1,556 research outputs found

    Bio-Security Proficiencies Project for Beginning Producers in 4-H

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    Improving bio-security practices among 4-H members who raise and show project animals is important. Bio-security measures can reduce the risk of disease spread and mitigate potential health and economic risks of disease outbreaks involving animal and zoonotic pathogens. Survey data provided statistical evidence that the Bio-Security Proficiencies Project for Beginning Producers in 4-H advanced youth participants\u27 knowledge and skills related to bio-security and financial risk management. Furthermore, the project provided youth with opportunities to apply their understanding and abilities to authentic settings and extend their learning to their communities

    Aspectos sociais do sistema produtivo de propriedades da pecuária de corte familiar na metade Sul do Rio Grande do Sul.

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    O objetivo deste trabalho foi caracterizar e apreender a realidade de pecuaristas familiares, em três localidades situadas na metade sul do RS: Cerro da Jaguatirica, no município de Manoel Viana; Santa Barbinha em Caçapava do Sul, e Palmas em Bagé. O diagnóstico envolveu entrevistas utilizando um questionário semi-estruturado em 30 unidades produtivas, abrangendo um total de 110 pessoas, e reuniões participativas dos técnicos da Embrapa Pecuária Sul, Emater/RS e os produtores. Esse diagnóstico teve foco em características sociais e do sistema produtivo, abrangendo um conjunto de informações essenciais para o entendimento das lógicas de produção e sobrevivência dessas famílias.bitstream/item/33159/1/BP-35.pd

    Metodologia científica: protocolo para avaliação sensorial de carne bovina.

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    bitstream/CPPSE-2010/18949/1/PROCIComT92RTN2009.00298.pd

    Melhoramento genético participativo de bovinos de corte: estratégias para pecuaristas familiares.

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    Algumas considerações sobre a pecuária familiar; O papel do melhoramento genético; Definição de objetivos de criação e critérios de seleção; Estratégias para identificação, seleção e acasalamento de animais superiores; Como racionalizar o investimento em genética.bitstream/item/55807/1/CT36.pd

    Idade e peso ao primeiro parto de novilhas cruzadas Blonde D'Aquitaine x Zebu.

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    O objetivo deste trabalho foi comparar a idade e o peso ao primeiro parto de novilhas filhas de touros das raças Nelore e Blonde d'Aquitaine (B) com vacas Zebu (Z) e cruzadas B x Z. Os dados foram analisados pelo método dos quadrados mínimos, utilizando-se um modelo matemático que incluiu os efeitos de ano e época de nascimento, raça do pai da novilha (RPN) e grupo genético da novilha dentro de RPN. Foram feitas também análises que incluíram apenas fêmeas filhas de touros Blonde e fêmeas acasaladas com touros Blonde. Os resultados mostraram que as novilhas 3/4 B + 1/4 Z foram mais jovens e mais leves ao primeiro parto do que as novilhas 1/2 B + 1/2 Z

    Evaluation of the number and information content of fluorescent-labeled SSR markers for rice germplasm characterization.

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    The use of fluorescent-labelled simple sequence repeat (SSR) markers allows the simultaneous analysis of diverse loci in multiplex series, providing an enhanced precision of the determination of the allele size when a large number of genotypes is used. Twenty-five fluorescent-labelled SSR markers were used to genotype 242 accessions of the Brazilian Rice Core Collection. Based on the Polymorphism Information Content (PIC) values of each marker, groups with 5, 10, 15 and 20 markers were formed. The average PIC values varied from 0.67 to 0.89 and the number of alleles sampled per group, from 70 to 377. In the case of rice, which has a narrow genetic base, the conclusion was drawn that it is of fundamental importance that the genotypes must be evaluated by the highest possible number of regularly spaced SSR markers in the genome, and that these, preferentially, should offer a high information content

    Alfvén Eigenmodes in shear reversed plasmas

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    Experiments on JT-60U and JET have shown that plasma configurations with shear reversal are prone to the excitation of unusual Alfvén eigenmodes by energetic particles. These modes emerge outside the TAE frequency gap, where one might expect them to be strongly damped. The modes often appear in bunches and they exhibit a quasi-periodic pattern of predominantly upward frequency sweeping (Alfvén Cascades) as the safety factor q changes in time. This work presents a theory that explains the key features of the observed unusual modes including their connection to TAE’s as well as the modifications of TAE’s themselves near the shear reversal point. The developed theory has been incorporated into a reduced numerical model and verified with full geometry codes. JET experimental data on Alfvén spectroscopy have been simulated to infer the mode numbers and the evolution of qmin in the discharge. This analysis confirms the values of q that characterize the internal transport barrier triggering in reversed shear plasmas

    Características de produtividade de fêmeas bovinas Blonde D'Aquitaine x Zebu.

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    O objetivo deste trabalho foi comparar as relações peso do bezerro ao nascimento (RPN) e peso do bezerro à desmama (RPD) por peso da vaca ao parto de fêmeas Zebu (Z) e cruzadas Blonde d'Aquitaine (B) x Z, acasaladas com touros das raças Nelore e Blonde. Os dados foram analisados pelo método dos quadrados mínimos, utilizando-se um modelo matemático que incluiu os efeitos de ano e mês de nascimento do bezerro, idade da vaca ao parto, sexo, raça do pai do bezerro (RPB) e grupo genético do bezerro dentro de RPB. Os resultados mostraram que vacas 1B1Z foram mais eficientes do que vacas retrocruzadas, com relação a RPD, independentemente do touro utilizado como pai do bezerro

    Determination of genetic variability of traditional varieties of Brazilian rice using microsatellite markers.

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    The rice (Oryza sativa) breeding program of the Rice and Bean research center of the Brazilian agricultural company Empresa Brasileira de Pesquisa Agropecuária (Embrapa) is well established and provides new cultivars every year to attend the demand for improved high yielding varieties with tolerance to biotic and abiotic stresses. However, the elite genitors used to compose new populations for selection are closely related, contributing to the yield plateau reached in the last 20 years. To overcome this limit, it is necessary to broaden the genetic basis of the cultivars using diverse germplasm such as wild relatives or traditional varieties, with the latter being more practical because they are more easily crossed with elite germplasm to accelerate the recovery of modern plant types in the breeding lines. The objective of our study was to characterize the allelic diversity of 192 traditional varieties of Brazilian rice using 12 simple sequence repeat (SSR or microsatellite) markers. The germplasm was divided into 39 groups by common name similarity. A total of 176 alleles were detected, 30 of which (from 23 accessions) were exclusive. The number of alleles per marker ranged from 6 to 22, with an average of 14.6 alleles per locus. We identified 16 accessions as a mixture of pure lines or heterozygous plants. Dendrogram analysis identified six clusters of identical accessions with different common names and just one cluster with identical accessions with the same common name, indicating that SSR markers are fundamental to determining the genetic relationship between landraces. A subset of 24 landraces, representatives of the 13 similarity groups plus the 11 accessions not grouped, was the most variable set of genotypes analyzed. These accessions can be used as genitors to increase the genetic variability available to rice breeding programs
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