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    • Journal of Range Management, Volume 43 (1990)
    • Journal of Range Management, Volume 43, Number 3 (May 1990)
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    Variability of crude protein in crested wheatgrass at defined stages of phenology

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    Author
    Angell, R. F.
    Miller, R. F.
    Haferkamp, M. R.
    Issue Date
    1990-05-01
    Keywords
    supplementary feeds
    weather
    Agropyron desertorum
    protein content
    spring
    regrowth
    Oregon
    steers
    crude protein
    phenology
    nutritive value
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    Citation
    Angell, R. F., Miller, R. F., & Haferkamp, M. R. (1990). Variability of crude protein in crested wheatgrass at defined stages of phenology. Journal of Range Management, 43(3), 186-189.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644957
    DOI
    10.2307/3898668
    Additional Links
    https://rangelands.org/
    Abstract
    Variability of crude protein concentration in crested wheatgrass (Agropyron desertorum (Fisch. ex Link) Schult) is an important consideration in the development of grazing programs. Crude protein (CP) concentration in crested wheatgrass was monitored at specific stages of phenology for 5 years. During that time September through August precipitation varied from 68 to 142% of the 37-year mean. Vegetation was clipped once at 10 phenological stages beginning in April. At the last clipping date, in mid-August, regrowth accumulated after prior clippings was collected. Over the 5-year period, CP of vegetation clipped during mid vegetative growth in late April varied 35%, relatively, from 14.7% in 1983 to 9.5% during 1985. Even though 1984 crop year precipitation exceeded 1983 by 84 mm, maximum topgrowth biomass was 449 kg/ha lower in 1984. Also, CP percentage of vegetative growth in April was 1.8% lower in 1984 than in 1983. Regrowth CP was positively correlated (r=0.98) with June precipitation, and with the number of rain events in July (r=0.97). Plants clipped in the boot stage had greater forage CP in August than plants clipped prior to boot stage. However, regrowth biomass was affected by soil water availability and was highly variable. Crude protein in vegetative growth was marginal for growing steers in 1985. Although growing stock are often supplemented in late summer, these data are interpreted to show that spring supplementation may be needed some years.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898668
    Scopus Count
    Collections
    Journal of Range Management, Volume 43, Number 3 (May 1990)

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