Análise Bayesiana da curva de crescimento de cordeiros da raça Santa Inês

Guedes, Marlon H. Paiva; Muniz, Joel Augusto; Silva, F.F.; Aquino, Luiz Henrique de

doi:10.1590/s0102-09352005000300024

Cited by 8 publications

(6 citation statements)

References 3 publications

(7 reference statements)

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“…Although Traldi (1990) and Sasa (2006) studied the manifestation of rut in sheep and despite the fact that the present study used lambs, it can be inferred that Sana Inês ewes were at the age and weight for puberty, according to the growth curve presented by Guedes et al (2005), and these characteristics are similar in the Texel breed (Guimarães Filho et al, 2009). Ile de France ewes presented 66 kg and were at 29 months of age, which is enough for them to be at puberty according to Jainudeen et al (2000).…”

Section: Resultsmentioning

confidence: 72%

Frequency of estrus in Santa Inês, Texel and Ile de France ewes in the northwest of Paraná State, Brazil

et al. 2013

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-The incidence of estrus in nulliparous Santa Inês (n = 16), Texel (n = 16) and Ile de France (n = 15) ewes fed two levels of crude protein (CP, 12 or 16%) was monitored from July 2005 to December 2006, and seasonality in the Santa Inês breed in the south of Brazil was characterized. The solar radiation data were recorded daily, and samples of blood were collected biweekly for determination of the plasma concentration of progesterone in Santa Inês lambs at, on average, 11±1 months of age. The female Santa Inês lambs, in the experimental period, stayed among teaser rams with a powdered-dye-ink mixture placed on their chest to mark the females that accepted to be mounted. Santa Inês ewes did not manifest estrus in the first fortnight of November and in December 2005, nor in the last fortnight of December 2006. Estrus activity was not observed on any of the three breeds in October 2006. Breeds differed at the level of 12% CP. Santa Inês and Ile de France females did not differ as for the probability estrus manifestation and both presented higher probabilities then Texel. When the effect of 12 or 16% CP on each breed was evaluated separately, it was verified that levels of 12 or 16% of crude protein did not change the probability of estrus manifestation in any of the studied breeds. The concentration of plasma progesterone in Santa Inês ewes during the spring of 2005 and 2006 indicated that there is difference between 12% CP (0.68±1.32 ng/mL) and 16% CP (1.28±1.99 ng/mL) and between the years 2005 (0.39±0.78 ng/mL) and 2006 (1.47±2.08 ng/mL), demonstrating the anestrous seasonality of Santa Inês in South Brazil.

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Section: Resultsmentioning

confidence: 72%

Frequency of estrus in Santa Inês, Texel and Ile de France ewes in the northwest of Paraná State, Brazil

et al. 2013

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“…To estimate the (co)variance components and the genetic parameters using Bayesian inference, the softwares GIBBSF90 and POSTGIBBSF90 (Misztal et al, 2014) were used. In the Bayesian inference context, the a priori information about the parameters are used in association with sampling data through the similarity function, thus generating a joint a posteriori (Guedes et al, 2005;Mello et al, 2006). The complete conditional distribution of the parameters were obtained from the joint a posteriori densities, in other words from the density of the parameters, considering the initial observations and information.…”

Section: Methodsmentioning

confidence: 99%

<b>Influence of genotype-environment interaction on the classification of Nellore bulls in Southern Brazil

Bresolin

Everling

Rorato

et al. 2015

Acta Sci. Anim. Sci.

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The aim of this study was to assess the occurrence of genotype-environment interaction, as well as its effects on the magnitude of genetic parameters and the classification of Nellore breeding bulls for the trait adjusted weight at 205 days (W205) on Southern Brazil. The components of (co)variance were estimated by Bayesian inference, using a linear-linear animal model in a bi-trait analysis. The proposed model for the analyses considers as random the direct additive genetic and maternal effects and residual effects, and as fixed effects the contemporary groups, sex, season of birth and weighing, and calving age as covariable (linear and quadratic effects). The a posteriori mean estimates of the direct heritabilities for W205 in the three States varied from 0.24 in Paraná (PR) to 0.34 in Santa Catarina (SC). The estimates of maternal heritability varied from 0.23 in SC and Rio Grande do Sul (RS) to 0.28 in PR. The a posteriori mean distributions of the genetic correlation varied from 0.52 between SC and RS, to 0.84 between PR and RS, suggesting that the best breeding bulls in SC are not the same as in RS.

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“…Some researchers have studied those models in goats (SOUSA et al, 2011;DO Ó et al, 2012) and in sheep (SOUZA et al, 2011;TEIXEIRA NETO et al, 2016), which requires some criteria to select the most competitive ones (GUEDES et al, 2005;SARMENTO et al, 2006b).…”

Section: Introductionmentioning

confidence: 99%

Method to generate growth and degrowth models obtained from differential equations applied to agrarian sciences

Santos

Moreira

Brito

et al. 2018

SCA

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This study aims to propose a method to generate growth and degrowth models using differential equations as well as to present a model based on the method proposed, compare it with the classic linear mathematical models Logistic, Von Bertalanffy, Brody, Gompertz, and Richards, and identify the one that best represents the mean growth curve. To that end, data on Undefined Breed (UB) goats and Santa Inês sheep from the works of Cavalcante et al. (2013) and Sarmento et al. (2006a), respectively, were used. Goodness-of-fit was measured using residual mean squares (RMS), Akaike information criterion (AIC), Bayesian information criterion (BIC), mean absolute deviation (MAD), and adjusted coefficient of determination . The models’ parameters (?, weight at adulthood; ?, an integration constant; ?, shape parameter with no biological interpretation; k, maturation rate; and m, inflection point) were estimated by the least squares method using Levenberg-Marquardt algorithm on the software IBM SPSS Statistics 1.0. It was observed that the proposed model was superior to the others to study the growth curves of goats and sheep according to the methodology and conditions under which the present study was carried out.

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Análise Bayesiana da curva de crescimento de cordeiros da raça Santa Inês

Cited by 8 publications

References 3 publications

Frequency of estrus in Santa Inês, Texel and Ile de France ewes in the northwest of Paraná State, Brazil

Frequency of estrus in Santa Inês, Texel and Ile de France ewes in the northwest of Paraná State, Brazil

<b>Influence of genotype-environment interaction on the classification of Nellore bulls in Southern Brazil

Method to generate growth and degrowth models obtained from differential equations applied to agrarian sciences

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