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1.

Background

This study was designed to evaluate the efficacy of DL-selenomethionine (DL-SeMet) supplementation on growth performance, antioxidant status, plasma selenium (Se) concentration, and immune function of weaning pigs. 216 weaning pigs were randomly allocated to 6 treatments with 6 replicates each according to a complete randomized block design. Each replicate had six pigs. Diet of group one was corn-soybean basal diet without any additional Se supplement. Group 2 was supplemented with 0.3 mg/kg of Se from sodium selenite. Groups 3-6 were supplemented with 0.1, 0.3, 0.5, and 0.7 mg/kg of Se from DL-SeMet, respectively. The trial lasted for 42 days.

Results

Pigs supplemented with 0.3 and 0.7 mg/kg DL-SeMet obtained better feed gain ratio (P < 0.05). The best antioxidant ability (serum, liver, and muscle) was shown in 0.1-0.3 mg/kg DL-SeMet groups (P < 0.05). The plasma Se concentration increased as the dietary DL-SeMet level elevated. The immunity among groups was not affected.

Conclusions

DL-SeMet supplementation in the diet significantly improved the growth performance, antioxidant ability and plasma Se content of weaning pigs. DL-SeMet can replace sodium selenite in the diet of weaning pigs.  相似文献   
2.
硒代蛋氨酸对肥育猪生产性能和肉品质的影响   总被引:7,自引:0,他引:7  
本试验旨在研究硒代蛋氨酸对肥育猪生产性能和肉品质的影响.选用64头体重约60 kg的杜×长×大三元杂交肥育猪,随机分为4个处理,各处理饲粮中分别添加0(空白对照组)、0.15和0.30 mg/kg硒代蛋氨酸硒、0.30 mg/kg亚硒酸钠硒,试猪体重达95 kg左右结束试验.结果表明:1)饲粮添加不同水平硒代蛋氨酸或亚硒酸钠均未改善肥育猪平均日增重、平均日采食量、料重比(P>0.05);2)饲粮添加不同水平硒代蛋氨酸或亚硒酸钠均未显著影响肥育猪背最长肌剪切力、肌内脂肪含量和滴水损失(P>0.05);各硒处理宰后12 h背最长肌pH均显著高于对照组(P<0.05);与对照组相比,添加硒代蛋氨酸或亚硒酸钠显著降低了宰后不同时间点肉色亮度(L*)值(P<0.05),提高了肉色红度(α*)值(P<0.05),0.15 mg/kg硒代蛋氨酸硒处理也显著降低了宰后12 h肉色黄度(b*)值(P<0.05);3)添加0.30 mg/kg硒代蛋氨酸硒显著降低了背最长肌中乳酸含量(P<0.05);0.30 mg/kg硒代蛋氨酸硒处理和0.30 mg/kg亚硒酸钠硒处理的氧合肌红蛋白含量均极显著高于对照组(P<0.01)和显著高于0.15 mg/kg硒代蛋氨酸硒组(P<0.05).以上试验结果提示,在肥育猪日粮中添加0.15~0.30 mg/kg硒代蛋氨酸硒对改善猪肉肉色十分有利.  相似文献   
3.
Near simultaneous exposure to selenium and salinity stress is an environmental reality faced by white sturgeon juveniles in the San Francisco Bay-Delta, having the potential for adverse synergistic impacts on juveniles during seaward migration. White sturgeon juveniles (36–132 g) were transferred into higher salinities (15–20 ppth) after exposure to dietary selenium (0.4, 9.6, 20.5, 41.7, 89.8, or 191.1 μg Se/g diet) in the form of l-selenomethionine (SeMet) for 8 weeks in freshwater (0 ppth). White sturgeon fed above 41.7 μg Se/g diet experienced significant (P < 0.05) declines in survival relative to sturgeon fed between 0.4 and 41.7 μg Se/g diet when transferred into brackish water (15 ppth salinity) for 3 days. Plasma osmolality and ionic concentrations in white sturgeon after abrupt transfer correlated positively with dietary Se concentrations. Transfer of white sturgeon fed above 41.7 μg Se/g diet into 20 ppth brackish water for 1 day resulted in significant declines in survival relative