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Ensiled Green Tea Waste as Partial Replacement for Soybean Meal and Alfalfa Hay in Lactating Cows

  • Kondo, Makoto (Graduate School of Bioagricultural Sciences, The Farm, Nagoya University) ;
  • Nakano, Masashi (Aichi Prefecutural Agricultural College) ;
  • Kaneko, Akemi (Aichi Prefecutural Agricultural College) ;
  • Agata, Hirobumi (Aichi Prefecutural Agricultural College) ;
  • Kita, Kazumi (Graduate School of Bioagricultural Sciences, The Farm, Nagoya University) ;
  • Yokota, Hiroomi (Graduate School of Bioagricultural Sciences, The Farm, Nagoya University)
  • Received : 2003.09.15
  • Accepted : 2004.04.12
  • Published : 2004.07.01

Abstract

The purpose of this study was to evaluate the effects of protein supplementation of green tea waste (GTW) on the performance of lactating cows. Another aim was to increase resource utilization and to eliminate any environmental negative impact from the tea waste. GTW from a beverage company was ensiled at a low pH (<4.0) and high acetic acid and lactic acid concentration, and it contained high crude protein (CP, 34.8%), total extractable tannins (TET, 9.2%) and condensed tannin (CT, 1.7%). Two experiments were conducted to investigate the palatability and performance in lactating cows fed GTW. In the palatability trial, three lactating cows were allocated to three dietary treatments in a 3$\times$3 Latin square design. The animals were offered a total mixed ration (TMR) including GTW at rates of 0, 2.5 and 5.0% on a dry matter (DM) basis. Total DM intake was not different among the treatments. In the performance trial, four lactating cows were used in a 2$\times$2 Latin square design with a 3 week sampling period. GTW was incorporated into TMR at a rate of 5.0% on a DM and 10.0% on a CP basis. Thus GTW replaced alfalfa hay and soybean meal at a level of 25.0% on a DM. DM and CP intake were not affected by the inclusion of GTW, whereas TET and CT intake were significantly increased (p<0.001). Milk production, milk composition and the efficiency of milk production were not altered by the GTW inclusion. Although ruminal pH and VFA, and blood urea nitrogen were not changed, ruminal $NH_{3}-N$ and plasma total cholesterol were relatively low in the GTW group, but not significantly different. The excretion of urinary purine derivatives and estimated MN supply were also not significantly affected by GTW treatment. It is therefore concluded that GTW can be used as a protein source without any detrimental effects on the performance of lactating cows.

Keywords

Green Tea Waste;Lactating Cows;Milk Yield;Protein;Tannin

Acknowledgement

Supported by : Dairy Cattle Research Department

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