한국초지조사료학회지 (Journal of The Korean Society of Grassland and Forage Science)

  • 제36권2호
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  • Pages.115-123
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  • 2016
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  • 2287-5824(pISSN)
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  • 2287-5832(eISSN)
한국초지조사료학회 (The Korean Society of Grassland and Forage Science)
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TDN/CP 비율이 젖소 12~14개월령 육성우 영양소 섭취량, 증체량 및 혈액성상에 미치는 영향

Effects of TDN/CP Ratio on Nutrient Intake, Body Weight Gain, Blood Characteristics of Dairy Heifers from 12 to 14 Months of Age

  • 김겸헌 (건국대학교 동물자원과학과) ;
  • 황원욱 (건국대학교 동물자원과학과) ;
  • 김현진 (서울대학교 농업생명과학연구원) ;
  • 김수기 (건국대학교 동물자원과학과)
  • Kim, Gyeom-Heon (Department of Animal Science and Technology, Konkuk University) ;
  • Hwang, Won-Uk (Department of Animal Science and Technology, Konkuk University) ;
  • Kim, Hyun-Jin (Research Institute for Agriculture and Life Sciences, Seoul National University) ;
  • Kim, Soo-Ki (Department of Animal Science and Technology, Konkuk University)
  • 투고 : 2016.04.29
  • 심사 : 2016.05.18
  • 발행 : 2016.06.30
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초록

본 연구는 수정 전 단계인 생후 12~14개월령의 육성우에게 급여하는 사료의 적정 영양소 수준에 대해 알아보고자 에너지와 단백질의 비율에 따른 영양소 이용성 및 증체량에 미치는 영향을 평가하였다. 건물 섭취량은 T1 (TDN/CP 비율, 5.0:1), T2 (TDN/CP 비율, 4.5:1) 그리고 T3 (TDN/CP 비율, 4.0:1)가 비슷한 수치를 보였다. 분 중 회분은 T1이 11.07%로 T3 (9.69%) 보다 유의적으로 높아졌으며, TDN/CP 비율이 높아질수록 분 내 회분 함량도 증가되었다. 초기 체중과 상관없이 증체량은 실험 개시 후 30일째 사료 내 CP 비율이 높아질수록 유의적으로 증가하였으나 60일째에는 T2가 유의적으로 가장 높은 증체를 보였다 (p<0.05). TDN 비율이 감소하거나 단백질 비율이 높아질수록 증체량은 유의적으로 증가되었다(p<0.05). 실험 종료 시의 혈중 GPT는 T1과 T3 (112.6, 88.3 u/l)가 T2 (50.9 u/l) 보다 유의적으로 높은 수치를 나타냈으며, phosphorus는 T1 (46.3 mg/dl)이 다른 처리구보다 유의적으로 높은 값을 보였다(p<0.05). HDL cholesterol은 T2 (145.2 md/dl)가 T1 (121.0 mg/dl)과 T3 (132.3 mg/dl) 보다 유의적으로 높았으며, triglyceride는 T3 (40.6 mg/dl)가 T1, T2 (20.7, 29.0 mg/dl) 보다 유의적으로 높은 수치를 보였다(p<0.05). BUN 농도를 비롯한 그 외의 혈액 분석항목들에서는 처리구별에 있어서 유의적 차이가 없었다. 결과적으로 섭취량과 증체율에서는 TDN/CP 비율이 4:1이 가장 좋았으나 체지방 축적이 과잉될 가능성이나 혈액대사 수치를 함께 고려한다면 이 시기에서는 4.5:1의 비율이 바람직한 것으로 판단된다.

In this study, the effect of energy and protein ratio on the nutrient availability and body weight gain was determined to find the proper nutrient level for the stage of replacement dairy heifers before fertilization at approximately 12~24 months old after birth. Dry matter intake showed that the TDN/CP rate of T1 (5.0:1), T2 (4.5:1) and T3 (4.0:1) resulted in similar values. Among feces, the ash content of T1 was 11.07%, which was significantly (p < 0.05) higher than that of T3 (9.69%). It was also significantly (p < 0.05) higher than that of T2 (10.32%). When the TDN/CP rate was increased, the ash content in the feces was also increased. Regardless of the initial weight, weight gain was increased significantly as the CP rate in the feed was increased on the $30^{th}$ day. On the $60^{th}$ day, T2 showed the highest rate of gain (p < 0.05). As the TDN rate was decreased or the protein rate was increased, weight gain was significantly (p < 0.05) increased. Regarding GPT level in the blood after finishing the test, T1 and T3 (112.6, 88.3 u/l) showed significantly (p < 0.05) higher value than T2 (50.9 u/l). For phosphorus level, T1 (46.3 mg/dl) showed significantly (p < 0.05) higher value than other treatments. For HDL cholesterol level, T2 (145.2 mg/dl) had significantly (p < 0.05) higher level than T1 (121.0 mg/dl) or T3 (132.3 mg/dl). For triglyceride levels, T3 (40.6 mg/dl) had significantly (p < 0.05) higher value than T1 (20.7 mg/dl) and T2 (29.0 mg/dl). For other blood parameters including BUN concentration, there were no significant (p > 0.05) difference among treatments. As a result, although feed intake and weight gain with TDN/CP rate of 4:1 showed best results, considering the excess body fat accumulation possibilities or blood metabolism, it seems 4.5:1 ratio is most appropriate.

키워드

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