Morfologia, ultraestrutura e morfometria do tegumento da paca (Cuniculus paca Linnaeus, 1766) criada em cativeiro

Abstract

Pesq. Vet. Bras. 33(5): 674-682, maio 2013 674 RESUMO.-Considerando-se a falta de informações detalhadas sobre a morfologia da paca, sendo o segundo maior roedor da fauna brasileira, de excelente qualidade de carne e, dada a importância do tegumento comum, inclusive para o bom manejo em cativeiro, e até mesmo estudos como uma opção de animal de experimentação, descreveu-se a morfologia, morfometria e a ultraestrutura da pele de oito pacas Considering the lack of detailed information about the morphology of paca, which is the second largest rodent of Brazilian's fauna, with excellent meat quality and, due to the importance of the common integument, we described the morphology, ultrastructure and morphometry of the skin of eight pacas (Cuniculus paca), males and females, through comparative analysis of skin's segments of the cervical, dorsal and medial carpal portions. Macroscopic characteristics of the coat were studied. Part of the segments of cutaneous regions was analyzed by light microscopy, and the other part by scanning electron microscopy. We measured the thickness of dermis, epidermis, stratum corneum, the profiles of the collagen fibers of reticular dermis and the area of filled sebaceous gland cells. The results were analyzed by descriptive statistics and "T" test (p<0.001). The color of the coat is reddish brown with bristles arranged in groups. The architecture of the skin and skin appendages resembles those of mammals in general, although there are no sweat glands. According to the morphometric analysis, this study shows differences of the skin architecture between male and female pacas and also between various body regions in the same animal.

Quantitative and descriptive histological aspects of jaguar (Panthera onca Linnaeus, 1758) ear skin as a step towards formation of biobanks

“…Thickness, not only of the epidermis but also of the dermis, may influence the transport of substances (Grabau et al, ), such as cryoprotectants, used in cryopreservation protocols. Both values were lower than those found in the neck region of Cuniculus paca (3,120.90 μm; Isola et al, ), and in the mid‐thoracic region of rhesus monkey and pig (1,457.2 μm and 3,848.2 μm, respectively; Grabau et al, ). However, it was higher than the dermal thickness in the ear skin region of collared peccaries ( Pecari tajacu , 222.6 μm, Borges, Bezerra, et al, ).…”

“…Depending on the location on the body of the animal, the skin varies in the thickness of the epidermis (Isola, Moraes, Rahal, & Machado, ) and density of hair (Meyer, Schwarz, & Neurand, ). Thus, in body regions that have thin skin, such as the ear region, there are usually 3–4 layers in the epidermis with the lucidum layer being absent and the granulosum layer being absent or incomplete (Affolter & Moore, ).…”

“…In the present study, the percentage of collagen fibres varied between 49% and 65% in the black and yellow jaguars, respectively. Some authors correlate the variation in the proportion of collagen fibres in the dermis with the age (Yang et al, ) and gender of the animal (Isola et al, ). This explanation for variation is not applicable to our study because both animals used were adults close in age and of the same gender; however, a correlation was observed between the thickness of the dermis and the percentage and diameter of collagen fibres (Meyer & Neurand, ).…”

Caracterização histomorfológica do sistema tegumentar auricular de cateto - Pecari tajacu Linnaeus, 1758)

“…1E). Essa localização da glândula sebácea se assemelhou à identificada em cervídeos (Nagaraju et al, 2012), pacas (Isola et al, 2013) e suínos (Vardaxis et al, 1997). Na coloração com tricrômico de Gomori, foram observadas fibras colágenas de espessura aparentemente homogênea.…”

A study on the morphoquantitative and cytological characteristics of the bulbar conjunctiva of the maned wolf (Chrysocyon brachyurus; Illiger, 1815)

“…PAS stain facilitates the visualization of goblet cells, staining the mucin produced and secreted by these cells magenta (PAS‐positive) (Gasser et al., 2011), Isola et al., 2013) and Sebbag et al., 2016). This stain distinguishes mucin from other structures; moreover, the typical oval shape already been described (Sebbag et al., 2016) was observed.…”