Estudio de materias primas alternativas a la torta de soja en alimentación de vacuno de leche y carne

El objetivo del ensayo fue evaluar el efecto de la torta de colza (TC), DDGS de maíz y DDGS de trigo frente a torta de soja (TS) en vacas lecheras sobre la producción de leche y su composición. Se emplearon veinticuatro vacas lecheras en un diseño experimental en cuadrado latino 4 x 4 con periodos de 28 días. También se realizó un ensayo de digestibilidad en ovinos y una evaluación de la dinámica de la degradabilidad ruminal de las materias primas del ensayo en vacas fistulizadas. No hubo diferencias significativas entre tratamientos para ninguno de los valores de digestibilidad de las raciones completas. Existieron diferencias significativas en la degradabilidad teórica de la MO y del N entre tratamientos (DDGS de trigo: 77,69 y 80,40%; DDGS de maíz: 69,30 y 59,60%; TC: 62,40 y 63,10% y TS: 76,0 y 69,60%, respectivamente). Sin embargo, no hubo diferencias significativas en la producción de leche ni en la producción de grasa y proteína entre los tratamientos. El porcentaje de grasa y proteína en la leche del tratamiento con DDGS de maíz (3,50 y 2,94%) fueron significativamente inferiores comparado con TS (4,04 y 3,09%) y TC (3,90 y 3,10%), respectivamente y no las hubo frente al DDGS de trigo (3,74 y 3,01%, respectivamente). El nivel de urea en leche presentó diferencias significativas entre tratamientos (TC: 148 mg/kg; TS: 131 mg/kg; DDGS de trigo: 127 mg/kg y DDGS de maíz: 87 mg/kg). Tampoco existieron diferencias significativas entre tratamientos en el consumo de alimento ni en la eficiencia del alimento ni en el peso vivo de los animales. Estos resultados indican que la TC, DDGS de maíz y DDGS de trigo pueden sustituir a TS en raciones de vacas lecheras sin efecto negativo sobre la producción de leche, grasa y proteína

Marine macroalgae in rabbit nutrition: in vitro digestibility, caecal fermentability, and microbial inhibitory activity of seven macroalgae species from Galicia (NW Spain)

The limitation on the prophylactic use of antibiotics in animal feed in Europe has critically challenged the rabbit meat industry, which urgently needs to find solutions. A feasible alternative could be using macroalgae in the diet to improve the gut health. This research studied seven species of marine macroalgae in four formats (dehydrated, enzymatically hydrolyzed, aqueous extract, and aqueous extract of hydrolyzed macroalgae) in order to select the most promising ones for their use in rabbit feed. Chemical composition, in vitro digestibility, in vitro caecal gas, total volatile fatty acid (VFA) production, and minimal inhibitory concentrations (MIC) against common pathogens were studied. All S. latissima products showed high caecal fermentability and VFA production, especially in both types of extracts. The H. elongata aqueous extract was remarkable due to its high in vitro butyrate production, which can be of great interest for improving gut health. The MIC results did not indicate any clear inhibition of the pathogens tested. The macroalgae tested appear to have a potentially prebiotic effect, rather than a direct antimicrobial activity. However, these results must be confirmed in vivo, in order to observe the real benefits of feeding macroalgae during the rabbit weaning period.Ministerio de Agricultura, Pesca y Alimentació

Por Doña Micaela de Vicuña, Ortiz, y Cegarra, viuda de Don Arnao Cegarra del Alcazar, ultimo posseedor ... de los Mayorazgos de la Palma y Gelo, tutora de don Arnao Cegarra del Alcaçar su hijo ... en el pleito de don Iuan Cegarra del Alcaçar su tio so

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Elements in Serum, Muscle, Liver, and Kidney of Rabbits Fed Macroalgae-Supplemented Diets

The addition of marine macroalgae to animal feed has garnered interest due to the demonstrated benefits of gut health in many livestock species. Most macroalgae have a higher mineral content than terrestrial vegetables, making them an attractive, sustainable source of minerals. However, some macroalgae contain elevated concentrations of iodine and arsenic, which may be transferred to the meat of livestock fed with macroalgae. This study evaluated the mineral profile of rabbit serum, muscle, liver, and kidney of rabbits fed diets supplemented with different marine macroalgae, with the goal of improving post-weaning gut health and reducing reliance on antibiotics. We found increased deposition of iodine in muscle, liver, and kidney due to macroalgae supplementation, which is particularly promising for regions with low iodine endemicity. Higher, though relatively low arsenic concentrations, compared to those in other animal meats and food sources, were also detected in the muscle, liver, and kidney of macroalgae-fed rabbits. The absence of apparent interactions with other micronutrients, particularly selenium, suggests that the inclusion of macroalgae in rabbit diets will not affect the overall mineral content. Enhanced bioavailability of elements such as phosphorus and iron may provide additional benefits, potentially reducing the need for mineral supplementation