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Effects of Feeding Heat Treated Protein and Mineral Complex on In Vitro Fermentation Characteristics, Milk Production and Composition of Holstein Dairy Cows

열처리 단백질-광물질 복합제제 첨가가 In Vitro 발효성상과 착유우의 유량 및 유성분에 미치는 영향

  • Choi, N.J. (School of Agricultural Biotechnology, Seoul National University) ;
  • Bae, G.S. (Department of Animal Science and Technology, Chung-Ang University) ;
  • Nam, K.P. (Department of Animal Science and Technology, Chung-Ang University) ;
  • Chang, M.B. (Department of Animal Science and Technology, Chung-Ang University) ;
  • Um, J.S. (EUNJIN International Co., Ltd.) ;
  • Ko, J.Y. (Nonghyup Feed INC.) ;
  • Ha, J.K. (School of Agricultural Biotechnology, Seoul National University)
  • Published : 2002.10.31

Abstract

This study, consisting of two experiments, was conducted to determine the effects of feeding heat treated protein and mineral complex (HPM) on milk production and composition, and ruminal fermentation of Holstein dairy cows. In in vitro experiment, HPM levels were 0, 0.2, 1 and 2%, and Timothy hay, which was substrate, was milled as 1 mm size, and the effects of HPM on pH, ammonia and VFA were analyzed after incubation times of 0, 6, 12, 24 and 48 h, respectively. The pH and ammonia production were not significantly different between treatments during the incubation. In addition, generally, total VFA and individual VFA were not affected by HPM on 0, 6 and 24 h. While, total VFA and individual VFA were increased in 0.2% and 1% of HPM supplemented treatments, but decreased in 2% of HPM treatment compared with control on 12 h. On 48 h, total VFA and individual VFA were increased in HPM treatments compared to control (P<0.05). However, A/P ratio was not affected by HPM supplementation. Gas production was higher in HPM treatment compared to control on 24 h (P<0.05) and 48 h (P<0.05). In lactating experiment, fourteen lactating Holstein cows were used for 4 months in a cross over experimental design. There were two treatments; no added HPM as a control and 0.2% of HPM added as a test treatment. Daily milk yield (P<0.001), 4% FCM (P<0.001), milk protein (P<0.05) and SNF (solid not fat; P<0.05) were increased in HPM treatment compared to control. While, milk fat, MUN (milk urea nitrogen) and SCC (somatic cell count) were not significantly different between treatments.

Keywords

Milk yield;Milk composition;Heat treated protein and mineral complex(HPM);Ruminal fermentation

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