Effect of Phytase Enzyme on Organs Growth Performance and Blood Profile of Broiler

Enzymes which are biological catalyst composed of amino acids with minerals and vitamins. The use of enzymes has many benefits in poultry diets include not only enhanced feed conversion and bird performance but also reduced output of excreta problems of environment. The present research work was conducted to evaluate the effect of phytase enzyme on growth performance and blood profile of broiler. Birds were arbitrarily separated into four groups, i.e. Group A (control) was offered 0 g/kg, 0.05 g/kg (group B), 0.075 g/kg (group C) and 0.025 g/kg (group D) phytase enzyme provided in broiler feed. Parameters which were selected in present research work as, feed intake, live body weight, feed conversion ratio, growth performance and blood profile. Results showed that the maximum chicken body weight was noted in group C and feed intake was minimum in group C, as compared to other groups. Feed conversion ratio was significantly (p < 0.05) higher in group C, followed by other groups the non-significantly variance founded respectively, the highest weight of liver, gizzard, heart, intestine were noted in treated group C comparatively, highest spleen weight was in group B and in group A (control) the minimum weight of spleen was noted and the average blood profile of broiler chicks in different groups, the white blood cells was significantly higher in group D followed by group A, group B and C. Red blood cells was significantly (P < 0.05) better in group C. Haemoglobin was significant differences in different groups of trial. A significant (P < 0.05) difference in Packed cells volume in group A followed by group B, C and D. Total protein in group A was minimum followed by group B, C and D, respectively. From the present study, it was concluded that supplementation of 0.075 g/kg phytase enzyme has a better effect on growth performance and blood profile of broiler.

Effects of Coated Methionine on the Growth Performance, Blood Biochemical Indices and Nutrient Apparent Ileal Digestibility in Broilers

[ Objective] This trial was conducted to study the effects of different coated methionines on the growth performance, blood biochemical indices and apparent ileal digestibility of amino acids in broilers. [ Method ] A total of 3 780 Cobb 500 broilers aged 18 days were randomly arranged into 7 groups with 3 replicates per group and 180 broilers per replicate. Control group （A） received the basal diet supplemented with O. 16% DL-me- thionine, and trial groups received the basal diets supplemented with 0.32% （ B）, 0.29% （ C）, 0.26% （ D）, 0.22% （ E）, 0.19% （F） and 0.16% （G） of coated methionine, and broilers were fed to the age of 42 days. ＂[ Result] The final weight, average daily gain and average daily feed intake of groups B and C were higher than those of the control group （ P〈0.05）, and the mortality of group B was lower than that of the control group （ P 〈0.05）, but there was no significant difference in all above indices between the other groups and the control group （P 〉 0.05）. Plasma GSH-Px activity of trial groups （ except group G） was higher than that of the control group （ P 〈 0.05）, and SOD activity of groups B and C were higher than that of group G （P 〈0.05）, but there were no significant differences in other blood biochemical indices among all groups （P 〉0.05）. There were no significant differences in apparent ileal digestibility of dry matter and crude protein between trial groups and the control group （ P 〉0.05 ）, and the apparent ileal digestibility of amino acids of trial groups was increased （P 〈0.05） or no change expect that the apparent ileal digestibility of many kinds of amino acids of group G was decreased compared with the control group （P〈0.05）. [ Concluslon~ The growth performance and apparent ileal digestibility of amino acids in broilers were increased with the rising supplementation of coated methionine, but the supplementation of 0.19% coated methionine can meet the needs of broilers, namely, coated methionine can be substituted for 60% DL-methionine in the diet, so DL-methio- nine can be saved up to 40%.

Effects of Methenamine Feeding Regime on Growth Performances, Gut Microbiota, Organs Histology and Haemato-Biochemical Profile of Broiler Chickens

Microbial resistance in livestock has become a subject of great concern of public and scientific interest. This study was designed to assess the effects of methenamine feeding regime on growth performances of broilers chickens. For this purpose, 120 chicks of Cobb 500 strain, including 60 males and 60 females of 21 days old with an average weight of 639 g and 584 g respectively were used. They were randomly distributed in 60 experimental units of 2 chicks of same sex per cage until 49 days. Methenamine was incorporated in feed (TA), acidified (TEa) and non acidified (TE) water and compared to an antibiotic medicated diet as positive control (T0+) and a ration without any supplement as negative control (T0). The main results showed that, regardless of the feeding regime, methenamine significantly (p < 0.05) increased feed inteake, body weight, weight gain and decreased (p < 0.05) feed conversion ratio. Methenamine whatever the feeding regime induced a significant increase in lactic acid bacteria counts compared to coliforms and coccidies counts. Salmonella were absent throughout the trial period. Regardless of sex and feeding regime, hematological parameters were not significantly affected, with the exception of white blood cell and platelet concentration that decreased significantly (p < 0.05) in male broilers. Serum content in ASAT (Aspartate-transferase), ALAT (Alanine-transferase), creatinine, urea and LDL-cholesterol decreased significantly (p < 0.05), while HDL-cholesterol increased. Histology of organs was not affected. Feeding methenamine to broiler chickens through drinking water can be used as an alternative to antibiotic to improve growth performances.

