Effects of different Bacillus licheniformis and Bacillus subtilis ratios on nutrient digestibility, fecal microflora, and gas emissions of growing pigs

Autor: Yong Ju Kim, Sung Bo Cho, Min Ho Song, Sung Il Lee, Seok Man Hong, Won Yun, Ji Hwan Lee, Han Jin Oh, Se Yeon Chang, Jae Woo An, Young Bin Go, Dong Cheol Song, Hyun Ah Cho, Hyeun Bum Kim, Jin Ho Cho
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Journal of Animal Science and Technology, Vol 64, Iss 2, Pp 291-301 (2022)
Druh dokumentu: article
ISSN: 2672-0191
2055-0391
DOI: 10.5187/jast.2022.e12
Popis: The objective of this study was to evaluate the effects of different mixing ratios of Bacillus licheniformis and Bacillus subtilis in diets on nutrient digestibility, fecal microflora, and odor gas emissions of growing pigs. A total of four crossbred ([Landrace × Yorkshire] × Duroc) barrows with average body weight (BW) of 41.2 ± 0.7 kg were randomly allotted four diets over four periods in a 4 × 4 Latin square design. Treatments were as follows: Control (CON, basal diet), CON + 0.2% probiotic complex (L4S6, B. licheniformis and B. subtilis at a 4:6 ratio), CON + 0.2% probiotic complex (L5S5, B. licheniformis and B. subtilis at a 5:5 ratio), CON + 0.2% probiotic complex (L6S4, B. licheniformis and B. subtilis at a 6:4 ratio). Dietary probiotic supplementation showed higher crude protein (CP) digestibility values and lower Escherichia coli counts in fecal samples than the CON group (p < 0.05). There was no significant difference in NH3 or H2S emission until day 3. The positive effect of H2S and NH3 emissions was detected earlier with the L4S6 and L5S5 compared to the L6S4, which had a lower ratio of B. subtilis. Both the L4S6 and L5S5 probiotic complexes significantly decreased the fecal H2S and NH3 emission in days 4 and 6 (p < 0.05). On day 7, all probiotic complexes decreased (p < 0.05) H2S and NH3 emissions than the CON group. Our results agreed that the dietary supplementation of Bacillus licheniformis and Bacillus subtilis complexes in growing pigs can significantly improve CP digestibility and reduce fecal E. coli counts, NH3 and H2S emissions. Notably, the higher mixing ratio of Bacillus subtilis in probiotic supplementation is more effective in reducing the odor of manure.
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