Persistency
Mostrando 1-12 de 43 artigos, teses e dissertações.
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1. Association between gestation length and lactation performance, lactation curve, calf birth weight and dystocia in Holstein dairy cows in Iran
Abstract In this study, 252,798 lactations on 108,077 cows in 433 herds were used to determine the association between gestation length (GL) and lactation performance, lactation curve, calf birth weight and dystocia in Holstein dairy cows in Iran. The GL averaged 278.1 ± 5.41 d, was categorized as short (SGL; at 1 SD below the population mean), average (AGL
Anim. Reprod.. Publicado em: 25/11/2019
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2. Test-day or 305-day milk yield for genetic evaluation of Gir cattle
Resumo: O objetivo deste trabalho foi comparar as avaliações genéticas da produção de leite na raça Gir, em termos dos valores genéticos preditos e de suas acurácias, por meio de modelo de regressão aleatória aplicado aos registros de produção de leite no dia do controle ou de modelo tradicional aplicado às estimativas de produção de leite acu
Pesq. agropec. bras.. Publicado em: 16/05/2019
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3. Milk production in Saanen goats treated with repeated low doses of intermediate-release insulin during early lactation
RESUMO: O objetivo do estudo foi avaliar o efeito da administração de insulina sobre a resposta produtiva de cabras Saanen durante a lactação inicial. Dez de vinte fêmeas adultas foram sujeitas à administração subcutânea de repetidas e baixas doses de insulina de liberação intermediária aos 2, 9 e 14 dias pós-parto. A produção de leite foi me
Cienc. Rural. Publicado em: 04/04/2019
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4. Prevalence and titers of yellow fever virus neutralizing antibodies in previously vaccinated adults
ABSTRACT Introduction: The World Health Organization (WHO) recommends one single dose of the Yellow Fever (YF) vaccine based on studies of antibody persistency in healthy adults. We assessed the prevalence and titers of YF virus neutralizing antibodies in previously vaccinated persons aged ≥ 60 years, in comparison to younger adults. We also evaluated th
Rev. Inst. Med. trop. S. Paulo. Publicado em: 03/04/2017
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5. Especialización tecnológica, captura y formación de competencias bajo integración de mercados: comparación entre Asia y América Latina
The aim of this paper is to observe the evolution of technological specialization, convergence and the process of building technological competences for two groups of countries - Asia and Latin America - between 1985-1995 and 1999-2008. Between these periods, most of the countries in these groups registered growing levels of global integration in terms of go
Econ. soc.. Publicado em: 2013-12
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6. Environmental and genetic effects on the lactation curves of four genetic groups of crossbred Holstein-Zebu cows
The objective of this study was to evaluate the effects of genetic group and environmental factors, including farm of origin, season of calving and lactation number, on the individual lactation curves of 1,010 Holstein-Gyr, Guzerat-Holstein, Holstein-Nellore, and Holstein-Zebu F1 cows on the experimental farms of the Agricultural Research Company in Minas Ge
R. Bras. Zootec.. Publicado em: 2012-11
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7. Persistency of lactation using random regression models and different fixed regression modeling approaches
Milk yield test-day records on the first three lactations of 25,500 Holstein cows were used to estimate genetic parameters and predict breeding values for nine measures of persistency and 305-d milk yield in a random regression animal model using two criteria to define the fixed regression. Legendre polynomials of fourth and fifth orders were used to model t
R. Bras. Zootec.. Publicado em: 2012-09
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8. Dinâmica da produtividade da mão-de-obra na agropecuária de Minas Gerais: um estudo de convergência / Dynamics of labor productivity in agriculture in Minas Gerais: a study of convergence
The agricultural sector in Minas Gerais has experienced a significant increase in labor productivity since the 1960s, due to the use of modern inputs, equipments, and farming techniques driven by the green revolution. Nonetheless, the implementation of the modernization policy which brought about such advances was undertaken in an uneven fashion throughout t
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/01/2011
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9. Genetic avaluacion for persistency of lactation in Holstein cows using a random regression model
A model for analyzing test day records including both fixed and random coefficients was applied to the genetic evaluation of first lactation data for Holstein cows. Data comprising 87045 test-day milk yield records from calving between 1997 and 2001 from Holstein herds in 10 regions of the Brazilian state of Minas Gerais. Six persistency of lactation measure
Publicado em: 2010
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10. Persistência na lactação para vacas da raça Holandesa criadas no Estado do Rio Grande do Sul via modelos de regressão aleatória / Lactation persistency for Holstein cows raised in the State of Rio Grande do Sul using a random regression model
Foram utilizados 21.702 registros de produção de leite no dia do controle de 2.429 vacas primíparas da raça Holandesa, filhas de 233 touros, coletados em 33 rebanhos do Estado do Rio Grande do Sul, entre 1992 e 2003, para estimar parâmetros genéticos, para três medidas de persistência (PS1, PS2 e PS3) e para a produção de leite até 305 dias (P305)
Publicado em: 2010
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11. Características da precipitação pluviométrica do nordeste brasileiro e seus padrões de acoplamento com as TSM do Pacífico Equatorial e Atlântico Sul. / Rainfall characteristics in northeastern brazil and their patterns coupling with sst equatorial Pacific and South Atlantic.
The eastern coast of the Northeast Brazil (NEB) is a region where transient weather systems interact with local systems, modulating their frequency and intensity. Understanding the mechanisms of such interactions may be instrumental in explaining the observed precipitation patterns in this region. The objective of this work is quite within this scope and tak
Publicado em: 2010
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12. Efeito residual de herbicidas aplicados em pré-emergência em diferentes condições de restrição hídrica no solo na cultura da cana-de-açúcar / Residual activity of herbicides applied at pre-emergence in sugarcane and submitted to different soil drought periods
Devido às questões de planejamento e operações agrícolas, é utilizado cada vez mais, no setor produtivo da cana-de-açúcar, o controle químico de plantas daninhas durante o período seco do ano, uma vez que mesmo em menores densidades populacionais, podem prejudicar o desenvolvimento da cultura. Neste sentido, este trabalho foi desenvolvido com o obj
Publicado em: 2010