Parkia platycephala Pods Modulate Eimeria spp. Parasite Load and Enhance Productive Performance in Naturally Infected Lambs

Coccidiosis represents a major constraint to sheep productivity worldwide, with increasing concerns regarding anticoccidial resistance and growing interest in reducing dependency on conventional synthetic anticoccidials. This investigation evaluated the anticoccidial properties of faveira pods (<i>Parkia platycephala</i> pod-PpP) and their influence on productive performance in naturally infected lambs. Eighteen uncastrated Dorper × Santa Inês crossbred males (20.0 ± 2.5 kg, 5 months) were randomly allocated to three groups: G1 (0% PpP; <i>n</i> = 6), G2 (100% PpP replacing roughage, 30.0% of total diet; <i>n</i> = 6), and the control group (0% PpP plus 20 mg/kg toltrazuril; <i>n</i> = 5). Parasitological assessments, productive performance, and behavioral parameters were monitored over 45 days using oocyst counts, morphometric analysis, digestibility trials, and biometric measurements. Nine <i>Eimeria</i> species were identified, with <i>E. crandallis</i>, <i>E. parva</i>, and <i>E. bakuensis</i> representing 53.5% of total oocyst shedding. Group G2 demonstrated a numerical 8.5% reduction in parasite load compared to G1 (<i>p</i> = 0.42), while toltrazuril achieved 36.6% efficacy (<i>p</i> < 0.05). Species-specific effects were significant for <i>E. crandallis</i>, <i>E. parva</i>, and <i>E. ovinoidalis</i> (<i>p</i> < 0.01). A robust correlation emerged between parasite load and water consumption (r = 0.652, <i>p</i> = 0.0045), establishing a novel behavioral biomarker for coccidiosis monitoring. Environmental oocyst elimination decreased by 43.4% in the <i>P. platycephala</i> group. These findings demonstrate that PpPs possess moderate anticoccidial properties, offering a sustainable complementary strategy for integrated coccidiosis management while contributing to environmental sustainability.