Términos relacionados

63 resultados encontrados para: TEMA: Forraje
  • «
  • 1 de 7
  • »
PDF
Resumen en: Inglés |
Resumen en inglés

Objective: The aim of the experiment was to assess the effect of increasing amounts of Leucaena leucocephala forage on dry matter intake (DMI), organic matter intake (OMI), enteric methane production, rumen fermentation pattern and protozoa population in cattle fed Pennisetum purpureum and housed in respiration chambers. Methods: Five crossbred heifers (Bos taurus×Bos indicus) (BW: 295±6 kg) were fed chopped P. purpureum grass and increasing levels of L. leucocephala (0%, 20%, 40%, 60%, and 80% of dry matter [DM]) in a 5×5 Latin square design. Results: The voluntary intake and methane production were measured for 23 h per day in respiration chambers; molar proportions of volatile fatty acids (VFAs) were determined at 6 h postprandial period. Molar concentration of VFAs in rumen liquor were similar (p>0.05) between treatments. However, methane production decreased linearly (p<0.005), recording a maximum reduction of up to ∼61% with 80% of DM incorporation of L. leucocephala in the ration and no changes (p>0.05) in rumen protozoa population were found. Conclusion: Inclusion of 80% of L. leucocephala in the diet of heifers fed low-quality tropical forages has the capacity to reduce up to 61.3% enteric methane emission without affecting DMI, OMI, and protozoa population in rumen liquor.


2.
Capítulo de libro
Almacenamiento de carbono en bancos de forraje de especies leñosas en Yucatán
Casanova Lugo, Fernando ; Petit Aldana, Judith (coaut.) ; Solorio Sánchez, Francisco (coaut.) ; Díaz Echeverria, Víctor Francisco (coaut.) ; Villanueva López, Gilberto (coaut.) ; Ramírez Avilés, Luis (coaut.) ; López Martínez, Jorge Omar (coaut.) ;
Contenido en: Estado actual del conocimiento del ciclo del carbono y sus interacciones en México: Síntesis a 2017 Texcoco, Estado de México, México : Programa Mexicano del Carbono, 2018 página 583-589 ISBN:978-607-96490-5-0
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B9950 (Disponible)
Disponibles para prestamo: 1
PDF

3.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Energy utilization, nitrogen balance and microbial protein supply in cattle fed Pennisetum purpureum and condensed tannins
Piñeiro Vázquez, Ángel Trinidad (coaut.) ; Canul Solís, Jorge Rodolfo (coaut.) ; Alayón Gamboa, José Armando (coaut.) ; Chay Canul, Alfonso Juventino (coaut.) ; Ayala Burgos, Armín Javier (coaut.) ; Solorio Sánchez, Francisco Javier (coaut.) ; Aguilar Pérez, Carlos Fernando (coaut.) ; Ku Vera, Juan Carlos (coaut.) ;
Contenido en: Journal of Animal Physiology and Animal Nutrition Vol. 101, no. 1 (February 2017), p. 159-169 ISSN: 0931-2439
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The aim of the experiment was to assess the effect of condensed tannins (CT) on feed intake, dry matter digestibility, nitrogen balance, supply of microbial protein to the small intestine and energy utilization in cattle fed a basal ration of Pennisetum purpureum grass. Five heifers (Bos taurus × Bos indicus) with an average live weight of 295 ± 19 kg were allotted to five treatments consisting of increasing levels of CT (0, 1, 2, 3 and 4% CT/kg DM) in a 5 × 5 Latin square design. Dry matter intake (DMI) was similar (p > 0.05) between treatments containing 0, 1, 2 and 3% of CT/kg DM and it was reduced (p < 0.05) to 4% CT (5.71 kg DM/day) with respect to that observed with 0% CT (6.65 kg DM/day). Nitrogen balance, purine derivatives excretion in urine, microbial protein synthesis and efficiency of synthesis of microbial nitrogen in the rumen were not affected (p > 0.05) by the increase in the levels of condensed tannins in the ration. Energy loss as CH4 was on average 2.7% of the gross energy consumed daily. Metabolizable energy intake was 49.06 MJ/day in cattle fed low-quality tropical grass with a DMI of 6.27 kg/day. It is concluded that concentrations of CT between 2 and 3% of DM of ration reduced energy loss as CH4 by 31.3% and 47.6%, respectively, without affecting intakes of dry and organic matter; however, digestibilities of dry and organic matter are negatively affected.


