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Search Results: 1 - 10 of 20800 matches for " Elias Nunes Martins "
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Aspectos genéticos de curvas de probabilidade de postura em codornas
Rossi, Robson Marcelo;Martins, Elias Nunes;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800012
Abstract: it was evaluated in this work the components of (co)variance and heritability of the parameters of egg production curve in quails in a model of double stages: the first stage is composed of the adjustment of a nonlinear curve, and the second is composed of the assessing of the genetic parameters obtained by the animal model. it was used daily individual records from laying to 90 days, starting with the first egg in the batch, of 308, 374 and 378 birds from three lines. in each strain, there was no difference between the components of (co)variance neither heritability for rations containing different energy levels (2,900 or 2,500 kcal/kg me), indicating that there was no heterogeneity of variance. however, values of genetic correlations were in the order from 0.53 to 0.65 for the α parameter and, for β from 0.28 to 0.30, indicating one existing genotype x environment interaction. estimates of heritability, respectively in the three lines, for the α and β parameters in the high energy diet were 0.21 and 0.50, 0.12 and 0.49, 0.12 and 0.48, and for the low energy diet 0.23 and 0.50, 0.13 and 0.50, 0.10 and 0.47. estimates of the components of (co)variance and heritability were different among the lines, for the two curve parameters. one line showed higher heritability for the α parameter, indicating greater potential for changes by selection for production at the initial stage of laying. considering the β parameter, the three lines have the same potential.
Influência das coletas sistemáticas e parciais na sele??o de codornas por meio de curvas de probabilidade de postura
Rossi, Robson Marcelo;Martins, Elias Nunes;
Revista Brasileira de Zootecnia , 2010, DOI: 10.1590/S1516-35982010000800011
Abstract: this study aimed to verify if the selection is influenced by partial observation of laying instead of observation of total daily posture. on the first state of analyses, through a bayesian model, it was considered as analyzed characteristics the parameters of laying probability curve in a model of random effects with function of logistic connection. on the second stage of the procedure, it was obtained the estimatives of (co)variance components and genetic parameters. it was observed an overestimation of the production mean curve for the total sample in systematic collections (collected once every 14 days, 1 or 2 times every 7 days) and partial (on 15, 30, 45, 60, 75 and 90 consecutive days). for the parameter that represents the beginning of laying (a), the heritability values were 0.54; 0.14; 0.12 and 0.07; and for the parameter that represents the laying evolution (β), they were; 0.36; 0.37; 0.40 and 0.47, respectively, in the systematic and total collections. in partial and total collections, respectively, the values were 0.04; 0.03; 0.06; 0.12; 0.17 and 0.25; 0.25; 0.33; 0.33; 0.32; 0.41 and 0.51. in the systematic collections, as heritability values for the parameters that represent the beginning of laying decreases, the other increases; however, as the sample size increases in partial collections, the values increase for both parameters. within the top 100 animals classified according to a mediated selection index, the correlation among the scores of selected animals in the sub-samples and the total sample is low (from -0.13 to 0.13) indicating that the used selection index is affected.
Early performance of Olea europaea cv. Arbequina, Picual and Frantoio in the southern Atacama Desert
Freddy Mora,Francisco Tapia,Carlos Alberto Scapim,Elias Nunes Martins
Crop Breeding and Applied Biotechnology , 2008,
Abstract: The cultivars Arbequina, Picual and Frantoio of Olea europaea are cultivated in severalMediterranean countries. In 1999, these cultivars were planted at three locations in the region of Coquimbo,an arid, Mediterranean-like area in Chile. A generalized linear modeling approach was used in view of thenon-normal distribution of the agronomic data sets. Fruit yield (harvests of 2002-2003), precocity (2002) andtree survival (after four growing seasons) differed significantly between the cultivars. Arbequina and Picualhad a positive effect on the yield. Picual was the earliest cultivar at two sites. The survival rate of Frantoio washigh at the three sites (90-100%), as opposed to Picual (56-83%). The approach of Generalized Linear Modelswas particularly useful where the assumption of normality was not satisfied. The selection of cultivars ispromising in this arid region of Chile, while the success will depend on the selection of well-adapted genotypesto a particular location.
