Comparação entre metodologias para avaliar a idade à primeira concepção em éguas puro-sangue inglês

In Brazil, due to the breeding season for Thoroughbred, the reproductive data are normally truncate, since the breeders try to get animals that were born at the beginning of the breeding season in order to take their competitive advantages (more developed, mature and trained animals) compared to animals born later in the same breeding season. To analyze these data suitable methods should be used. Then, this paper aims to compare three methodologies: the method of maximum restricted likelihood, using MTDFREML, bayesian analysis without censured data by software MTGSAM and bayesian analysis with censured data by software LMCD, to evaluate age at first conception in thoroughbred mares, in order to verify its impact on the choice of stallions during selection. The database contained 3509 records for age at first conception (months) for thoroughbred mares. The heritability estimates were 0.23, 0.30 and 0.0926 (log scale), for MTDF, MTGSAM and LMCD, respectively. Considering all animals in the pedigree (6713), ranking correlations varied from 0.91 to 0.99. When only stallions were considered (656), those varied from 0.48 to 0.99 (considering different percentages of selected males) between evalua-tion methods. The highest changes in the general classification were observed when LMCD was compared to the other two methods. As the linear censured model is the most suitable for trait analysis with censured data, it was observed that censure information would lead to the choice of different animals during the selection process, when compared to the two other methodologies.

¿Inestabilidad o estabilidad en la política brasileña? Partidos políticos y presidente de la República contra la incertidumbre

This article examines what political scientists think of the Brazilian political system, especially in regard to the relationship between the executive and legislative branches. There are two opposing camps of scholars who focus on how political parties behave in the Chamber of Deputies. While the first defends a political system that produces undisciplined representatives, the second supports a legislative organization that produces disciplined politicians.

Estimación de población en áreas menores mediante variables sintomáticas: una aplicación para los departamentos de la República Argentina, 1991 y 1996

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Migración y salud en zonas fronterizas: Haití y la República Dominicana

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Tempo de passagem de sementes pelo trato digestório de aves frugívoras, uma primeira avaliação no Brasil

The transit time of seeds ingested by frugivorous animals has important implications for the spatial distribution of seeds and their dispersal distance. Nevertheless, this parameter is rarely included in seed dispersal studies. In this paper, we provide information about the transit time of seeds of nine species of plants ingested by individuals of six species of captive birds (Turdus albicollis, T. amaurochalinus, T. leucomelas, T. rufiventris, Stephanophorus diadematus and Saltator similis). We found that (1) seeds are regurgitated quickly through the digestive tract of birds than defecated seeds, and (2) large seeds (e.g., > 5 mm in diameter for Turdus spp.) are regurgitated rather than defecated. These results corroborate other studies, but the relationship between seed size and transit time seems to be quite complex and variable, requiring more detailed studies on this important aspect of the ecology of seed dispersal and digestive physiology of frugivorous birds.

República de Venezuela: distribución geográfica de la población y migraciones internas

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República Dominicana: la mortalidad infantil en Santo Domingo en la década de los años 80: informe del estudio sobre la mortalidad mediante el método del hijo previo

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La mortalidad en la República Argentina según tablas de vida de 1914, 1946-48 y 1959-61

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La población de la República de Panamá en el período 1950-1980

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República Argentina: algunos efectos sociales y económicos derivados de la baja mortalidad entre 1900 y 1960

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La población nativa de países limítrofes presente en la República Argentina, según el Censo de Población de 1960

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La fecundidad en la República Dominicana, 1960-1975, calculada a partir de los datos de la Encuesta Nacional de Fecundidad

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La población nativa de países limítrofes presente en la República Argentina, según el Censo de Población de 1960

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