Dissertações em Ciência Animal (Mestrado) - PPGCAN/Castanhal

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2337

O Mestrado em Ciência Animal teve início em 1999 junto à CAPES/MEC e funciona no Programa de Pós-Graduação em Ciência Animal (PPGCAN) do Campus Universitário de Castanhal (CCAST) da Universidade Federal do Pará (UFPA), Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA) e Universidade Federal Rural da Amazônia (UFRA).

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Agora exibindo 1 - 6 de 6

Acesso aberto (Open Access)
Biometria e barimetria da tartaruga da Amazônia, Podocnemis expansa (SCHWEIGGER, 1812), em sistemas comerciais
(Universidade Federal do Pará, 2008) PRINTES, Lanna Daniella dos Santos; ARAÚJO, Cláudio Vieira de; http://lattes.cnpq.br/5049897507837031
The Chelonians represent one of the main bilological resourses of the Amazon region and stand as a important food source for the people that live by the rivers. For that reason, the possibility of commercial rising came forth. Biometries have been made to develop barometric equations in order to determinate the biometry of the amazon turtle and evaluate functions that can be.used for the barometry of the animals at two commercial rinsing fields. Living weight records was used separate heavy and light samples to each site. Because the great variation of the living weight, it was converted to logarithmic scale. To compare two different levels of years and sites, a multivariated variance analysis was performed. A discriminating analysis was adopted by using a canonic variable. The great living weight variation in each year and site reveals that in samples with same age and origin, the animals show great heterogeneity for living weight. The result of the canonic correlation for two rising fields indicates that the living weight can be explained in 86% and 96% when a linear relation is established. Excepting the head width and tail length variables, all others demonstrated highly correlated to the living weight. Therefore, there are a high variation of the living weight among animals created in captivity. The biometries are highly related to the living weight and should be included in studies that seek barometry.
Acesso aberto (Open Access)
Comparação de peso e rendimento de carcaça entre vacas bovinas e bubalinas
(Universidade Federal do Pará, 2008) CRUZ, Sanderley Simões da; ARAÚJO, Cláudio Vieira de; http://lattes.cnpq.br/5049897507837031
Records of alive weight, weight of carcass, weight of primary cuts and income of carcass, proceeding from the Company Scope Ltda, located in the district of Icoaraci, Located in Belém-Pará, had been used to discriminate possible differences between bubaline and bovine, abated females during the year of 2007. The registers of alive weight had been used to separate the sample in light and weighed females, separately in each species, using as threshold the corresponding value the median of the alive weight in each species. Thus, four groups of females, bubalinas and bovine, light and weighed had been composites. For comparison between female vectors of averages of the weights alive, weights hot carcass, left and right hot carcass, weight of the cold carcass, front weight, back weight, weight tip-of-needle and weight leather, between bubaline and bovine, light and weighed, it was used procedures of multivaried inference. The results had disclosed the heterogeneities for the weight of abate of the animals, inside and between species, having a clear-cut standard of ideal weight to it does not abate it. Bubaline had gotten greaters weights for carcass component, when compared with the females of the bovine group. Excepting the weight of the cold carcass and the tip of needle, bubaline of the group weighed, had gotten comparative average greater when to the light group. Inside of the group of bovine females it did not have difference statistics for the weight of carcass cold (P<0,01). It is verified that, in average, bovine had presented greater income, except for the front. The intra-racial Groups had been presented significantly different between itself (P). On the other hand, it was not verified intra-racial differences for the incomes of carcaças hot, cold carcass, front and back pernil.
Acesso aberto (Open Access)
Estimativas de parâmetros genéticos para a produção de leite e idade ao primeiro parto em vacas da raça pardo-suiça utilizando amostrador de Gibbs
(Universidade Federal do Pará, 2008-07-03) BRCKO, Carolina Carvalho; ARAÚJO, Cláudio Vieira de; http://lattes.cnpq.br/5049897507837031
Data from 2.981 lactations of Brown Swiss cows, from 62 herds, calving from 1980 to 2002, were used to check the influence of genetic and not genetic factors, on milk yield and age at first calving. An animal model used included the fixed effect of herds, age-season of calving and grade of cows, random effect of animal and temporary environment. For milk yield, in addition to the fixed effects described above, is also included the linear effect of lactation length and linear and quadratic effects of the age at first calving, as co-variables. Bayesian inference was used to estimate the components of (co) variance through of Gibbs sampling, the size of chain of 1,500,000 rounds and burn in 500,000 rounds. The frequency of sampling was 500 rounds. The estimated average for milk yield and age at first calving were 5347.471849.13 kg and 29,65  4,51 months respectively. The effects of herd, year of calving and lactation length, significantly influenced the production of milk (P <0.01). The age at first calving was influenced by the effects of herd, year of calving (P <0.01), beyond the end of season of calving (P <0.05). The heritability estimates obtained for the milk yield and age at first calving were e 0.23 and 0.18, respectively. The genetic correlation was -0.31. The genetic and phenotypic trend for milk yield was 1.09 kg and 115.34 kg of milk, respectively, for each year of production. For age at first calving, the values of genetic breeding have become negative from 1988, with reduction of approximately 0.05 months of each year and there was a reduction of 32 to 28 months of age at first calving. Daughters of sires with a high genetic value for milk tend to have faster growth or physiological maturity at a very early age, reducing the age at first calving.
Acesso aberto (Open Access)
Estudo da interação genótipo x ambiente sobre a produção de leite em rebanhos da raça Parodo-Suiço no Brasil, utilizando inferência Bayesiana
(Universidade Federal do Pará, 2008-08-04) REZENDE, Gisele do Socorro Amaral; ARAÚJO, Cláudio Vieira de; http://lattes.cnpq.br/5049897507837031
