饲喂鸡肝对幼猫骨骼代谢的影响

本实验选取50日龄左右健康短毛家猫20只,分为两组,每组10只,一组饲喂猫粮,另一组饲喂鸡肝,研究饲喂鸡肝对幼猫骨骼代谢的影响。实验结果表明:饲喂鸡肝可对幼猫的骨骼代谢产生明显影响。在饲喂到60天和90天时,鸡肝组幼猫血清中的钙含量比猫粮组幼猫极显著偏低(P<0.01);在饲喂期间,鸡肝组幼猫血清中碱性磷酸酶(AKP)活性升高,在30天时两组间差异显著(P<0.05),在60天和90天时两组差异极显著(P<0.01);在饲喂到50天时,鸡肝组幼猫甲状膀腺激素(PTH)分泌显著增加,与猫粮组幼猫相比差异显著(P<0.05),但在85天时,其PTH分泌减少,与猫粮组幼猫相比差异显著(P<0.05);在50天和85天时,鸡肝组幼猫血清骨钙素(BGP)含量下降,但与猫粮组幼猫相比差异不显著(P>0.05);在85天时,鸡肝组幼猫血清降钙素(CT)分泌增加,与猫粮组相比差异极显著(P<0.01);同时鸡肝组幼猫在饲喂到85天时血清25-OH-D3含量下降,与猫粮组幼猫相比差异显著(P<0.05);在饲喂到90天时,鸡肝组幼猫股骨长度极显著低于猫粮组(P<0.01)。     

饲喂鸡肝对幼猫体重和生化指标的影响

随着宠物热在我国的兴起 ,家庭养猫的数量急剧上升 ,在现阶段 ,国内宠物猫营养代谢有关的疾病明显增多。长期以鸡肝作为主要日粮饲喂幼猫 ,导致幼猫发生相关代谢性疾病是目前临床幼猫就诊的主要疾病之一。本试验采用以鸡肝为主的日粮饲喂幼猫 ,旨在观察和研究鸡肝对幼猫体重和血液生化指标的影响。1　材料与方法1 .1　实验动物及分组　选取 5 0日龄左右健康短毛家猫 2 0只 ,随机分为两组 ,每组各 1 0只 ,分别饲喂幼猫猫粮和饲喂鸡肝加米饭。1 .2　实验日粮　对猫粮组饲喂皇家幼猫猫粮( ROYAL CANIN GROWTH CAT FOOD) ,其具体成分…     

含有不同风味增强剂的猫粮对临清狮猫的采食特性、消化率及血清指标的影响

为研究添加不同风味增强剂的宠物猫粮对临清狮猫的采食特性、消化特性及血液指标的影响，本试验以鸡肝(CL)、牛肝(BL)及两者混合后加入焦磷酸盐(SP)制作三种诱食剂产品，均匀喷涂在基础猫粮中，同时设置无风味增强剂的猫粮作为空白对照组。选择40只临清狮猫进行饲养试验，每组10只试验猫。饲喂四种不同的试验猫粮。试验期30d，测定采食量、饮水量，同时收集粪便和血液测定表观消化率和血液指标。结果表明：牛肝组试验猫的采食量相较于对照组、焦磷酸组、鸡肝组采食量分别高出46.4%、10.6%、11.3%(P<0.05)。焦磷酸组、鸡肝组、牛肝组试验猫单位代谢体重(BW^0.67)下采食量较对照组采食量分别提高30.4%、27.4%、45.7%(P<0.05)。焦磷酸组、鸡肝组、牛肝组试验猫单位代谢体重下饮水量相较于对照组试验猫分别提高16.8%、16.9%、31.4%(P<0.05)。牛肝组的试验猫单位代谢体重(BW^0.67)下饮水量相较于焦磷酸组和鸡肝组分别提高12.5%、12.4%(P<0.05)。焦磷酸组、鸡肝组、牛肝组的粗蛋白质...     

