Testes para verificar a igualdade de parâmetros e a identidade de modelos de regressão não-linear em dados de experimento com delineamento em blocos casualizados

Regazzi, Adair José; Silva, Carlos Henrique Osório

doi:10.1590/s0034-737x2010000300005

Cited by 124 publications

(168 citation statements)

References 9 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

Section: Limiting Amino Acidmentioning

confidence: 99%

“…To test the null hypothesis (the coefficients are similar for both sexes and all phases) and the alternative hypothesis (the coefficients are different at least for one sex and/or phase), the a and b coefficients estimated by equation (1) and u coefficients estimated by equation (2) for each phase and sex were compared using a likelihood ratio test for non-linear models as described by Regazzi (2003).…”

Section: Statistical Analysesmentioning

confidence: 99%

“…In addition, ND increased until it reached a plateau whereas NE showed an exponential increase (Table 3). Using the methodology described by Regazzi (2003), it was observed that despite the differences between sexes in NE for MC in the grower phase, both parameters of exponential fitted equations were the same.Supplementary Table S1 presents the ratios of ND and NI and of NE and ND in the MC trial. An interaction between sex Content/kg of product: Mn = 150 000 mg, Fe = 100 000 mg, Zn = 100 000 mg, Cu = 16 000 mg, I = 1500 mg.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

Donato

Sakomura

Silva

et al. 2016

Animal

View full text Add to dashboard Cite

The intensification of livestock have increased the emission of pollutants to the environment, leading to a growing interest in seeking strategies that minimise these emissions. Studies have shown that it is possible to manipulate diets by reducing CP levels and thus reducing nitrogen (N) excretion, without compromising performance. However, there is no knowledge of any study that has focused on reducing N excretion and relating this reduction to individual amino acids. This study investigated the effect of dietary methionine + cysteine (MC) and threonine (THR), the two most limiting amino acids for broiler production, on nitrogen excretion (NE) and nitrogen deposition (ND) and determined the efficiency of utilisation of both amino acids for protein deposition. Six trials were conducted to measure the NE and ND in broiler chickens during three rearing phases in response to dietary amino acid. The efficiency of utilisation of the amino acids was calculated by linear regression of body protein deposition and the amino acid intake. Despite the differences between sexes and phases, the efficiency of utilisation was the same, being 0.60 and 0.59 for MC and THR, respectively. The rate of NE behaved exponentially, increasing with amino acid intake, and can exceed 50% of N intake, being higher than ND. On average, for a reduction in intake of each unit of MC or THR (mg) there is a reduction of 0.5% of NE. Although this reduction seems low, considering that it corresponds to changes in one amino acid only, the impact on a large scale would be significant. Knowledge of how animals respond to NE and ND/protein deposition according to amino acid dietary content may represent new efforts towards reducing the impact on environment.Keywords: amino acids, efficiency of utilisation, environmental pollution, nutrition, poultry ImplicationsThis study shows the effect of amino acids on nitrogen excretion and deposition and on their efficiency of utilisation for protein deposition by broilers. The nitrogen originating from the poultry is an environmental pollutant. Provision of higher amounts of amino acids, besides not increasing protein deposition, also causes increased nitrogen excretion. Meeting animal's amino acids requirements, provides greater efficiency of utilisation of these amino acids, without affecting protein deposition in the animals, and thus reduces nitrogen excretion. In this way, the management of amino acids in broilers diets may allow new efforts to reduce the impact of intensification of livestock. IntroductionThe intensification of livestock have significantly increased the emission of pollutants to the environment, leading to a growing interest in seeking alternatives that minimise these emissions. The European Union has already implemented laws regulating environmental pollution, especially in regard to the emission of nitrogen (N) compounds, considered to be a critical pollutants affecting life on earth (European Commission, 2007). N compounds are responsible for pollution of groundwater due to nitrate lea...

show abstract

Section: Limiting Amino Acidmentioning

confidence: 99%

Section: Statistical Analysesmentioning

confidence: 99%

mentioning

confidence: 99%

See 1 more Smart Citation

Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

Donato

Sakomura

Silva

et al. 2016

Animal

View full text Add to dashboard Cite

show abstract

“…Noting that all three together, were significant by Pillai, Wilks, Roy and Hotelling-Lawley tests, was performed Tukey test for the same parameter e and compared with the first method. This procedure presented, with the same coefficient of significance, less able to identify differences between the means of the parameters of grass varieties than the method proposed by Regazzi (2015). …”

