oalib

Publish in OALib Journal

ISSN: 2333-9721

APC: Only $99

Submit

Any time

2019 ( 137 )

2018 ( 311 )

2017 ( 332 )

2016 ( 352 )

Custom range...

Search Results: 1 - 10 of 178614 matches for " Wandrick Hauus de Souza "
All listed articles are free for downloading (OA Articles)
Page 1 /178614
Display every page Item
Genetic aspects of the growth curve characteristics in Anglo-Nubian goats Aspectos genéticos da curva de crescimento de caprinos Anglo-Nubiano
José Ernandes Rufino de Sousa,José Lindenberg Rocha Sarmento,Wandrick Hauus de Souza,Maria do Socorro Medeiros de Souza
Revista Brasileira de Saúde e Produ??o Animal , 2011,
Abstract: Data of Anglo-Nubian goats from experimental herds of Empresa Estadual de Pesquisa Agropecuária da Paraíba (EMEPA-PB), recorded between 1980 and 2005 were used, with the objective to study the adjustment of Brody, Gompertz, Logístico, Richards and Von Bertalanffy functions on the growth curve and to estimate genetic parameters for the traits obtained from best fitting function. Functions were fitted using NLIN procedure of Statistical Analysis System software (SAS), by GAUSS method. The best fitting was obtained using the Brody function. The respective values of mature weight and maturation rate estimated by Brody function were 28.22kg and 0.0054/day. The Brody function was used to estimate genetic parameters and the (co)variance components for traits of economic importance using the Derivative Free Restricted Maximum Likelihood method, using the WOMBAT software. The estimates direct heritability of mature weight and maturation rate were, respectively, 0.10, and 0.12, and the direct heritability of other weights recorded ranged from 0.10 to 0.28. The results observed in this study indicates small genetic progress using individual selection. Foram utilizados dados de caprinos da ra a Anglo-Nubiana controlados entre os anos de 1980 e 2005 na Empresa Estadual de Pesquisa Agropecuária da Paraíba – EMEPA com o objetivo de estudar o ajuste das fun es de Brody, Gompertz, Logístico, Richards e Von Bertalanffy sobre a curva de crescimento e estimar parametros genéticos para características obtidas a partir da fun o de melhor ajuste. Para o ajuste das curvas, foi utilizado o procedimento NLIN do software Statistical Analysis System (SAS), por meio do método de GAUSS. A curva de Brody foi a que promoveu melhor ajuste. Os valores do peso adulto e da taxa de matura o estimados pela fun o de Brody foram de 28,22kg e 0.0054/dia, respectivamente. A fun o de Brody foi usada para estimar parametros genéticos e componentes de (co)variancia para características de importancia econ mica pelo método da Máxima Verossimilhan a Restrita Livre de Derivadas (DFREML), com utiliza o do software WOMBAT. As estimativas de herdabilidade direta do peso à maturidade e da taxa de matura o foram, respectivamente, 0.10 e 0.12, e a herdabilidade direta dos outros pesos variaram de 0.10 a 0.28. Os resultados obtidos neste estudo indicam que o progresso genético esperado por meio de sele o massal é pequeno.
Homogeneidade e heterogeneidade de variancia residual em modelos de regress?o aleatória sobre o crescimento de caprinos Anglo-Nubianos
Sousa, José Ernandes Rufino de;Silva, Martinho de Almeida e;Sarmento, José Lindenberg Rocha;Sousa, Wandrick Hauus de;Souza, Maria do Socorro Medeiros de;Fridrich, Angela Beatriz;
Pesquisa Agropecuária Brasileira , 2008, DOI: 10.1590/S0100-204X2008001200012
Abstract: the objective of this work was to compare random regression models with different structures of residual variances, in the estimate of covariance components and genetic parameters for growth traits in goats. regression functions using legendre orthogonal polynomials of the fourth order were used for modeling animal growth trajectory, and polynomial of third order for modeling direct and maternal additive genetic effects, and permanent environmental effect. different residual variance structures were considered using alternatively step functions (from one to seven different classes of residual variances) or variance functions using ordinary and legendre polynomials, with orders of fit from the first to fourth order. models were compared by likelihood ratio test, akaike's information criterion and schwarz's bayesian criterion. models including residual variance functions showed better results than those including classes of variance. the ordinary polynomial of third order showed better results than the other models. genetic parameters are affected by different residual variance structures in the models, however, genetic parameters estimates using four classes of residual variance, ordinary polynomial and legendre polynomial of third order are similar.