黄芪、山药和山楂对幼猫生长性能、毛发、抗氧化、免疫指标及肠道菌群的影响

试验旨在研究黄芪、山药和山楂对幼猫生长性能、毛发质量、粪便性状、血清抗氧化、免疫指标，及肠道菌群的影响。选取18只45～60日龄的幼猫，随机分为3组，每组6个重复，每个重复1只猫。空白对照组（H组）幼猫饲喂基础幼猫粮，试验对照组（R组）幼猫饲喂市售幼猫粮，试验组（T组）在基础幼猫粮中添加0.2%黄芪、0.2%山药、0.2%山楂。试验期30 d。结果显示，T组幼猫平均日增重高于H组和R组，料重比低于H组（P>0.05）。T组幼猫毛鳞片厚度和贴服度更高。T组幼猫血清谷胱甘肽过氧化物酶（GSH-Px）活性显著高于R组（P<0.05）。T组幼猫粪便评分高于H组和R组（P>0.05），肠道菌群丰富度更高，菌群结构更相似。研究表明，幼猫粮中添加黄芪、山药和山楂可改善幼猫生长性能、粪便性状、毛发质量、抗氧化能力和免疫能力，优化肠道菌群结构，更利于幼猫健康成长。     

含有不同风味增强剂的猫粮对临清狮猫采食特性的影响

为了研究不同风味增强剂猫粮对宠物猫采食特性的影响,试验将三种不同原料成分的风味增强剂(鸡肝、牛肝及牛肺及其他原料)喷涂在猫粮上,并将30只临清狮猫随机分为3组,采用双盆法进行对比饲喂试验,对比3组猫的采食特性。结果表明:宠物猫对含牛肝猫粮的采食量及采食率均最高,含鸡肝猫粮次之。说明含有三种风味增加剂猫粮的适口性排序牛肝鸡肝牛肺。     

宠物食品中以鲜肉替代肉粉对猫粮的适口性、消化率的影响

试验旨在研究在宠物食品中使用30%新鲜鸡肉替代鸡肉粉，以评估鲜肉对猫粮的适口性、营养物质消化率的影响。试验以45%鸡肉粉作为蛋白来源的猫粮为肉粉组，以30%鲜鸡肉等干物质含量替换鸡肉粉作为蛋白来源的猫粮为鲜肉+肉粉组。选择16只健康英国短毛猫进行饲养试验，首先进行为期2 d的适口性评价试验，之后随机分为2个组，每组8只猫，分别饲喂肉粉粮和鲜肉+肉粉粮，正试期30 d，测定采食量、粪便评分、表观消化率和血清生化指标。结果表明：与肉粉组相比，(1)鲜肉+肉粉粮组显著提高了猫粮的适口性（P<0.05）；(2)鲜肉+肉粉组可显著提高猫对干物质、粗蛋白、粗纤维、有机物、钙和总磷的表观消化率（P<0.05）；(3)鲜肉+肉粉组不影响猫的体重、采食量、粪便评分和血清生化指标，表明猫维持在健康的机体状态。综上所述，猫粮中使用30%新鲜鸡肉替换鸡肉粉能够显著提高猫粮的适口性和营养物质的消化率，且保持机体健康。     

猫须草对猫采食、饮水及机体抗氧化和炎性指标的影响

试验旨在研究饲粮中添加猫须草对猫采食、饮水及机体抗氧化和炎性指标的影响。选择24只健康成年宠物猫,根据体重平均分为4组,每组6个重复（公猫2只,母猫4只）,分别在基础日粮中添加0（对照组）、0.5%、1.0%、2.0%的猫须草。适应期7 d,正试期42 d。结果显示：饲粮中添加猫须草对猫体重、平均日采食量和养分消化率无显著影响（P>0.05）。与对照组相比,0.5%、1.0%、2.0%猫须草组第5、6周平均日饮水量显著提高（P<0.05）,血清丙二醛含量显著降低（P<0.05）;0.5%和1.0%猫须草组血清总超氧化物歧化酶活性显著提高（P<0.05）;1.0%猫须草组血清白细胞介素-6水平显著降低（P<0.05）。综上所述,猫粮中添加猫须草可促进猫的饮水,改善机体抗氧化和抗炎能力,提示猫须草有增加猫排尿量、减少泌尿系统疾病的潜在作用,添加量为1.0%时饲喂效果较好。     

