oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2020 ( 5 )

2019 ( 35 )

2018 ( 33 )

2017 ( 33 )

Custom range...

Search Results: 1 - 10 of 21945 matches for " Meyer Paula Marques "
All listed articles are free for downloading (OA Articles)
Page 1 /21945
Display every page Item
Efeitos da enramicina e monensina sódica sobre a digest?o de nutrientes em bovinos alimentados com dietas contendo alto nível de concentrados
Borges, Luiz Felipe de Onofre;Passini, Roberta;Meyer, Paula Marques;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000400013
Abstract: the objective of this trial was to study the effects of enramycin and sodium monensin administration on total digestibility of diet nutrients and digestible dry matter intake in bovine. twelve non-pregnant and non-lactating cows (675 kg ± 63 bw) were randomly assigned to three treatments: control group, enramycin-treated group or monensin-treated group. animals received a diet containing 60% of concentrates (corn, soy bean meal and minerals) and 40% of forage (sugarcane). treatments were 20 mg/animal/day of enramycin or 300 mg/animal/day of monensin. trial lasted 21 days, the last 10 used for external marker administration (15 g of chromic oxide/animal/day) and the last 5 for feces collection and feed sampling. none of the antibiotics affected digestible dry matter and tdn intake and the digestibilities of dry matter, crude protein, ether extract, acid detergent fiber, neutral detergent fiber, starch, gross energy or total digestible nutrients.
Valor nutritivo da silagem de girassol inoculada com bactérias ácido-láticas
Rodrigues, Paulo Henrique Mazza;Almeida, Tatiana Ferrante de;Meyer, Paula Marques;Borgatti, Laura Maria Oliveira;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000100038
Abstract: the objective of the study was to evaluate effects of microbially inoculated sunflower silage on total digestibility in ovines. eight animals were assigned to a cross-over design, with two sub-periods (8 animals/treatment). treatments were composed of sunflower silage (17.3% dm and 13.8% cp, on average) control or microbially inoculated with s. faecium plus l. plantarum (pioneer 1174 product). each experimental sub-period lasted for twenty-one days, where the last five were used for feces and urine collection. the inoculation decreased the digestibility of adf (45.9% vs 50.2%), but it did not influence total digestibility of dm (57.0% vs 57.8%), cp (54.6% vs 55.1%), ee (63.6% vs 65.3%), nfc (81.79% vs 81.33%), ndf (43.7% vs 44.3%), starch (78.7% vs 74.1%), tdn (52.5% vs 53.0%), n retention (-0.93 vs -0.65 g of n/animal/day) or dm intake (2.49 vs 2.54% of bw).
Desempenho pós-desaleitamento de bezerros holandeses que receberam sucedaneo ou leite integral e milho floculado no concentrado inicial
Bagaldo, Adriana Regina;Pires, Alexandre Vaz;Meyer, Paula Marques;Susin, Ivanete;Mattos, Wilson Roberto Soates;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000300031
Abstract: growth performance was evaluated in 72 holstein calves fed milk replacer or whole milk diet and a starter containing steam-flaked corn at: 283, 360 or 437 g/l. the animals were blocked by birth and sex in a 2 x 3 factorial design. enzymatic in vitro starch availability of the steam-flaked corn decreased as grain densities increased. during the post-weaning period, there was no effect of the processed corn at the different densities and type of the liquid diet on dry matter intake, daily body gain, feed conversion and age when calves started eating corn silage (when the starter intake reached 2500 g/day). calves fed milk replacer during pre-weaning period showed the lowest body weight at 120 days old (108.9 vs. 118.5 kg).