Efeito materno sobre a curva de crescimento de ovinos Santa Inês por meio de modelos de regress o aleatória
José Lindenberg Rocha Sarmento,Robledo de Almeida Torres,Wandrick Hauus de Sousa,Raimundo Nonato Braga L?bo
Comunicata Scientiae , 2011,
Abstract: Data set of 17.767 weight records of 4.210 Santa Inês lambs were used aiming to evaluate theimportance of the inclusion of the maternal effect in the model to estimate components of (Co)variance and resulting genetic parameters for the growth curve through random regression models.The fixed and random regressions were fitted using Legendre Polynomials of order three, being fit fourmodels that differed in relation to the inclusion of the additive genetic and permanent environmentalmaternal effects. Considerable increase was observed in Log L and decrease in the criteria AIC andBIC when the maternal effect was included (genetic or permanent environmental), evidencing itsimportance. The maternal genetic effect explained larger proportion of the phenotypic variancethan the maternal permanent environmental along the growth curve. The direct additive geneticvariance was inflated by maternal effect, when this last one was not considered in the analysismodel, reflecting the same behavior in the heritabilities. The maternal permanent environmentaleffect contributed to maternal variance, as well as, it inflated maternal genetic variance, whenit was not considered in the model. Similar behavior was verified with maternal heritability. Thecorrelation estimated for the four models hardly differed in function of maternal effect. The maternaleffect should be considered in the genetic studies of the growth curve of Santa Inês sheep.
Modelos de regress?o aleatória na avalia??o genética do crescimento de ovinos da ra?a Santa Inês
Sarmento, José Lindenberg Rocha;Torres, Robledo de Almeida;L?bo, Raimundo Nonato Braga;Albuquerque, Lucia Galv?o de;Sousa, Wandrick Hauus de;Sousa, José Ernandes Rufino de;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800014
Abstract: it was used 17,767 weight records of 4,210 santa inês breed lambs aiming to compare random regression models with different structures to model the residual variance in genetic studies of the growth curve. the fixed effects included in the analysis were contemporary group and age of the ewe at lambing. fixed and random regressions were fitted through legendry polynomials of orders 4 and 3, respectively. the residual variance was fitted by heterogeneous classes and by functions of variances employing ordinary polynomials and legendry polynomials of the orders 2 to 8. the model considering homogeneity of residual variances was inadequate. accordingly to the used criteria, the residual variance containing seven heterogeneous classes provided the best fit, although a more parsimonious one, with five classes, could be used without losses on the quality of variance fit on the data. the fit of functions of variances with any order was better than that obtained through classes. the ordinary polynomial of order 6 provided the best fit among the tested structures. the modeling of the residue interfered on the estimative of the variances and genetic parameters. in addition to changes in the classification of the reproducers, the magnitude of the predicted genetic values shows significant variations, accordingly to the fitting of the used residual variance.
Determina??o dos parametros fisiológicos e gradiente térmico de diferentes grupos genéticos de caprinos no semi-árido
Souza, Expedito Danusio de;Souza, Bonifácio Benício de;Souza, Wandrick Haus de;Cezar, Marcílio Fontes;Santos, José Romulo Soares dos;Tavares, Gustavo de Paula;
Ciência e Agrotecnologia , 2005, DOI: 10.1590/S1413-70542005000100022