饲料添加番茄红素对猫机体抗氧作用的影响研究

为探讨猫粮中添加番茄红素对猫机体抗氧化性能的影响,本研究选择48只成年猫,随机分为4组,每组4个重复,每个重复3只,分别饲喂基础猫粮（Ⅰ组-对照组）,基础猫粮+25 mg番茄红素（Ⅱ组）,基础猫粮+50 mg番茄红素（Ⅲ组）和基础猫粮+100 mg番茄红素（Ⅳ组）。正式试验期共30 d,分别在试验第0天（D0）、第10天（D10）、第20天（D20）和第30天（D30）4个时间位点,检测血清中超氧化物歧化酶（SOD）活性、谷胱甘肽过氧化物酶（GSH-Px）活性、丙二醛（MDA）的含量。试验结果显示：在D30位点,番茄红素各试验组的猫血清SOD活性和GSH-Px活性上升,MDA含量降低。（1）与对照组相比,SOD活性分别提高13.5%、44.8%、46.1%;GSH-Px活性提升12.4%、40.3%、41.8%;MDA含量下降明显,数值分别为14.9%、32.7%、35.2%,在统计学上差异均有显著性（P <0.05）,说明番茄红素可以提高猫机体的抗氧化能力;（2）Ⅳ组和Ⅲ组相比,SOD和GSH-Px活性提高,MDA含量降低,在统计学上没有显著性差异（P> 0.05）,但均...     

含有酵母提取物的猫粮对临清狮猫的适口性试验

酵母提取物具有浓郁的风味,可以作为宠物诱食剂的原料之一。本试验旨在研究不同诱食剂配方的猫粮对宠物猫的适口性影响。将不含任何酵母提取物、毕赤酵母提取物及啤酒酵母提取物的三种诱食剂喷涂与猫粮中。选择30只临清狮猫,随机分为3组。进行双盆法对比饲喂试验,饲喂以上三种猫粮。研究表明,不同诱食剂配方的猫粮对宠物猫的采食量有显著影响。含有酵母提取物的宠物猫的采食量及采食率显著高于无酵母组(P<0.05)。但是含有毕赤酵母提取物和啤酒酵母提取物的猫粮的单位体重采食量及采食率没有显著差异(P>0.05)。综上所述,三种含有诱食剂的猫粮的适口性由大到小排序分别为啤酒酵母提取物>毕赤酵母提取物>无酵母提取物。     

血球蛋白粉和水解羽毛粉在犬猫粮上的应用研究

本试验旨在探讨在犬猫粮中添加血球蛋白粉与水解羽毛粉对犬猫采食量和体重变化的影响以及对犬猫粮各营养物质表观消化率和适口性的影响。本试验分为两部分,试验Ⅰ:犬对照组饲喂基础日粮1,试验1组、试验2组分别饲喂在基础日粮1中添加6%血球蛋白粉的试验1粮和添加6%水解羽毛粉的试验2粮;猫对照组饲喂基础日粮2,试验3组、试验4组分别饲喂在基础日粮2中添加6%血球蛋白粉的试验3粮和添加6%水解羽毛粉的试验4粮,预饲期7d,正式试验期28d;试验Ⅱ:健康贵宾犬,分3批次做适口性对比试验;健康英国短毛猫,分3批次做适口性对比试验。试验结果显示,犬猫粮中添加6%血球蛋白粉,其粗蛋白表观消化率、犬猫体重方面有所提高,但其适口性显著降低,显然血球蛋白粉要用作犬猫粮的动物蛋白质原料,应解决其适口性差的问题;添加6%水解羽毛粉时,其干物质、粗蛋白和有机质的表观消化率和适口性显著降低,犬猫体重显著下降,显然水解羽毛粉不适宜用作犬猫粮的动物蛋白质原料。     

