Abstract
A histological study of New Zealand White female rabbits’ ovaries was undertaken. Rabbits were fed on canola meal as an increasing substitute (00, 33, 66 and 100%) for soybean meal so that the tissue’s general aspects could be verified and the number of ovarian follicles from each experimental group could be obtained. Forty-eight female rabbits were slaughtered at 43, 150 and 225 days of age and their ovaries were fixed in Bouin’s liquid, washed and conserved in 70% ethanol and embedded in paraffin. 5µm-thick histological sections were undertaken and stained by HE and Azan techniques. The ovaries were bound by a predominantly simple cubic epithelium followed by the tunica albuginea. Ovarian follicles were observed in different stages of development in the cortical tissue. Interstitial gland cells, blood and lymphatic vessels and nerves were observed in the medullar tissue. Small cysts were also reported. Histological preparations didn’t show any change between groups either in the general morphology of the tissue or in follicle number. This fact suggests that the use of canola as a food of rabbits didn’t interfere in reproduction.
Highlights
Estudos realizados com farelo de canola, como fonte alternativa protéica em substituição às fontes clássicas, como farelo de soja e algodão, têm sido realizados sobre o desempenho zootécnico dos animais de interesse econômico
Histological analysis of ovaries of female rabbits fed on canola meal gradually substituting soybean meal
Rabbits were fed on canola meal as an increasing substitute (00, 33, 66 and 100%) for soybean meal so that the tissue’s general aspects could be verified and the number of ovarian follicles from each experimental group could be obtained
Summary
Os dados de algumas publicações a respeito do uso de farelo de canola sobre os aspectos reprodutivos de fêmeas, desde o nascimento até o período reprodutivo, são raros e contraditórios. Estudos prévios em suínos mostraram hiperplasia da tireóide e hipertrofia do seu epitélio folicular (Ochetim et al, 1980, citado por Bell et al, 1980), redução da capacidade de reserva (Ochetim et al, 1980), níveis reduzidos de tri-iodotironina (T3) e tiroxina (T4) no plasma sangüíneo de ovinos (Norton et al, 1989) e decréscimo linear dos níveis de insulina no leite de vacas à medida que se aumentava a concentração de farelo de canola na ração (Khorasani et al, 1992). O objetivo deste trabalho foi estudar a influência da substituição gradativa (0, 33, 66 e 100%) do farelo de soja (FS) pelo farelo de canola (FC) sobre desenvolvimento reprodutivo de coelhas da raça Nova Zelândia Branco
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