52 research outputs found
Metabolitos secundarios no fenólicos en el follaje de árboles y arbustos. Efecto en la fisiología digestiva de rumiantes
Using the foliage of trees and shrubs in ruminant feeding is an important alternative for the development of sustainable animal production; however, foliage contains antinutritional secondary compounds which act as defense mechanisms against microorganisms, insects, and predators. Nevertheless, some of these compounds can be beneficial for animals. There are several thousands of these compounds grouped according to the chemical substances that constitute them. The most relevant for ruminant nutrition are phenolic compounds (mainly tannins), nitrogen toxins (alkaloids, cyanogenic glycosides, toxic aminoacids, lecithin, and protease inhibitors), and terpenoids (fundamentally saponins). Some considerations on the non-phenolic secondary metabolites in the foliage of trees and shrubs and their effects on ruminant digestion physiology are discussed in this research paper.El uso del follaje de árboles y arbustos en la alimentación de los rumiantes es una importante alternativa para el desarrollo de una producción animal sostenible; sin embargo, presentan compuestos secundarios con actividad antinutricional, que actúan como mecanismos de defensa contra microorganismos, insectos y depredadores. No obstante, algunos de ellos pueden ser beneficiosos para los animales. Existen varios miles de estos compuestos, los que se agrupan según las sustancias químicas que los constituyen; los más relevantes para la nutrición de rumiantes son los compuestos fenólicos (principalmente taninos), toxinas nitrogenadas (alcaloides, glicósidos cianogénicos, aminoácidos tóxicos, lectinas e inhibidores de las proteasas) y terpenos (fundamentalmente saponinas). En este trabajo se realizan algunas consideraciones acerca de los metabolitos secundarios no fenólicos del follaje de árboles y arbustos y de su efecto en la fisiología digestiva de los rumiantes
Season and Enterprise Effects on Cow Milk Production Indicators in Ciego de Ávila.
The effects of season and enterprise on cow milk production indicators between 2008 and 2012 in the province of Ciego de Ávila, Cuba, are presented. Official information of the productive, economic, and financial indicators from the Economic and Production Departments of the enterprises evaluated was used. The mean productivity and effi-ciency indicators were calculated from the basic information collected. Descriptive statistical analysis and variable comparisons between seasons and enterprises were made. The bio-economic indicators in the rainy season produced the least unfavorable results. More than one milk kg/cow was produced in the rainy season, and yields per area had a mean of 8.2 and 12.9 kg of milk/ha/month in the dry and rainy seasons, respectively. Different results were observed in annual efficiency and production indicators, both primary and secondary. Ruta Invasora was the enterprise with the best productive results; whereas Orlando González Enterprise had the highest overall yields
Efecto de la época y la empresa en indicadores de producción de leche vacuna en Ciego de Ávila.
Se presenta el efecto de la época y la empresa en indicadores de producción de leche vacuna en la provincia de Ciego de Ávila, Cuba, entre los años 2008 y 2012. Se tomó la información institucional de indicadores productivos, económicos y financieros de los Departamentos Económicos y de Producción de cada una de las empresas evaluadas. A partir de la información primaria obtenida se calcularon indicadores de productividad media y eficiencia. Se reali-zaron análisis de estadística descriptiva y comparaciones de variables entre épocas y empresas. Los indicadores bio-económicos tienen los resultados menos desfavorables en la época de lluvia; por ejemplo, se obtiene más de un kg de leche/vaca en época de lluvia y la producción por área tuvo una mediana de 8,2 y 12,9 kg de leche/ha/mes en seca y lluvia, respectivamente. Las empresas mostraron resultados diferentes en indicadores primarios y secundarios anuales de eficiencia y productividad: se destaca con mejores resultados productivos la Empresa Ruta Invasora. La Em-presa Orlando González tuvo, de manera general, los menores desempeños.Season and Enterprise Effects on Cow Milk Production Indicators in Ciego de Ávila.ABSTRACTThe effects of season and enterprise on cow milk production indicators between 2008 and 2012 in the province of Ciego de Ávila, Cuba, are presented. Official information of the productive, economic, and financial indicators from the Economic and Production Departments of the enterprises evaluated was used. The mean productivity and effi-ciency indicators were calculated from the basic information collected . Descriptive statistics analysis and variable comparisons between seasons and enterprises were made. The bio -economic indicators showed the least unfavorable results in the rainy season. More than one milk kg/cow is produced in the rainy season, and yields per area had a mean of 8.2 and 12.9 kg of milk/ha/month in the dry and rainy seasons, respectively. Different results were observed in annual efficiency and production indicators, both primary and secondary. Ruta Invasora was the enterprise with the best productive results; where as Orlando Gonzalez enterprise had the highest overall yields
Sustainability of Cow Milk Production Units in Marcos Espines Jurisdiction, Tungurahua-Ecuador.
