Marisa WawrzkiewiczUniversity of Buenos Aires | UBA · Department of Animal Production
Marisa Wawrzkiewicz
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43
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Publications
Publications (43)
Bamboo cultivation in Argentina could represent a major economic activity if its various applications were revealed. This study characterized the anatomy and micromorphology of leaf blades by optical and scanning electron microscopes. Foliage leaves presented predominant parenchyma and scarce sclerenchyma. Foliage chemical and biological compositio...
Livestock systems based on subtropical and tropical pastures are characterized by the low productivity of livestock due to the poor nutritional value of the forage (low nitrogen concentration and digestibility, and high fiber and lignin concentrations). These conditions lead to low productivity and, consequently, high absolute emissions of methane...
BACKGROUND
The in vitro gas production technique has been used to evaluate forage fermentation kinetics. However, individual and animal species variation can change fermentation patterns due to differences in ruminal environment and microbiota. The aim was to verify whether rumen inoculum (RI) of llama had superior intrinsic digestion capacity and...
In vitro gas production techniques represent a valuable tool to describe the kinetics of ruminal degradation of food. However, the ruminal liquor used as a microbial inoculum has been a great source of variation and error. A standardization of this factor should contribute to assure the independence of food fermentation parameters from those of the...
Los subproductos provenientes de la agroindustria suelen presentar una alta variabilidad en su calidad nutricional. Esto resulta problemático al momento de utilizarlos en dietas destinadas a producción animal. En el presente trabajo se analizó mediante ensayos químicos, in sacco y encuestas el perfil nutricional y la variabilidad de expellers y har...
The objective of this study was to assess the ruminal microbial population and
fermentation of sheep and llamas fed low quality forages. Two llamas and three sheep
with permanent ruminal cannula were fed ad libitum with a low quality fescue hay
(Festuca arundinacea Schreb). The animals were adapted to forage feeding for 21 days,
followed by one day...
Ruminants are capable of degrading and fermenting the forage cell wall components. In reticulo-rumen, the microbial fermentation
partition gross energy of the substrate into volatile fatty acids, microbial biomass (MB) and waste gases (e.g. methane, CH4). These
gases are eliminated and they represent, not only environmental pollution due to its gre...
V Congreso internacional sobre cambio climático y desarrollo sustentable
Para frutos de tres leñosas nativas (Acacia aroma, Prosopis kuntzei y Caesalpinia paraguariensis), clave en los sistemas ganaderos campesinos del Chaco seco por su elevada producción y disponibilidad invernal de forraje, se analizaron: materia seca, cenizas, proteína bruta; fibra insoluble en detergente neutro y ácido, lignina en detergente ácido;...
Methane emission factor (Ym) is directly involved to calculate the worldwide livestock methane inventories, hence it is important to refine the estimation of this parameter for different livesctock production systems. The purpose of this work was to generate refined mathematical models to predict CH4 emissions from an extensive compilated database...
La formulación de raciones requiere de la valoración energética de todos los ingredientes, sin embargo existen escasos modelos para predecir la digestibilidad in vitro de la materia seca (ivDMS) para concentrados proteicos basados en resultados de química húmeda. El objetivo fue desarrollar modelos de predicción de la ivDMS de concentrados proteico...
La producción de metano de los forrajes al ser digeridos por los rumiantes puede estar influida por su composición (e.g. presencia de compuestos antinutricionales como saponinas o taninos). La técnica de producción de gas (PG) in vitro permite medir la digestibilidad de la materia seca, estimar la degradabilidad y la producción de metano (PCH4). El...
El metano generado durante el proceso de digestión de los rumiantes, constituye una pérdida de energía, y contribuye al efecto invernadero. Las diferencias en la capacidad metanogénicas de diferentes forrajeras son previsibles, pero las dificultades técnicas han dificultado su uso para las evaluaciones de calidad. La técnica de producción de gas (P...
Relatively low ruminal pH values have been frequently registered in dairy cows grazing alfalfa, which can be involved in reducing feed digestion. An in vitro experiment was carried out to study the effect of ruminal pH (6.4, 6.1, 5.8 and 5.5) on the digestion of fresh alfalfa.
Decreasing the pH, in vitro gas production (ivGP) decreased (P < 0.05)....
Ten caimans (Caiman latirostris and Caiman yacare) of different length and live weight were slaughtered to assess carcass yield and meat quality traits. Carcass yield was 54% while meat portion was the 62%. The carcass meat/bone ratio was approximately 1,51 while the 6,4% corresponded to the fat depots, mostly visceral depots. The tail cut represen...
En la técnica de producción de gas in vitro el gas indirecto es producto del desplazamiento del buffer carbonato/bicarbonato (CB) tradicional y es una fuente de variación que no proviene de la fermentación del alimento. Por el contrario, el buffer fosfato/citrato (FC) no contiene compuestos en equilibrio con la fase gaseosa y en consecuencia no apo...
The objective of this work was to compare the traditional Van Soest's procedure to analyze neutral detergent fibers (NDF) and acid detergent fibers (ADF) using filtering crucibles (VS) with a semiautomatic method which uses filter bags in an ANKOM Technology Corp. instrument (ANK). Nine ruminant feeds widely used in the temperate region of Argentin...
α-Amylase activity was analysed in developing caryopses fromSorghumvarieties showing contrasting susceptibility to preharvest sprouting. Unsprouted caryopses from variety Redland B2 (very susceptible) showed α-amylase activity from 31 d after pollination (DAP) onwards, that were 20-fold higher than those observed for variety IS 9530 (very resistant...
The in vitro gas production technique was used as a tool to develop an improved prediction model of dry matter digestibility of ensiled forage based diets. Eleven diets were tested through conventional experiments of in vivo dry matter digestibility (DMD). The same diets were evaluated by the in vitro gas production technique using a gas pressure t...
