Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions
- Autores
- Gaggiotti, Monica Del Carmen; Muñoz, Fernando Felipe; Sánchez-Martín, María Jesús; Boada, Roberto; Simonelli, Laura; Valiente, Manuel; Guevara, María Gabriela; Llugany, Mercè; Marini, Carlo; Smulovitz, Alejandro; Miotti, Camila; Roskopf Perez, Pablo Matías; Di Rienzo, Julio Alejandro; Marini, Federico; Pandey, Pramod K.; Castillo, Alejandro
- Año de publicación
- 2026
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Objective: This study evaluated the effect of alfalfa (Medicago sativa) selenium (Se) biofortified via foliar applications on the concentration and speciation of Se in milk from dairy cows under grazing conditions. Materials and Methods: Two treatments, control and FertSe (alfalfa biofortified with 90 g of Na selenite/ha), were tested in a replicated crossover design with 2 periods, including a 9-d adaptation period and 5-d evaluation period, resulting in 4 experimental grazing groups, 5 cows each, 20 lactating Holstein dairy cows in total. Results and Discussion: The Se concentration in alfalfa pasture of the FertSe treatment increased 21 times when compared with the control pasture, from 0.15 to 3.17 mg/kg of DM. The increment was also observed in the total diet because Se content (from 0.14 to 2.65 mg/kg of DM) and Se intake (from 2.9 to 54.9 mg/cow per day) both increased 19-fold. Our results indicate that of the total selenium (Se) intake in the FertSe treatment, 1.26 mg/d was transferred to milk, corresponding to a trans-fer efficiency of 2.29%. This efficiency was approximately 70% lower than that observed in the control treatment, where milk Se output was 0.23 mg/cow per day. Milk Se concentration increased 4-fold, from 15 to 65 μg/L of milk in control and FertSe, respectively. Organic Se was the predominant chemical form in milk, representing approximately 80% of total Se, compared with approximately 55% in alfalfa. Implications and Applications: Further research is needed to identify additional organic Se species in alfalfa and milk. Long-term studies are needed to assess the effects of pasture Se fertilization on milk yield and overall production efficiency. Several factors should be considered when estimating the appropriate Se fertilization rate and the resulting Se concentration in alfalfa: (1) the Se content of dietary ingredients; (2) potential antagonistic interactions with other minerals, (3) animal Se requirements; and (4) regulations established by the US Food and Drug Ad-ministration or by the competent regulatory authorities in other countries where selenium Se is regulated.
EEA Rafaela
Fil: Gaggiotti, Monica Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina
Fil: Gaggiotti, Monica Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina
Fil: Gaggiotti, Monica Del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina
Fil: Muñoz, Fernando Felipe. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Biológicas (IIB); Argentina
Fil: Muñoz, Fernando Felipe. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas (IIB); Argentina
Fil: Muñoz, Fernando Felipe. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias. Cátedra de Fisiología Vegetal; Argentina
Fil: Sánchez-Martín, María Jesús. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; España
Fil: Boada, Roberto. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; España
Fil: Simonelli, Laura. ALBA Synchrotron; España
Fil: Valiente, Manuel. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; España
Fil: Guevara, María Gabriela. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Biológicas (IIB); Argentina
Fil: Guevara, María Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas (IIB); Argentina
Fil: Llugany, Mercè. Universitat Autonòma de Barcelona. Faculty of Biosciences. Plant Physiology Group (BABVE); España
Fil: Marini, Carlo. ALBA Synchrotron; España
Fil: Smulovitz Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina
Fil: Smulovitz, Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina
Fil: Smulovitz, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina
Fil: Miotti, Camila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina
Fil: Miotti, Camila. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina
Fil: Miotti, Camila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina
Fil: Roskopf Perez, Pablo Matías. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina
Fil: Roskopf, Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IdICaL); Argentina.
Fil: Roskopf, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IdICaL); Argentina.