Physical and productive indicators were assessed in 70 cattle dairies (CaDa), along with the technical, environ-mental, economic and social sustainability indicators of 10 CaDa in Marcos Espinel jurisdiction, Píllaro Canton, Tungurahua-Ecuador, and the dynamic behavior of these indicators for 10 years in a case CaDa. The CaDas averaged 150 l of milk/day, with animal production of 15 l of milk/day, stocking rate over two animals/ha and herd made of 20-25 animals. Chemical fertilizers were widely used in the pasture lands; commercial supplements were used as well. The labor costs were high; everything was associated to cost increases in milk production and a decrease in farm cost-effect indicators. The technical, social, and economic sustainability indicators accounted for 100 % im-pairment in the units; the environmental indicators revealed positive values. However, the rate of special sustainable cattle raising indicated unsustainability for all the case CaDas. The dynamic behavior of sustainability in the case CaDa showed positive values for some indicators, such as energy efficiency; and impairment of others, such as economic sustainability. The study concluded that the CaDa had a generally unsustainable behavior
Valor nutritivo de las fracciones solubles e insolubles del follaje de Gliricidia sepium (Jacq.) Kunth ex Walp
Nutritional potential of water-soluble and water non-soluble leafage of Gliricidia sepium, tested by ruminant degradability and in vitro gas production techniques, was studied.
Ruminant degradability of dry matter and nitrogen showed high values, i.e., 54,5 to
81,9 % and 73,2 to 92,1 %respectively. Lower values were registered in leafage with an older rebudding age or stem inclusion. Both water-soluble and water-nonsoluble leafage are nutritionally relevant. Water-soluble leafage nutritional contribution was higher during the first twelve-hour fermentation process. G. sepium leafage nutritional potential derives from its gradual nitrogen and energy supply to rumen micro-organisms.Se caracterizó la contribución nutritiva de las fracciones solubles e insolubles de diferentes follajes de G. sepium, medidos con las técnicas de degradabilidad ruminal y de producción de gas in vitro. Los potenciales de degradabilidad ruminal de la materia seca (entre 54,5 y 81,9 %) y el nitrógeno (entre 73,2 y 92,1 %) se pueden considerar altos. Los valores menores se alcanzan en follajes con mayores edades de rebrote y con inclusión de tallos. Tanto la fracción soluble como insoluble en agua realizan una importante contribución nutritiva; en las primeras 12 horas de fermentación la fracción soluble hace su mayor aporte. El valor nutritivo del follaje de G. sepium radica, fundamentalmente, en su aporte gradual de nitrógeno y energía a los microorganismos del rumen
Validation of Ovine Excreta Using in vitro Gas to Assess Feed for Ruminants
Ovine excreta as inoculum for biogasification was used to assess in vitro and in sacco nutritive value of tropical pastures for ruminants. Pastures under study were: Paspalum notatum, Cynodon nlemfuensis, Panicum maximum, Sporobolus indicus, and Desmodium sp. Excreta were collected on grassy pastures areas. CO2 systematic injections prevented strict anaerobic microorganisms contact with oxygen. A positive and significant correlation resulted from biogasification using either ovine excreta or ovine ruminal fluid. Determinant coefficient was 0,79. Panicum maxi- mum and Cynodon nlemfuensis reached the highest nutritive value, while Sporobolus indicus showed the lowest one. Key Words: ovine excreta, digestibility, nutritive valu
Algunos indicadores de la composición química del follaje de siete leguminosa arbóreas y arbustiva
Model Comparison to Interpret the Kinetics of in vitroGas Production with Bovine Excreta Used as Inoculum.
New models to help interpret the kinetics of in vitrogas production with bovine excreta used as inoculum were suggested. Samples of L. leucocephala, G. sepiumand P. maximum, with different gas production profiles, were used. The samples were submitted to the procedure for gas production and the volumes were determined every 3 h, in the first 30 h; then at 36; 48; 72 and 96 h. Five models were compared (two monophase and three biphase), and the parameters for better adjustment were determined. Mean squared error and the Durbin-Watson test were used as comparison criteria. It was concluded that the monophase models fall short to describe the kinetics of in vitrogas production with bovine excreta; whereas the biphase models with simple exponential components are useful. The biphase equation, where V = 0 for t < L and V = B * (1 – EXP (- C * (t - L))) for t ≥L classified as the most useful work is done with syringes
Principales frutos en el trópico y sub trópico generadores de esquilmos con potencial para la alimentación de rumiantes en México
- …