to white sturgeon fed 0.4–41.7 μg Se/g diet. Hematocrit and dehydrational weight loss were significantly correlated with dietary Se concentrations while plasma osmolality and ion concentrations were not. The transfer of sturgeon into 20 ppth water for 3 days resulted in severe survival declines in all treatment groups. The results of this study suggest that the previously established threshold for Se toxicity (10–20 μg Se/g) is sufficient to protect white sturgeon from the adverse interactive affects resulting from increases in dietary Se and ambient water salinity.  相似文献   
4.
日粮中不同硒源对鸡蛋硒含量的影响   总被引:2,自引:0,他引:2  
王兴华  张旋 《山东农业科学》2012,44(12):93-96,99
将130日龄海兰蛋鸡324只随机分成9组,1组为对照组,饲以基础日粮;2、3、4、5组在基础日粮中添加0.2、0.4、0.6、0.8 mg/kg硒的亚硒酸钠;6、7、8、9组在基础日粮中添加0.2、0.4、0.6、0.8 mg/kg硒的硒代蛋氨酸,自由饮水。采用氢化物-火焰原子吸收法测定鸡蛋中硒的含量。结果显示,日粮中添加不同浓度亚硒酸钠和硒代蛋氨酸后对蛋鸡体重、产蛋量和蛋重均无显著影响(P>0.05),但对日均采食量有显著影响(P<0.05);与对照相比,鸡蛋中硒含量显著提高(P<0.01),硒代蛋氨酸对鸡蛋中硒含量的影响极显著高于亚硒酸钠(P<0.01);各试验组7~28天期间鸡蛋硒含量逐渐升高,28~56天鸡蛋硒含量无显著变化(P>0.05);饲料中添加0.8 mg/kg硒的硒代蛋氨酸,鸡蛋硒含量达0.938μg/g,表明饲料中添加硒代蛋氨酸优于亚硒酸钠。  相似文献   
5.
万亚男  罗章  王晓芳  王琪  余垚  郭岩彬  李花粉 《土壤》2018,50(6):1176-1181
通过基质栽培试验,研究了硒酸钠、亚硒酸钠和硒代蛋氨酸(0~0.8 mg/kg)对金针菇(Flammulina velutipes)吸收和富集硒的影响。结果表明,外源硒的添加显著增加了金针菇原基和子实体的硒含量,且硒含量均随硒添加浓度的上升而显著增加。在相同硒浓度水平下,3种外源硒对金针菇子实体硒含量的增加效果为亚硒酸钠硒代蛋氨酸硒酸钠:施硒量为0.8 mg/kg时,3种硒处理下金针菇子实体的硒含量分别为0.24、0.12和0.08 mg/kg。此外,亚硒酸钠处理下金针菇子实体和原基的硒回收率大于硒代蛋氨酸和硒酸钠处理。且随着硒添加浓度的增加,硒代蛋氨酸和硒酸钠处理下子实体硒的回收率显著下降:分别从14.28%逐渐降低到6.33%和从13.67%减少到3.70%;而添加硒酸钠时,硒的回收率随添加浓度的增加无显著变化。  相似文献   
6.
The effect of sodium selenite addition and fermentation times on production of selenomethionine (SeM) during sponge bread production was evaluated. Doughs were supplemented with sodium selenite (Na2SeO3) and fermented with yeast, avoiding addition of sulfur salts. The effect of Na2SeO3 on yeast activity was evaluated using a pressurometer. Results showed that there were not statistical differences (p < 0.05) in CO2 production and dough pH at all the sodium selenite concentrations tested. HPLC-fluorescence data showed that SeM production was higher with the increase of fermentation times, while less significant effects were observed due to changes in Na2SeO3 concentration. Two slices of Se-enriched bread can provide about 200 μg SeM, the dose recommended to prevent cancer and oxidative stress. The physical features (water absorption, bread weight, bread volume, color, density, oven spring, etc.) and organoleptic evaluations for the enriched loaves were evaluated. In all these parameters, the experimental enriched breads had practically identical attributes compared to the control. The breads rich in SeM have potential to be used as functional foods because this amino acid is synthesized into higher quantities of glutathione peroxidase, an enzyme considered as one of the most protective mechanisms against oxidative stress and preventive of cancer and chronic diseases.  相似文献   
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