인문학
사회과학
자연과학
공학
의약학
농수해양학
예술체육학
복합학
DBpia AI
AI 에이전트
AI 아이디어
AI 리더
AI 뷰어
Citeasy
크롬 서지관리 다운로드
지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록·키워드
Shiga toxin-producing Escherichia coli (STEC) remains a significant public health concern in beef production, regardless of feeding systems. While consumer interest in grass-fed beef has increased due to climate change concerns and social media trends, the safety implications of different feeding practices on STEC prevalence and populations are not fully understood. Therefore, the objectives of this study were to evaluate the effects of grain-fed and grass-fed feeding systems on STEC prevalence, population, and its interaction with the fecal microbiota in beef cattle. Post-weaning steers were assigned to four feeding systems: Conventional grain-fed (CON, n = 21), 20-month grass-fed (20GF, n = 18), 25-month grass-fed (25GF, n = 16), and 45-day grain-fed after 20-month grass-fed (GR45, n = 13). Rectal fecal samples were collected at 14 months of age as baseline and pre-harvest for STEC enumeration, prevalence, and microbial analysis. The microbial DNA was extracted and sequenced for 16 S rRNA gene for microbiota analysis. Data demonstrated that cattle in grain-fed feeding system had a higher (P < 0.05) fecal STEC population than the grass-fed feeding system. However, the fecal prevalence of STEC was lower (P < 0.05) only in the GR45 compared to the grass-fed groups, while the CON group did not differ (P > 0.05) in STEC prevalence. In terms of STEC population, GR45 was more similar to the grain-fed group. Alpha diversity was greater (P < 0.05) in CON, followed by 25GF, with GR45 being the only system where alpha diversity decreased (P < 0.05) from baseline to harvest. Beta diversity showed a notable difference (R = 0.913, P = 0.001) in fecal microbial composition between CON and GR45. Firmicutes and Bacteroidetes were the dominant phyla across all feeding systems. At harvest, GR45 had the highest (P < 0.0001) Firmicutes abundance, followed by 20GF, while the lowest levels were observed in 25GF and CON. Among bacterial families, Peptostreptococcaceae was more abundant in grass-fed groups, whereas Ruminococcaceae was more prevalent in the grain-fed CON group. Microbiota associated with lower STEC prevalence, such as Bacteroidetes, were more abundant in STEC-negative samples. These findings suggest that feeding systems influence both STEC levels and gut microbial diversity, offering insights into managing microbiota to enhance food safety in beef production. Nonetheless, the results should be interpreted in the context of the study’s limited sample size and the inherent variability associated with intermittent STEC shedding and microbiota composition.
인공지능 문자 인식 모델을 통해 추출된 텍스트로, 일부 오타나 오류가 포함될 수 있으나 지속적으로 개선 중입니다.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
오류를 발견하셨다면 해당 부분을 드래그한 후 ' 를 통해 신고해주세요.
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