면양에서 사료전용 벼와 식용 벼의 실제 TDN함량과 추정 TDN함량 간 비교
Comparison Between Observed and Estimated TDN Contents of Whole Crop Rice Silage from Forage and Food Source in Sheep
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참고문헌
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초록
본 연구의 목적은 GAFSA(2001a)의 TDN 추정방정식[TDN content=87.57-(0.737×ADF)]이 사료전용 및 식용 벼사일리지의 TDN함량 산출에 사용가능한지를 검토하는데 있다. 이를 위해서 사료전용 벼와 식용 벼사일리지를 면양에게 급여하여 산출한 실제 TDN함량과 TDN 추정방정식을 통해서 산출한 추정 TDN함량을 비교하였다. 공시동물은 코리데일 면양 9두(♀, 49.2±6.3kg)이며, 공시사료는 사료전용 벼인 녹양벼(9월 30일 수확)로 조제한 사일리지(NS)와 식용 벼인 삼광벼(10월 15일 수확)로 조제한 사일리지(SS)였다. 영양소소화율 실험은 면양 9두에게 NS와 SS 순으로 수행하였다. 사료급여는 영양소유지요구량 수준(NRC, 1985)에서 수행하였다. 실제 TDN함량과 추정 TDN함량 간의 차이는 비모수방법의 일표본 t-검정을 통해서 확인하였다. CP, NFE 및 CF소화율은 NS가 각각 43.6, 74.2 및 64.2%였고 SS가 각각 46.2, 58.1 및 44.9% 였다. 실제 TDN함량과 추정 TDN함량은 NS는 각각 63.5 및 61.5%로 유의적인 차이가 없었으나 SS는 각각 48.9 및 59.0%로 유의적인 차이가 나타났다(p<0.05). 이상에서 사료전용 벼 및 식용 벼의 TDN함량 산출에 GAFSA의 TDN추정방정식을 그대로 사용가능한지를 검토한 결과, 사료전용 벼에서는 사용가능하나 식용 벼에서는 새로운 TDN 추정방정식이 필요할 것으로 판단하였다.
Abstract
The objective of this study was to evaluate the accuracy of equation being used to estimate the total digestible nutrients (TDN) of whole crop rice silage (WCRS) in sheep. To compare the observed and estimated TDN contents [estimated TDN content=87.57-(0.737×ADF)], two varieties of WCRS from Nokyang (NS) and Samgwang (SS) as forage and food source, respectively, were used as a treatment. Nine female Corriedale sheep (average body weight: 49.2±6.3 kg) were used as the experimental animals. The ewes were fed according to their nutrient requirements at the maintenance level. To check the difference between the observed and estimated TDN contents, one sample non-parametric t-test was applied. The CP, NFE and CF contents of the NS were 43.6, 74.2 and 64.2%, respectively, and that of the SS were 46.2, 58.1 and 44.9%, respectively. The observed and estimated TDN contents of the NS were 63.5 and 61.5%, where there was no significant difference. The observed and estimated TDN contents of the SS were 48.9 and 59.0%, where there was significant difference (p<0.05) This research confirmed the validity of TDN estimation equation being used for estimation of TDN of WCRS as forage source, but further research is recommended on the equation for estimating TDN contents of WCRS as food source.
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