Abstract
Abstract Phenological indexes that account for variation in chemicál composition of herbage would be valuable to farmers and researchers. Hence, the objective of this study was to relate neutral detergent fiber (NDF) and in vitro digestible dry‐matter (IVDDM) concentrations in herbage and plant parts of alfalfa ( Medicago sativa L.), red clover ( Trifolium pratense L.), timothy ( Phleum pratense L.), and smooth bromegrass ( Bromus inermis Leyss.) to phenological development of each species. Four replicate plots of each species were harvested at four 2‐wk intervals during the spring of 2 yr. Alfalfa was separated into leaves (including flowers) and stems; red clover into leaflets (including flowers), petioles, and stems; and bromegrass and timothy into leaf blades and stems (including sheaths). Herbage from two plots of each species was scored for phenological stage according to a species‐specific index and a mean stage number (mean stage by weight, MSW) was calculated. For each plant part, NDF and IVDDM concentrations were regressed on MSW across years. Alfalfa leaves remained constant in NDF (206 g kg −1 dry matter, DM) and IVDDM (783 g kg −1 DM) with increasing MSW; however, MSW accounted for 97% of the variation in NDF and IVDDM concentrations of alfalfa stems and herbage. Herbage concentrations of NDF and IVDDM were more closely related to MSW than were concentrations of NDF and IVDDM in leaflets, stems, or petioles of red clover, and leaf blades and stems of bromegrass and timothy. Only in alfalfa did MSW adequately account for variation in NDF and IVDDM of herbage and plant parts. Phenological models for the other species adequately accounted for variation in some, but not all, plant parts.
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Claims 7
Claim · model-written summary
Alfalfa leaves kept NDF constant at 206 g kg −1 dry matter with increasing MSW.
- Taxon
- Alfalfa
Medicago sativae0 - Organ / stage
- leavese0
- Treatment
- increasing MSWe0
- Outcome
- NDFe0
- Direction
- remained constante0
- Value
- 206 g kg −1 dry mattere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa leaves remained constant in NDF (206 g kg −1 dry matter, DM) and IVDDM (783 g kg −1 DM) with increasing MSW”
Claim · model-written summary
Alfalfa leaves kept IVDDM constant at 783 g kg −1 DM with increasing MSW.
- Taxon
- AlfalfaMedicago sativae0
- Organ / stage
- leavese0
- Treatment
- increasing MSWe0
- Outcome
- IVDDMe0
- Direction
- remained constante0
- Value
- 783 g kg −1 DMe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa leaves remained constant in NDF (206 g kg −1 dry matter, DM) and IVDDM (783 g kg −1 DM) with increasing MSW”
Claim · model-written summary
MSW accounted for 97% of the variation in NDF and IVDDM of alfalfa stems and herbage.
- Taxon
- alfalfaMedicago sativae1
- Organ / stage
- stemse1
- Treatment
- MSWe1
- Outcome
- NDF and IVDDM concentrationse1
- Value
- 97%e1
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“MSW accounted for 97% of the variation in NDF and IVDDM concentrations of alfalfa stems and herbage”
Claim · model-written summary
Herbage NDF and IVDDM were more closely related to MSW than the concentrations in leaflets, stems or petioles of red clover.
- Taxon
- red clover
Trifolium pratensee2 - Treatment
- MSWe2
- Outcome
- NDF and IVDDMe2
- Direction
- more closely relatede2
- Comparator
- leaflets, stems, or petioles of red clovere2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“Herbage concentrations of NDF and IVDDM were more closely related to MSW than were concentrations of NDF and IVDDM in leaflets, stems, or petioles of red clover, and leaf blades and stems of bromegrass and timothy”
Claim · model-written summary
Herbage NDF and IVDDM were more closely related to MSW than the concentrations in leaf blades and stems of bromegrass and timothy.
Verbatim
e2“Herbage concentrations of NDF and IVDDM were more closely related to MSW than were concentrations of NDF and IVDDM in leaflets, stems, or petioles of red clover, and leaf blades and stems of bromegrass and timothy”
Claim · model-written summary
Only in alfalfa did MSW adequately account for the variation in NDF and IVDDM of herbage and plant parts.
- Taxon
- alfalfaMedicago sativae4
- Treatment
- MSWe4
- Outcome
- variation in NDF and IVDDMe4
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Only in alfalfa did MSW adequately account for variation in NDF and IVDDM of herbage and plant parts”
Claim · model-written summary
Phenological models for the other species adequately accounted for variation in some, but not all, plant parts.
- Taxon
- other speciese5
- Treatment
- Phenological modelse5
- Outcome
- variatione5
- Qualifier
- in some, but not all, plant partse5
Not reportedDirection
Verbatim
e5“Phenological models for the other species adequately accounted for variation in some, but not all, plant parts”