Fil: Di Rienzo, Julio Alejandro. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina
Fil: Marini, Federico. Sapienza University of Rome. Department of Chemistry; Italia
Fil: Pandey, Pramod K. University of California at Davis. School of Veterinary Medicine; Estados Unidos
Fil: Castillo, Alejandro. University of California. Cooperative Extension; Estados Unidos - Fuente
- Applied Animal Science 42 (5) : 459-466. (October 2026)
- Materia
-
Medicago sativa
Forage
Grazing
Dairy Cows
Selenium
Biofortification
Forrajes
Pastoreo
Vacas Lecheras
Selenio
Bioenriquecimiento
Alfalfa
Lucerne - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
.jpg)
- Institución
- Instituto Nacional de Tecnología Agropecuaria
- OAI Identificador
- oai:localhost:20.500.12123/27815
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Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditionsGaggiotti, Monica Del CarmenMuñoz, Fernando FelipeSánchez-Martín, María JesúsBoada, RobertoSimonelli, LauraValiente, ManuelGuevara, María GabrielaLlugany, MercèMarini, CarloSmulovitz, AlejandroMiotti, CamilaRoskopf Perez, Pablo MatíasDi Rienzo, Julio AlejandroMarini, FedericoPandey, Pramod K.Castillo, AlejandroMedicago sativaForageGrazingDairy CowsSeleniumBiofortificationForrajesPastoreoVacas LecherasSelenioBioenriquecimientoAlfalfaLucerneObjective: This study evaluated the effect of alfalfa (Medicago sativa) selenium (Se) biofortified via foliar applications on the concentration and speciation of Se in milk from dairy cows under grazing conditions. Materials and Methods: Two treatments, control and FertSe (alfalfa biofortified with 90 g of Na selenite/ha), were tested in a replicated crossover design with 2 periods, including a 9-d adaptation period and 5-d evaluation period, resulting in 4 experimental grazing groups, 5 cows each, 20 lactating Holstein dairy cows in total. Results and Discussion: The Se concentration in alfalfa pasture of the FertSe treatment increased 21 times when compared with the control pasture, from 0.15 to 3.17 mg/kg of DM. The increment was also observed in the total diet because Se content (from 0.14 to 2.65 mg/kg of DM) and Se intake (from 2.9 to 54.9 mg/cow per day) both increased 19-fold. Our results indicate that of the total selenium (Se) intake in the FertSe treatment, 1.26 mg/d was transferred to milk, corresponding to a trans-fer efficiency of 2.29%. This efficiency was approximately 70% lower than that observed in the control treatment, where milk Se output was 0.23 mg/cow per day. Milk Se concentration increased 4-fold, from 15 to 65 μg/L of milk in control and FertSe, respectively. Organic Se was the predominant chemical form in milk, representing approximately 80% of total Se, compared with approximately 55% in alfalfa. Implications and Applications: Further research is needed to identify additional organic Se species in alfalfa and milk. Long-term studies are needed to assess the effects of pasture Se fertilization on milk yield and overall production efficiency. Several factors should be considered when estimating the appropriate Se fertilization rate and the resulting Se concentration in alfalfa: (1) the Se content of dietary ingredients; (2) potential antagonistic interactions with other minerals, (3) animal Se requirements; and (4) regulations established by the US Food and Drug Ad-ministration or by the competent regulatory authorities in other countries where selenium Se is regulated.EEA RafaelaFil: Gaggiotti, Monica Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Gaggiotti, Monica Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); ArgentinaFil: Gaggiotti, Monica Del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); ArgentinaFil: Muñoz, Fernando Felipe. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Biológicas (IIB); ArgentinaFil: Muñoz, Fernando Felipe. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas (IIB); ArgentinaFil: Muñoz, Fernando Felipe. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias. Cátedra de Fisiología Vegetal; ArgentinaFil: Sánchez-Martín, María Jesús. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; EspañaFil: Boada, Roberto. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; EspañaFil: Simonelli, Laura. ALBA Synchrotron; EspañaFil: Valiente, Manuel. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; EspañaFil: Guevara, María Gabriela. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Biológicas (IIB); ArgentinaFil: Guevara, María Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas (IIB); ArgentinaFil: Llugany, Mercè. Universitat Autonòma de Barcelona. Faculty of Biosciences. Plant Physiology Group (BABVE); EspañaFil: Marini, Carlo. ALBA Synchrotron; EspañaFil: Smulovitz Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Smulovitz, Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); ArgentinaFil: Smulovitz, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); ArgentinaFil: Miotti, Camila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); ArgentinaFil: Miotti, Camila. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); ArgentinaFil: Miotti, Camila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Roskopf Perez, Pablo Matías. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; ArgentinaFil: Roskopf, Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IdICaL); Argentina.Fil: Roskopf, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IdICaL); Argentina.Fil: Di Rienzo, Julio Alejandro. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; ArgentinaFil: Marini, Federico. Sapienza University of Rome. Department of Chemistry; ItaliaFil: Pandey, Pramod K. University of California at Davis. School of Veterinary Medicine; Estados UnidosFil: Castillo, Alejandro. University of California. Cooperative Extension; Estados UnidosElsevier2026-09-16T12:48:36Z2026-09-16T12:48:36Z2026-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://hdl.handle.net/20.500.12123/27815https://www.sciencedirect.com/science/article/pii/S25902865260006372590-2865https://doi.org/10.15232/aas.2025-02787Applied Animal Science 42 (5) : 459-466. (October 2026)reponame:INTA Digital (INTA)instname:Instituto Nacional de Tecnología Agropecuariaenginfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)2026-09-24T11:43:50Zoai:localhost:20.500.12123/27815instacron:INTAInstitucionalhttp://repositorio.inta.gob.ar/Organismo científico-tecnológicoNo correspondehttp://repositorio.inta.gob.ar/oai/requesttripaldi.nicolas@inta.gob.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:l2026-09-24 11:43:51.286INTA Digital (INTA) - Instituto Nacional de Tecnología Agropecuariafalse |
| dc.title.none.fl_str_mv |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| title |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| spellingShingle |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions Gaggiotti, Monica Del Carmen Medicago sativa Forage Grazing Dairy Cows Selenium Biofortification Forrajes Pastoreo Vacas Lecheras Selenio Bioenriquecimiento Alfalfa Lucerne |
| title_short |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| title_full |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| title_fullStr |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| title_full_unstemmed |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| title_sort |
Evaluation of alfalfa pasture biofortified via foliar selenium applications and lactating dairy cows under grazing conditions |
| dc.creator.none.fl_str_mv |
Gaggiotti, Monica Del Carmen Muñoz, Fernando Felipe Sánchez-Martín, María Jesús Boada, Roberto Simonelli, Laura Valiente, Manuel Guevara, María Gabriela Llugany, Mercè Marini, Carlo Smulovitz, Alejandro Miotti, Camila Roskopf Perez, Pablo Matías Di Rienzo, Julio Alejandro Marini, Federico Pandey, Pramod K. Castillo, Alejandro |
| author |
Gaggiotti, Monica Del Carmen |
| author_facet |
Gaggiotti, Monica Del Carmen Muñoz, Fernando Felipe Sánchez-Martín, María Jesús Boada, Roberto Simonelli, Laura Valiente, Manuel Guevara, María Gabriela Llugany, Mercè Marini, Carlo Smulovitz, Alejandro Miotti, Camila Roskopf Perez, Pablo Matías Di Rienzo, Julio Alejandro Marini, Federico Pandey, Pramod K. Castillo, Alejandro |
| author_role |
author |
| author2 |
Muñoz, Fernando Felipe Sánchez-Martín, María Jesús Boada, Roberto Simonelli, Laura Valiente, Manuel Guevara, María Gabriela Llugany, Mercè Marini, Carlo Smulovitz, Alejandro Miotti, Camila Roskopf Perez, Pablo Matías Di Rienzo, Julio Alejandro Marini, Federico Pandey, Pramod K. Castillo, Alejandro |
