The transit of external markers throughout the ruminant digestive tract: 2. The estimation of fiber digestibility, ruminoreticular fill, and related biases

Vieira, Ricardo Augusto Mendonça; Júnior, Nardele Moreno Rohem; Abreu, Matheus Lima Corrêa; Silva, M.C.; Oliveira, Jhone Gleison de; Tedeschi, L. O.; Glória, Leonardo Siqueira

doi:10.1016/j.anifeedsci.2020.114420

Cited by 9 publications

(5 citation statements)

References 67 publications

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“…Therefore, the models under the independence and homoscedasticity assumptions were fitted with an autoregressive correlation function (corCAR1) to challenge independence, and with a power-of-the-mean variance function (VarPower) to challenge homoscedasticity, or even by both (Pinheiro & Bates, 2000). The fit quality of the models was evaluated based on the information-theoretic (I-T) approach (Burnham, Anderson, & Huyvaert, 2011), with special reference to a nonlinear model selection framework (Vieira et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Standardization of processing parameters and color of gels aiming to replace citric pectin by mesocarp flour or pectin of passion fruit

Silva,

Oliveira,

Vieira

et al. 2023

Acta Sci Technol

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The processing of passion fruit generates a huge quantity of wastes, reaching 50% in mass of rind. The main use of the rinds is to produce rind flour or to be source of pectin as a gelling agent. This work develops a standard procedure to evaluate jelly products subjected to the same temperature histories and content of soluble solids along the processing time of the gel-based product, using different concentrations of mesocarp flour and pectin. The gels were evaluated by color patterns aiming to verify the applicability of mesocarp flour as substitute of commercial pectin in jelly of fruits. The quantitative analysis of the data for temperature histories and content of soluble solids enabled to confirm the standardization of the parameters used in the production of the gels, which is important to warrant the same processing conditions during the elaboration of the different types of gels. The gels made with passion fruit’s mesocarp flour have less translucent shades and a more yellowish color than the gels produced with commercial citric pectin, however, these small differences may not interfere in the final color of fruit jelly.

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Section: Discussionmentioning

confidence: 99%

Standardization of processing parameters and color of gels aiming to replace citric pectin by mesocarp flour or pectin of passion fruit

Silva,

Oliveira,

Vieira

et al. 2023

Acta Sci Technol

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“…Environmental conditions generated by year-to-year variations exert greater influence over the fibrous (aNDFom) content of the whole-corn crop than genotypes do (Kruse et al, 2008). This is important because both corn silage concentration and aNDFom quality affect intake (Oba and Allen, 1999;Tjardes et al, 2002;Huhtanen et al, 2008a;Vieira et al, 2008bVieira et al, , 2020. Because productive animals generally have an increased demand for nutrients, including fiber for rumen health (Van Soest, 1994), the selection of corn hybrids with higher nutritional values can provide more energy that is useful to the animal (digestible and metabolizable energies), especially when the aNDFom content constrains intake (Van Soest, 1994;Mertens, 2010;Akins and Shaver, 2014; a AICc r -Akaike information criterion corrected for small samples; Δ r -Akaike difference; w r -model probability; ER r -evidence ratio; and number of parameters (Θ r ) of the r-th model combination.…”

Section: Discussionmentioning

confidence: 99%

“…Differences regarding feed efficiency for milk production from cows fed silage made with nutrientdense, brown midrib, or dual-purpose corn hybrids are difficult to detect for some corn types cultivated in America; nonetheless, the phenotypic variation about fiber digestibility correlates to fiber quality, e.g., low lignin contents in brown midrib corn hybrids (Akins and Shaver, 2014). These are further evidences that the relationship between dietary aNDFom content and its digestibility is not constant (Van Soest, 1967;Huhtanen et al, 2006), and measures of fiber digestibility are necessary for predicting animal performance (Van Soest et al, 1992;Oba and Allen, 1999;Huhtanen et al, 2008b;Vieira et al, 2008bVieira et al, , 2020. However, we warn the readers that we biased our fiber results to some extent, because at the time we performed the fiber analyses, there were no Berzelius beakers without spouts in our laboratory (Silva et al, 2018).…”

Section: Discussionmentioning

confidence: 99%

A two-location trial for selecting corn silage hybrids for the humid tropic: forage and grain yields and in vitro fermentation characteristics