Effects of Maternal Dietary Energy Restriction on Fat Deposition of Offspring

The study was carried out to investigate the effects of maternal dietary energy restriction on growth performance, serum indices and fat deposition of offspring. A total of 400 female Arbor Acres （AA） broiler breeders were studied. These female birds involved three experimental treatments and a control group with normal dietary energy diets （ND, 11.7 MJ of ME. kgt during the laying）. In treatments 2, 3 and 4, the energies of diets were 20%, 30% and 50% （LD20, LD30 and LD50） lower than those of the control, respectively. The study commenced at the beginning of the laying period when the total egg production reached 5% of the flock. All the broiler offspring were fed the same diets. The results showed that in low energy diets, offspring showed decreased 1-day-old weight, but 49-day-old weight was higher in LD20 diet （P〈0.05）. For offspring during days 1-49, the average daily gain （ADG） in LD20 group and the feed conversion ratio in LD50 group were improved as compared with those of the control （P〈0.05）. Compared with the control, abdominal fat percentage increased in 49-day-old offspring from LD30 diet （P〈0.05）; the fat content of breast muscle in offspring increased in broilers fed low energy diets （P〈0.05）. In 28-day-old offspring from breeders given LD20 and LD50 diets, liver fat percentages were higher compared with ND （P〈0.05）. The subcutaneous fat thickness in 28-day-old offspring from LD50 group and 49-day-old offspring from LD30 group was higher （P〈0.05）. On day 49, the serum cholesterol （CHO） of offspring from breeders fed LD20 diet and serum high-density lipoprotein （HDL） of offspring from breeders fed LD50 diet reduced compared with those of the control （P〈0.05）. In addition, a higher triiodothyronine （T3） content in serum was found in offspring from broiler breeders given LD20 and LD30 diets （P〈0.05）. Serum thyroxine （T4） in offspring significantly decreased with the decrease of diet energy （P〈0.05）. In conclusion, to a certain extent, dietary energy restriction in breeders could improve growth performance and promote lipid metabolism of offspring.

D-泛酸钙在黄羽肉鸡中的耐受性评价

本试验通过研究饲粮添加不同水平D-泛酸钙对黄羽肉鸡生长性能、血常规指标、血清生化指标、器官指数和组织病理学的影响,以评价肉鸡对D-泛酸钙的耐受性。试验采用单因素完全随机设计,选用640羽健康且体重相近的1日龄黄羽肉公鸡(梅黄1号),随机分为4个组,每组8个重复,每个重复20羽。各组分别在基础饲粮中添加0(对照)、25、125和250 mg/kg的D-泛酸钙(以维生素B5计,本底维生素B5含量:前期8.0 mg/kg,后期6.0 mg/kg)。试验期70 d,分为1~35日龄(前期)和36~70日龄(后期)2个阶段。结果表明:1)1~35日龄,与对照组相比,饲粮添加25 mg/kg D-泛酸钙显著提高肉鸡平均日增重(ADG)(P<0.05),显著降低料重比(F/G)(P<0.05);1~70日龄,与对照组相比,饲粮添加25和125 mg/kg D-泛酸钙显著提高ADG(P<0.05),饲粮添加125 mg/kg D-泛酸钙显著降低F/G(P<0.05)。2)与对照组相比,饲粮添加不同水平D-泛酸钙对肉鸡血常规指标和血清生化指标均无显著影响(P>0.05);饲粮添加25~250 mg/kg D-泛酸钙显著提高肉鸡70日龄血清维生素B5含量(P<0.05),而对35日龄血清维生素B5含量无显著影响(P>0.05)。3)与对照组相比,饲粮添加不同水平D-泛酸钙对肉鸡各器官指数均无显著影响(P>0.05),肉鸡主要器官也均未观测到组织病理学变化。综上可知,黄羽肉鸡对D-泛酸钙的耐受剂量可达250 mg/kg,是有效剂量(25 mg/kg)的10倍。