Section: Introductionmentioning

confidence: 97%

“…Observando que as três, conjuntamente, foram significativas pelos testes de Pillai, Wilks, Roy e Hotelling-Lawley, foi realizado o teste de Tukey para o mesmo parâmetro comparado com o primeiro método utilizado. Esse procedimento apresentou, com o mesmo coeficiente de significância, menor capacidade de identificar diferença entre as médias dos parâmetros das variedades de capim do que o mé-todo proposto por Regazzi (2015).…”

Section: Introductionunclassified

Análise de variância multivariada nas estimativas dos parâmetros do modelo log-logístico para susceptibilidade do capim-pé-de-galinha ao glyphosate

Jotta¹

View full text Add to dashboard Cite

AGRADECIMENTOSPrimeiramente, agradeço a Deus por sua infinda bondade e paciência,à minha família que mesmo com os percalços da vida se manteve unida e me proporcionou uma trajetória tranquila e feliz, em especial pelo papel fundamental em minha educação,à minha mãe , Vera Lúcia Degiato e ao meu pai, Jair Antônio Jotta, os responsáveis por todas as minhas conquistas.A todos os meus professores e em especial, ao meu professor do ensino fundamental Emerson Silva dos Santos, que me incentivou a nunca parar de estudar e ter o estudo como prática diária e contínua , sem seu trabalho as dificuldades encontradas seriam ainda maiores.Aos meus velhos e novos amigos que ao longo dos anos vêm se somando, tanto em quantidade como em posicionamento político. Espero que continue sempre assim.Em especial,à minha namorada e companheira de momentos bons e ruins, Patrícia Bongiovanni Catandi, por sempre ser a melhor companhia.A toda equipe do departamento de Ciências Exatas da ESALQ, em particular, a prof. Dra. Sônia Maria de Stefano Piedade por deixar as aulas e os dias mais agradáveis com seu espírito acolhedor e gentil,à prof. Dra. Renata Alcarde Sermarini por sempre estarà disposição para tirar dúvidas demonstrando se importar com o desenvolvimento do aluno. Ao meu professor e orientador Dr. Carlos Tadeu dos Santos Dias pelo acolhimento de prontidão e pela disposição sempre presentes com os assuntos de trabalho além da excelente companhia.Ao Lucas Rosa pelo seu trabalho e concessão do conjunto de dados.A Capes pelo auxílio financeiro concedido nestes dois anos de mestrado.

show abstract

Long‐term phosphate fertilization strategies evaluation in a Brazilian Oxisol

et al. 2020

View full text Add to dashboard Cite

There are concerns related to the application of phosphate fertilizers to weathered soils that present low soil test phosphorus (STP) due to P adsorption in iron oxyhydroxides. Furthermore, long-term trials are needed to evaluate crop response to corrective P fertilization and its interaction with different maintenance P fertilization strategies in these soils. An experiment involving the combination of three initial corrective P fertilization schemes (control without P correction or with the application of 105 kg P ha −1 as triple superphosphate [TSP] or reactive rock phosphate [RRP]), four P maintenance strategies (a control without the application of maintenance P, or 35 kg P ha −1 yr −1 as TSP, RRP, or a mix of both) and two application methods was cultivated during 16 yr at the Embrapa Cerrados experimental station in Planaltina, DF, Brazil. Corrective P fertilization promoted an early crop yield response. In contrast, high crop yields were only obtained in control treatments with no corrective P fertilization after soil P stocks were increased to a minimum level. With increasing P stocks, broadcast application resulted in slightly better yields. The required residual P stocks in soil to obtain high yields were estimated as equivalent to 113.6 and 205.2 kg P ha −1 for TSP and RRP, respectively. These values allow for STP contents to increase to critical levels, whose value for TSP of 4.1 mg kg −1 Mehlich-1 P is below that recommended for the region, possibly due to the contribution of organic P forms in the long-term no-tillage system.

show abstract

Testes para verificar a igualdade de parâmetros e a identidade de modelos de regressão não-linear em dados de experimento com delineamento em blocos casualizados

Cited by 124 publications

References 9 publications

Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

Manipulation of dietary methionine+cysteine and threonine in broilers significantly decreases environmental nitrogen excretion

Análise de variância multivariada nas estimativas dos parâmetros do modelo log-logístico para susceptibilidade do capim-pé-de-galinha ao glyphosate

Long‐term phosphate fertilization strategies evaluation in a Brazilian Oxisol

Contact Info

Product

Resources

About