4.
Artículo
PDF
Resumen en: Español | Inglés |
Resumen en español

La presencia de plaguicidas organoclorados en el ambiente es preocupante por su persistencia, potencial de transporte a larga distancia y grado de toxicidad para la fauna y los seres humanos. En México, Chiapas ocupa el primer lugar en la producción de alimentos orgánicos, y Tecpatán es el principal municipio productor de leche orgánica. El objetivo de este trabajo fue determinar la presencia de plaguicidas organoclorados en forraje para ganado lechero en unidades de producción de leche orgánica. Se eligieron tres unidades de producción de leche orgánica y se colectaron muestras de forraje y leche en cada unidad. Los plaguicidas se extrajeron y purificaron con base en lo establecido por la USEPA (United States Environmental Protection Agency) y se analizaron por cromatografía de gases con detector de captura de electrones. Los compuestos que rebasaron el límite máximo permisible según el Codex Alimentarius fueron lindano, heptacloro + epóxido de heptacloro y aldrín + dieldrín (37.5 ± 84, 62 ± 125 y 20 ± 50 ng.g-¹ base grasa, respectivamente). En las muestras de forraje los valores más altos fueron alfa + beta-HCH, lindano y heptacloro + epóxido de heptacloro (76.3 ± 140, 43 ± 105 ng.g-¹ y 40 ± 76 ng.g-¹ peso seco). Es probable que la destacada presencia de estos compuestos se deba a su utilización en el control de vectores en campañas de salud o de ectoparásitos del ganado de la región por parte de productores convencionales.

Resumen en inglés

The presence of organochlorine pesticides in the environment is a current topic due to the persistence, potential for long-range transport and toxicity to wildlife and humans. In Mexico, Chiapas has the first place in the production of organic food, where Tecpatan municipality is the first place of organic milk. Twenty-five years ago the farmers did not use organochlorine pesticides, but some conventional farmers employ this compounds for controlling pests and disease vectors with knowledge of the health authorities. The aim of this study was to determine the presence of organochlorine pesticides in feed for dairy cattle production of organic milk. Three production units of organic milk samples were chosen to collect fodder and milk for one year, considering wet and dry season. Pesticides were extracted and purified based on the provisions of the USEPA (United States Environmental Protection Agency) and analyzed by gas chromatography with electron capture detector (ECD 63Ni). The compounds that exceeded the maximum permissible limit by the Codex Alimentarius were lindane, heptachlor and heptachlor epoxide + aldrin + dieldrin (37.5 ± 84, 125 ± 62 and 20 ± 50 basis ng.g-¹ fatty base, respectively). In the forage samples the higher values were alpha + beta-HCH, lindane and heptachlor + heptachlor epoxide (76.3 ± 140, 105 ± 43 ng.g-¹ and 40 ± 76 ng.g-¹ dry weight). It is likely that the strong presence of these compounds is due to their use in vector control in health campaigns or ectoparasites of livestock in the region by conventional producers.


5.
- Artículo con arbitraje
*Solicítelo con su bibliotecario/a
Influence of the density of scattered trees in pastures on the structure and species composition of tree and grass cover in southern Tabasco, Mexico
Villanueva Partida, Carlos R. (coaut.) ; Casanova Lugo, Fernando (autor) ; Villanueva López, Gilberto (autor) ; González Valdivia, Noel Antonio (autor) ; Oros Ortega, Iván (autor) ; Díaz Echeverria, Víctor Francisco (autor) ;
Contenido en: Agriculture, Ecosystems and Environment Vol. 232 (September 2016), p. 1–8 ISSN: 0167-8809
Nota: Solicítelo con su bibliotecario/a
Resumen en: Inglés |
Resumen en inglés

The rapid deforestation of Tabasco due to extensive livestock farming has resulted in a decrease in the original forest cover. Silvopastoral systems represent an option for reversing this problem. A comparative study was conducted to determine the influence of tree density on the structure and species composition of scattered trees in pastures (STP) as well as the herbaceous coverage. A total of 16 livestock systems with 3 STP densities were selected: low (from 24 to 49 individuals ha-¹), medium (from 53 to 85 individuals ha-¹) and high (from 129 to 212 individuals ha-¹ . The diameter at breast height, total height, clear bole height and crown area of all trees in each plot were measured. Shannon’s and Simpson’s index values were determined along with the relative importance values (RIVs), and the herbaceous cover under the tree canopy was measured in dry and rainy seasons. A total of 64 species representing 31 botanical families were found. The structure and composition of the STPs are correlated with arboreal density, and thus, species diversity was greater under low and medium densities. The tree species with the highest RIVs were Ceiba pentandra (L.) Gaertn., Guazuma ulmifolia (Lam.), and Tabebuia rosea (Bertol.) DC. in low-density STPs; Cordia alliodora (Ruiz & Pav.) Oken., Schizolobium parahyba (Vell.) S.F. Blak., and T. rosea in medium-density STPs and Swietenia macrophylla (King.) , Gmelina arborea (Roxb.), and C. alliodora in high-density STPs. The herbaceous cover was lower under high arboreal densities in both seasons. The STPs at high densities are inferred to be more specialized because they present less arboreal species diversity and structure than low-density STPs, and these properties also affect the coverage of the associated herbaceous component.