Accumulation of mercury and selenium in tissues of kittens fed commercial cat food

Six kittens, three males and three females, were fed exclusively for one hundred days a commercially canned red meat tuna found to contain elevated concentrations of Mercury (Hg) and Selenium (Se). A similarly sized control group was fed for the same period a dry commercial cat food comparatively low in the concentration of these elements. At the end of the feeding trial, concentrations of Hg Se were markedly higher in blood, bone, brain, kidney, liver, muscle and spleen of the kittens fed the tuna diet as compared to the corresponding controls. No behavioral abnormalities or pathological lesions were detected in any of the kittens.     

Use of adult cat serum to correct failure of passive transfer in kittens.

OBJECTIVE: To evaluate the use of adult cat serum as an immunoglobulin supplement in kittens with failure of passive transfer. DESIGN: Randomized controlled study. ANIMALS: 11 specific pathogen-free queens and their 43 kittens. PROCEDURE: Kittens were removed from the queens at birth, prior to suckling colostrum, and randomly assigned to 1 of 4 groups: colostrum-deprived, colostrum-fed, colostrum-deprived and administration of pooled adult cat serum i.p., and colostrum-deprived and administration of pooled adult serum s.c.. Colostrum-fed kittens were returned to the queen and allowed to suckle normally. Colostrum-deprived kittens were isolated from the queen and fed a kitten milk replacer for 2 days to prevent absorption of colostral IgG. All colostrum-deprived kittens were returned to the queen on day 3. Serum IgG concentrations were measured by radial immunodiffusion in the kittens at birth and 2 days and 1, 2, 4, 6, and 8 weeks after birth. RESULTS: None of the kittens had detectable serum IgG at birth. Both i.p. and s.c. administration of adult cat serum resulted in peak serum IgG concentrations equivalent to those in kittens that suckled normally. Untreated colostrum-deprived kittens did not achieve serum IgG concentrations comparable to those for kittens in the other groups until 6 weeks of age. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggest that adult cat serum may be used as an immunoglobulin supplement in colostrum-deprived kittens. Although the minimum concentration of IgG necessary to protect kittens from infection is unknown, concentrations achieved were comparable to those in kittens that suckled normally.     

Immunoglobulin concentrations in feline colostrum and milk, and the requirement of colostrum for passive transfer of immunity to neonatal kittens

The purpose of this study was to clarify whether cats have a colostral and milk phase of lactation differentiated by concentrations of immunoglobulins, and whether colostrum ingestion by newborn kittens is essential for optimal transfer of passive immunity. Milk from specific pathogen-free queens was analyzed for IgG and IgA concentrations from parturition through 6 weeks of lactation. Serum IgG and IgA concentrations from birth through 8 weeks of age were determined for colostrum-fed kittens, colostrum-deprived kittens that were fed a milk replacer, and colostrum-deprived kittens that were fostered onto queens in the milk phase of lactation. The total IgG and IgA concentrations in milk were significantly higher on the day of parturition than on day 7 of lactation, indicating cats do have a colostral phase of lactation. The predominant immunoglobulin in both colostrum and milk was IgG. The serum IgG concentrations in colostrum-deprived kittens fostered on queens in the milk phase of lactation were similar to colostrum-deprived kittens fed a milk replacer, and the concentrations were significantly lower than in colostrum-fed kittens for the first 4 weeks of life. The serum IgA concentrations in both colostrum-deprived groups were significantly lower than colostrum-fed kittens on day 2 after parturition, but were similar thereafter. Colostrum-deprived kittens fostered onto queens in the milk phase of lactation had failure of passive transfer of maternal antibodies. Protective concentrations of immunoglobulins can be restored in kittens with failure of passive transfer of immunity by parenteral administration of adult cat serum, but not by fostering on queens in mid-lactation.     