Evaluación genética de clones de olivo en el desierto de Atacama, Chile
Mora, Freddy;Tapia, Francisco;Ibacache, Antonio;Nunes-Martins, Elias;Scapim, Carlos Alberto;
Agrociencia , 2008,
Abstract: the olive (olea europaea l.) is an economically important species for countries that have mediterranean climate and has been an appropriate, useful alternative for intensive farming systems in the arid zones of chile. for this reason, the objective of this study was to determine the components of variance, broad-sense heritability, and prediction of genetic values using the bayesian techniques on twenty-eight olive clones in the southern part of the atacama desert. the algorithm of independent chains was used to estimate parameter distributions a posteriori. the field experiment was set up in 2000, and during six years six quantitative traits were monitored in different periods. estimations of heritability and associated credibility intervals (parentheses) were h2=0.50 (0.38-0.61), 0.50 (0.38-0.61), 0.81 (0.74-0.86), 0.53 (0.42-0.64), 0.26 (0.14-0.40), and 0.44 (0.17-0.65) for fruit production (2006), total fruit production (2003-2006), area of trunk cross section (2006), tree productivity (2006), alternation of production (2003-2006), and precocity (2003). genetic advance by direct selection varied from 16 to 55% with a selection intensity of 28.6%. pearson correlations, calculated between genetic values of alternation of production and production traits, were negative and significant. selection of olive clones for precocity would not generate any significant effect on production traits. moderate heritability for fruit production, alternation of production, and precocity suggest a positive response to the selection of olive clones under the environmental conditions of the southern part of the atacama desert.
Lysine and metabolyzable energy requirements of lactating sows for subsequent reproductive performance
Santos, José Maurício Gon?alves dos;Moreira, Ivan;Martins, Elias Nunes;
Brazilian Archives of Biology and Technology , 2006, DOI: 10.1590/S1516-89132006000500006
Abstract: the requirements of lactating sows for total lysine and metabolyzable energy (me) to support subsequent reproduction performance were evaluated. one hundred and twenty sows were used. the treatments were constituted of eight diets (factorial arrangement of four levels of total lysine: 0.75, 0.90, 1.05 and 1.20%, and two levels of me: 3,250 and 3,400 kcal me/kg). there was interaction between lysine and me on the plasma urea nitrogen (pun), with linear decrease effect on level of 3,250 kcal me/kg, and quadratic effect on level of 3,400 kcal me/kg, with the lowest level of pun with 1.06% lysine. the reproductive performance in the subsequent farrowing was not affected by the lysine levels and me, hence, neither the total born nor the born alive differed among the treatments. there was no convincing information to support that the requirements of total lysine and me for lactating sows were higher than 0.75% and 3,250 kcal/kg.
Variabilidad en el florecimiento de procedencias de Eucalyptus cladocalyx en la Región de Coquimbo
Mora,Freddy; Perret,Sandra; Scapim,Carlos Alberto; Nunes Martins,Elias; Molina,María Paz;
Ciencia e investigación agraria , 2007, DOI: 10.4067/S0718-16202007000200006
Abstract: this work aimed to study the variability in flowering of five populations of eucalyptus cladocalyx established in the administrative region of coquimbo, northern chile. flowering was recorded as a binary response trait in 30-month-old trees. then, at first, a generalized linear model was fitted for analyzing provenance effect. subsequently, genetic variability was studied within the best provenance by bayesian inference via gibbs sampling. initially, two sites were considered: caracas and tunga norte, in the littoral and interior area of the choapa province, respectively. in the littoral area, only 1.3% of the trees evidenced flowering events, while in tunga norte, this value was 23.43%. for this reason, only interior site was considered. the provenance effect was significant (p < 0.01), with cowell (codified fdi-20411) being the population that evidenced a relative better flowering response, although it not was different of the trees from national plantations (fdi-illapel). however, trees from a local population evidenced a high variability, having a mean response similar to other provenances. the flowering trait analyzed within the cowell population, the selected provenance, was shown to be highly heritable (h2 = 52.3%). predicted genetic gain when considering two different breeding strategies varied from 36 to 40%. according to these results, it is possible that farmers can recover establishment costs of e. cladocalyx plantations as soon as possible whenever the selected trees are used for apicultural aims
Análise econ?mica da produ??o de carne de cordeiros sob dois sistemas de termina??o: pastagem e confinamento
Macedo, Francisco de Assis Fonseca de;Siqueira, Edson Ramos de;Martins, Elias Nunes;
Ciência Rural , 2000, DOI: 10.1590/S0103-84782000000400020
Abstract: this experiment was carried out to study costs and economical return of carcass lamb (kg) production in two finishing systems. the systems compared were, a grazing system based on "coast cross" pasture (cynodon dactylon) with the following genotypes: 13 corriedale (c). 14 bergamacia x corriedale (bc), and 9 hampshire down x corriedale {hc}, and a dry-lot system with the following crossbreeds : 10 c, 11 bc, and 8 hc. in the dry-lot system the lambs were fed with a total mix ration, containing the some leveis ofcrude protein and total digestible nutrients of the pasture. the stock rate in the pasture was 20 lambs/ha. in the dry-lot was used an área of 0.5m2/lamb and the lambs were housed in a suspenso and siated floor facitity. the total costs in the graang system was us$ 1985.33, and in the dry-lot system was us$ 2432.00. the total incarne for the grazing system was us$ 3072.42, and for dry-lot system was us$ 3748.35. the production cost/carcass kg was very similar for both systems (us$ 1.92, dry-lot; us$ 1.88, pasture). the economical retum was us$ 229.28 higher for dry-lot (us$ 1316.36) m relation to pasture (us$ 1087.08). these results show that the production ofiamb meat in dry-lot systems is viable.