Checks for the presence of heterogeneity of variances on milk production in first lactation of females of Brown Swiss and, impact on genetic evaluation of breeding, using the Bayesian inference using Gibbs sampling we used 2981 records on milk yield and age at calving in first lactation of Holstein Brown Swiss, distributed in 62 herds. The records were from the service of dairy control of the Brazilian Association of Breeders of Brown Swiss cattle, with births occurring between the years 1980 to 2002. Established two classes of phenotypic standard deviation for milk production. Subsequently, the data were analyzed ignoring and considering the classes of standard deviation. The means and standard deviations for milk production in the classes of high and low standard deviation and analysis were generally equal to 5802.02 ± 1929.96, 4844.37 ± 1592.99, 5373.47 ± 1849.13 respectively. The averages for the later components of variance were higher in the high standard deviation. The heritability obtained in the high standard deviation was close to the value observed in the overall analysis and less than the value found in the low phenotypic standard deviation. The genetic correlation for milk production between the classes of standard deviation was equal to 0.48. Pearson and Spearman correlation coefficients and coefficient between breeding values for milk production obtained in the overall analysis, with the values obtained for each class of standard deviation were all higher than 0.80, when considering all breeding. However, refining the sample of players shows that the correlations decrease in magnitude. If there is a greater variability present in flocks in the high standard deviation, and the impact of this heterogeneity of variance on genetic evaluation of breeding is small because the main source of this heterogeneity is due to genetic factors confirming the presence of heterogeneity of variances.
Acesso aberto (Open Access)
Interação genótipo x ambiente para a produção de leite na espécie bubalina utilizando inferência Bayesiana por meio de Amostradores de Gibbs
(Universidade Federal do Pará, 2005-12-21) CARDOSO, Adriana Maciel de Castro; ARAÚJO, Cláudio Vieira de; http://lattes.cnpq.br/5049897507837031
With the objective to verify the existence of the interaction genotype X enviroment, under the form of heterogenity of variances for the milk production in buffaloes and its impact in the genetic evaluation of the animals, using the Bayesiana inference by means of Gibbs Sampler, form used 5,484 registers of referring milk production to the productions of 2.994 females predominantly Murrah, calves of 150 sires, mateds with 1130 matrices, whose birth had occurred between the years of 1974 and 2004. The records had been proceeding from the Programa de Melhoramento Genético de Bubalinos (PROMEBUL) with the addition of records proceeding from the flock of the EMBRAPA Amazônia Oriental - EAO, located in Belém, Pará, State. Class of herd-year of birth had been established and in accordance with the standard deviation of milk production of each class had been classified in class of high and low phenotypic standard deviation. Later the data had been analyzed disrespecting and considering the standard deviations class. The used model used the referring fixed effect to the herd-year class, month of parity and covariable age of the female to the birth and length of the lactation, beyond the random effect of animal, permanent environment and temporary environment effects. For the fixed effect uniform was assumed distribution to priori and for the components of (co)variances, had been assumed distributions priori inverse qui-square and inverted Wishart. The observed averages and shunting line-standard for milk production in the class of high, low standard deviation and in general analysis, had been equal 1870,21±758,78, 1900,50±587,76 and 1885,48±677,98, respectively. The posterior averages for the components of variances had been bigger in the classroom of high standard deviation. The genetic correlation for milk production between standard deviation classes was equal the 0,58. The correlations of Spearman between the breeding values for the milk production obtained in general analysis with the values in the class of high and low standard deviation were 0,94 and 0,93 , respectively, for all the sires. For one it shows of the 10 better sires, the same correlations had been equal 0,94 and 0,47, respectively. Such results disclose presences of heterogenity of variances between herds and this heterogenity of variances is resultant of environmental factors, that can take to a wrong classification of the breeding value to best sires for the production milk.
Acesso aberto (Open Access)
Uso de modelo de regressão aleatória na análise de produção de leite em bubalinos
(Universidade Federal do Pará, 2006-11-29) PEREIRA, Daniela Cristina Portal; ARAÚJO, Cláudio Vieira de; http://lattes.cnpq.br/5049897507837031
Data comprising 1,719 milk yield controls of 357 females predominantly Murrah breed, daughters of 110 sires, whose birth had occurred between the years of 1974 and 2004, obtained from the Programa de Melhoramento Genético de Bubalinos (PROMEBUL) with the addition of records proceeding from the herd of the EMBRAPA Amazônia Oriental - EAO, located in Belém, Pará, State, were used to compare random regression models, for estimating variance components and predicting breeding values of the sires... The data of milk yield were analyzed by different random regression models using the Legendre’s orthogonal polynomials functions of second, third and fourth order . The random regression models included the effects herd-year, month of parity date of the control, regression coefficients for age of females (in order to describe the fixed part of the lactation curve) and random regression coefficients related to the direct genetic effects and the permanent environment. The comparisons among the models were based in the Akaike Criteria Infromation. The random regression model which used the third order Legendre’s polynomials and four class of the environmental effect was the model which better described the additive genetic variation of the milk yield The heritability estimates obtained varied from 0.08 to 0.40.. The genetic correlations between milk yield in ages more near, were close to unit, but in ages less close, the correlations were low. The Pearson and Spearman’s correlations between the predicted breeding values of sires in all situations were close to the unit.

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