ISSUE FOCUS FEED & ADDITIVE MAGAZINE June 2025 33 DETECTION CHALLENGES AND CONTROL STRATEGIES One of the biggest challenges in combating feedsource pathogens is understanding their load and prevalence in feed. According to Alali (2012), uneven distribution and damage to bacteria in feed can lead to false negative results during microbial testing. Additionally, it has been noted that the complexity of modern livestock production systems further complicates data collection and surveillance efforts (Padungtod et al., 2008). Feed sampling has traditionally been conducted to ensure feed uniformity, monitor quality, and evaluate nutrient content and digestibility. However, sampling plays an equally crucial role in determining feed microbial risk. Microbial loads aren't distributed evenly throughout feed. Proper sampling is essential to accurately estimate fungal, bacterial, and viral contamination. Strategic sampling provides valuable information in three key areas: feed quality assessment (nutrient content, moisture, microbial loads), batch uniformity verification, and production process evaluation for pathogen control. Research by Gosling et al. (2022) exemplifies effective process evaluation, finding Salmonella in 20 of 22 surveyed commercial feed mills, with 75% showing less than 5% positive samples. This study demonstrated how strategic sampling can identify resident bacteria in mill environments, with concerning evidence that common feed mill Salmonella serovars matched those in broiler flocks. During the feed production process, microbial loads typically decrease after pelleting and conditioning. However, mills with legacy bacteria problems show distinctive recontamination patterns post-processing that strategic sampling can detect before downstream issues emerge. Truly effective pathogen reduction requires improved monitoring programs, sensitive detection methods and intervention strategies such as feed sanitation which provides long-term protection against recontamination. Average BWG d0-35 B A A A B BA BC DC A D Sanitized Feed Controls Sanitized Feed Controls 2.50 2.40 2.30 2.20 2.10 2.00 1.90 1.80 1.70 1.60 1.50 1.53 1.52 1.51 1.5 1.49 1.48 1.47 1.46 1.45 1.44 1.43 1.42 BWG in Kg T1 Starter T2 All Phase T3 Grower Finisher T4 Unchallenged Control T5 Challenged Control T1 Starter T2 All Phase T3 Grower Finisher T4 Unchallenged Control T5 Challenged Control P<0.0001 P<0.0001 Average FCR d0-35 Figure 2. Sanitized feed minimize body weight and FCR impact during necrotic enteritis challenge
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