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The Use of Cassava Chips as an Energy Source for Lactating Dairy Cows Fed with Rice Straw

  • Sommart, K. (Department of Animal Science, Khon Kaen University) ;
  • Wanapat, M. (Department of Animal Science, Khon Kaen University) ;
  • Rowlinson, P. (Faculty of Agriculture & Biological Sciences, University of Newcastle upon Tyne) ;
  • Parker, D.S. (Faculty of Agriculture & Biological Sciences, University of Newcastle upon Tyne) ;
  • CIimee, P. (Dairy Promotion Organization of Thailand) ;
  • Panishying, S. (Dairy Promotion Organization of Thailand)
  • Received : 1999.05.20
  • Accepted : 1999.11.30
  • Published : 2000.08.01

Abstract

Thirty-six crossbred (70% Holstein Friesian) cows in mid-lactation were assigned to one of four treatments. The dietary treatments were concentrate based, containing 13.5, 27.0, 40.5 and 54.0% of cassava in concentrate replacing ground maize (16.0% CP). There were curvilinear responses to intake of organic matter, non-structural carbohydrate and metabolisable energy. Cassava and corn fed in a ratio of 50:50 maximised organic matter, metabolisable energy intake; milk yield, milk protein and lactose yield. Milk fat yield was not affected by levels of inclusion. Dietary treatment did not influence ruminal pH, ammonia and volatile fatty acid concentrations or plasma glucose. The low market price for cassava resulted in a lower concentrate feed cost. The optimal level of cassava in a dairy cow diet is suggested as being between 20.0 and 30.0% of cassava in dry matter intake when fed with rice straw.

Keywords

Cassava;Milk Production;Cows;Feed

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