Seleção para eficiência produtiva de ovelhas para produção de carne.

bitstream/item/48478/1/Midia-Selecao-para.pd

Melhoramento genético como ferramenta para o crescimento e o desenvolvimento da ovinocultura de corte.

Resumo: Dentre as ações relacionadas à promoção do crescimento e do desenvolvimento de uma atividade pecuária, o melhoramento genético é uma das que mais merece atenção. Para que a ovinocultura de corte no Brasil possa se desenvolver, são necessárias a seleção e a multiplicação de genótipos apropriados aos diversos ecossistemas encontrados no país. Com a finalidade de aperfeiçoar a capacidade de produção dos animais, as ferramentas básicas do melhoramento genético são a seleção e os métodos de acasalamento. Neste trabalho são apresentadas algumas definições fundamentais do melhoramento genético e discutidas formas de sua contribuição para o crescimento da ovinocultura de corte. [Animal breeding as a tool for upgrowth and development of meat sheep sector]. Abstract: Among the actions to promote the growing and the development of an animal breeding activity, the genetic improvement is one of that more attention deserve. Selection and multiplication of genotypes appropriated to several ecossystems found in the country are necessary to the development of meat sheep sector in Brazil. To optimize the production ability of the animals, the basic tools of animal breeding are the selection and the mating methods. In this paper fundamental definitions of animal breeding are presented and forms of its contribution for the upgrowth of meat sheep sector are discussed.Palestra apresentada no XVII Congresso Brasileiro de Reprodução Animal, 31 de maio a 02 de junho de 2007, Curitiba, PR

Breeding program as a tool for education and training of young.

Abstract: The major part of technicians with knowledge in the productions systems for goats and sheep are concentrated in Northeastern and South regions of Brazil. However, in recent years, the goats and sheep industries expanded to other areas of Brazil that suffer with the absence of professionals trained with these animals. GENECOC is a breeding program coordinated by Brazilian Agricultural Research Corporation, Embrapa Goats and Sheep, and has among the objectives to assist in training of human resources with specific skills on the animal breeding and production systems of meats goats and sheep. The program had supported the training of 36 students, being 14 graduate students and the development of 16 master projects and 6 PhD theses and it also has abroad actions. A breeding program with its dynamic process can help the education of the young preparing them to their professional life

Evolving wormhole geometries within nonlinear electrodynamics

In this work, we explore the possibility of evolving (2+1) and (3+1)-dimensional wormhole spacetimes, conformally related to the respective static geometries, within the context of nonlinear electrodynamics. For the (3+1)-dimensional spacetime, it is found that the Einstein field equation imposes a contracting wormhole solution and the obedience of the weak energy condition. Nevertheless, in the presence of an electric field, the latter presents a singularity at the throat, however, for a pure magnetic field the solution is regular. For the (2+1)-dimensional case, it is also found that the physical fields are singular at the throat. Thus, taking into account the principle of finiteness, which states that a satisfactory theory should avoid physical quantities becoming infinite, one may rule out evolving (3+1)-dimensional wormhole solutions, in the presence of an electric field, and the (2+1)-dimensional case coupled to nonlinear electrodynamics.Comment: 17 pages, 1 figure; to appear in Classical and Quantum Gravity. V2: minor corrections, including a referenc