Time filter
Source Type

Sarmento J.L.R.,UFPI | de Almeida Torres R.,Federal University of Viçosa | Lobo R.N.B.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária | de Albuquerque L.G.,São Paulo State University | And 2 more authors.
Revista Brasileira de Zootecnia | Year: 2010

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. © 2010 Sociedade Brasileira de Zootecnia.

Sousa J.E.R.,CPCE UFPI | Silva M.A.,Federal University of Minas Gerais | Sarmento J.L.R.,CPCE UFPI | Sousa W.H.,EMEPA PB | Souza M.S.M.,CPCE UFPI
Archivos de Zootecnia | Year: 2010

Polynomial functions for modeling growth curves of 946 Anglo-Nubiano goats, born from 1980 to 2005, and their effect on genetic parameter estimates were evaluated. Growth trajectories were fitted by fixed regression of weights on orthogonal polynomial of age, considering polynomials from second to seventh orders. For fixed regression, polynomial models were compared using the following criteria: mean square errors, absolute average residual error, square percent bias and goodness of fit. Akaike's information criterion, Bayesian information criterion and likelihood ratio test criteria were used to evaluate the effect of different polynomial order of fixed regression on genetic parameters estimates. An expressive improvement was found using higher order polynomials and those of fourth order were sufficient for modeling the average growth curve of goats. No influences on genetic parameter estimates were observed adopting higher than cubic order polynomial functions. The direct heritability showed an increasing pattern until 84 th day of age, while the maternal one had a constant pattern for the whole period. Polynomial functions are efficient tools for modeling growth curve and polynomials of at least fourth order should be used for modeling the average growth curve of goat in random regression models.

Nobrega G.H.,Federal University of Campina Grande | Cezar M.F.,Federal University of Campina Grande | Sousa O.B.,Federal University of Campina Grande | Pereira Filho J.M.,Federal University of Campina Grande | And 5 more authors.
Arquivo Brasileiro de Medicina Veterinaria e Zootecnia | Year: 2014

The aim was evaluate the effect of diet for compensatory growth on performance, empty weight body, weight of abiotic components, weight and proportion of TGI and morphology of the rumen and small intestine of lambs feedlot. Thus, we used 40 Santa Inês non castrated male lambs, housed in individual pens. The containment was divided into two distinct periods of 42 days: a food restriction, with four treatments (0, 20, 40 and 60% restriction), and a feedback loop, where all the animals were fed again without restriction. At the end of the period of confinement they were slaughtered to measure the weight of TGI, weight and abiotic components for obtaining fragments of the rumen and small intestine, which were subsequently used for the preparation of histological slides used to evaluate the morphology of the papillae rumen and the intestinal villi and crypts (μm). The variables for performance, slaughter weight, empty body weight and weight of TGI decreased as they increased the level of prior restraint. The width of the rumen papillae decreased ranging from 555.7 to 470.3μm; the area of increased intestinal villi ranged from 81042.8 to 92033.7μm2. The diet for compensatory gain decreases weight gain, slaughter weight, empty body weight and the weight of the gastrointestinal tract of Santa Ines lambs, besides affecting the morphology of rumen papillae and villi of the small intestine.

Furtado D.A.,Federal University of Campina Grande | Peixoto A.P.,EMATER PB | Regis J.E.F.,EMEPA PB | do Nascimento J.W.B.,Federal University of Campina Grande | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2012

performance and nutrient intake by Gir and Guzera young bulls. The work was conducted at the Experimental Station of Alagoinha/EMEPA-PB in Alagoinha town in 'Agreste' region of Paraiba state, Brazil, using 16 young bulls of Sind and Guzera breeds (8 animals of each breed), with a mean 31.5 ± 1.5 months of age, kept under confined conditions. The statistical design used was randomized blocks with eight replications in split plot with breed in the main plot and time (6, 12 and 16 h) as subplots. Rectal temperature, respiratory rate and surface temperature of the animals remained within the normal range for the bovine species. There was no negative influence on food intake and the animals had weight gain higher than expected, demonstrating that they are adapted to the conditions of northeastern Brazil, since there were no changes in their physiological parameters considered within the normal range and still showed excellent growth performance and nutrient intake.

de Moraes A.M.,EMEPA PB | Almeida F.A.C.,Federal University of Campina Grande | Bruno R.L.A.,Federal University of Paraiba | Filho J.C.,EMEPA PB | And 2 more authors.
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2010

This work aimed to develop a micropropagation protocol of pineapple cv. Emepa 1. The cv. Emepa 1 axillary gems used were disinfested and inoculated in half MS solid with 5.8 pH. There was incubation in a growth room with temperature of 25 ± 5 °C and photoperiod of 16 h light at a luminous intensity of 30 μmol m2 s-1. The cv. Emepa 1 micropropagation protocol was developed according to the existing literature, comprising the following phases: establishing of explants (EE); multiplication (MU); extent rooting (EN). A completely randomized design (CRD) was used in all the phases as follows: EE - DIC with 6 treatments comprised of 10 repetitions containing 1 explants per bottle; MU - CRD with 8 treatments, comprised of 10 repetitions containing 1 explants per bottle. It was concluded that the concentration of 2% of sodium hypochlorite for 10 min causes gems disinfestations and the establishment can be carried out by means of tillage without any growth regulators. The etiolating can be achieved in MS with 1.86 mg L-1 of ANA and regeneration in MS with 1.8 mg L-1 of the ANA + 2.0 mgL-1 of BAP. For the multiplication, the type of tillage indicated is MS supplemented with 2.0 mg L-1 of BAP + 0.5 mg L-1 of ANA; in extent, the type of crop MS without any dilution causes the highest growth of seedlings whereas the addition of ANA prompts an increase in number and a decrease of seedling's root size and the organic compound favors an increase and development of pineapple seedlings produced in vitro during the acclimatizing phase.

de Souza E.P.,Federal University of Paraiba | Mendonca R.M.N.,Federal University of Paraiba | Silva S.M.,Federal University of Paraiba | Estrela M.A.,Federal University of Paraiba | And 2 more authors.
Revista Brasileira de Fruticultura | Year: 2010

The need for asexual propagation techniques recommended for commercial seedlings production, limits the commercial expansion of yellow mombin tree. Therefore, an experiment was set at the Empresa de Pesquisa Agropecuária da Paraíba - EMEPA with the aim of evaluating the best method of grafting for yellow mombin tree. It was used the randomized block design with four replications in a split-plot in time scheme, standing in the plots the methods of grafting (cleft grafting, splice grafting, and side-veneer grafting), and in the sub-plots the periods of evaluation (8 periods). Each experimental unit consisted of 12 plants. The assessments of growth, sprout length of the graft (cm), diameter of the shooting of graft (mm), and number of shoots per graft were carried out each fi fteen days since the setting of the assay. The percentage of grafting success was determined at 120 days after grafting. The data were analyzed and interpreted using analysis of variance. The highest percentages of grafting success for the yellow mombin tree were verifi ed for the methods of splice grafting and side-veneer grafting. The growth of the grafts was more vigorous in the splice grafting.

Loading EMEPA PB collaborators
Loading EMEPA PB collaborators