Adi??o de probiótico ao leite integral ou sucedaneo e desempenho de bezerros da ra?a holandesa
Meyer, Paula Marques;Pires, Alexandre Vaz;Bagaldo, Adriana Regina;Simas, José Manuel Correia de;Susin, Ivanete;
Scientia Agricola , 2001, DOI: 10.1590/S0103-90162001000200001
Abstract: the possibility of limiting antibiotics as growth stimulants for farm animals has produced a climate in which both consumers and manufacturers are looking for alternatives. probiotics are being considered to exercise this role, and for this reason, 79 newborn holstein calves were used to evaluate the effects of lactobacillus acidophilus, enterococcus faecium and saccharomyces cerevisiae additions to whole milk or milk replacer. calves were assigned at birth to a completely randomized design with a 3x2 factorial arrangement of treatments. factors were: 1- whole milk: milk replacer at 3 days of age: milk replacer at 15 days of age; 2- probiotic supplementation or not. animals remained on the trial until 15 days after weaning. probiotic supplementation to calves fed milk replacer at 3 days of age improved preweaning daily body gain (with probiotic=0.22 vs. without probiotic=0.16 kg day-1) and feed conversion (2.62 vs. 3.85), as well as, postweaning feed conversion (1.66 vs. 2.03). milk replacer fed calves had higher starter intake (milk replacer=0.22 vs. whole milk=0.19 kg day-1), but lower dry matter intake (0.61 vs. 0.67 kg day-1) and the lowest weight at weaning (49 vs. 59 kg). when milk replacer was started at 3 days, calves had higher starter intake (milk replacer at 3 days=0.25 vs. milk replacer at 15 days=0.20 kg day-1) and lower weight at weaning (47.3 vs. 51 kg) in relation to milk replacer starting at 15 days. age at weaning and mortality rate were not affected by the probiotic supplementation or liquid diet.
Valida o de modelos de predi o de nitrogênio uréico no leite, estimando-se o consumo individual pelo consumo do rebanho = Validation of models to predict milk urea nitrogen concentrations, using herd intake to estimate individual dry matter intake
Paula Marques Meyer,Paulo Fernando Machado,Arlei Coldebella,Laerte Dagher Cassoli
Acta Scientiarum : Animal Sciences , 2006,
Abstract: O objetivo deste trabalho foi validar modelos de predi o de nitrogênio uréico no leite (NUL), visando contribuir para avalia o nutricional de dietas de vacas. Foram utilizadas 8.833 observa es de vacas holandesas de um rebanho comercial. A produ o de leite, o pesovivo, o número de dias em lacta o e o número de lacta es foram coletados no dia da amostragem do leite. Amostras de leite foram coletadas mensalmente para determina o da sua composi o. Para a avalia o dos 3 modelos, foram medidas acurácia, precis o e robustez. O modelo 3, apesar de mais acurado (viés=-0,21 mg/dL), foi menos preciso (erro residual=5,24 mg/dL) que o modelo 2 (viés=-1,72 e erro residual=4,90 mg/dL), enquanto o modelo 1 foi o menos acurado (viés=2,93 mg/dL) e o menos preciso (erro residual=5,99 mg/dL). Houve falta de robustez para os 3 modelos. Os três modelos de predi o de NUL diferiram entre si quanto à acurácia, precis o e robustez. The objective of this study was to validate prediction models for milk urea nitrogen (MUN), aiming at evaluating utilization efficiency of diets for dairy cows. Data (8,833 observations) from Holstein cows were used. Milk production, body weight, days in milk and lactation number were collected on the milk sampling days. Milk samples were collected monthly for composition analysis. In order to evaluate the three models, accuracy, precision and robustness were tested. Despite being more accurate (mean bias=-0.21 mg/dL), model 3 was less precise (residual error=5.24 mg/dL) than model 2 (mean bias=-1.72 and residual error=4.90 mg/dL), while model 1 was the least accurate (mean bias=2.93 mg/dL) and the least precise (residual error=5.99 mg/dL). There was lack of robustness for the three models. Models for predicting MUN differ among themselves with regard to accuracy, precision and robustness.
