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Copyright of Revista Estudiantil AGRO - VET is the property of Universidad Mayor de San Andres, Facultad de Agronomia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The objective of the work was to show how the Local Agricultural Innovation System (SIAL, for its initials in Spanish) in the Perico municipality, Matanzas province, Cuba, was able to solve productive challenges from the moment they were detected in the Management Multi-Actor Platform (MMP), which started with the problem of low yield in the production of Ipomoea batatas (sweet potato) in the productive zone La Angelina. For such purpose different scientific methods and research techniques were used, such as: context diagnosis, surveys, soil sampling, among others. In addition, the results that were reached in the territory with the implementation of this type of approach in the different dimensions, were systematized; which allowed to perform several learning cycles and, in turn, have a plan of measures to increase sweet potato yields and improve the soil as fundamental and irreplaceable resource, capable of supporting crops and life in general. [ABSTRACT FROM AUTHOR]

An experiment was made to determine the productive performance of growing and fattening pigs housed in a facility with deep bedding and the use of alternative feeds as basal diet. 32 crossbreed pigs were used under a completely randomized design with four replications and four experimental diets. The treatments applied were; dc: conventional diet based on corn and soybean; 50RB: 50% of sweet potato (Ipomoea batatas) root meal (RB); RBFM: 50% of RB + 8% of mulberry (Morus alba) leaves at the growth stage or 24% at the fattening one; RBFN: 50% of RB + 8% of nacedero (Trichanthera gigantea) leaves in the stage of growth or 24% in the fattening stage. Total food consumption (TC), average daily gain (ADG), final (PF), weight (PI), weight gain (IP) and feed conversion (CA) were assessed. A marked effect from the diets was observed (P <0.01) on the PF, IP, GDP and CT variables in the two stages. Pigs on 50RB showed similar values in all variables compared to dc. Differences were found in treatments RBFM and RBFN in the production variables: PF, IP, GDP and CA in favor of DC and 50RB. Sweet potato root can be incorporated in pig diets without affecting their productive parameters, while the addition of mulberry or Trichanthera leaves in the diet could impair animal performance. [ABSTRACT FROM AUTHOR]

Se realizó un experimento para evaluar la composición química, degradabilidad in vitro de la materia seca a 48 y 96 h (Deg48 y Deg96, respectivamente), producción acumulada de gases a 48 y 96 h (Gas48 y Gas96, respectivamente) y estimar la energía metabolizable (EM) del follaje de doce cultivares de batata (Ipomoea batatas Lam). Estos se identificaron como Huambanchero, Mariara, Topera, Tucutunemo, DLP2850,FNC765,15,21,44,45, 60 y 199069.1 y fueron cultivados durante 120 d en siete bloques, cada uno de 12 parcelas (21.6m2). No se observaron diferencias en la composición química (11.5 ± 1.3 % PC, 3.6 ± 0.2 % EE, 40.8 ± 3.2 % FND, 15.1 ± 1.5 % cenizas, 1.3 ± 0.3 % Ca y 0.56 ± 0.1 % P), Gas48 y Gas96 (216.5 ± 8.1 y 281.0 ± 18.5 mL, respectivamente), tasa fraccional de producción de gases (0.06 ± 0.004 mL/h) y fase de retraso (2.7 ± 0.24 h). El cultivar Mariara presentó las mayores (P < 0.01) Deg48 y EM(84.8 %y 13.7MJ/kg MS, respectivamente), mientras que los menores registros correspondieron a Huambanchero (72.1 % y 12.7 MJ/kg MS, respectivamente). La Deg48 presentó correlaciones positivas (r = 0.99, P< 0.01) con Gas96, tasa fraccional de producción de gases, fase de retraso y EM. Se concluye que el follaje de batata de los cultivares evaluados es un material fibroso con una composición química, parámetros de la fermentación ruminal, degradabilidad in vitro y EM que sugieren su uso como un recurso alternativo para la alimentación de rumiantes en el trópico. [ABSTRACT FROM AUTHOR]

This work was developed in a cooperative production unit (UBPC) from «Camilo Cienfuegos» Agricultural Enterprise, Santa Cruz del Norte town, Havana province, during 2005, which is geographically situated at 83° 10' N, 23° 10' W and 103 m over sea level, with the objective of studying the influence of the national phytostimulant FitoMas-E combined with the biofertilizer EcoMic® and mineral fertilization on sweet potato yield and other variables. Six treatments were studied in the experiment employing the clone INIVIT B 98-2. Results showed significant differences among treatments for those combinations studied, so proving crop answer to the combined application of phytostimulant, biofertilizers and mineral fertilization, besides obtaining yield increments of 50 % compared to the control. In general, this work showed that the combined application of phytostimulant FitoMas-E with an efficient AMF and 50 % mineral fertilization with NPK improves crop development and yields under production conditions. [ABSTRACT FROM AUTHOR]

Donating plants coming from tuberous root sprouts, belonging to a sweet potato (Ipomoea batatas (L.) Lam.) clone, INIVIT B 93-1, were placed in flasks containing water under the semicontrolled conditions of a laboratory to induce bud break, as well as vitroplants coming from the somatic embryos of leaf limb calluses; in both cases, leaf limbs were used to perform the molecular studies of Random Amplification Polymorphic DNA (RAPD), to identify the material and evaluate the genetic stability of plants obtained from somatic embryos. The total genomic DNA was extracted from the material mentioned before, through a homogeneous mixture of leaf limb tissue (1,0 g) and liquid nitrogen. DNA concentration was determined by means of spectrophotometry and materials were evaluated for 10 arbitrary primers, following Operon Technologies' protocol recommendations, which were: OPF-15, OPF-14, OPA-13, OPF-13, OPF-04, OPF-07, OPF-01, OPF-03, OPA-12 and OPF-05. PCR products were electrophoretically separated at 1.5 % agarose gel in a TBE buffer, and they were stained with etidium bromide before being observed on an UV transiluminator. The amplification patterns obtained were compared by evaluating bands, both for its presence (1) and absence (0) per each of the treatments, then observing a complete monomorphism in the donating material bands, compared to the one coming from somatic embryo vitroplants. [ABSTRACT FROM AUTHOR]

sweet potato: 'Nemañete', 'Jonathan', 'Jewel', 'RCB 3047-H' and 'RCB 39-IF' at the UNALM Plant Physiology Laboratory. The plants were analyzed under short day conditions of 10 and 11 hours obtained artificially by covering the plants from 4 pm to 7 pm and from 5 pm to 7 pm respectively; under a control treatment of 12,5 hours (spring-summer days and nights), and under an artificial 14,5 hours treatment obtained by breaking the night into two by a lightning period from 11 pm to 1 am. From the five genotypes only four of them flowered ('Nemañete', 'Jonathan', 'RCB 3047-H' and 'RCB 39-IF'). The best results were obtained under short conditions, mainly of 11 hours. The earliest genotype was 'Nemañete'. The flowering periods were different among genotypes and had no relation to the number of flowers. Reservant roots were favored under short day conditions of 10 hours for the 'RCB 39-IF' genotype (reduced flowering) and for the 'Jewel' genotype (lack of flowering). [ABSTRACT FROM AUTHOR]