镰刀菌毒素污染饲粮导致的断奶仔猪肝脏损伤与自然修复研究

本试验旨在研究阶段性饲喂镰刀菌毒素污染饲粮对仔猪血清和肝脏生化指标、抗氧化指标以及肝脏炎性细胞因子白细胞介素-1β(IL-1β)、白细胞介素-6(IL-6)mRNA相对表达量的影响。选用体重为(8.45±0.94)kg的35日龄"杜×长×大"雌性仔猪30头,随机分为3组,每组10个重复,每个重复1头猪。对照组持续饲喂基础饲粮,镰刀菌毒素组持续饲喂镰刀菌毒素污染饲粮(玉米赤霉烯酮0.90 mg/kg,呕吐毒素1.43 mg/kg,烟曲霉毒素5.85 mg/kg),自然恢复组在饲喂镰刀菌毒素污染饲粮35 d后,改饲喂基础饲粮。预试期7 d,正试期56 d。结果表明:1)与对照组相比,镰刀菌毒素组仔猪肝脏相对重量显著升高(P0.05),血清谷丙转氨酶(ALT)、谷草转氨酶(AST)和碱性磷酸酶(ALP)活性显著升高(P0.05),血清总蛋白(TP)和球蛋白(GLB)含量显著降低(P0.05),血清谷胱甘肽过氧化物酶(GSH-Px)、血清和肝脏总超氧化物歧化酶(T-SOD)活性显著下降(P0.05),血清和肝脏丙二醛(MDA)含量显著升高(P0.05);肝脏炎性细胞因子IL-1β和IL-6 mRNA相对表达量显著升高(P0.05)。2)经21 d自然恢复后,与镰刀菌毒素组相比,自然恢复组仔猪肝脏相对重量有所降低(P0.05),血清AST、ALT和ALP活性显著降低(P0.05),血清TP和GLB含量显著升高(P0.05),血清T-SOD活性显著升高(P0.05),血清和肝脏GSH-Px、肝脏T-SOD活性有所升高(P0.05),血清和肝脏M DA含量显著降低(P0.05),肝脏炎性细胞因子IL-1β和IL-6 mRNA相对表达量显著降低(P0.05)。由此可见,本试验条件下,长期饲喂镰刀菌毒素能够造成仔猪肝脏损伤,影响肝脏的抗氧化、蛋白质合成和免疫功能,而经过21 d恢复期,仔猪肝脏抗氧化和免疫功能得到了一定程度的改善。     

Progression of aflatoxicosis in growing barrows

The progression of aflatoxicosis was evaluated in growing crossbred barrows given 0, 1, 2, 3, or 4 mg of aflatoxin (AF)/kg of feed for 28 days (6 to 10 weeks of age). On day 28, pigs were euthanatized and necropsied, and tissues were removed for histologic examination. Body weight gains were decreased in barrows fed 2 mg of AF/kg after 7 days and in barrows fed 1 mg of AF/Kg after 14 days. By 28 days, all barrows fed AF had decreased body weights and weight gains. Compared with decreased in all barrows fed AF. Neither liver weights nor bone ash values were altered, although liver lipid values were increased in barrows fed AF. Serum aspartate transaminase, gamma-glutamyl transferase, and alkaline phosphatase activities were increased in barrows fed AF, whereas creatine kinase activity was decreased. Aflatoxin diets resulted in decreases in serum concentrations of urea nitrogen, phosphorus, cholesterol, albumin, and total protein. Histologic alterations in liver included interlobular fibrosis, periportal lipidosis, bile duct hyperplasia, and periportal lymphocytic infiltration. Lymphocytes in the thymus were depleted, and numbers of granulocytic cells in the bone marrow were reduced. The frequency and severity of lesions increased with increased doses of AF.     

