TDN/CP 비율에 의한 영양소 공급이 젖소 육성우의 영양소 섭취량, 소화율, 반추위 발효 및 혈액특성에 미치는 영향
Effects of TDN/CP Ratio on Nutrient Intake, Digestibility, Ruminal Fermentation and Blood Characteristics of Replacement Dairy Heifers
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초록
본 연구는 국내 실정에 맞는 적정 TDN/CP 비율을 결정하기 위하여 4.6:1(T1)과 4.3:1(T2)의 비율로생후 13개월령 육성우에게 급여하여 영양소 섭취량, 소화율, 반추 위액 특성 및 혈액조성에 대하여 조사하였다. 건물 섭취량은 9.0kg/day로 동일하였으며, 조단백질 섭취량은 T1이 1.34kg/day, T2가1.45kg/day로 T2가 조금 높았으나 유의적인 차이는 없었다. 섬유소 섭취량과 소화율은 T1이 조금 높은경향을 보였으나 유의적인 차이는 없었다. 사료 섭취 후 4시간째 위액의 pH, ammonia-N, VFA 농도를 비교한 결과 처리구간 유의적인 차이를 나타내지 않았다. 전반적인 VFA 수치는 TDN/CP 비율에 따라 큰 영향이 없었으나 T1 처리구에서 iso-butyrate, iso-valerate 및 A/P ratio가 유의적으로 높은결과를 보였다(p<0.05). 혈액 특성에는 처리구간 유의적인 차이를 나타내지 않았다. TDN/CP 비율이4.3:1과 4.6:1 수준은 반추위 특성에 큰 영향을 미치지 않았지만, 소화율과 비교하였을 때 생후 13개월령 육성우 시기에는 섬유소 섭취량과 소화율이 증가되는 4.6:1 수준이 보다 적합할 것으로 판단된다.
Abstract
This study was conducted to investigate a proper management and nutrient supply for raisingreplacement heifers to improve lactating performance. In order to determine a proper TDN/CPratio that would be suitable for domestic use, 13-month-old replacement heifers were fed in theratios of 4.6:1(T1) and 4.3:1(T2), respectively, to examine the changes in nutritional intake,digestibility, characteristics of rumen fluid and blood compositions. While dry matter intake wassame at 9.0kg/day, CP intake did not show any significant difference, though T2(1.45kg/day)was slightly higher than T1(1.34kg/day). In fiber intake and digestibility, two results showed nosignificant difference, though T1 was slightly higher than T2. The pH, NH3-N and VFAdensities in rumen fluid examined at the fourth hour after feed intake did not show anysignificant difference either. Overall level of VFA was not influenced largely by the TDN/CPratio, but the iso-butyrate and iso-valerate levels and the A/P ratio were significantly high inT1(p<0.05). In blood characteristics, the treatments showed no significant difference. Inconclusion, the TDN/CP ratios of 4.3:1 and 4.6:1 did not significantly affect the characteristicsof the ruminant stomach, but in comparison with digestibility of 13-month-old heifers, the ratioof 4.6:1 was more appropriate for increased intake of fiber and higher digestibility.
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