Abstract: this work was to evaluate the adaptation of different genetic groups of goats through the physiologic , the rectal temperature, heart frequency and breathing frequency of the thermal gradient parameters under the conditions of the semi-arid region. thirty non-castred goats were used, being six animals of each genetic group: boer ? + ? wdr (without defined race), ? anglo-nubiana + ? wdr, ? savana + ? wdr, ? kalarari + ? wdr and ? moxotó + ? wdr, with medium weight of 25.17kg, were assigned in a randomized in a split plot design in time. the feeding was done by a confinement ration the bulky. the meteorological maximum and minimum temperature, temperature of the dry bulb and humid bulb, temperature of the black globe in the shadow and relative humidity of the air were registred. the sockets of the physiologic parameters and of the environmental variables were done at 9:00h and the 15:00h. in the shift of the afternoon the breathing frequency was significantly (p <0.05) higher than the one of the shift of the morning, probably in function of the largest room temperature observed in this schedule. the data shown any significant (p>0.05) effect of genetic group also any effect of shift on the physiologic parameters such as rectal temperature and heart frequency. there was significant effect (p <0.05) for the gradient thermal rectal , superficial temperature and temperature of the atmosphere. there was significant effect (p <0,05), for variation among shift for the gradient on thermal rectal , superficial temperature and temperature of the atmosphere. the non-castred goatss from different genetic groups shown capacity to maintain the homeotermy.
Temperatura superficial e índice de tolerancia ao calor de caprinos de diferentes grupos raciais no semi-árido nordestino
Souza, Bonifácio Benicio de;Souza, Expedito Danusio de;Cezar, Marcílio Fontes;Souza, Wandrick Haus de;Santos, José Romulo Soares dos;Benicio, Talícia Maria Alves;
Ciência e Agrotecnologia , 2008, DOI: 10.1590/S1413-70542008000100039
Abstract: one aimed with this work to determine the superficial temperature and the index of tolerance to the heat of goats (f1) resultants of crossings among these breed, boer, savanna, kalahari, anglo nubiana and moxotó, with goat in no definite breed of the northeast area. thirty goats were used, with medium age of six months and medium weight of 25,17kg being six of each genetic group: ?boer + ?srd (bs), ?anglo-nubiana + ?srd (ans), ?savana + ?srd (ss), ?kalarari + ?srd (ks) and ?moxotó + ?srd (bad), maintained in confinement regime. the studied parameters were the superficial temperature and the index of tolerance to the heat (itc). one verified that the genetic groups presented significant difference for the superficial temperature, though itc went similar for all. so, the use of these genetic groups to increase the goats productivity in the semi-arid can be advised.
Avalia??o de parametros fisiológicos de ovinos Dorper, Santa Inês e seus mesti?os perante condi??es climáticas do trópico semi-árido nordestino
Cezar, Marcilio Fontes;Souza, Bonifácio Benício de;Souza, Wandrick Hauss de;Pimenta Filho, Edgard Cavalcanti;Tavares, Gustavo de Paula;Medeiros, Gildenor Xavier;
Ciência e Agrotecnologia , 2004, DOI: 10.1590/S1413-70542004000300018
Abstract: the goal of this work was to evaluate physiological parameters (respiratory and cardiac frequencies, rumen movement and rectal temperature) in dorper, santa inês and dorper x santa inês crossbreed (f1) sheep submitted to typical weather conditions (tropic semi-arid) of brazilian northwest. were used 48 sheep, 16 animals from each of the three genetic groups (dorper, santa inês and crossbreed), among them 8 were male and 8 were female. the experimental design was completely randomized in a 3 x 2 x 2 factorial scheme (3 genetic groups, 2 genders and 2 collecting shift). from the three variations sources considered, gender, genotype and shift, the last had a significant (p<0.05) effect on all physiological parameters evaluated without interaction with gender (p<0.05) in relation to respiratory and cardiac frequencies. it was concluded that the shift was the factor that had the higher influence on the sheep's answer to temperature environment, independently of genotype and gender. evening shift conducted animals to a dangerous situation, in terms of thermal uncomfortable and heat stress. considering the cardiac frequency of f1 males and doper female and the respiratory frequency of dorper males and females and of f1 males, they were more stressed. it demonstrated the reduced capacity of the exotic genotype and their crossbreed for adaptation.
Respostas fisiológicas e gradientes térmicos de ovinos das ra?as Santa Inês, morada nova e de seus cruzamentos com a ra?a Dorper às condi??es do semi-árido nordestino
Santos, Jose Romulo Soares dos;Souza, Bonifácio Benício de;Souza, Wandrick Hauss de;Cezar, Marcilio Fontes;Tavares, Gustavo de Paula;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000500025
