1998
DOI: 10.1590/s0103-84781998000400018
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Exame andrológico em touros: qualidade dos indicadores da aptidão reprodutiva em distintos grupos raciais

Abstract: Os padrões recomendados para os componentes do exame andrológico são únicos para todas as raças e sistemas de produção, resultando em perdas económicas pela eliminação de reprodutores em alguns conjuntos raciais. O presente estudo apresenta uma análise retrospectiva sobre dois conjuntos de dados de campo, comparando grupos contemporâneos de touros de raças puras taurinas e derivadas de cruzamento com zebuínos. Os resultados indicam que o uso de padrões mais flexíveis resultam em um comportamento semelhante dos… Show more

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Cited by 16 publications
(16 citation statements)
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“…The data presented in Table 3 shows that Braford bulls suffered a culling rate (32%) higher than that described in the literature for purebred breeds (Johnson et al, 1995;Bruner et al, 1995;Gottschall and Mattos, 1997;Ribeiro Filho et al, 1997), although similar breeding soundness culling rates have been reported for synthetic bulls (Chenoweth et al, 1996;Moraes et al, 1998;Chacon et al, 1999). In contrast to what we found for the Braford bulls, the reproductive fitness culling rate for the synthetic Brangus-Ibagé bulls was only 17% (Table 4).…”
Section: Discussionsupporting
confidence: 60%
See 1 more Smart Citation
“…The data presented in Table 3 shows that Braford bulls suffered a culling rate (32%) higher than that described in the literature for purebred breeds (Johnson et al, 1995;Bruner et al, 1995;Gottschall and Mattos, 1997;Ribeiro Filho et al, 1997), although similar breeding soundness culling rates have been reported for synthetic bulls (Chenoweth et al, 1996;Moraes et al, 1998;Chacon et al, 1999). In contrast to what we found for the Braford bulls, the reproductive fitness culling rate for the synthetic Brangus-Ibagé bulls was only 17% (Table 4).…”
Section: Discussionsupporting
confidence: 60%
“…In a population of 751 bulls raised in southern Brazil the culling rate due to alterations in semen quality was 47% for Braford bulls but only 18% for Hereford bulls raised under the same conditions (Moraes et al, 1998). According to various authors between 80 and 90% of purebred animals have no reproductive problems (Johnson et al, 1995;Bruner et al, 1995;Gottschall and Mattos, 1997;Ribeiro Filho et al, 1997;Kennedy et al, 2002) but in their study of 48 crossbred bulls Rao and Rao (1991) found that only 47% could be considered reproductively sound.…”
Section: Introductionmentioning
confidence: 98%
“…Esta reduzida fertilidade deve-se, em grande parte, a problemas reprodutivos nas fêmeas, agravados por condições desfavoráveis de manejo e ambiente, mas os machos também influenciam este quadro, pois estudos têm evidenciado expressiva freqüência de animais com inadequada capacidade reprodutiva (Carrol et al, 1963;Coulter & Kozub, 1989;Fonseca et al, 1997;Moraes et al, 1998). O fato de existir grande variabilidade no desempenho dos touros é relevante devido ao expressivo número de fêmeas submetidas ao sistema de monta natural no Brasil e enfatiza, portanto, a necessidade de selecionar animais geneticamente superiores, capazes de influenciar parâmetros associados a um melhor desempenho do rebanho, como precocidade sexual e fertilidade.…”
Section: Introductionunclassified
“…BSE allows the obtaining of information about the potential fertility of bulls, and its importance has been reported by several authors such as Lagerloff (1936), Silva et al (1981), Fonseca et al (1997), Moraes et al (1998), Menegassi et al (2008) and Lopes et al (2009). However, the economic advantages of bull BSE prior to the breeding season still have to be further investigated, because the current studies about bioeconomic impact of technologies are related mainly to beef heifers (Pfeifer et al, 2008) and few of them relate the use of technology with the BSE in bulls.…”
Section: Introductionmentioning
confidence: 94%