Persistence Of Lactation
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Intake, digestibility and nitrogen use efficiency in crossbred F1 Holstein × Zebu grazing cows
The objective of this study was to evaluate intake, digestibility and nitrogen (N) compounds use efficiency in F1 Holstein × Zebu grazing cows. Eighteen crossbred cows (six Holstein × Gir, six Holstein × Guzerat, and six Holstein × Nellore) were used in the experiment, constituting three experimental treatments in simple random samples, under the same fe
Revista Brasileira de Zootecnia. Publicado em: 2012-04
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2. Medidas de persistência da produção de leite em rebanhos Gir Leiteiro utilizando modelos de regressão aleatória / Persistency of milk yield measures in Gyr herds using random regression models
Data comprising 27,000 test-day milk yield (TDMY) records of 3,362 first lactations of Gyr cows calving between 1990 and 2007 were used to compare random regression models for biweekly TDMY and to evaluate persistency of lactation milk yield (PS) measures. Records were analyzed by random regression models (RRM). Random trajectories were fitted by Wilminks (W
Publicado em: 2009
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3. Non-genetic effects on the parameters of the generalized Michaelis-Menten model for lactation curves / Efeitos não genéticos nos parâmetros do modelo de Michaelis-Menten generalizado para curvas de lactação
O presente trabalho foi conduzido com o objetivo de fazer uma descrição biológica detalhada das curvas de lactação de vacas de um rebanho da raça Holandesa, em função dos fatores de meio ambiente. Foram utilizadas 759 lactações de 387 vacas com partos ocorridos nos anos de 2002 a 2008. A função generalizada de Michaelis-Menten foi ajustada para e
Publicado em: 2009
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4. ESTUDO DA PERSISTÊNCIA E PRODUÇÃO DE LEITE DE VACAS DA RAÇA HOLANDESA UTILIZANDO MODELO DE REGRESSÃO ALEATÓRIA / STUDY OF THE PERSISTENCE OF THE LACTATION IN HOLSTEIN COWS USING A RANDOM REGRESSION MODEL
A total of 21,702 test day milk yield records had been used of 2.429 first parity Holstein cows from 1991 and 2003, distributed in 33 herds of the state of Rio Grande do Sul, with the objective to estimate genetic parameters for persistence of lactation and milk production in the day of the control, to evaluate the relative efficiency of the selection for pe
Publicado em: 2006
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5. Desenvolvimento reprodutivo de ratos machos expostos ao fenvalerato in utero e lactação / Reproductive development of male rats exposed to fenvalerate in utero and lactation
Fenvalerate is a synthetic pyrethroid insecticide used in agriculture, cattle raising and in the control of domestic insects, and its reproductive effects are little-known.Some studies already have proposed that fenvalerate is an endocrine disruptor, acting as an environmentalestrogen. Studies done with rats exposed to some pyrethroids showed reduction of sp
Publicado em: 2005
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6. Ocorrência de compostos organoclorados (pesticidas e PCBs) em mamíferos marinhos da costa de São Paulo (Brasil) e da Ilha Rei George (Antártica). / Occurrence of organochlorine compounds (pesticides and PCBs) in marine mammals from São Paulo coast (Brazil) and King George Island (Antarctica).
Organochlorine compounds cause strong impact on the nature, as a consequence of three basic characteristics: environmental persistence, bioaccumulation, and high toxicity. The marine mammals are one of the most vulnerable organisms to the chronic toxicity of these contaminants. Besides the high concentration in the body, the female transfers part of her load
Publicado em: 2002
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7. Molecular Epidemiology of Streptococcus uberis Isolates from Dairy Cows with Mastitis
Pulsed-field gel electrophoresis and antimicrobial sensitivity testing were used as tools to investigate the epidemiology of Streptococcus uberis mastitis in dairy cows. A total of 62 different strains were found among 138 isolates from the four herds investigated, and between 10 and 26 different strains were found in each herd. There was no strain common to
American Society for Microbiology.
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8. Evidence for long-term memory of the mucosal immune system: milk secretory immunoglobulin A against Shigella lipopolysaccharides.
Although the common mucosal immune system has generally been considered to have only short-term memory, recent data suggest that long-term memory exists for Shigella virulence plasmid antigens. Because such antigens might cross-react with environmental antigens, we investigated milk for the persistence of antibodies to the specific Shigella lipopolysaccharid