육성돈사료에 Lactobacillus brevis의 첨가가 성산성, 건물과 질소 소화율, 혈구수 및 분 내 악취 발생 물질에 미치는 영향
Effects of Dietary Lactobacillus brevis Supplementation on Growth Performance, Dry Matter and Nitrogen Digestibilities, Blood Cell Counts and Fecal Odor Emission Compounds in Growing Pigs
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본 시험은 육성돈 사료내 생균제 (Lactobacillus brevis, 3.4×108 CFU/g)의 첨가, 급여가 생산성, 건물과 질소 소화율, 혈구수 및 분 내 악취 발생 물질에 미치는 영향을 조사하기 위하여 실시하였다. 개시시 체중 24.60±1.28kg의 3원교잡종 [(Landrace×Yorkshire)×Duroc] 육성돈 96두를 공시하여 42일간 사양시험을 실시하였다. 시험설계는 옥수수－대두박 위주의 사료내 생균제를 첨가하지 않은 CON (basal diet), 생균제를 0.2% 첨가한 LB1 과 생균제를 0.4% 첨가한 LB2의 3개 처리구로 하여 처리당 8반복, 반복당 4두씩 완전임의 배치하였다. 전체 시험기간동안의 일당증체량, 일당사료섭취량 및 사료효율에서 있어서는 처리구간 유의한 차이를 나타내지 않았다(P<0.05). 질소 소화율에서 LB1 과 LB2 처리구가 대조구와 비교하여 유의적으로 증가하였다(linear effect, P<0.05). 그러나 건물 소화율에 있어서는 처리구간에 유의적인 차이를 보이지 않았다(P>0.05). 혈액내 WBC, RBC 및 lymphocyte 함량에 있어서는 처리구간에 유의적인 차이를 보이지 않았다(P>0.05). 분내 암모니아태 질소 및 황화수소의 함량은 LB2 처리구가 대조구와 비교하여 유의적으로 감소하였다(linear effect, P<0.05). 분내 acetic acid 와 propionic acid 함량에서는 BMS2 처리구가 대조구와 비교하여 유의적으로 감소하였다(linear effect, P<0.05), butyric acid 에서는 각 처리구간 유의적인 차이는 없었다(P>0.05). 결론적으로, 육성돈 사료내 0.4%의 Lactobacillus brevis (3.4×108 CFU/g) 첨가는 질소 소화율 향상 및 분내 악취 발생 물질 함량을 감소 시키는 것으로 사료된다.
Abstract
This study was conducted to investigate the effects of dietary Lactobacillus brevis (3.4×108 CFU/g) supplementation on growth performance, DM and N digestibilities, blood cell counts and fecal odor emission compounds in growing pigs. Ninety six crossbred [(Landrace×Yorkshire)×Duroc] pigs with an initial BW of 24.60±1.28kg were used for 42-d feeding trial according to a completely randomized design. Three corn- soybean meal based dietary treatments included: 1) CON (basal diet); 2) LB1 (basal diet + Lactobacillus brevis 0.2%) and 3) LB2 (basal diet+Lactobacillus brevis 0.4%). There were three dietary treatments with eight replicate pens per treatment and four pigs per pen. Through the entire experimental period, ADG, ADFI and gain/feed had no significant differences among treatments(P>0.05). Nitrogen digestibility was increased in LB1 and LB2 treatments compared to CON treatment (linear effect, P<0.05), however, DM digestibility had no significant difference among all the treatments (P>0.05). The WBC, RBC and lymphocyte concentrations in whole blood were not affected by treatments (P>0.05). Fecal NH3N and H2S concentrations were significant decreased in LB2 treatment compared to CON treatment (linear effect, P<0.05). Fecal VFA (acetic acid and propionic acid) concentration was also reduced in LB2 treatment compared to CON treatment (linear effect, P<0.05). In conclusion, Lactobacillus brevis (3.4×108 CFU/g) supplementation at the level of 0.4% can improve nitrogen digestibility and decrease the concentrations of fecal odor emission compounds in growing pigs.
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