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Effect of Restriction of Dry Matter and Nutrient Intakes on Productivity of Holstein Lactating Cows Offered High Levels of Concentrate

건물 및 영양소 섭취량 제한이 농후사료 급여 비율이 높은 착유우의 생산성에 미치는 영향

  • Cho, Young-Seok (College of Animal Bioscience & Technology, Konkuk University) ;
  • Rim, Jong-Su (College of Animal Bioscience & Technology, Konkuk University) ;
  • Jang, Won-Seok (College of Animal Bioscience & Technology, Konkuk University) ;
  • Kim, Myeong-Hwa (College of Animal Bioscience & Technology, Konkuk University) ;
  • Lee, Sang-Rak (College of Animal Bioscience & Technology, Konkuk University)
  • 조영석 (건국대학교 동물생명과학대학) ;
  • 임종수 (건국대학교 동물생명과학대학) ;
  • 장원석 (건국대학교 동물생명과학대학) ;
  • 김명화 (건국대학교 동물생명과학대학) ;
  • 이상락 (건국대학교 동물생명과학대학)
  • Received : 2007.08.09
  • Accepted : 2009.02.13
  • Published : 2009.02.01

Abstract

Effects of dry matter intake restriction to the level of recommend by NRC (2001) on intake balance of dry matter and nutrients in Holstein lactating cow were evaluated. 24 lactating cows were divided into two groups and individually fed one of the TMR offered as ad libitum (control) and restricted amount (treatment) as recommended by NRC (2001). Milk yield including 4% FCM and FPCM were showed higher tendency in treatment group then those of control group. Also, intakes of dry matter, net energy and metabolizable protein were tended to be higher in treatment group then control group. Actual dry matter and net energy intakes in control group were higher (p<0.001) then those of recommended amount by NRC (2001), whereas no significant differences in treatment group. The estimated $NE_L$ allowable milk yield were lower (p<0.001) in both control and treatment group than those of recommended by NRC (2001). It was concluded that to allow ad libitum feeding of diet containing high levels of concentrate to the lactating cows might decrease the efficiency of feed nutrients and hence result in no positive effect on productivity of milk.

NRC (2001)의 권장량만큼 건물섭취 및 영양소 공급량을 제한하였을 경우의 착유우의 영양소 섭취균형 및 생산성을 제한하지 않았을 경우와 비교 조사하였다. Basal TMR을 무제한 급여한 대조구와 제한 급여한 시험구의 유생산량은 각각 27.5 kg/일/두, 28.1 kg/일/두로 시험구가 높은 경향을 나타내었고, 4% FCM과 FPCM 생산량은 각각 28.0 kg/일/두, 27.8kg/일/두로 대조구의 26.1 kg/일/두, 26.4 kg/일/두 보다 높은 경향을 나타내었으나 통계적 유의차는 나타나지 않았다. 대조구의 실제 건물섭취량은 23.8 kg/일/두로 시험구의 22.7 kg/일/두 보다 많이 섭취하였고, 대조구의 실제 건물섭취량은 NRC (2001)의 건물섭취 권장량보다 많이 섭취하는 것으로 나타났다(P<0.01). NRC (2001)로 추정한 대조구의 $NE_L$ 실제섭취량은 36.2 Mcal/일/두로 시험구의 34.9 Mcal/일/두 보다 높은 경향을 나타내었으며, NRC (2001)로 추정한 대조구와 시험구의 $NE_L$ 실제섭취량은 NRC (2001)의 $NE_L$ 섭취권장량 보다 모두 높게 나타났다(P<0.001). NRC (2001)로 추정한 대조구의 MP 실제섭취량은 2308 g/일/두로 시험구의 2224 g/일/두 보다 높은 경향을 나타내었으며, NRC (2001)로 추정한 대조구와 시험구의 MP 실제섭취량은 NRC(2001)의 MP 섭취권장량 보다 모두 높게 나타났으나 통계적 유의차는 나타나지 않았다. 이러한 본 실험의 결과에서 판단해 볼 때 농후사료 급여 비율이 높은 착유우에 있어서 건물섭취 및 영양소 섭취량을 무제한으로 허용하는 것은 오히려 사료의 이용효율을 감소시키는 것으로 예측되며, 따라서 유생산을 위한 영양소 이용 효율 역시 감소시키는 것으로 사료된다.

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