Exigências de lisina e energia metabolizável para marr?s de reprodu??o
Santos, José Maurício Gon?alves dos;Moreira, Ivan;Martins, Elias Nunes;
Revista Brasileira de Zootecnia , 2005, DOI: 10.1590/S1516-35982005000700016
Abstract: one experiment was carried out to determine the lysine (lys) and metabolyzable energy (me) levels for breeding gilts. one hundred and eight seghers? gilts (large-white x landrace/large-white) were alloted to a complete randomized design with a 3x3 factorial design, three levels of lys (0.55, 0.75 and 0.95%) and three levels of me (3,100, 3,250, and 3,400 kcal me/kg). the treatments were the same from the beginning of trial (housing) to the slaughter (30 days of gestation). there was only effect of me on the reproductive performance, without effect of lys or the me x lis interaction. the number of corpora lutea increased linearly with the highest level of me and weigh at artificial insemination (ai-weight). likewise, the numbers of total and live embryos increased linearly with the highest level of me. the lowest concentration of plasma urea nitrogen was obtained with 0.55% of lys and 3,400 kcal me/kg. the weight and back fat thickness at ai, plasma glucose, progesterone, and insulin were not influenced by the treatments. the requirement for total lysine for breeding gilts is not higher than 0.55%. the minimum energy recommendation is of 3,400 kcal me/kg.
Avalia??o nutricional da silagem de gr?os úmidos de sorgo de baixo ou de alto conteúdo de tanino para coelhos em crescimento
Furlan, Antonio Claudio;Scapinello, Cláudio;Moreira, Ivan;Martins, Elias Nunes;
Revista Brasileira de Zootecnia , 2006, DOI: 10.1590/S1516-35982006000300020
Abstract: two experiments were carried out to determine the nutritive value and to evaluate the performance of growing rabbits fed on isoenergetic diets containing high moisture sorghum silage grain with low or high tannin levels. in the digestibility assay (experiment 1), the nutritive values of silages were determined with 30 new zealand white rabbits, 15 males and 15 females, 55 days old, allotted in a completely randomized design, with 3 treatments and 10 replications. in each treatment the each sorghum silage replaced 30% basal diet. values of digestible dry matter, organic matter, protein, starch and energy of high moisture sorghum silage grain with low or high tannin content were, respectively, on a dry matter basis, 62.25 and 62.61%; 91.99 and 89.05%; 9.50 and 7.70%; 66.22 and 65.76% and, 4,285 and 4,116 kcal/kg. in performance trial diets containing increasing levels of high moisture sorghum silage grain with low or high tannin content (0, 33, 66 and 100%) in replacement to corn were used. eighty four new zealand white rabbits (42 males and 42 females), 35 days old, were alloted in a completely randomized design, with 7 treatments and 12 replications each. there was no effect on performance, carcass and cost of ration per kilogram live weigh gain of growing rabbits. high moisture sorghum silage grain with low or high tannin content has good nutritive value and may totally replace corn in diets of growing rabbits.
Características da carca?a de cordeiros alimentados com dietas contendo gr?os de milho conservados em diferentes formas
Reis, Wagner dos;Jobim, Clóves Cabreira;Macedo, Francisco A. F.;Martins, Elias Nunes;Cecato, Ulysses;
Revista Brasileira de Zootecnia , 2001, DOI: 10.1590/S1516-35982001000500026
Abstract: the objective of this study was to evaluate the use of corn grains in different forms (corn dry grain, high moisture corn silage, moisturized corn silage) in the diet of confined lambs, and its possible effects on the qualitative and quantitative characteristics of the carcass. twenty male bergamacia x corriedade lambs were used. the animals were confined and fed ad libitum, assigned to five treatments consisted of dry corn: high moisture corn silage or moisturized corn silage (0:100, 50:50, 100:0). there was not effect of the treatments on the main carcass characteristics. the average true yield of carcass was 51.5%, while the yield of commercial carcass was 42.4%. differences were not observed between the variable body condition and conformation of the carcass, in function of the treatments. the variables fat covering, fat color and fat thickness were similar. the forms of the corn grains used in the feeding of the lambs did not affect the qualitative and quantitative characteristics of the carcass.
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