Effect of wheat adaptation strategies on rumen parameters and dry matter intake of late lactation dairy cows

被引:0
作者
Russo, V. M. [1 ,2 ,3 ]
Leury, B. J. [2 ]
Kennedy, E. [3 ]
Hannah, M. C. [1 ]
Auldist, M. J. [1 ]
Wales, W. J. [1 ]
机构
[1] Agr Victoria, Dept Econ Dev Jobs Transport & Resources, 1301 Hazeldean Rd, Ellinbank, Vic 3821, Australia
[2] Univ Melbourne, Fac Vet & Agr Sci, Parkville, Vic 3010, Australia
[3] TEAGASC, Anim & Grassland Res & Innovat Ctr, Moorepk, Fermoy, Cork, Ireland
关键词
dietary change; ruminal pH; volatile fatty acids; SUBACUTE RUMINAL ACIDOSIS; HIGH CONCENTRATE DIET; BUFFERING CAPACITY; DIURNAL-VARIATION; GRAIN ADAPTATION; PH; PASTURE; FERMENTATION; DIGESTIBILITY; PREDICTION;
D O I
10.1071/AN17719
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
The effects of a major dietary change on ruminal fluid pH, volatile fatty acid (VFA), lactate and ammonia concentrations, dry matter intake (DMI) and milk yield were measured in 32 dairy cows in late lactation. All cows were initially fed 100% lucerne hay cubes and were then gradually introduced to a diet with wheat comprising 40% of total dry matter (DM) and lucerne hay cubes, the remainder. Wheat was gradually substituted for lucerne via one of four strategies, (1) in six small increments (each 6.7% of total DM) over 6 days; (2) in six small increments (each 6.7% of total DM) over 11 days; (3) in three large increments (each 13.3% of total DM) over 6 days; or (4) in three large increments (each 13.3% of total DM) over 11 days. The introduction of wheat in six small increments resulted in a lower daily minimum ruminal fluid pH (pH 5.95) when compared with using three large increments (pH 6.05). Despite this difference none of the treatments exhibited a ruminal fluid pH that would have compromised ruminal function, nor were there differences in DMI (19.7 kg DM/cow.day) or milk yield (16.0 kg/cow.day). Additionally, there were no differences between ruminal fluid VFA, lactate or ammonia concentrations. It is speculated that the properties of the lucerne cubes, including a high buffering capacity, helped the ruminal contents resist the pronounced declines in pH often seen with the fermentation of large amounts of wheat. Under the conditions of this experiment the wheat adaptation strategies used did not lead to any critical differences in rumen parameters. These results suggest that changes to rumen function are driven not only by the characteristics of the concentrate being introduced but also by those of the forage.
引用
收藏
页码:506 / 514
页数:9
相关论文
共 46 条
  • [1] [Anonymous], 2014, AUSTR DAIR IND FOC 2
  • [2] [Anonymous], 2009, COUNTRY PASTURE FORA
  • [3] [Anonymous], 2001, NATL ACAD SCI
  • [4] Replacing wheat with canola meal in a partial mixed ration increases the milk production of cows grazing at a restricted pasture allowance in spring
    Auldist, M. J.
    Marett, L. C.
    Greenwood, J. S.
    Wright, M. M.
    Hannah, M.
    Jacobs, J. L.
    Wales, W. J.
    [J]. ANIMAL PRODUCTION SCIENCE, 2014, 54 (07) : 869 - 878
  • [5] Production and digestion of supplemented dairy cows on pasture
    Bargo, F
    Muller, LD
    Kolver, ES
    Delahoy, JE
    [J]. JOURNAL OF DAIRY SCIENCE, 2003, 86 (01) : 1 - 42
  • [6] Effects of particle size of alfalfa-based dairy cow diets on chewing activity, ruminal fermentation, and milk production
    Beauchemin, KA
    Yang, WZ
    Rode, LM
    [J]. JOURNAL OF DAIRY SCIENCE, 2003, 86 (02) : 630 - 643
  • [7] Bevans DW, 2005, J ANIM SCI, V83, P1116
  • [8] The definition of acidosis in dairy herds predominantly fed on pasture and concentrates
    Bramley, E.
    Lean, I. J.
    Fulkerson, W. J.
    Stevenson, M. A.
    Rabiee, A. R.
    Costa, N. D.
    [J]. JOURNAL OF DAIRY SCIENCE, 2008, 91 (01) : 308 - 321
  • [9] Britton R.A., 1987, FEED INTAKE BEEF CAT, P125
  • [10] Brown M S, 2006, J Anim Sci, V84 Suppl, pE25