Abstract This study aimed to verify the impact of high-fat diet consumption for a prolonged period on oxidative stress, fetal growth, umbilical vascular system, and placental structures in pregnant goats. Twenty-two pregnant goats were grouped into the control diet (n= 11) and fat diet (n = 11). Flaxseed meal was added to the fat diet, replacing the corn grain of concentrate, from gestational day 100 to delivery date. Diets were isonitrogenous and isoenergetic, differing in fat content (2.8% vs. 6.3% dry matter). The fat group showed higher feed intake and total plasma lipid levels than the control group (P < 0.001). No difference was found in placentome, and umbilical vascular development. Fat diet-fed goats exhibited a lower systolic peak in the umbilical artery. At delivery, placental traits were similar with the exception of the cotyledon width (P = 0.0075), which was smaller in the fat group and cotyledon surface (P = 0.0047) for multiple pregnancy of fat diet. Cotyledonary epithelium showed more intense staining of lipid droplets and a greater area for lipofuscin staining in the fat group compared to control group (P < 0.001). The mean live weight of the kids was lower in the fat group in the first week after delivery than in control group. Thus, in goats, the continuous administration of a high-fat diet during pregnancy does not appear to modify the fetal-maternal vascular structures but has an impact on a part of the placental structure; therefore, its use must be carefully evaluated.

Abstract This study aimed to investigate the effect of growth and differentiation factor 9 (GDF-9) during the in vitro culture of isolated caprine early antral follicles. The isolated and selected early antral follicles were individually cultured for 18 days, and the following treatments were tested: α-MEM+ (control treatment) or α-MEM+ supplemented with 200 ng/mL GDF-9. The following endpoints were evaluated: follicular growth and morphology, estradiol production, oocyte nuclear maturation, and relative expression of key genes related to steroidogenesis (CYP19A1, CYP17, and insulin receptor) and basement membrane remodeling (MMP-9 and TIMP-2). In both treatments, a decrease was observed in the percentage of morphologically intact follicles with a concomitant increase in the rates of extruded and degenerated follicles (P < 0.05). The GDF-9 treatment showed higher rates of extruded follicles only on day 6 of culture (P < 0.05). Follicle diameter increased progressively throughout the culture period (P < 0.05) with similar diameters between treatments at all culture times (P > 0.05). Growth and differentiation factor 9 increased the daily growth rate from the first to the second third of culture, with higher values (P < 0.05) than control in the second third. Oocyte maturation rate as well as estradiol levels and relative mRNA expression for CYP19A1, CYP17, MMP-9, TIMP-2, and insulin receptor genes were similar between treatments (P > 0.05). This study shows for the first time that GDF-9 added to a culture medium increased the follicle growth rate of goat early antral follicles cultured in vitro.

Resumo Este estudo teve como objetivo investigar o efeito do GDF-9 durante o cultivo in vitro de folículos antrais iniciais caprinos isolados. Os folículos antrais iniciais isolados e selecionados foram cultivados individualmente por 18 dias, e os seguintes tratamentos foram testados: α MEM+ (tratamento controle) ou α-MEM+ suplementado com 200 ng/mL de GDF-9 (tratamento GDF-9). Os seguintes parâmetros foram avaliados: crescimento e morfologia folicular, produção de estradiol, maturação nuclear do oócito e expressão relativa de genes-chave relacionados a esteroidogênese (CYP19A1, CYP17 e receptor de insulina) e remodelamento da membrana basal (MMP-9 e TIMP-2). Em ambos os tratamentos, observou-se diminuição na porcentagem de folículos morfologicamente intactos com aumento concomitante nas taxas de folículos extrusos e degenerados (P < 0,05). O tratamento GDF-9 apresentou maiores taxas de folículos extrusos apenas no 6º dia de cultivo (P < 0,05). O diâmetro do folículo aumentou progressivamente ao longo do período de cultivo (P < 0,05) com diâmetros semelhantes entre os tratamentos em todos os tempos de cultivo (P > 0,05). O GDF-9 aumentou a taxa de crescimento diário do primeiro para o segundo terço de cultivo, sendo maior (P < 0,05) que o controle no segundo terço. A taxa de maturação oocitária assim como os níveis de estradiol e a expressão relativa de RNAm para os genes CYP19A1, CYP17, MMP-9, TIMP-2 e receptor de insulina foram similares entre os tratamentos (P > 0,05). Em conclusão, este estudo mostra pela primeira vez que GDF-9 adicionado a um meio de cultivo aumentou a taxa de crescimento de folículos antrais iniciais caprinos cultivados in vitro.