Effect of diet on Heinz body formation in kittens

Heinz body formation was examined in kittens, in response to consumption of a variety of diets. A commercial salmon-based diet containing 16.5 mg of nitrite, 39 mg of histamine, and 210,000 IU of vitamin A/kg of diet (dry-matter basis) was found to induce Heinz body formation. Purified experimental diets--containing nitrite up to 405 mg/kg; histamine, 50 mg/kg; histamine 50 mg/kg plus nitrite, 45 mg/kg; or vitamin A, 250,000 IU/kg--failed to induce Heinz body formation. The effect of propylene glycol (PG) on Heinz body formation was examined by giving groups of 6 kittens purified diets containing 5 or 10% PG for 12 weeks. Two additional kittens were fed a commercial soft-moist diet containing PG for 12 weeks. All kittens fed PG developed Heinz bodies, with peak values for erythrocytes containing Heinz bodies being: 28% for kittens of the 10% PG group; 20% for kittens of the 5% PG group; and 36% for kittens of the soft-moist diet group. Kittens did not develop anemia or methemoglobinemia. Heinz body percentage required 6 to 8 weeks to decrease to the pretreatment value of less than 1% after diets containing PG were discontinued. 51Chromium-labeled erythrocytes were used to evaluate erythrocyte survival in 4 kittens of the 10% PG-fed group and in 4 control kittens. Kittens with Heinz body formation induced by 10% PG had significantly (P less than 0.001) decreased erythrocyte-survival, compared with that for controls, with half-life of 8.3 days for kittens of the PG group, compared with 12.6 days for kittens of the control group.     

饲粮卵磷脂添加水平对肉鸡生长性能、屠宰性能、肝脏营养成分及肝脏和血清生化指标的影响

本试验旨在研究饲粮卵磷脂添加水平对肉鸡生长性能、屠宰性能、肝脏营养成分及肝脏和血清生化指标的影响。选取体重一致的1日龄爱拔益加(AA)肉仔鸡500只,随机分成5个组,每组10个重复,每个重复10只鸡。对照组饲喂基础饲粮,试验组在基础饲粮中分别添加500、1000、1500和2000 mg/kg卵磷脂。试验期42 d。结果表明:1)随着饲粮卵磷脂添加水平的增加,21和42日龄肉鸡平均体重呈二次曲线升高(P<0.05)。2)随着饲粮卵磷脂添加水平的增加,42日龄肉鸡半净膛率和全净膛率呈线性和二次曲线升高(P<0.05),42日龄肉鸡腿肌率呈线性升高(P<0.05)。3)随着饲粮卵磷脂添加水平的增加,21日龄肉鸡新鲜样本基础和干物质基础上肝脏有机物含量呈线性和二次曲线升高(P<0.05或P<0.01),42日龄肉鸡新鲜样本基础和干物质基础上肝脏有机物和粗脂肪含量均呈线性和二次曲线升高(P<0.05或P<0.01)。4)随着饲粮卵磷脂添加水平的增加,21日龄肉鸡肝脏总胆固醇含量呈线性升高(P<0.05),42日龄肉鸡肝脏甘油三酯含量呈线性和二次曲线升高(P<0.01)。5)与对照组相比,饲粮添加1000、1500和2000 mg/kg卵磷脂显著降低了21和42日龄肉鸡血清甘油三酯含量(P<0.05),饲粮添加2000 mg/kg卵磷脂显著降低21和42日龄肉鸡血清尿素氮含量(P<0.05)。随着饲粮卵磷脂添加水平的增加,21日龄肉鸡血清低密度脂蛋白、甘油三酯和总胆固醇含量呈线性降低(P<0.05),42日龄肉鸡血清甘油三酯含量呈线性和二次曲线降低(P<0.05)。由此可见,饲粮添加卵磷脂能够提高肉鸡生长性能和屠宰性能,调节肝脏和血清脂质代谢,降低血清尿素氮含量。以肉鸡平均体重为判断指标,推荐1~21日龄和22~42日龄肉鸡基础饲粮中卵磷脂添加水平分别为952和1246 mg/kg。     

