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| Registros recuperados: 13 | |
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| Roka, Fritz M.; Hoag, Dana L.. |
| Produced as a joint product, economic theory suggests that manure value could influence livestock management decisions such as herd size and optimal market weights. This study examines the concept of manure and its connection with optimal replacement age or market weight. A model of a swine finishing operation representative of North Carolina conditions is developed. Over the range of conditions considered, manure value is negative and does not affect market weights. The marginal per head change in manure value is small relative to the marginal per head change in net returns from pork production. Further, economies of scale with respect to irrigation cause manure value to increase with herd size. |
| Tipo: Journal Article |
Palavras-chave: Manure value; Market weight; Response surface; Swine; Livestock Production/Industries. |
| Ano: 1996 |
URL: http://purl.umn.edu/15234 |
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| Faria Filho,DE; Rosa,PS; Torres,KAA; Macari,M; Furlan,RL. |
| A study was carried out to elaborate response surface models using broiler performance data recovered from literature in order to predict performance and elaborate economic analyses. Nineteen studies published between 1995 and 2005 were retrieved using the systematic literature review method. Weight gain and feed conversion data were collected from eight studies that fulfilled the pre-established inclusion criteria, and a response surface model was adjusted using crude protein, environmental temperature, and age as independent variables. The models produced for weight gain (r² = 0.93) and feed conversion (r² = 0.85) were accurate, precise, and not biased. Protein levels, environmental temperature and age showed linear and quadratic effects on weight gain... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Crude protein; Environmental temperature; Regression analysis; Response surface; Slaughter age; Systematic literature review. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2008000200009 |
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| Gonçalves,CA; de Almeida,MA; Faria-Júnior,MJA; Pinto,MF; Garcia-Neto,M. |
| Nutritionists need to make commercial decisions about the optimal nutrient content broiler feeds. In order to demonstrate that broiler prices may influence dietary nutrient density, this study developed quadratic feed intake and weight gain equations, according to broiler sex and feeding phase, to be applied in a nonlinear feed formulation model. Four hundred and eighty Cobb broilers were allotted to a completely randomized experimental with six treatments, each with four replicates of 10 birds each, from 1 to 56 days old. Treatments consisted of diets containing 2800, 2900, 3000, 3100, 3200, or 3300 kcal metabolizable energy (ME)/kg and constant nutrient to ME ratio. A nonlinear version of the PPFR feed formulation software (http://www.fmva.unesp.br/ppfr)... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Energy; Excel; Mathematical modeling; Nutrition; Response surface. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-635X2015000200173 |
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| Franco,Ademir; Abreu Junior,Cassio Hamilton; Perecin,Dilermando; Oliveira,Fernando Carvalho; Granja,Ana Carolina Ribeiro; Braga,Vivian Santoro. |
| The use of sewage sludge in Brazilian agriculture was regulated by the resolution no. 375 Conama, in 2006. However, there is a lack of research to adequate the mineral N and P fertilizer doses to be applied in agricultural fields treated with this residue. In a field experiment, the effects of application rates of sewage sludge and mineral N and P fertilizers on the productivity and technical characteristics of the cane-plant and first ratoon (residual effect) crops were evaluated. Four doses of sewage sludge (0, 3.6, 7.2 and 10.8 t ha-1, dry base), of N (0, 30, 60 and 90 kg ha-1) and of P2O5 (0, 60, 120 and 180 kg ha-1) were combined in a factorial and laid out on randomized block design, a with two replications. To evaluate the residual effect of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Technical quality; Sugarcane; Crop yield; Urban wastes; Saccharum spp; Response surface. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832010000200029 |
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| Souza,Diego Mendes de; Morais,Pedro Augusto de Oliveira; Matsushige,Ivã; Rosa,Luismar Alves. |
| ABSTRACT Soil organic matter (SOM) is important to fertility, since it performs several functions such as cycling, water and nutrient retention and soil aggregation, in addition to being an energy requirement for biological activity. This study proposes new trends to the Embrapa, Walkley-Black, and Mebius methods that allowed the determination of SOM by spectrophotometry, increasing functionality. The mass of 500 mg was reduced to 200 mg, generating a mean of 60 % saving of reagents and a decrease of 91 % in the volume of residue generated for the three methods without compromising accuracy and precision. We were able to optimize conditions for the Mebius method and establish the digestion time of maximum recovery of SOM by factorial design and response... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: SOM; Spectrophotometry; Increase in functionality; Response surface. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832016000100419 |
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| Ruschel,Jonas; Carmello,Quirino Augusto de Camargo; Bernardi,Alberto Carlos de Campos; Carvalho,Sérgio Alves de; Mattos Jr.,Dirceu. |
| Analysis of leaf nutrient contents can demonstrate plant nutritional status, identify symptoms of deficiency and toxicity, and evaluate the need to adjust fertilization programs. This research determined N:P:K:Ca:S rates for optimal nutrition of Rangpur lime - RL (Citrus limonia Osb.) rootstock, in an experiment arranged in a fractional factorial design of the (¹/25) 5(4) type, with 25 treatments distributed within five blocks. Seedlings of RL were transplanted into 3.8-dm³ containers filled with commercial growing media, when plant height = 10 cm, in a nursery. Treatments consisted of the following nutrient rates (g per plant): N = 0.31, 0.62, 1.25, 2.5 and 5; K = 0.4, 0.62, 1.25, 2.5 and 5; P = 0.35, 1.0, 2.0, 3.0 and 4.0; and Ca = 3.5, 5.0, 6.0, 7.0 and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Citrus limonia; Mineral nutrition; Leaf analysis; Response surface. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162004000500007 |
