Abstract
Abstract Forage dry matter (DM) yield and its nutrient content are important in livestock nutrition; however, they have distinct, even opposite responses to mowing regimes. To optimize forage resources, two independent field experiments were conducted to determine effects of initial mowing time (15‐day intervals from May 15 to September 1) and mowing frequency (one to five times per year) on DM yield and nutritive value of Leymus chinensis (Trin.) Tzvel. The greatest cumulative DM yield (cDMY), pre‐mowing crude protein yield (pCPY) and cumulative crude protein yield (cCPY) were attained when initial mowing occurred from July 15 to August 15. The crude protein (CP) concentration of pDMY was higher, whereas fiber concentrations were lower, when initial mowing was from May 15 to June 15, with opposite results when the initial mowing was delayed (July 1 to September 30). When mowing three times annually, cDMY and cCPY of L. chinensis were higher ( p < .05) than with less frequent mowing. With more than three mowings, accumulated CP yield of L. chinensis was not significantly affected. With four or five yearly mowings, accumulated DM yield of L. chinensis decreased significantly compared to mowing one to three times. In conclusion, based on DM yield and nutritive value, the optimal initial mowing date ranged from July 15 to August 15, whereas optimal mowing frequency was three times yearly.
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Claims 11
Claim · model-written summary
Initial mowing from July 15 to August 15 gave the greatest cumulative dry matter yield.
- Treatment
- initial mowing occurred from July 15 to August 15e0
- Outcome
- cumulative DM yielde0
- Direction
- greateste0
Not reportedTaxonComparator
Verbatim
e0“The greatest cumulative DM yield (cDMY), pre‐mowing crude protein yield (pCPY) and cumulative crude protein yield (cCPY) were attained when initial mowing occurred from July 15 to August 15.”
Claim · model-written summary
Initial mowing from July 15 to August 15 gave the greatest pre-mowing crude protein yield.
- Treatment
- initial mowing occurred from July 15 to August 15e0
- Outcome
- pre‐mowing crude protein yielde0
- Direction
- greateste0
Not reportedTaxonComparator
Verbatim
e0“The greatest cumulative DM yield (cDMY), pre‐mowing crude protein yield (pCPY) and cumulative crude protein yield (cCPY) were attained when initial mowing occurred from July 15 to August 15.”
Claim · model-written summary
Initial mowing from July 15 to August 15 gave the greatest cumulative crude protein yield.
- Treatment
- initial mowing occurred from July 15 to August 15e0
- Outcome
- cumulative crude protein yielde0
- Direction
- greateste0
Not reportedTaxonComparator
Verbatim
e0“The greatest cumulative DM yield (cDMY), pre‐mowing crude protein yield (pCPY) and cumulative crude protein yield (cCPY) were attained when initial mowing occurred from July 15 to August 15.”
Claim · model-written summary
Early initial mowing increased crude protein concentration.
- Treatment
- initial mowing was from May 15 to June 15e0
- Outcome
- crude protein (CP) concentration of pDMYe0
- Direction
- highere0
- Comparator
- initial mowing was delayed (July 1 to September 30)e0
Not reportedTaxon
Verbatim
e0“The crude protein (CP) concentration of pDMY was higher, whereas fiber concentrations were lower, when initial mowing was from May 15 to June 15, with opposite results when the initial mowing was delayed (July 1 to September 30).”
Claim · model-written summary
Early initial mowing lowered fiber concentrations.
- Treatment
- initial mowing was from May 15 to June 15e0
- Outcome
- fiber concentrationse0
- Direction
- lowere0
- Comparator
- initial mowing was delayed (July 1 to September 30)e0
Not reportedTaxon
Verbatim
e0“The crude protein (CP) concentration of pDMY was higher, whereas fiber concentrations were lower, when initial mowing was from May 15 to June 15, with opposite results when the initial mowing was delayed (July 1 to September 30).”
Claim · model-written summary
Three annual mowings increased cumulative dry matter yield compared with less frequent mowing.
Verbatim
e0“When mowing three times annually, cDMY and cCPY of L. chinensis were higher ( p < .05) than with less frequent mowing.”
Claim · model-written summary
Three annual mowings increased cumulative crude protein yield compared with less frequent mowing.
Verbatim
e0“When mowing three times annually, cDMY and cCPY of L. chinensis were higher ( p < .05) than with less frequent mowing.”
Claim · model-written summary
More than three mowings did not significantly affect accumulated crude protein yield.
- Taxon
- L. chinensisLeymus chinensise0
- Treatment
- more than three mowingse0
- Outcome
- accumulated CP yielde0
Not reportedComparatorDirection
Verbatim
e0“With more than three mowings, accumulated CP yield of L. chinensis was not significantly affected.”
Claim · model-written summary
Four or five annual mowings significantly reduced accumulated dry matter yield compared with one to three.
Verbatim
e0“With four or five yearly mowings, accumulated DM yield of L. chinensis decreased significantly compared to mowing one to three times.”
Claim · model-written summary
The authors recommend initial mowing between July 15 and August 15.
- Outcome
- optimal initial mowing date ranged from July 15 to August 15e0
Not reportedTaxon
Verbatim
e0“the optimal initial mowing date ranged from July 15 to August 15, whereas optimal mowing frequency was three times yearly.”
Claim · model-written summary
The authors recommend mowing three times yearly.
- Outcome
- optimal mowing frequency was three times yearlye0
Not reportedTaxon
Verbatim
e0“the optimal initial mowing date ranged from July 15 to August 15, whereas optimal mowing frequency was three times yearly.”
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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.