大豆异黄酮抗霉变饲料对肉鸡的影响及机制

将150只8日龄艾维茵肉仔鸡随机分成5个处理组,每个处理组5个重复,每次重复6只鸡。处理1组饲喂正常饲粮(阳性对照),处理2组为10%霉变玉米替代处理1组中正常玉米(阴性对照),处理3、4、5组分别在处理2组基础上添加100、200 mg/kg的大豆异黄酮和0.05%的膨润土。结果显示,与阳性对照组比较,处理2组显著地降低了肉鸡的采食量、日增重,增加了料肉比(P<0.05);显著地提高了血清中AST、ALT、AKP和LDH的浓度(P<0.05);同时降低了肝脏和血清中GSH-PX、SOD的活性(P<0.05)。大豆异黄酮和膨润土的添加显著地提高了肉鸡采食量、日增重(P<0.05),降低了料肉比(P<0.05);同时降低了血清中AST、ALT、AKP和LDH的浓度(P<0.05);大豆异黄酮的添加还显著地提高了肝脏和血清中GSH-PX、SOD的活性(P<0.05)。结果表明,大豆异黄酮显著地抑制了霉菌毒素对肉鸡肝功能和生长性能的影响。     

饲粮镁对肉仔鸡生长、组织镁浓度及抗氧化功能的影响

研究比较了天门冬氨酸镁和氧化镁对肉仔鸡镁营养状态及肝脏和脾脏等组织抗氧化酶能力的影响。将252只1日龄的AA肉仔鸡随机分为7个处理组,每个处理6个重复,每个重复6只鸡。天门冬氨酸镁和氧化镁的添加水平为0.9、1.8、2.7g/kg日粮,基础日粮组作为不添加镁的对照组。日粮中添加镁能显著提高血清、肝脏和脾脏中的镁浓度(P<0.01),天门冬氨酸镁比氧化镁更能有效地提高血清和肝脏中的镁含量(P<0.01)。肝脏过氧化氢酶(CAT)的活性,随天门冬氨酸镁添加量的增加线性增加(P<0.01),随氧化镁添加量的增加呈二次曲线增加(P<0.05)。天门冬氨酸镁比氧化镁更有效地增强肝脏中CAT的活性(P<0.01)。脾脏CAT的活性随天门冬氨酸镁(P<0.05)或氧化镁(P<0.01)添加量的增加线性增加。肝脏(P<0.05)和脾脏(P<0.01)丙二醛MDA的浓度随氧化镁或天门冬氨酸镁添加量的增加线性降低。天门冬氨酸镁比氧化镁更有效地降低肝脏中的MDA浓度(P<0.01)。结果表明:日粮中添加镁能显著改善肉仔鸡各种组织中镁的含量,并能提高肝脏和脾脏等组织中抗氧化酶的活性,降低脂质过氧化水平。     

A low-selenium diet increases thyroxine and decreases 3,5,3'triiodothyronine in the plasma of kittens

The effect of a low-selenium diet on thyroid hormone metabolism was investigated in growing kittens. Twelve specific-pathogen-free kittens with ages ranging from 16 to 18 weeks were divided into two groups of equal number with equal sex distribution in each group. One group was fed a yeast-based low-selenium diet (0.02 mg Se/kg diet) while the other group was fed the same diet supplemented with Na₂SeO₃ at 0.4 mg Se/kg diet for 8 weeks. Food intake, body weight and body weight gain were not affected by the low-Se diet during the study period. However, kittens given the low-Se diet had significantly reduced plasma selenium concentration and glutathione peroxidase activity. Plasma total thyroxine (T4) increased and total 3,5,3'triiodothyronine (T3) decreased significantly in kittens fed the low-Se diet at the end of the study. These results suggest that type I deiodinase in cats is a selenoprotein- or a selenium-dependent enzyme.