Morfometria do placentomo da vaca mestiça Holandês-zebu segundo a ordem de parto

Detalhes bibliográficos
Ano de defesa: 2013
Autor(a) principal: Clara de Almeida Mota
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Minas Gerais
UFMG
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/1843/SMOC-9LVGQ3
Resumo: This study was conducted to evaluate the morphological characteristics of mestiças cows placentomes with different birth orders. To this end, 15 pregnant Holstein cows, without retained placenta, were used and classified into three groups according to birth order. In the different groups were quantified: number of caruncular epithelial cells, trophoblast binucleated cells population, volumetric proportion of trophoblast binucleated cells and other structural components of the placentome. The volumetric proportion of structural components studied did not differ significantly among the three groups, except in the cases of maternal connective tissue (CM) and fetal epithelium (EF). The volumetric proportion of the CM tissue were in G1 31.36 ± 6.97, G2 19.82 ± 4.06 and in G3 19.38 ± 0.88. A statistically significant difference was observed when comparing G1 with groups 2 and 3 (P <0.05). In volumetric proportion of EF, the mean values of G1, G2 and G3 were 12.52 ± 2.57, 18.46 ± 3.11 and 22.04 ± 4.62, respectively. In this analysis there was a statistical difference between the G1 and G3 (P < 0.05), however the G2 did not differ statistically from G1 and G2 (P > 0.05). The results indicate that there is a decrease in the number of placentome CM in heifers compared to cows of 2° or more births. In the meantime, there was a increase of placentome EF in heifers compared to cows of 3° or more births. Negative, strong and very significant correlations were also observed between the placentome CM in cows, and the EF and their vessels. However, changes in the amount of CM are related to other connective tissue components than collagen, since it showed moderate positive correlations with fetal epithelium.