Frequência alélica do gene da aromatase (Cyp19) em ovinos Santa Inês.

Pesquisa financiada pelo CNPq. ZOOTEC

Organização e gestão da unidade produtiva.

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Random regression analyses using B-spline functions to model growth of Nellore cattle

The objective of this study was to estimate (co)variance components using random regression on B-spline functions to weight records obtained from birth to adulthood. A total of 82 064 weight records of 8145 females obtained from the data bank of the Nellore Breeding Program (PMGRN/Nellore Brazil) which started in 1987, were used. The models included direct additive and maternal genetic effects and animal and maternal permanent environmental effects as random. Contemporary group and dam age at calving (linear and quadratic effect) were included as fixed effects, and orthogonal Legendre polynomials of age (cubic regression) were considered as random covariate. The random effects were modeled using B-spline functions considering linear, quadratic and cubic polynomials for each individual segment. Residual variances were grouped in five age classes. Direct additive genetic and animal permanent environmental effects were modeled using up to seven knots (six segments). A single segment with two knots at the end points of the curve was used for the estimation of maternal genetic and maternal permanent environmental effects. A total of 15 models were studied, with the number of parameters ranging from 17 to 81. The models that used B-splines were compared with multi-trait analyses with nine weight traits and to a random regression model that used orthogonal Legendre polynomials. A model fitting quadratic B-splines, with four knots or three segments for direct additive genetic effect and animal permanent environmental effect and two knots for maternal additive genetic effect and maternal permanent environmental effect, was the most appropriate and parsimonious model to describe the covariance structure of the data. Selection for higher weight, such as at young ages, should be performed taking into account an increase in mature cow weight. Particularly, this is important in most of Nellore beef cattle production systems, where the cow herd is maintained on range conditions. There is limited modification of the growth curve of Nellore cattle with respect to the aim of selecting them for rapid growth at young ages while maintaining constant adult weight

Aromatase gene and its effects on growth, reproductive and maternal ability traits in a multibreed sheep population from Brazil

We determined the polymorphism C242T of the aromatase gene (Cyp19) and its allelic frequency, as well as the effect of the variants on productive and reproductive traits in 71 purebred Santa Inês sheep, 13 purebred Brazilian Somali sheep, nine purebred Poll Dorset sheep, and 18 crossbred 1/2 Dorper sheep. The animals were genotyped using the PCR-RFLP technique. The influence of the animal's genotype on its performance or on the performance of its lambs was analyzed by the least square method. Another factor assessed was the importance of the animal's genotype in analysis models for quantitative breeding value estimates, and whether there were differences among the averages of breeding values of animals with different genotypes for this gene. In the sample studied, no AA individuals were observed; the AB and BB frequencies were 0.64 and 0.36, respectively. All Brazilian Somali sheep were of genotype BB. All 1/2 Dorper BB animals presented a lower age at first lambing, and the Santa Inês BB ewes presented a lower lambing interval. In these same genetic groups, AB ewes presented higher litter weight at weaning. This is evidence that BB ewes have a better reproductive performance phenotype, whereas AB ewes present a better maternal ability phenotype. However, in general, animals with genotype AB presented better average breeding values than those with genotype BB

Caracterização dos produtores do núcleo rural Buriti Vermelho - DF (2009).

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Caracterização do sistema de plantio adotado por produtores em comunidades no Vale do Rio Urucuia - MG (2009).

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Programa Nacional de Melhoramento do Guzerá para Leite: resultados do Teste de Progênie, do Arquivo Zootécnico Nacional e do Núcleo MOET.

Este documento vem sendo, anual e regularmente, publicado desde 2000, como fruto de um esforço conjunto da coordenação do Programa Nacional de Melhoramento do Guzerá para Leite (PNMGuL), apoiada por parceiros de distintas instituições nacionais de ensino e pesquisa e de diversas fazendas leiteiras colaboradoras do teste de progênie. Esta interação fortalece e estimula todos os envolvidos a dar continuidade à iniciativa, para tão somente valorizar este importante recurso genético tropical por meio de seu melhoramento genético para objetivos específicos de seleção. Nesta edição, está disponível o mérito genético de 765 touros e 586 matrizes da raça Guzerá na forma de classificação (ranking) para leite, além de seus constituintes (gordura, proteína e sólidos totais), idade ao primeiro parto, eficiência na produção de leite, reação ao ambiente produtivo e outras 14 características de crescimento e reprodução, economicamente relevantes para os sistemas de produção de leite e de duplo propósito.bitstream/item/224354/1/DOC-256-Guzera-Portugues-EGL45anos.pd

Taxonomic and Functional Microbial Signatures of the Endemic Marine Sponge Arenosclera brasiliensis

The endemic marine sponge Arenosclera brasiliensis (Porifera, Demospongiae, Haplosclerida) is a known source of secondary metabolites such as arenosclerins A-C. In the present study, we established the composition of the A. brasiliensis microbiome and the metabolic pathways associated with this community. We used 454 shotgun pyrosequencing to generate approximately 640,000 high-quality sponge-derived sequences (∼150 Mb). Clustering analysis including sponge, seawater and twenty-three other metagenomes derived from marine animal microbiomes shows that A. brasiliensis contains a specific microbiome. Fourteen bacterial phyla (including Proteobacteria, Cyanobacteria, Actinobacteria, Bacteroidetes, Firmicutes and Cloroflexi) were consistently found in the A. brasiliensis metagenomes. The A. brasiliensis microbiome is enriched for Betaproteobacteria (e.g., Burkholderia) and Gammaproteobacteria (e.g., Pseudomonas and Alteromonas) compared with the surrounding planktonic microbial communities. Functional analysis based on Rapid Annotation using Subsystem Technology (RAST) indicated that the A. brasiliensis microbiome is enriched for sequences associated with membrane transport and one-carbon metabolism. In addition, there was an overrepresentation of sequences associated with aerobic and anaerobic metabolism as well as the synthesis and degradation of secondary metabolites. This study represents the first analysis of sponge-associated microbial communities via shotgun pyrosequencing, a strategy commonly applied in similar analyses in other marine invertebrate hosts, such as corals and algae. We demonstrate that A. brasiliensis has a unique microbiome that is distinct from that of the surrounding planktonic microbes and from other marine organisms, indicating a species-specific microbiome

Programa Nacional de Melhoramento do Guzerá para Leite: resultados do Teste de Progênie, do Programa de Melhoramento Genético de Zebuínos da ABCZ e do Núcleo MOET.

Este documento vem sendo, anual e regularmente, publicado desde 2000, como fruto de um esforço conjunto da coordenação do Programa Nacional de Melhoramento do Guzerá para Leite (PNMGuL), apoiada por parceiros de distintas instituições nacionais de ensino e pesquisa e de diversas fazendas leiteiras colaboradoras do teste de progênie. Esta interação fortalece e estimula todos os envolvidos a dar continuidade à iniciativa, para tão somente valorizar este importante recurso genético tropical por meio de seu melhoramento genético para objetivos específicos de seleção.bitstream/item/214296/1/DOC-249-Guzera-2020.pd