Influência do regime alimentar sobre os parâmetros de crescimento de borregas merinas.

O presente trabalho teve por objetivo avaliar o efeito que três suplementos alimentares (alimento composto comercial (CP), farinha forrageira de milho (FM) e cladódios de Opuntia ficus-indica (OFI)) tiveram sobre os indicadores de crescimento de borregas de substituição de raça Merino Branco alimentadas com feno de consociação (F), como alimento forrageiro base em regime ad libitum controlado, assim como a ingestão de água. Os 24 animais selecionados foram organizados em grupos de 8 borregas cada um, homogéneos em relação ao peso vivo, à idade e ao ganho de peso médio diário do nascimento até ao início do ensaio. Cada grupo de 8 borregas foi organizado em quatro subgrupos de 2 borregas cada um e o controlo da ingestão alimentar foi feito para cada um destes subgrupos. Para cada tratamento avaliou-se os seguintes parâmetros de crescimento e de consumo de alimentos: peso vivo; ganho de peso diário; consumo de feno (MS); consumo de cada um dos suplementos alimentares (MS); consumo de MS/kg0,75; consumo de PB/kg0,75; consumo de EM/kg0,75; consumo de NDF/kg0,75; consumo de NFC/kg0,75; índice de conversão alimentar (kg MS/kg PVG); consumo de água; ingestão total de água. Durante os 63 dias de ensaio, verificou-se que as borregas submetidas ao regime alimentar CP+F (T1) apresentaram maior ingestão (p≤0,05) de MS, MS/kg PV0,75, C, NDF, ADF, PB, PB/kg PV0,75, GB, EM e H2O e menor ingestão (p≤0,05) de NFC e de NFC/kg PV0,75. No regime alimentar FM+F (T2), verificou-se maior ingestão (p≤0,05) de NFC/kg PV0,75 e menor ingestão (p≤0,05) de C. No regime alimentar OFI+FM+F (T3) as borregas ingeriram menos (p≤0,05) NDF, PB/kg PV0,75 e H2O. Não se encontraram diferenças estatísticas significativas entre os tratamentos T2 e T3 relativamente à ingestão média diária de MS, de EM, de PB, de NDF e de ADF (p≤0,05). O maior consumo de H2O foi apresentado no T1 (2,037 kg/dia) (p≤0,05), seguido das borregas do T2 (1,459 kg/dia). O menor consumo médio diário de H2O de bebida ocorreu nas borregas do T3 (0,277 kg/dia ±0,038) (p≤0,05), no entanto as borregas do T3 apresentaram o maior CTH2O (3,900 kg/dia) (p≤0,05). As borregas do T1 apresentaram GPD significativamente mais elevado (0,180 kg/dia ±0,009) (p≤0,05) do que as borregas do T2 e T3 (0,110 kg/dia ±0,020 e 0,131 kg/dia 0,006 respetivamente). No final do ensaio, as borregas do T3 alimentadas com OFI+FM+F apresentaram PV semelhante (29,5 kg; p≤0,05) às borregas do T2 alimentadas com FM+F (27,94 kg), porém inferiores (p≤0,05) às borregas do T1 alimentadas com CP+F (33,01 kg). Considera-se que a baixa concentração proteica dos 2 regimes alimentares OFI+FM+F (85,54 g PB/kg MS ±0,560) e FM+F (84,76 g PB/kg MS ±0,367) terá afetado o crescimento dos animais relativamente aos animais alimentados com CP+F (148,62 g PB/kg MS ±2,914).The objective of this study was to evaluate the effect of three feed supplements (commercial compound (CC), corn flour (CF) and Opuntia ficus-indica (OFI) cladodes) on the growth indicators of Merino Branco female lambs, fed as forage with hay (H) of association based on controlled ad libitum regime, as well water intake. The 24 animals selected were organized in groups of 8 lambs each, homogeneous in relation to live weight, age and average daily weight gain from birth until the beginning of the test. Each group of 8 lambs was organized in four subgroups of 2 lambs each and the food intake control was done for each of these subgroups. For each treatment the following growth and food consumption parameters were evaluated: live weight; daily weight gain; hay consumption (DM); consumption of each dietary supplements (DM); consumption of DM/kg0,75; consumption of CP/kg0,75; consumption of ME/kg0,75; consumption of NDF/kg0,75; consumption of NFC/kg0,75; feed conversion index (kg DM/kg DWG); water consumption; total water intake. During the 63 test days, it has been found that lambs submitted on the diet CC+H (T1) presented the highest intake (p≤0.05) of DM, DM/kg LW0,75, A, NDF, ADF, CP, CP/kg LW0,75, CF, ME and H2O, and the lowest intake (p≤0.05) of NFC and NFC/kg LW0,75. In the CF+H diet (T2), it was verified the highest intake (p≤0.05) of NFC/kg LW0,75 and the lowest intake (p≤0.05) of A. In the OFI+CF+H diet (T3) the lambs ingested less (p≤0.05) NDF, CP/kg LW0,75 and H2O. No statistically significant differences were found between treatments T2 and T3 in relation to the mean daily intake of DM, ME, CP, NDF and ADF (p≤0.05). The T1 showed the highest H2O intake (2.037 kg/day) (p≤0.05), followed by the lambs of T2 (1.459 kg/day). The lowest daily H2O intake occurred in the lambs of T3 (0.277 kg/day ±0.038) (p≤0.05), however the lambs of T3 showed the highest TH2OI (3.900 kg/day) (p≤0.05). The lambs of T1 presented significantly higher DWG (0.180 kg/day ±0.009) (p≤0.05) than lambs of T2 and T3 (0.110 kg/day ±0.020 and 0.131 kg/day 0.006 respectively). At the end of the test, the lambs fed with OFI+CF+H (T3) showed a LW similar (29.5 kg; p≤0.05) to the lambs fed with CF+H (T2) (27.94 kg) but lower (p≤0.05) than the animals fed with CC+H (T1) (33.01 kg). It was considered that the low protein concentration of the 2 feed treatments OFI+CF+H (85.54 g CP/kg DM ±0,560) and CF+H (84.76 g CP/kg DM ±0,367) will have affected the growth of the animals compared to animals feed with CC+H (148.62 g CP/kg DM ±2.914)

Modulation of microglia by Wolfberry on the survival of retinal ganglion cells in a rat ocular hypertension model

The active component of Wolfberry (Lycium barbarum), lycium barbarum polysaccharides (LBP), has been shown to be neuroprotective to retinal ganglion cells (RGCs) against ocular hypertension (OH). Aiming to study whether this neuroprotection is mediated via modulating immune cells in the retina, we used multiphoton confocal microscopy to investigate morphological changes of microglia in whole-mounted retinas. Retinas under OH displayed slightly activated microglia. One to 100 mg/kg LBP exerted the best neuroprotection and elicited moderately activated microglia in the inner retina with ramified appearance but thicker and focally enlarged processes. Intravitreous injection of lipopolysaccharide decreased the survival of RGCs at 4 weeks, and the activated microglia exhibited amoeboid appearance as fully activated phenotype. When activation of microglia was attenuated by intravitreous injection of macrophage/microglia inhibitory factor, protective effect of 10 mg/kg LBP was attenuated. The results implicated that neuroprotective effects of LBP were partly due to modulating the activation of microglia