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| Veloso, Rogério de Carvalho; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Pires, Aldrin Vieira; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Timpani, Vivian Dagnesi; universidade federal dos vales do jequitinhonha e mucuri; Drumond, Eduardo Silva Cordeiro; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Gonçalves, Flaviana Miranda; Universidade Federal dos Vales do Jequitinhonha e Mucuri; Faria Filho, Daniel Emygdio de; Universidade Federal de Minas Gerais. |
| O objetivo deste trabalho foi estabelecer os níveis de proteína bruta e energia metabolizável para melhor desempenho em ganho de peso, peso corporal, consumo de ração e conversão alimentar em codornas de corte. Utilizaram-se 540 codornas de corte, durante três períodos experimentais: inicial (1 ao 21 dia), crescimento (22 ao 35 dia) e terminação (36 ao 49 dia). Os tratamentos foram constituídos pela combinação de cinco níveis de proteína bruta (18, 20, 22, 24 e 26% de PB) com três níveis de energia (2.700, 2.900 e 3.100 kcal EM kg-1), distribuídos em três blocos. Os modelos de regressão por superfície de resposta foram adotados como método de análise estatística. A melhor conversão alimentar ocorreu na fase de crescimento (22 ao 35 dia) independente do... |
| Tipo: Superficie de resposta |
Palavras-chave: 5.04.02.00-5 Coturnix coturnix coturnix; Desempenho produtivo; Superfície de resposta; Exigência nutricional Coturnix coturnix coturnix; Performance; Response surface; Nutritional requirements. |
| Ano: 2012 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/12589 |
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| SUFIATE,BRUNA L.; SOARES,FILIPPE E.F.; GOUVEIA,ANGÉLICA S.; MOREIRA,SAMARA S.; CARDOSO,EVANDRO F.; TAVARES,GABRIELLA P.; BRAGA,FABIO R.; ARAÚJO,JACKSON V. DE; QUEIROZ,JOSÉ H. DE. |
| ABSTRACT The aim of this study was to optimize the dextranase production by fungus Pochonia chlamydosporia (VC4) and evaluate its activity in dextran reduction in sugarcane juice. The effects, over the P. chlamydosporia dextranase production, of different components from the culture medium were analyzed by Plackett-Burman design and central composite design. The response surface was utilized to determine the levels that, among the variables that influence dextranase production, provide higher production of these enzymes. The enzymatic effect on the removal of dextran present in sugarcane juice was also evaluated. It was observed that only NaNO3 and pH showed significant effect (p<0.05) over dextranase production and was determined that the levels which... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Sugarcane juice; Dextranase; Pochonia chlamydosporia; Plackett-Burman; Response surface. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000100461 |
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| Kato,H.C.A.; Lourenço,L.F.H.; Araújo,E.A.F.; Sousa,C.L.; Joele,M.R.S. Peixoto; Ribeiro,S.C.A.. |
| The goal of this study was to evaluate sous vide fish and assess the influence of time and temperature on the pasteurization process through quality parameters. The raw material (tambaqui fillets) and the sous vide underwent physical, physicochemical, and microbiological analyses. A sauce was prepared containing soy sauce, water, horseradish and garlic flakes. The product's pasteurization parameters of time and temperature were defined according to a 22 central composite rotatable design (CCRD), and the dependent variables were water holding capacity (WHC) and instrumental texture aiming at obtaining high WHC values for the product to maintain the desired juiciness. The microbiological analysis required by legislation have indicated that the fish fillets... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fish; Tambaqui; Texture; Response surface. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352016000100224 |
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| Bonfá,Caroline Salezzi; Guimarães,Cíntia Gonçalves; Evangelista,Antônio Ricardo; Santos,Alexandre Soares dos; Guimarães,Amanda Gonçalves; Gandini,Elizzandra Marta Martins. |
| ABSTRACT We evaluated the contents of dry matter (DM), crude protein (CP), mineral matter (MM), soluble carbohydrates (CHOS), ammonia nitrogen (N-NH3), neutral detergent fiber (NDF), and acid detergent fiber (ADF) in sugarcane silages to which different levels of inclusion (LI) of crambe bran (CB) were added in proportions of 0, 3, 10, 17 and 20% at different storage times (ST). Laboratory silos were used, predetermined ST being 0, 3, 7, 12, 24, 36, 41, and 60 days after silage. For statistical analysis, the response surface methodology was used, in which LI and ST served as independent factors and response variables as dependent factors. The levels of DM and CP increased linearly with NI; however, it did not show any significant response regarding ST. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiesel; Co-product; Response surface; Sustainability.. |
| Ano: 2020 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542020000100301 |
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| Scher,Caroline Fenner; Brandelli,Adriano; Noreña,Caciano Zapata. |
| ABSTRACTYacon roots contain inulin, which has prebiotic properties and it may be used as sucrose or fat substitutes. However, inulin is very soluble in water. The loss of this important nutrient during blanching is caused mainly by diffusion or leaching, which might be diminished if blanching temperature - time conditions are correctly employed. The aim of this study was to determine the leaching of the sugars inulin, glucose and fructose, present in yacon roots, during hot water blanching under different time/temperature conditions. The samples were cleaned and peeled and cut into geometric forms of 1.75 ± 0.35 mm thick disks. A complete factorial experimental design was used, and the treatments of the samples were compared using the Tukey test. The... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Glucose; Fructose; Prebiotic; Response surface. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000500523 |
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| Registros recuperados: 13 | |
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