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| Registros recuperados: 58 | |
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| Wu, JunJie. |
| The Resource and Agricultural Policy System (RAPS) is upgraded and documented in this technical report. RAPS was developed to estimate the environmental impacts of farming practices and policy in 128,591 National Resources Inventory (NRI) sites in the Central United States (the Corn Belt, Lake States, and Northern Plains). This modeling system integrates the effects of soils, climate, crops, and management practices on several environmental indicators including nitrate runoff and leaching, pesticide runoff and leaching, water and wind erosion, and soil organic carbon. RAPS can be used to provide timely information on the nation's environmental health as it is impacted by agriculture and by changes in agricultural and resource policies. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural policy; Carbon sequestration; Conservation practices; Environmental effects; Integrated modeling systems; Nitrate water pollution; Soil erosion; Agricultural and Food Policy. |
| Ano: 2000 |
URL: http://purl.umn.edu/18654 |
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| Toral,Fábio Luiz Buranelo; Torres Júnior,Roberto Augusto de Almeida; Lopes,Paulo Sávio; Silva,Luiz Otávio Campos da; Reis Filho,João Cruz. |
| The objective of this study was to evaluate alternatives for modeling the age of dam at calving (AOD) effect on the weaning weight of Charolais-Zebu crossbred calves. Data from 56,965 calves were analyzed, using statistical models considering the fixed effects of the contemporary groups, sire and dam genetic groups, and AOD. The AOD effect was fitted to models using annual age classes, and ordinary quadratic to quintic-ordered polynomials (OP) or segmented polynomials (SP) with two, three, four, six and twelve evenly spaced intervals. In the case of segmented polynomials, general linear and quadratic effects and only one quadratic additional term from each knot were considered. The AOD effects were nested within sex of calf in all cases. According to the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Beef cattle; Environmental effects; Genetic evaluation; Least square. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000700011 |
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| Peixoto,M.G.C.D.; Bergmann,J.A.G.; Fonseca,C.G.; Penna,V.M.; Pereira,C.S.. |
| Data on 1,294 superovulations of Brahman, Gyr, Guzerat and Nellore females were used to evaluate the effects of: breed; herd; year of birth; inbreeding coefficient and age at superovulation of the donor; month, season and year of superovulation; hormone source and dose; and the number of previous treatments on the superovulation results. Four data sets were considered to study the influence of donors elimination effect after each consecutive superovulation. Each one contained only records of the first, or of the two firsts, or three firsts or all superovulations. The average number of palpated corpora lutea per superovulation varied from 8.6 to 12.6. The total number of recovered structures and viable embryos ranged from 4.1 to 7.3 and from 7.3 to 13.8,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cattle; Zebu; Superovulation; Environmental effects; MOET nucleus. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000400019 |
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| Correia,Gisele Batista; Siqueira-Souza,Flávia Kelly; Freitas,Carlos Edwar de Carvalho. |
| The flood pulse is a key factor that drives the biota of large rivers with adjacent floodplains, but the direction and intensity of its effects are not uniform for all trophic guilds of fish. In this study, we tested the existence of intra- and inter-annual changes in the relative condition factors (kn) of three Curimatidae: Potamorhina altamazonica, Potamorhina latior, and Psectrogaster rutiloides. We used weight and length data from fish that were caught in eight floodplain lakes of the Rio Solimões. These data were from experimental fisheries during each season of the hydrological cycle: flooding, flood, drying, and dry from 2004, 2005, and 2006. In general, there are similar patterns of intra-annual changes for these three species, with the highest... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Weight-length relationship; Curimatidae; Environmental effects; Relative condition factor; Floodplain lakes. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000400101 |
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| Registros recuperados: 58 | |
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