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

TDN/CP 비율이 젖소 12~14개월령 육성우 영양소 섭취량, 증체량 및 혈액성상에 미치는 영향

  • 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)
  • 김겸헌 (건국대학교 동물자원과학과) ;
  • 황원욱 (건국대학교 동물자원과학과) ;
  • 김현진 (서울대학교 농업생명과학연구원) ;
  • 김수기 (건국대학교 동물자원과학과)
  • Received : 2016.04.29
  • Accepted : 2016.05.18
  • Published : 2016.06.30

Abstract

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.

Acknowledgement

Supported by : 농림수산식품기술기획평가원

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