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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. I. Cattle grazing summer range

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    Author
    Ward, M. G.
    Adams, D. C.
    Wallace, J. D.
    Galyean, M. L.
    Knapp, B. W.
    Issue Date
    1990-09-01
    Keywords
    steers
    digestibility
    crude protein
    digesta
    kinetics
    dietary supplements
    pH
    transit time
    barley
    feed supplements
    natural grasslands
    summer
    cattle feeding
    monensin
    feed grains
    diets
    cattle
    rumen fermentation
    Montana
    grazing
    feed intake
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    Citation
    Ward, M. G., Adams, D. C., Wallace, J. D., Galyean, M. L., & Knapp, B. W. (1990). Supplementation and monensin effects on digesta kinetics. I. Cattle grazing summer range. Journal of Range Management, 43(5), 378-382.
    Publisher
    Society for Range Management
    Journal
    Journal of Range Management
    URI
    http://hdl.handle.net/10150/644940
    DOI
    10.2307/3898994
    Additional Links
    https://rangelands.org/
    Abstract
    Sixteen ruminally cannulated beef steers grazing native summer range in the Northern Great PIains were assigned to 4 treatments in a 2 X 2 factorial arrangement. Main effects were barley grain and monensin. Rolled barley (RB) containing 7.5% molasses was fed at 0 and 1.36 kg head-1 day-1. Steers received no monensin (M) or M released at 101 mg/d via a ruminal delivery device. Forage intake and digestibiIity, ruminal fermentation, and ruminal passage rate were measured during trials in: (1) June, (2) July, and (3) August. Diet samples were collected from esophogeally fistuIated steers during each trial. Dietary crude protein was greater (P<0.05) during trials 1 (15.2%)and 3 (14.3%) than in trial 2 (10.2%). In vivo organic matter (OM) digestibiiity, ruminal fluid passage rate, and fermentation variables varied by trial (P<0.01). Forage OM intake was reduced (P<0.10) by RB, but was not influenced (P>0.10) by M or the M and RB combination. In vivo OM digestibility was increased (P<0.05) by M, while RB had no effect. Particulate passage was not affected by M or RB but gastrointestinal tract fill was reduced by monensin (P<0.05). Ruminal fluid passage rate was affected by the RB X M X Trial interaction (P<0.05). Within June and July, fluid passage rate was similar among treatments and ranged from 14.0 to 11.3 %/h, respectively. During trial 3, a RB X M interaction (P<0.05) increased fluid passage rate. Ruminal ammonia-N concentration was similar among treatments. Barleey lowered (P<0.05) ruminal pH and increased (P<0.10) total volatile fatty acids. A RB X M X Trial interaction (P<0.05) was noted for molar proportions of acetate, propionate, and butyrate. Within trials, RB, M, and their combination affected (P<0.01 to P<0.10) acetate, propionate, and butyrate. We conclude that barley, monensin, and forage quality infiuence ruminal fermentation, passage rate, and intake traits of steers grazing summer range.
    Type
    text
    Article
    Language
    en
    ISSN
    0022-409X
    ae974a485f413a2113503eed53cd6c53
    10.2307/3898994
    Scopus Count
    Collections
    Journal of Range Management, Volume 43, Number 5 (September 1990)

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