Abstract
Abstract Genetic variation for forage yield of orchardgrass is abundant, but there are few reports of progress from selection for increased forage yield. The objective of this study was to estimate direct effects of selection from one cycle of half‐sib family selection for forage yield in orchardgrass. Eleven selected populations were compared with their parent populations within three maturity groups. Populations were evaluated under hay management at three locations and management‐intensive rotational grazing at two locations. Nine of the 11 selected populations differed, by an average of 7.4%, from their parent population in forage yield. Nine of the selected populations also showed changes in Drechslera leafspot reaction, all indicating a negative genetic correlation with forage yield. Selection for high forage yield tended to result in greater ground cover and later relative maturity. However, changes in net herbage accumulation (NHA) under rotational grazing were generally not significant and were uncorrelated with changes in forage yield, indicating that forage yield of hay plots is not correlated with the NHA of grazed plots. Although genetic gains in forage yield measured under hay management were very favourable relative to other reports from the literature, the lack of correlated progress under grazing management indicates that directed selection for NHA of orchardgrass should be conducted under grazing management.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Nine of eleven selected orchardgrass populations differed from parents in forage yield by an average of 7.4%.
- Taxon
- orchardgrass
.jpg?width=60)
Dactylis glomeratat0 - Treatment
- selected populationse0
- Outcome
- forage yielde0
- Direction
- differede0
- Value
- 7.4%e0
- Comparator
- parent populatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Nine of the 11 selected populations differed, by an average of 7.4%, from their parent population in forage yield”
t0“orchardgrass”
Claim · model-written summary
Nine selected populations changed in Drechslera leafspot reaction, indicating a negative genetic correlation with forage yield.
- Taxon
- orchardgrassDactylis glomeratat0
- Material
- selected populationse0
- Interactor
- Drechslera
Drechslerae0pathogen - Outcome
- Drechslera leafspot reactione0
- Direction
- negativee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nine of the selected populations also showed changes in Drechslera leafspot reaction, all indicating a negative genetic correlation with forage yield”
t0“orchardgrass”
Claim · model-written summary
Selection for high forage yield tended to increase ground cover and delay relative maturity.
- Taxon
- orchardgrassDactylis glomeratat0
- Treatment
- Selection for high forage yielde0
- Outcome
- ground cover and later relative maturitye0
- Direction
- greatere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Selection for high forage yield tended to result in greater ground cover and later relative maturity”
t0“orchardgrass”
Claim · model-written summary
Changes in net herbage accumulation under grazing were generally not significant.
- Taxon
- orchardgrassDactylis glomeratat0
- Outcome
- net herbage accumulation (NHA)e0
- Setting
- rotational grazinge0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“changes in net herbage accumulation (NHA) under rotational grazing were generally not significant”
t0“orchardgrass”
Claim · model-written summary
Changes in net herbage accumulation under grazing were uncorrelated with changes in forage yield.
- Taxon
- orchardgrassDactylis glomeratat0
- Outcome
- forage yield of hay plotse0
- Direction
- uncorrelatede0
- Comparator
- NHA of grazed plotse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“were uncorrelated with changes in forage yield, indicating that forage yield of hay plots is not correlated with the NHA of grazed plots”
t0“orchardgrass”
Claim · model-written summary
The authors recommend selection for orchardgrass net herbage accumulation under grazing management.
- Taxon
- orchardgrassDactylis glomeratae0
- Outcome
- directed selection for NHA of orchardgrass should be conducted under grazing managemente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“directed selection for NHA of orchardgrass should be conducted under grazing management”