소맥 위주의 사료 내 Xylanase의 첨가가 육성돈의 사양성적, 영양소 소화율, 혈액성상, 분내 휘발성 지방산 및 암모니아성 질소 농도에 미치는 영향
Effects of Xylanase Supplementation on Growth Performance, Nutrient Digestibility, Blood Metabolites, Fecal Volatile Fatty Acids and Ammonia Nitrogen in Growing Pigs Fed Wheat-Based Diets
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본 연구는 소맥 위주 사료에 xylanase 효소제의 첨가가 육성돈의 사양성적, 영양소 소화율, 혈액성상, 분 중 휘발성 지방산 및 암모니아성 질소 농도에 미치는 영향을 알아보기 위하여 실시하였다. 총 192두(4처리, 8반복, 반복당 6두)의 육성돈(25.14±0.11 kg)을 공시하여 xylanase 첨가수준(0, 0.0125, 0.025, 0.0375%)으로 6주간 사양시험을 실시하였다. xylanase의 첨가수준이 증가함에 따라 전체 사양구간에서의 일당증체량(ADG), 일일사료섭취량(ADFI) 및 사료요구율(FCR)이 유의적으로 개선되는 효과를 나타냈다(p<005). 영양소 소화율에 있어서, xylanase 첨가수준이 증가함에 따라 phase Ⅰ에서는 건물 및 에너지, phase Ⅱ에서는 조단백질 소화율이 유의적으로 개선되었으며, 또한 육성돈의 혈중 GLU 농도는 사료 내 xylanase의 첨가수준이 증가함에 따라 유의적으로 증가하는 효과를 보였다(p<0.05). 반면에, 휘발성 지방산 및 암모니아성 질소 농도에서 xylanase의 유의적인 첨가효과는 나타나지 않았다(p>0.05). 결론적으로, 소맥 위주의 사료 내 xylanase의 첨가는 육성돈의 사양성적, 영양소 소화율 및 혈중 GLU 농도를 증가시키는데 긍정적인 효과를 보였으며, 육성돈 사료내 소맥을 주원료로 사용할 경우 xylanse의 적정 첨가수준은 0.0375%으로 사료된다.
Abstract
This study was conducted to investigate the effects of dietary xylanase supplements at various levels on growth performance, nutrient digestibility, blood metabolites, fecal volatile fatty acids, and ammonia nitrogen in growing pigs fed wheat-based diets. One hundred and ninety-two growing pigs (Landrace×Yorkshire×Duroc) with an average body weight of 25.14±0.11 kg were randomly assigned to four treatments on the basis of their initial body weight. Each treatment had eight replicates with six pigs. The experimental period was divided into phases Ⅰ and Ⅱ(each 21 days). The dietary treatments were: 1) Basal diet (T1, control), 2) T2 (control+0.0125% xylanase), 3) T3 (control+0.025% xylanase), 4) T4 (control+0.0375% xylanase). Improved average daily gain, average feed intake, and feed conversion ratio were observed with increasing xylanase supplemental levels throughout overall experimental periods (p<0.05). In the nutrient digestibility, the pigs fed diets supplemented with xylanase showed a linear increase in dry matter, energy in phases Ⅰ and Ⅱ, and crude protein in phase Ⅱ with the progressive supplemental levels of dietary xylanase (p<0.05). Blood glucose concentration showed a significantly increased effect in linear impact with increasing xylanase supplementation in diets. Dietary xylanase treatments did not affect fecal volatile fatty acids and ammonia nitrogen concentration. The results of the present study demonstrate the potential of dietary supplementation of xylanase in improving growth performance, nutrient digestibility, and blood glucose concentration in growing pigs fed wheat-based diets. In addition, this study suggests that the proper supplemental level of xylanase is 0.0375% in growing pigs fed wheat-based diets.
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