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| Antoniazzi,Alfredo Quites; Henkes,Luiz Ernani; Oliveira,João Francisco Coelho; Hansen,Thomas Ross. |
| O reconhecimento materno da gestação é o período em que o concepto sinaliza sua presença para a mãe. Em ruminantes, este período coincide com o alongamento do embrião e a máxima produção de interferon-tau (IFNT). O IFNT produzido pelo concepto age via parácrina no útero inibindo a expressão dos receptores de estrógenos (ESR1) e de ocitocina (OXTR) no epitélio luminal do endométrio, evitando, assim, a liberação de pulsos luteolíticos de prostaglandina F2 alfa (PGF2 ), hormonio responsável pelo início da luteólise. Além da sua ação durante o reconhecimento materno da gestação em ruminantes, o IFNT aumenta a expressão de vários genes estimulados por interferons (ISGs) no útero, no corpo lúteo (CL) e em células sanguíneas. Estudos recentes demonstraram que o... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Interferon-tau; Reconhecimento materno da gestação; ISG15; Ruminantes. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782011000100029 |
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| Weimer,Tania de Azevedo; Steigleder,Clara Sabina; Machado,Márcia Silveira; Almeida,Sabrina Esteves Matos; Oliveira,João Francisco Coelho; Moraes,José Carlos Ferrugem; Henkes,Luis Ernani. |
| In the detection phase of a bovine marker assisted selection program, this paper investigated the genetic variability of three microsatellites on the chromosome 18 (BTA 18). The possible associations between genotypes or alleles of these markers versus weight at first calving and a lifetime calving interval (as indicators of reproductive performance) were evaluated in a beef cattle herd (5/8 Aberdeen Angus x 3/8 Nelore). Eleven alleles were detected in TGLA227 and ILSTS002 and three in BMS3004, the most frequent being TGLA227*79, ILSTS002*133, ILSTS002*135 and BMS3004*129. Polymorphic information content ranged from 0.41 to 0.84, while heterozygosity ranged from 49% to 86%, with an average value of 77%. The association analyses performed between genotype... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Microsatellites; Reproduction; Marker assisted selection; BTA 18. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782007000500050 |
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| Henkes,Luis Ernani; Benavides,Magda Vieira; Oliveira,João Francisco Coelho; Moraes,José Carlos Ferrugem; Weimer,Tania Azevedo. |
| Cytoplasmic inheritance influence on reproductive traits was investigated in the Brangus-Ibagé cattle (3/8 Nelore x 5/8 Aberdeen Angus). Additive genetic effects were responsible for 12% ± 11% of phenotypic variation observed in first calving interval, but their contribution dropped to zero when all calving intervals (CI) were considered. The heritability estimate for age at first calving (AFC, in days) was 0.19 ± 0.09. Mitochondrial lineage (MIT) had negligible effects on phenotypic variances of calving interval (0.0 ± 0.02), calf birth weight (0.0 ± 0.01), and cow weight at calving (0.0 ± 0.01). However, for the age at first calving, MIT accounted for 0.15 ± 0.07 of total variation. Cow weight at calving had a significant linear effect on CI and AFC.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: MtDNA; Maternal inheritance; Calving interval. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782004000400030 |
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