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    • Journal of Range Management, Volume 43 (1990)
    • Journal of Range Management, Volume 43, Number 5 (September 1990)
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    Supplementation and monensin effects on digesta kinetics. II. Cattle grazing winter range

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    Author
    Ward, M. G.
    Adams, D. C.
    Wallace, J. D.
    Galyean, M. L.
    Volesky, J. D.
    Issue Date
    1990-09-01
    Keywords
    pelleted feeds
    winter
    soybean meal
    steers
    digestibility
    crude protein
    digesta
    kinetics
    dietary supplements
    pH
    transit time
    barley
    natural grasslands
    cattle feeding
    monensin
    diets
    cattle
    protein supplements
    rumen fermentation
    Montana
    grazing
    feed intake
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    Citation
    Ward, M. G., Adams, D. C., Wallace, J. D., Galyean, M. L., & Volesky, J. D. (1990). Supplementation and monensin effects on digesta kinetics. II. Cattle grazing winter range. Journal of Range Management, 43(5), 383-386.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644941
    DOI
    10.2307/3898995
    Additional Links
    https://rangelands.org/
    Abstract
    Sixteen ruminally cannulated steers grazing Northern Great Plains native winter range were assigned to 4 treatments in a 2 X 2 factorial arrangement. Main effects were protein and monensin. A soybean meal-barley pellet (P; 26% crude protein) was fed at 0 and .8 kg head-1 d-1. Steers either received no monensin (M) or M was released at 101 ml/day via a ruminal delivery device. Forage intake, rmninal fermentation, in vivo organic matter (OM) digestibility, and ruminal fluid passage and particulate digesta kinetics were measured during trials in November and January. Esophageally fistulated steers were used to collect diet samples during each trial. Dietary crude protein was greater (P<0.01) in November (8.3%) than January (4.9%). Forage OM intake was not (P>0.10) influenced by either P or M. In vivo OM digestibility was increased (P<0.05) by P (60.6 vs 57.4%) and not affected (P>0.10) by M. Particulate passage rate increased (P<0.05) when P was combined with M. Ruminal fluid flow characteristics, fluid volume and pH were not affected (P>0.10) by either P or M. Ruminal ammonia-N was increased (P<0.01) by P (2.9 vs .6 mg/100 ml) and not affected (P>0.10) by M. Total ruminal volatile fatty acid concentrations, along with molar proportions of ruminal propionate and butyrate, were not affected (P>0.10) by P or M. Ruminal acetate was decreased (P<0.10) by P and not influenced (P>0.10) by M. We conclude that supplemental protein, through ruminal modifications, has beneficial effects on OM digestibility, and can thereby provide cattle grazing winter range with additional energy at a time when it is most crucial.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898995
    Scopus Count
    Collections
    Journal of Range Management, Volume 43, Number 5 (September 1990)

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