Adi o de probiótico ao leite integral ou sucedaneo e desempenho de bezerros da ra a holandesa
Meyer Paula Marques,Pires Alexandre Vaz,Bagaldo Adriana Regina,Simas José Manuel Correia de
Scientia Agricola , 2001,
Abstract: A possibilidade de proibi o do uso de antibióticos como promotores de crescimento para animais de produ o tem feito com que consumidores e produtores procurem por alternativas. Os probióticos têm se mostrado promissores em cumprir este papel e por esta raz o, setenta e nove bezerros da ra a Holandesa foram utilizados para avaliar a adi o de probiótico constituído por Lactobacillus acidophilus, Enterococcus faecium e Saccharomyces cerevisiae ao aleitamento. Os animais foram distribuídos em um delineamento inteiramente casualizado, com arranjo fatorial de tratamentos 3x2, correspondendo ao tipo de dieta líquida (leite integral, sucedaneo ao 3° dia ou sucedaneo ao 15° dia de idade, com adi o ou n o de probiótico). O período experimental foi do nascimento até 15 dias após a desmama. O fornecimento de probiótico a bezerros(as) aleitados(as) com sucedaneo a partir dos 3 dias de idade melhorou o ganho de peso (com probiótico=0,22 vs. sem probiótico=0,16 kg dia-1) e convers o alimentar (2,62 vs. 3,85) até a desmama, e convers o alimentar (1,66 vs. 2,03) pós-desmama. Os bezerros aleitados com sucedaneo consumiram mais concentrado em rela o aos que receberam leite integral (sucedaneo=0,22 vs. leite=0,19 kg dia-1), mas consumiram menos matéria seca total (0,61 vs. 0,67 kg dia-1) e apresentaram menor peso à desmama (49 vs. 59 kg). Quando o uso de sucedaneo foi iniciado aos 3 dias, os bezerros apresentaram maior consumo de concentrado (sucedaneo aos 3 dias=0,25 vs. sucedaneo aos 15 dias=0,20 kg dia-1) e menor peso à desmama (47,3 vs. 51 kg) em rela o aos bezerros aleitados com sucedaneo aos 15 dias.
Accuracy, precision and robustness of different methods to obtain samples from silages in fermentation studies
Gomes, Rodrigo da Costa;Meyer, Paula Marques;Castro, Ari Luiz de;Saran Netto, Arlindo;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000600008
Abstract: the objective of this study was to evaluate accuracy, precision and robustness of two methods to obtain silage samples, in comparison with extraction of liquor by manual screw-press. wet brewery residue alone or combined with soybean hulls and citrus pulp were ensiled in laboratory silos. liquor was extracted by a manual screw-press and a 2-ml aliquot was fixed with 0.4 ml formic acid. two 10-g silage samples from each silo were diluted in 20 ml deionized water or 17% formic acid solution (alternative methods). aliquots obtained by the three methods were used to determine the silage contents of fermentation end-products. the accuracy of the alternative methods was evaluated by comparing mean bias of estimates obtained by manual screw-press and by alternative methods, whereas precision was assessed by the root mean square prediction error and the residual error. robustness was determined by studying the interaction between bias and chemical components, ph, in vitro dry matter digestibility (ivdmd) and buffer capacity. the 17% formic acid method was more accurate for estimating acetic, butyric and lactic acids, although it resulted in low overestimates of propionic acid and underestimates of ethanol. the deionized water method overestimated acetic and propionic acids and slightly underestimated ethanol. the 17% formic acid method was more precise than deionized water for estimating all organic acids and ethanol. the robustness of each method with respect to variation in the silage chemical composition, ivdmd and ph is dependent on the fermentation end-product at evaluation. the robustness of the alternative methods seems to be critical at the determination of lactic acid and ethanol contents.