6.
Capítulo de libro - Memoria en libro con arbitraje
*Solicítelo con su bibliotecario/a
Cinética ruminal de Panicum maximum L. cv. Tanzania en un sistema silvopastoril en Chiapas, México
Pérez Luna, Esaú de Jesús ; Ku Vera, Juan Carlos (coaut.) ; Jiménez Ferrer, Guillermo (coaut.) ; Pérez Luna, Yolanda del Carmen (coaut.) ; León Velasco, Horacio (coaut.) ;
Contenido en: 3° congreso nacional de sistemas silvopastoriles : VII congreso internacional sistemas agroforestales Misiones, Argentina : INTA Ediciones: Estación Experimental Agropecuaria Montecarlo, 2015 p. 151-155 ISBN:978-987-521-611-2
Nota: Solicítelo con su bibliotecario/a
Resumen en español

El presente trabajo tuvo como objetivo conocer el efecto de la Leucaena leucocephala sobre la degradación ruminal de la MS de P. maximum L. cv Tanzania en diferentes etapas fenológicas, que permita mejorar su valor nutricional. El experimento se realizó en el Centro Agropecuario de Capacitación y Desarrollo Sustentable, ubicado en el municipio de Chiapa de Corzo, Chiapas, México. Se utilizó un diseño completamente al azar con un arreglo factorial 2×4, donde el factor A fue el sitio experimental (monocultivo y silvopastoril) y el factor B, la edad del pasto (28, 56, 84 y 112 días de rebrote). Para conocer las constantes de degradación ruminal de la MS se empleó la técnica in situ propuesta por Orskov et al. (1980). Se utilizaron cuatro vaquillas (350 ± 5 kg PV) provistas de cánulas ruminales. Los resultados obtenidos para los parámetros de degradación in situ de la MS de P. maximum cv. Tanzania en las edades de corte evaluadas en ambos sistemas, mostraron diferencias estadísticas significativas (P˂0.05) particularmente en las constantes de degradación potencial, máxima y efectiva (77, 74.8, 62, 64% para monocultivo y 79, 75.3, 72 y 64% para el sistema silvopastoril, respectivamente). No obstante, este efecto no se observó para la degradación inicial y tampoco para la tasa de degradación. Los resultados obtenidos, demuestran el efecto positivo que provoca la presencia de la especie arbustiva asociada a la gramínea; dado que se obtuvo un mayor aporte de nutrientes, particularmente, de proteína y materia orgánica en el sistema silvopastoril, lo que evidencia el aprovechamiento del nitrógeno por parte del forraje en sus diferentes etapas de rebrote, el cual es fijado por la leguminosa y que seguramente, este efecto, influyó en una mayor degradación ruminal de la MS de la gramínea y por ende, su valor nutritivo.

Resumen en inglés

The aim of this study was to determine the effect of Leucaena leucocephala on ruminal DM degradation of P. maximum L. cv Tanzania in different phenological stages, to improve their nutritive value. The experiment was conducted at the Agricultural Training Centre and Sustainable Development, located in the municipality of Chiapa de Corzo, Chiapas, Mexico. A design was completely randomized in a factorial arrangement of 2×4, where factor A was the experimental site (monoculture and silvopastoral) and the B factor, pasture age (28, 56, 84 and 112 days regrowth). For constants MS rumen in situ technique proposed by Orskov et al. (1980) was used. Four heifers (350 ± 5 kg BW) fitted with ruminal cannulas were used. The results obtained for the parameters of degradation in situ DM P. maximum cv. Tanzania cutting ages tested on both systems showed statistically significant differences (P<0.05), particularly in the constant potential, maximum and effective (77, 74.8, 62, 64% for monoculture and 79, 75.3, 72 and 64 degradation % for the silvopastoral system, respectively). However, this effect was not observed for the initial degradation and also to degradation rate. The results obtained demonstrate the positive effect caused by the presence of shrub species associated with the grass; since a greater intake of nutrients was obtained, particularly protein and organic matter in the silvopastoral system, which demonstrates the use of nitrogen by forage at different stages of regrowth, which is fixed by the legume and surely this effect, influenced a greater ruminal degradation of DM of grass and hence their nutritional value.