Bendia¹,

Oliveira²,

Azevedo³

et al. 2021

Revista Brasileira De Zootecnia

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The goal of our study was to evaluate the nutritional potential of dented corn hybrids for silage production. We performed a two-location trial in which 19 dented corn hybrids and five corn controls grew in four randomized blocks within two experimental areas located in the Northern (Campos dos Goytacazes) and Northwestern (Itaocara) Rio de Janeiro State, Brazil. We recorded yields of fresh and dry forage matter and yields of fresh and dry grain matter, as well as chemical composition variables. We interpreted variables by assuming a Normal distribution for yield variables and a Beta distribution for chemical composition and ratios. The SAS GLIMMIX procedure fitted the linear model under those assumptions. Dual-pool models fitted the gas production profiles generated by in vitro anaerobic fermentations. We used the nlme of R software to fit the dual-pool models and the information-theoretic approach to evaluate their quality of fit. We did a cluster analysis (NbClust of R) to group corn hybrids based on fresh and DM yields and kinetic parameters of in vitro gas production. Three clusters of corn hybrids stood out, their basic differences relied on fresh and DM yields. Nonetheless, the least-squares means for gas production characteristics among groups did not present disjoint confidence intervals. Therefore, we can infer that dented corn hybrids rank by forage yield, but not by forage quality, and recommend the most productive ones that consistently outstand in both locations (hybrids UENF-2203, UENF-2192, UENF-2193, and UENF-506-11).

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“…The model fitted with the variance function in equation 17 challenges the fitted one based on the traditional homoscedastic assumption described by equation 16. Parameter ω is the intercept of the VarConstPower function (equation 18), which allowed modeling the variances when |g(Θ m , t ijk )| = 0 or equal to a baseline or background value, and when the variance scales to the mean for |g(Θ m , t ijk )| > 0 or greater than a baseline value (Pinheiro and Bates, 2000;Rohem Júnior et al, 2020;Vieira et al, 2020). The fit of the model with the first-order autoregressive correlation structure given by equation 19 challenges the traditional assumption of independent time records on the same subject (Vonesh, 2012); this was accomplished by fitting the corCAR1 function of nlme package (Pinheiro and Bates, 2000).…”

Section: Model Fitting: First-step Predictionmentioning

confidence: 99%

“…The development of tools from theories of nonlinear mixed-effects models and generalized linear mixed-effects models (Pinheiro and Bates, 2000;Littell et al, 2006;Vonesh, 2012;Stroup, 2013) has provided instruments to describe several nonlinear phenomena in animal science (Zanton and Heinrichs, 2009;Strathe et al, 2010;Albertini et al, 2012;Araujo et al, 2015;Vieira et al, 2018Vieira et al, , 2020Rohem Júnior et al, 2020). The information-theoretic approach (I-T) provides the elements for evaluating the quality of fit of models by aiming at their predictive powers (Buckland et al, 1997;Sober, 2002;Burnham and Anderson, 2004;Burnham et al, 2011a).…”

Section: Introductionmentioning

confidence: 99%

The geometry of the lactation curve based on Wood's equation: a two-step prediction

Oliveira

Sant’Anna

Lourenço

et al. 2020

Revista Brasileira De Zootecnia

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-Lactation records from cows of the southwestern Paraná state, Brazil, form the dataset of this study. We applied the information-theoretic approach to evaluate the ability of the nonlinear Wood, Brody, Dijkstra, and Gamma functions to fit to these data by employing a two-step technique based on nonlinear mixed-effects models and generalized linear mixed-effects models. Wood's equation was fitted with the combination of a first-order autoregressive correlation structure and a variance function to account for heteroscedasticity. This version was the best choice to mimic lactation records. Some geometric attributes of Wood's model were deduced, mainly the ascending specific rate from parturition to peak milk yield and the descending specific rate as a measure of the lactation persistence of the milk yield at peak production. Breed and parity order of the cows were assumed as fixed effects to obtain a reliable model fitting process. Regardless of breed, first-order parity cows had greater persistency than their older counterparts, and the greater the ascending rate of milk yield from the parturition to the peak, the sharper the decrease in milk yield post-peak; therefore, the rates (absolute values) of ascending and descending phases correlated positively. Nonetheless, the actual estimated values of the descending phase rates are negative. Wood's equation was flexible enough to mimic either concave-and convex-shaped lactation profiles. The correlations between both peak milk yield and random estimates for β with total milk yield per lactation were positive. However, peak milk yield might not be the only variable used for ranking cows; the total milk yield integrates all information of the lactation profile through the estimated parameters of Wood's equation.

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The transit of external markers throughout the ruminant digestive tract: 2. The estimation of fiber digestibility, ruminoreticular fill, and related biases

Cited by 9 publications

References 67 publications

Standardization of processing parameters and color of gels aiming to replace citric pectin by mesocarp flour or pectin of passion fruit

Standardization of processing parameters and color of gels aiming to replace citric pectin by mesocarp flour or pectin of passion fruit

A two-location trial for selecting corn silage hybrids for the humid tropic: forage and grain yields and in vitro fermentation characteristics

The geometry of the lactation curve based on Wood's equation: a two-step prediction

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