Validation of models for predicting milk urea nitrogen concentrations, estimating dry matter intake by the NRC (2001)
Meyer, Paula Marques;Machado, Paulo Fernando;Coldebella, Arlei;Cassoli, Laerte Dagher;Coelho, Karyne Oliveira;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000500026
Abstract: the objective of this study was to validate three different models for predicting milk urea nitrogen using field conditions, attempting to evaluate the nutritional adequacy diets for dairy cows and prediction of nitrogen excreted to the environment. observations (4,749) from 855 cows were used. milk yield, body weight (bw), days in milk and parity were recorded on the milk sampling days. milk was sampled monthly, for analysis of milk urea nitrogen (mun), fat, protein, lactose and total solids concentration and somatic cells count. individual dry matter intake was estimated using the nrc (2001). the three models studied were derived from a first one to predict urinary nitrogen (un). model 1 was mun = un/12.54, model 2 was mun = un/17.6 and model 3 was mun = un/(0.0259 × bw), adjusted by body weight effect. to evaluate models, they were tested for accuracy, precision and robustness. despite being more accurate (mean bias = 0.94 mg/dl), model 2 was less precise (residual error = 4.50 mg/dl) than model 3 (mean bias = 1.41 and residual error = 4.11 mg/dl), while model 1 was the least accurate (mean bias = 6.94 mg/dl) and the least precise (residual error = 5.40 mg/dl). they were not robust, because they were influenced by almost all the variables studied. the three models for predicting milk urea nitrogen were different with respect to accuracy, precision and robustness.
Efeito da adi??o de níveis crescentes de polpa cítrica sobre a qualidade fermentativa e o valor nutritivo da silagem de capim-elefante
Rodrigues, Paulo Henrique Mazza;Borgatti, Laura Maria Oliveira;Gomes, Rériton Weldert;Passini, Roberta;Meyer, Paula Marques;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000400007
Abstract: the effects of increasing levels of citrus pulp on fermentation pattern and nutritive value of elephantgrass silage was evaluated. elephantgrass harvested at 90 days was ensiled with increasing levels of dried citrus pulp: 0, 2.5, 5, 7.5, 10, 12.5 and 15% (fresh matter basis). silages were produced in 28 plastic experimental silos (4 replicates/treatment) bearing bunsen valves. silos were opened 106 days after ensiling, when samples were taken for the analysis of silages organic acids and chemical components. silage dry matter concentration increased linearly with level of citrus pulp. the same effect was observed for the water soluble carbohydrate concentration and the "in vitro" dry matter digestibility. however, ammoniacal nitrogen and neutral detergent fiber levels decreased linearly with citrus pulp addition. the response was quadratic for organic acids (acetic, lactic and butyric) and ethanol. the maximum point for lactic acid was observed with 5.8% and the minimal point for acetic, butyric and ethanol was observed with 7.8%, 7.2% and - 3.7% of citrus pulp inclusion, respectively. citrus pulp did influence neither ph, nor lignin and propionic acid levels. inclusions of 4.7 to 7.6% of citrus pulp (fresh matter basis) are enough to improve the elephantgrass silage quality.
Efeitos do teor de carboidratos solúveis sobre as características da silagem de cana-de-a?úcar
Silva, Estela Jorge Alves da;Borgatti, Laura Maria Oliveira;Meyer, Paula Marques;Marino, Carolina Tobias;Rodrigues, Paulo Henrique Mazza;
Revista Brasileira de Zootecnia , 2008, DOI: 10.1590/S1516-35982008000800006
Abstract: the objectives of this trial were to quantify the water soluble carbohydrates (wsc) concentration present in sugarcane that nullifies ethanol production, and to evaluate the effects of wsc content on nutritive value and other fermentative characteristics of sugarcane silage. a completely randomized design was used with three treatments and four repetitions per treatment. sugarcane was squeezed in order to remove juice. in the first treatment, juice was totally added back to sugarcane (100%). in the second treatment, only 50% of the juice was added back to sugarcane, along with 50% of water. in the third, 100% of water was added, with no addition of juice. treatments resulted in wsc concentrations of 41.6, 34.0, and 23.0% on dry matter basis. the material was ensiled in 12 laboratory silos (plastic buckets). silos were opened 85 days after ensiling, when organic acids concentration and chemical composition of silages were determined. withdrawal of sugarcane wsc resulted in negative linear effects on dry matter, wsc concentration, and in vitro digestibility of dry matter, but with linear increase for acid detergent fiber, neutral detergent fiber, and lignin concentration. considering the fermentation data, there was linear decrease for dry matter losses, lactic and butyric acids, and ethanol concentration. no treatment effect on aerobic stability data was observed. ethanol production would be null if sugarcane had only 12.4% of water-soluble carbohydrates on dry matter basis.
Page 1 /21945
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.