7.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Forage yield and quality of Leucaena leucocephala and Guazuma ulmifolia in mixed and pure fodder banks systems in Yucatan, Mexico
Casanova Lugo, Fernando ; Petit Aldana, Judith (coaut.) ; Solorio Sánchez, Francisco Javier (coaut.) ; Parsons, David (coaut.) ; Ramírez Avilés, Luis (coaut.) ;
Contenido en: Agroforestry Systems Vol. 88, no. 1 (February 2014), p. 29-39 ISSN: 0167-4366
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
53373-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
Resumen en: Inglés |
Resumen en inglés

In tropical areas of Mexico, Leucaena leucocephala is widely used in silvopastoral systems. However, little information exists on other native woody species of high forage potential, such as Guazuma ulmifolia. The aim of this study was to evaluate the components of biomass, forage yield and quality, and availability of N in fodder banks of L. leucocephala, G. ulmifolia, and a mixture of both species during dry and rainy seasons, under sub-humid tropical conditions. The experimental unit was a 5 9 10 m plot, containing three rows with 2 m between rows; each row had 20 plant positions with 0.50 m between plants.Within each plant position therewas either a single plant, in the case of purecrop, or two plants, in the case of mixed of both species. A complete randomized block design with three repetitions was used. In both seasons, therewere a significantly greater proportion of leaves in the G. ulmifolia fodder banks (71 %) and in mixed fodder banks (69 %) than in L. leucocephala fodder banks (64 %). Consequently, these systems had leaf-to-stem ratios of 2.4, 2.2 and 1.9, respectively.

The forage yield of fodder banks was not influenced by season. Themixed fodder bank had greater forage yield (5.1 t DM ha-1) than the L. leucocephala fodder bank (3.4 t DM ha-1) in each season. Additionally, the mixed fodder bank accumulated more forage yield during the experimental period (10.2 t DM ha-1 - year-1) than G. ulmifolia (9.0 t DM ha-1 year-1) or L. leucocephala (6.9 t DM ha-1 year-1). The concentrations of CP, C and C:N were not influenced by season. Forage NDF and ADF concentrations were greater in the rainy season (476 g kg-1 DM) compared with the dry season (325 g kg-1 DM). Mixed fodder banks had the greatest N yield (185.9 kg ha-1) and consequently the greatest availability of N (371.8 kg N ha-1 year-1). We conclude that mixed fodder banks of L. leucocephala and G. ulmifolia are a better option for improving productivity and forage quality in comparison with pure fodder banks in Yucatan, Mexico.


8.
- Capítulo de libro sin arbitraje
*Solicítelo con su bibliotecario/a
Otros sistemas silvopastoriles
Villanueva López, Gilberto (autor) ; Maldonado García, Noel Mauricio (autor) ; Grande Cano, Jesús Daniel (autor) ; Hernández Daumás, Salvador (autor) ; Van Der Wal, Hans (autor) ;
Disponible en línea
Contenido en: Los sistemas silvopastoriles en Tabasco. Una opción para desarrollar una ganadería productiva y amigable con la naturaleza / coordinador: Noel Mauricio Maldonado García Villahermosa, Tabasco, México : Universidad Juárez Autónoma de Tabasco, 2013 p. 83-102 ISBN:978-607-6061-32-9
Bibliotecas: Villahermosa
Cerrar
SIBE Villahermosa
53054-20 (Disponible)
Disponibles para prestamo: 1
Nota: Solicítelo con su bibliotecario/a
PDF

9.
- Artículo con arbitraje
Resumen en: Inglés |
Resumen en inglés

Silvopastoral systems are a prototype of agroforestry with a livestock component, which may be characterized as cleaner production as they provide a variety of goods and services to society; one of their functions is to help adapt to and mitigate climate change. In this article, traditional silvopastoral systems with cattle are characterized, and 35 pastures with silvopastoral management in communities of the Lower Grijalva hydrographic region of Chiapas and Tabasco in Southeastern Mexico are evaluated. This article discusses the general context as well as technical and economic aspects of the cattle raising units (CRU). The high frequency (71%) of land use conversion from maize fields to pastures demonstrates that a significant process of increased establishment of cattle raising is under way. Pastures have an average age of 17.9 years, soils are of medium to high quality, and the dominant herbaceous species are grasses. Scattered trees (ST) in pastures are remnants of the original vegetation which has largely disappeared due to change in land use, with 53 species belonging to 24 botanical families and an average density of 12.3 trees ha−1. In living fences (LF), 32 tree species belonging to 18 botanical families were found, with an average density of 45.8 trees per 100 linear m. It is estimated that on average, one hectare of pasture with a dominance of Cynodon plectostachyus grass (13.10 Mg C ha−1) surrounded by a living fence (7.28 Mg C ha−1) and containing scattered trees (3.00 Mg C ha−1) has a total accumulation of 23.38 Mg C ha−1.

Finally, provision of several environmental services, levels of production or yields, and animal products of the CRU with treeless pastures and with two types of silvopastoral systems are analyzed. In order to be considered a form of sustainable development, traditional silvopastoral systems must gradually be transformed into intensive silvopastoral systems. This requires the commitment and co-responsibility of all social actors involved in order to plan community-based, municipal, state-wide, and national policy related to agroforestry with an animal component.


PDF