
- Treatment
- PRG/WCe0
- Outcome
- milk solids yielde0
- Direction
- greatere0
- Value
- 400 and 388 ± 1·87 kg milk solids/cowe0
- Comparator
- PRG cowse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cumulative milk yield and milk solids yield were greater for the PRG/WC cows compared with the PRG cows (5048 and 4789 ± 34·3 kg milk yield/cow, and 400 and 388 ± 1·87 kg milk solids/cow, respectively).”
t0“perennial ryegrass”
Claim · model-written summary
Cow dry matter intake was similar across measurement periods.
- Taxon
- perennial ryegrassLolium perennet0
- Outcome
- DM intakee0
- Direction
- similare0
- Value
- 15·1 ± 0·42 kg DM/cow/daye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Cows had similar DM intake in all measurements periods (15·1 ± 0·42 kg DM/cow/day).”
t0“perennial ryegrass”
The same questions in other papers
Trifolium repens · yield · Lolium perenne (perennial ryegrass)Positive and negative results
2 papers in the same direction as this paper · 3 in the opposite direction
- positive
- positive
- positive
2 papers more in this group
See all 6 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.