University of Puerto Rico at Mayagüez Institutional Repository
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Publication Restricted Efectos del ajo morado gigante del mediterráneo y del orégano como antimicrobianos en la dieta de pollos parrilleros: Un estudio sobre su crecimiento(2025-12-18)Disease is an inevitable challenge for any living being. For decades, antibiotics and natural remedies have been used to treat it. In the poultry industry, the use of pharmaceuticals is not always regulated, resulting in improper dosages that foster microbial resistance in animals and humans, as seen with penicillin and ampicillin. This challenge has motivated the search for natural alternatives, including dietary supplements, to improve animal health and reduce antibiotic use. This study analyzed the antimicrobial effects of purple garlic and oregano in the diet of broiler chickens. Oregano (Origanum vulgare) enhances diet palatability, increasing consumption and weight in chickens. Its antimicrobial action helps maintain animal health. Purple garlic (Allium sativum L.) rich in organosulfur compounds such as allicin, it is noted for its antimicrobial properties. Benefits include reduced mortality, flock uniformity, improved cardiovascular function, and decreased issues like lameness. The supplement studied, Zooallium, combines these two natural ingredients from Spain. This approach for this study could revolutionize poultry production by promoting optimal weight gain and reducing reliance on antibiotics.Publication Restricted Resolving historical taxonomic ambiguities in 𝘗𝘰𝘴𝘵𝘩𝘰𝘥𝘪𝘱𝘭𝘰𝘴𝘵𝘰𝘮𝘶𝘮 (Trematoda: Diplostomidae)(2025-12-18)Metacercariae of Posthodiplostomum minimum (MacCallum, 1921) are among the most frequently reported parasites in freshwater fish. Early experimental work and recent molecular data show metacercariae of P. minimum occur exclusively in minnows (Leuciscidae), mainly in North America. As part of this reassessment, we generated and analyzed the mitochondrial genome and rDNA operon of the leuciscid-infecting lineage. In this study, the identity of this lineage was reassessed through analysis of DNA sequences from metacercariae and both naturally and experimentally obtained adults. Partial COI gene sequences confirmed conspecificity of these samples with the leuciscid-infecting lineage in North America recently identified as P. minimum. However, adult worms from both naturally infected Nycticorax nycticorax and domestic chicks experimentally infected with metacercariae from Pimephales promelas (Leuciscidae) were larger (918–1167 μm total length) than the re-examined type specimens of P. minimum (717–971 μm), and their prosoma-to-opisthoma ratios (1.88–2.41) also exceeded those of the specimens originally described by MacCallum (0.90–1.52). Following nomenclatural priority, we plan to designate the name Posthodiplostomum “vancleavei” (Agersborg, 1926) for the lineage of Posthodiplostomum infecting leuciscids in North America. Sequences indicate P. “vancleavei” has been introduced in Japan, and we discuss the likelihood of its establishment in Europe.Publication Restricted Nuestras raíces: The relationship between language and identity(2025-12-18)After working in a public elementary school in a Midwestern state in the U.S., the relationship between language and identity in the learning environment raised the central question of what purposes English (L2) and Spanish (L1) serve in the lives of newcomer students learning English. Using Funds of Knowledge (FoK) and Funds of Identity (FoI) as guiding frameworks, this qualitative case study examines interviews with three families and three educators, along with journal entries from student participants, to understand their perceptions of each language and its meaning for students, parents, and educators. Findings reveal that each language fulfills a distinct role: English is widely viewed as a tool for professional and social advancement, while Spanish remains the language of familial raíces and cultural grounding. The study’s implications highlight the need for educational and language policies that intentionally incorporate and reflect students’ native languages to ensure their meaningful presence in the classroom.Person Metadata only Person Metadata only
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