Abstract
In western Canada, short-season corn silage production is increasing due to its potentially high nutritive value. The objective of this study was to determine variability and relationships among nutrient concentration, degradability, and methane (CH 4 ) production of short-season whole-plant corn hybrids harvested before or after light frost (−1.5 °C). Four hybrids, based on their corn heat unit rating (≤2600, CHU rating), were grown in 2 yr in central and southern Alberta (AB) with two field replications. The batch culture and Daisy fermenter techniques were used to characterize degradability and gas production measurements. At both locations, dry matter (DM) concentration was affected by harvest and hybrid (P ≤ 0.02). However, starch and neutral detergent fiber (NDF) concentrations differed (P ≤ 0.01) or tended (P = 0.07) to differ among harvest and hybrid only in central AB. Over both locations and harvest times, CH 4 production was related negatively to propionate and positively to acetate proportions. In conclusion, harvesting southern AB hybrids after frost increased DM concentration and NDF degradability with no effect on CH 4 emissions, but the high DM concentration may negatively affect silage quality and animal performance. Harvesting central AB hybrids after frost increased DM and starch concentrations, while reducing CH 4 emissions but had limited effects on nutrient degradability.
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Claims 13
Claim · model-written summary
Dry matter concentration varied with harvest timing and hybrid at both locations.
Not reportedTaxonDirection
Verbatim
e0“At both locations, dry matter (DM) concentration was affected by harvest and hybrid (P ≤ 0.02).”
Claim · model-written summary
Starch concentration differed or tended to differ by harvest and hybrid only in central Alberta.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starch and neutral detergent fiber (NDF) concentrations differed (P ≤ 0.01) or tended (P = 0.07) to differ among harvest and hybrid only in central AB.”
t0“corn hybrids”
Claim · model-written summary
NDF concentration differed or tended to differ by harvest and hybrid only in central Alberta.
- Taxon
- corn
Zea mays subsp. mayst0 - Material
- hybride0
- Treatment
- harveste0
- Outcome
- neutral detergent fiber (NDF) concentrationse0
- Setting
- central ABe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“starch and neutral detergent fiber (NDF) concentrations differed (P ≤ 0.01) or tended (P = 0.07) to differ among harvest and hybrid only in central AB.”
t0“corn hybrids”
Claim · model-written summary
Methane production was negatively related to propionate proportions.
- Taxon
- cornZea mays subsp. mayst0
- Compound
- propionatee0
- Outcome
- CH 4 productione0
- Direction
- negativelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over both locations and harvest times, CH 4 production was related negatively to propionate and positively to acetate proportions.”
t0“corn hybrids”
Claim · model-written summary
Methane production was positively related to acetate proportions.
- Taxon
- cornZea mays subsp. mayst0
- Compound
- acetatee0
- Outcome
- CH 4 productione0
- Direction
- positivelye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Over both locations and harvest times, CH 4 production was related negatively to propionate and positively to acetate proportions.”
t0“corn hybrids”
Claim · model-written summary
Harvesting southern Alberta corn hybrids after frost increased dry matter concentration.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- harvesting southern AB hybrids after froste0
- Outcome
- DM concentratione0
- Direction
- increasede0
- Setting
- southern ABe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvesting southern AB hybrids after frost increased DM concentration and NDF degradability with no effect on CH 4 emissions”
t0“corn hybrids”
Claim · model-written summary
Harvesting southern Alberta hybrids after frost increased NDF degradability.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- harvesting southern AB hybrids after froste0
- Outcome
- NDF degradabilitye0
- Direction
- increasede0
- Setting
- southern ABe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvesting southern AB hybrids after frost increased DM concentration and NDF degradability with no effect on CH 4 emissions”
t0“corn hybrids”
Claim · model-written summary
Harvesting southern Alberta hybrids after frost had no effect on methane emissions.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- harvesting southern AB hybrids after froste0
- Outcome
- CH 4 emissionse0
- Direction
- no effecte0
- Setting
- southern ABe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“harvesting southern AB hybrids after frost increased DM concentration and NDF degradability with no effect on CH 4 emissions”
t0“corn hybrids”
Claim · model-written summary
High dry matter concentration may harm silage quality and animal performance.
- Taxon
- cornZea mays subsp. mayst0
- Outcome
- silage quality and animal performancee0
- Direction
- negativelye0
- Qualifier
- maye0
Not reportedOrgan / stage
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the high DM concentration may negatively affect silage quality and animal performance.”
t0“corn hybrids”
Claim · model-written summary
Harvesting central Alberta hybrids after frost increased dry matter concentration.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Harvesting central AB hybrids after froste0
- Outcome
- DMe0
- Direction
- increasede0
- Setting
- central ABe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvesting central AB hybrids after frost increased DM and starch concentrations, while reducing CH 4 emissions but had limited effects on nutrient degradability.”
t0“corn hybrids”
Claim · model-written summary
Harvesting central Alberta hybrids after frost increased starch concentration.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Harvesting central AB hybrids after froste0
- Outcome
- starch concentrationse0
- Direction
- increasede0
- Setting
- central ABe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvesting central AB hybrids after frost increased DM and starch concentrations, while reducing CH 4 emissions but had limited effects on nutrient degradability.”
t0“corn hybrids”
Claim · model-written summary
Harvesting central Alberta hybrids after frost reduced methane emissions.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Harvesting central AB hybrids after froste0
- Outcome
- CH 4 emissionse0
- Direction
- reducinge0
- Setting
- central ABe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvesting central AB hybrids after frost increased DM and starch concentrations, while reducing CH 4 emissions but had limited effects on nutrient degradability.”
t0“corn hybrids”
Claim · model-written summary
Harvesting central Alberta hybrids after frost had limited effects on nutrient degradability.
- Taxon
- cornZea mays subsp. mayst0
- Treatment
- Harvesting central AB hybrids after froste0
- Outcome
- nutrient degradabilitye0
- Setting
- central ABe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Harvesting central AB hybrids after frost increased DM and starch concentrations, while reducing CH 4 emissions but had limited effects on nutrient degradability.”
t0“corn hybrids”
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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.