Fachbereich Veterinärmedizin



    Effect of short-term feed restriction on ruminal function (2012)

    Zhang, S. (WE 2)
    Barreda, D.
    Aschenbach, Jörg R. (WE 2)
    Penner, G. B.
    JAM 2012 Animal Meeting
    Arizona, 19.07.2012
    Animal science; 90(Suppl. 3) — S. 736–737
    ISSN: 1357-7298
    Institut für Veterinär-Physiologie

    Oertzenweg 19 b
    14163 Berlin
    Tel.+49 30 838 62600 Fax.+49 30 838-62610

    Abstract / Zusammenfassung

    This study was conducted to evaluate whether the severity of short-
    term feed restriction (FR) affects ruminal function. Eighteen ruminally cannulated heifers were blocked by BW and randomly assigned to 1 of
    3 treatments differing in the severity of FR; 75, 50, or 25% of ad libitum
    intake relative to the baseline period. Each heifer was exposed to 14 d
    for adaptation, 5 d for baseline, 5 d of FR, and 3 wk of recovery (R1, R2,
    and R3). Heifers were fed the same diet (60% forage: 40% concentrate)
    throughout the study and were fed ad libitum during the baseline and
    recovery periods. Water was available at all times. Ruminal pH and DMI
    were measured daily and absorptive function was evaluated using the
    temporarily isolated and washed reticulo-rumen technique. There was
    a treatment × period interaction for DMI (
    P< 0.01) with lowest values
    for 25% (2.65 kg/d), intermediate for 50% (5.3 kg/d), and greatest for
    75% (8.2 kg/d) during FR, but differences were not observed among
    treatments within other periods. Treatment × period interactions were
    also detected for nadir (P< 0.01), mean (
    P< 0.01) and maximum (P< 0.01) ruminal pH. Generally, heifers fed 25% increased pH to a greater
    extent during FR but decreased to a greater extent during R1 when
    compared with those fed 50 and 75%. The area (
    P < 0.01) that pH <5.5
    was smaller during FR (0.4 pH × min/d) and greater during R1 (80.4
    pH × min/d) than baseline (24.2 pH × min/d), but R2 and R3 (44.9 and
    36.2 pH × min/d, respectively) did not differ from baseline. The abso
    -lute rate (mmol/h) for acetate absorption (
    P < 0.01) was greater during
    baseline (332.1 mmol/h) than FR (253.5 mmol/h) with the rate being
    faster in R3 relative to FR; however, the rates did not differ between R1
    (320.0 mmol/h) and R3 (343.8 mmol/h). Absolute rates for propionate
    and butyrate absorption (period effect,
    P ≤ 0.04) also followed a similar
    pattern as for acetate, except that baseline and FR values did not differ.
    The results of this study indicate that 5-d FR increases the risk for
    ruminal acidosis, regardless of the severity of FR imposed, which may
    be linked to negative carry-over effects of FR on acetate absorption.