Abstract: this work was conducted in the state company of agricultural research of paraíba s.a. (emepa-pb), in the district of soledade, with the objective of evaluating the physiologic parameters (breathing frequency, heart frequency and rectal temperature) and thermal variation (between rectal and skin temperature and between skin and air temperature) of santa inês and morada nova sheep and their crossbreeds f1 with the dorper sheep, under to the climatic conditions of the semi-arid northeastern. thirty sheep were used, of five different genotypes, distributed in a random customized design, in a factorial outline 5 x 2; five genotypes (santa inês, morada nova, 1/2santa inês + 1/2dorper, 1/2santa inês + 1/2morada nova, 1/2morada nova + 1/2dorper) vs two shifts (morning and afternoon), with 6 repetitions. interaction was detected among variables genotype and shift. there was significant effect (p<0,05) among genotypes only on the variables heart frequency and thermal variation between skin and air temperature, in the shift of the morning. the shift influenced significantly (p <0,05) all the analyzed physiologic parameters. it is concluded that santa inês, and morada nova sheep and their crossbreeds with the dorper sheep showed to have high adaptability in the semi-arid conditions of brazil.
Estimates of covariance functions for growth of Anglo-Nubian goats
Sousa, José Ernandes Rufino de;Silva, Martinho de Almeida e;Sarmento, José Lindenberg Rocha;Sousa, Wandrick Hauss de;Souza, Maria do Socorro Medeiros de;Ferreira, Isabel Cristina;
Revista Brasileira de Zootecnia , 2011, DOI: 10.1590/S1516-35982011000100015
Abstract: it was used 4,313 weight records from birth to 196 days of age from 946 anglo-nubiana breed goats, progenies from 43 sires and 279 dams, controlled in the period from 1980 to 2005, with the objective of estimating covariance functions and genetic parameters of animals by using random regression models. it was evaluated 12 random regression models, with degrees ranging from 1 to 7 for direct additive genetic and maternal and animal permanent environment effect and residual variance adjusted by using animal age ordinary polynomial of third order. models were compared by using likelihood ratio test and by bayesian information criterion of schwarz and akaike information criterion. the model selected based on bayesian information criterion was the one that considered the maternal and direct additive genetic effect adjusted by a quadratic polynomial and the animal permanent environmental effect adjusted by a cubic polynomial (m334). heritability estimates for direct effect were lower in the beginning and at the end of the studied period and maternal heritability estimates were higher at 196 days of age in comparison to the other growth phases. genetic correlation ranged from moderate to high and they decreased as the distance between ages increased. higher efficiency in selection for weight can be obtained by considering weights close to weaning, which is a period when the highest estimates of genetic variance and heritability are obtained.
Qualidade do queijo de leite de cabra tipo Coalho condimentado com cumaru (Amburana cearensis A.C. Smith)
Souza, Evandro Leite de;Costa, Ana Caroliny Vieira da;Garcia, Estefania Fernandes;Oliveira, Maria Elieidy Gomes de;Souza, Wandrick Hauss de;Queiroga, Rita de Cássia Ramos do Egypto;
Brazilian Journal of Food Technology , 2011, DOI: 10.4260/BJFT2011140300026
Abstract: this study aimed to carry out the physicochemical, microbiological and sensory characterization of coalho-like goat's milk cheese with added coumarou (amburana cearensis a.c. smith), manufactured in the cariri region, paraíba state, brazil. the average values obtained for moisture, protein, fat, fat in the dry extract, ash and acidity as lactic acid were 46.5; 23.9; 25.3; 47.5; 3.8 and 0.09%, respectively. all the samples analyzed presented total coliform counts > 2.4 x 103 mpn.g-1, while the faecal coliforms ranged between 0.3 x 101 - > 2.0 x 103 mpn.g-1. salmonella was not found in any of the samples. the mesophilic, fungal and coagulase-positive staphylococcal counts were between 3.7 x 104-5.6 x 108; 4.6 x 102-5.2 x 109; and > 101-8.0 x 105 cfu.g-1, respectively. the sensory tests showed good acceptance of the product assessed and satisfactory results for purchasing intent. the good acceptance of the cheeses evaluated showed the potential for increased consumption. however, the results of the microbiological analyses showed the need for better monitoring of the steps involved in its processing, in order to obtain a product with better microbiological quality.
Page 1 /178614
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.