| author2_role |
author author author author author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Medicago sativa Forage Grazing Dairy Cows Selenium Biofortification Forrajes Pastoreo Vacas Lecheras Selenio Bioenriquecimiento Alfalfa Lucerne |
| topic |
Medicago sativa Forage Grazing Dairy Cows Selenium Biofortification Forrajes Pastoreo Vacas Lecheras Selenio Bioenriquecimiento Alfalfa Lucerne |
| dc.description.none.fl_txt_mv |
Objective: This study evaluated the effect of alfalfa (Medicago sativa) selenium (Se) biofortified via foliar applications on the concentration and speciation of Se in milk from dairy cows under grazing conditions. Materials and Methods: Two treatments, control and FertSe (alfalfa biofortified with 90 g of Na selenite/ha), were tested in a replicated crossover design with 2 periods, including a 9-d adaptation period and 5-d evaluation period, resulting in 4 experimental grazing groups, 5 cows each, 20 lactating Holstein dairy cows in total. Results and Discussion: The Se concentration in alfalfa pasture of the FertSe treatment increased 21 times when compared with the control pasture, from 0.15 to 3.17 mg/kg of DM. The increment was also observed in the total diet because Se content (from 0.14 to 2.65 mg/kg of DM) and Se intake (from 2.9 to 54.9 mg/cow per day) both increased 19-fold. Our results indicate that of the total selenium (Se) intake in the FertSe treatment, 1.26 mg/d was transferred to milk, corresponding to a trans-fer efficiency of 2.29%. This efficiency was approximately 70% lower than that observed in the control treatment, where milk Se output was 0.23 mg/cow per day. Milk Se concentration increased 4-fold, from 15 to 65 μg/L of milk in control and FertSe, respectively. Organic Se was the predominant chemical form in milk, representing approximately 80% of total Se, compared with approximately 55% in alfalfa. Implications and Applications: Further research is needed to identify additional organic Se species in alfalfa and milk. Long-term studies are needed to assess the effects of pasture Se fertilization on milk yield and overall production efficiency. Several factors should be considered when estimating the appropriate Se fertilization rate and the resulting Se concentration in alfalfa: (1) the Se content of dietary ingredients; (2) potential antagonistic interactions with other minerals, (3) animal Se requirements; and (4) regulations established by the US Food and Drug Ad-ministration or by the competent regulatory authorities in other countries where selenium Se is regulated. EEA Rafaela Fil: Gaggiotti, Monica Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina Fil: Gaggiotti, Monica Del Carmen. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina Fil: Gaggiotti, Monica Del Carmen. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina Fil: Muñoz, Fernando Felipe. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Biológicas (IIB); Argentina Fil: Muñoz, Fernando Felipe. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas (IIB); Argentina Fil: Muñoz, Fernando Felipe. Universidad Nacional del Litoral. Facultad de Ciencias Agrarias. Cátedra de Fisiología Vegetal; Argentina Fil: Sánchez-Martín, María Jesús. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; España Fil: Boada, Roberto. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; España Fil: Simonelli, Laura. ALBA Synchrotron; España Fil: Valiente, Manuel. Universitat Autònoma de Barcelona. Faculty of Science. Department of Chemistry. GTS Research Group; España Fil: Guevara, María Gabriela. Universidad Nacional de Mar del Plata. Instituto de Investigaciones Biológicas (IIB); Argentina Fil: Guevara, María Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigaciones Biológicas (IIB); Argentina Fil: Llugany, Mercè. Universitat Autonòma de Barcelona. Faculty of Biosciences. Plant Physiology Group (BABVE); España Fil: Marini, Carlo. ALBA Synchrotron; España Fil: Smulovitz Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina Fil: Smulovitz, Alejandro. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina Fil: Smulovitz, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina Fil: Miotti, Camila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina Fil: Miotti, Camila. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IDICAL); Argentina Fil: Miotti, Camila. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina Fil: Roskopf Perez, Pablo Matías. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela; Argentina Fil: Roskopf, Pablo. Instituto Nacional de Tecnología Agropecuaria (INTA). Estación Experimental Agropecuaria Rafaela. Instituto de Investigación de la Cadena Láctea (IdICaL); Argentina. Fil: Roskopf, Pablo. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Investigación de la Cadena Láctea (IdICaL); Argentina. Fil: Di Rienzo, Julio Alejandro. Universidad Nacional de Córdoba. Facultad de Ciencias Agropecuarias; Argentina Fil: Marini, Federico. Sapienza University of Rome. Department of Chemistry; Italia Fil: Pandey, Pramod K. University of California at Davis. School of Veterinary Medicine; Estados Unidos Fil: Castillo, Alejandro. University of California. Cooperative Extension; Estados Unidos |
| description |
Objective: This study evaluated the effect of alfalfa (Medicago sativa) selenium (Se) biofortified via foliar applications on the concentration and speciation of Se in milk from dairy cows under grazing conditions. Materials and Methods: Two treatments, control and FertSe (alfalfa biofortified with 90 g of Na selenite/ha), were tested in a replicated crossover design with 2 periods, including a 9-d adaptation period and 5-d evaluation period, resulting in 4 experimental grazing groups, 5 cows each, 20 lactating Holstein dairy cows in total. Results and Discussion: The Se concentration in alfalfa pasture of the FertSe treatment increased 21 times when compared with the control pasture, from 0.15 to 3.17 mg/kg of DM. The increment was also observed in the total diet because Se content (from 0.14 to 2.65 mg/kg of DM) and Se intake (from 2.9 to 54.9 mg/cow per day) both increased 19-fold. Our results indicate that of the total selenium (Se) intake in the FertSe treatment, 1.26 mg/d was transferred to milk, corresponding to a trans-fer efficiency of 2.29%. This efficiency was approximately 70% lower than that observed in the control treatment, where milk Se output was 0.23 mg/cow per day. Milk Se concentration increased 4-fold, from 15 to 65 μg/L of milk in control and FertSe, respectively. Organic Se was the predominant chemical form in milk, representing approximately 80% of total Se, compared with approximately 55% in alfalfa. Implications and Applications: Further research is needed to identify additional organic Se species in alfalfa and milk. Long-term studies are needed to assess the effects of pasture Se fertilization on milk yield and overall production efficiency. Several factors should be considered when estimating the appropriate Se fertilization rate and the resulting Se concentration in alfalfa: (1) the Se content of dietary ingredients; (2) potential antagonistic interactions with other minerals, (3) animal Se requirements; and (4) regulations established by the US Food and Drug Ad-ministration or by the competent regulatory authorities in other countries where selenium Se is regulated. |
| publishDate |
2026 |
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2026-09-16T12:48:36Z 2026-09-16T12:48:36Z 2026-10 |
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article |
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publishedVersion |
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http://hdl.handle.net/20.500.12123/27815 https://www.sciencedirect.com/science/article/pii/S2590286526000637 2590-2865 https://doi.org/10.15232/aas.2025-02787 |
| url |
http://hdl.handle.net/20.500.12123/27815 https://www.sciencedirect.com/science/article/pii/S2590286526000637 https://doi.org/10.15232/aas.2025-02787 |
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eng |
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Elsevier |
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Elsevier |
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Applied Animal Science 42 (5) : 459-466. (October 2026) reponame:INTA Digital (INTA) instname:Instituto Nacional de Tecnología Agropecuaria |
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