地衣芽孢杆菌对肉鸡生长性能、抗氧化指标和血液生化指标的影响

本试验旨在探讨地衣芽孢杆菌对肉鸡生长性能、抗氧化指标和血液生化指标的影响。将240只1日龄健康肉鸡随机分为4组,每组4个重复,每个重复15只,Ⅰ组为空白对照组,饲喂基础饲粮;Ⅱ、Ⅲ、Ⅳ组在基础饲粮中添加50、100和200mg/kg地衣芽孢杆菌制剂,试验期为28d,计算肉鸡平均日增重和平均日采食量,并采血分离血清,测定外周血中抗氧化指标和生化指标。结果表明,Ⅱ组平均日增重显著高于Ⅰ组(P<0.05),平均日采食量虽有所升高但差异不显著(P>0.05),料重比显著低于Ⅰ组(P<0.05);Ⅱ组血清中超氧化物歧化酶、谷胱甘肽过氧化物酶活性均显著高于Ⅰ组(P<0.05),丙二醛含量Ⅱ组显著低于Ⅰ组(P<0.05);血清中尿酸、尿素氮含量Ⅱ组显著低于Ⅰ组(P<0.05),白蛋白和总蛋白的含量显著高于Ⅰ组(P<0.05),胆固醇含量和碱性磷酸酶活性各组间均差异不显著(P>0.05)。因此,饲粮中添加地衣芽孢杆菌50mg/kg能提高28d肉鸡的生长性能和抗氧化机能,降低血液中尿酸和尿素氮含量,提高血清总蛋白、白蛋白含量。

CO_2浓度对肉鸡生产性能、体液免疫及血液指标的影响

320只21日龄艾维因肉鸡随机分为5个CO2浓度组(3μg/L、5μg/L、8μg/L、12μg/L、15μg/L),研究鸡舍内不同CO2浓度对肉鸡生产性能、体液免疫及血液指标的影响.结果表明:在舍内CO2浓度12μg/L以下时,试验鸡的生产性能差异不显著,而舍内CO2浓度超过12μg/L时,试验鸡日增质量、饲料利用效率都不同程度地降低(p<0.01,p<0.05);舍内CO2浓度超过8μg/L时试鸡死亡率随CO2浓度升高而升高;各组间试验鸡的IgA、IgG、IgM量差异不显著(p>0.05),但CO2浓度超过12μg/L时,IgA、IgG、IgM呈下降趋势;血常规指标以及血气分析表明CO2浓度超过12μg/L时鸡只呈典型的慢性呼吸性酸中毒;组织切片显示为CO2浓度超过12μg/L时鸡肺泡管扩大,肺泡内充满大量蛋白浆液,有炎性细胞和脱落的上皮细胞,静脉血管严重瘀血.结论:鸡舍内CO2浓度12μg/L以下时,对鸡健康无明显影响,但高于12μg/L以上时,显著影响鸡各项健康指标,不利于鸡健康养殖.

日粮铜和维生素A及其互作效应对肉仔鸡生长性能和血液生理指标的影响

本试验选用1日龄艾维茵肉仔鸡448只,随机分为8组,每组4个重复,每个重复14只鸡,采用4×2(Cu×VA)完全随机设计,研究了日粮添加不同水平的铜(0、8、150、225 mg/kg)和维生素A(1 500、5 000 IU/kg)对肉仔鸡不同生长阶段(前期0-4周龄和后期5-7周龄)的生长性能及血液生理指标的影响。结果表明:高铜(150、225 mg/kg)显著降低前期体增重和采食量、血红蛋白生成和血沉(P<0.05);高铜有利于白细胞生成(P<0.05);0 mg/kg铜组显著提高血红蛋白含量、后期红细胞压积和前期血沉(P<0.05);铜的不同添加水平对全期红细胞数目影响不显著(P>0.05)。5 000 IU/kg维生素A组获得较好的生长性能、血红蛋白含量、红细胞数目,并显著提高前期红细胞压积和白细胞数目,但显著降低后期红细胞压积(P<0.05)。铜和维生素A互作效应对前期体增重及全期料重比影响均显著(P<0.05),对前后期血红蛋白含量、血沉、白细胞计数及后期红细胞压积影响均极显著(P<0.01),且二者间存在互补作用,Cu(8 mg/kg)×VA(5 000 IU/kg)组与Cu(0 mg/kg)×VA(5 000 IU/kg)组对前期肉仔鸡生长性能、红细胞计数、血红蛋白含量、红细胞压积、血沉均较好。铜和维生素A互作效应对全期红细胞数目影响不显著(P>0.05)。结果提示,在基础日粮铜水平为16-23 mg/kg时,铜的适宜添加量前期为8 mg/kg,后期为0-8 mg/kg;全期维生素A的添加量为5 000 IU/kg。

慢性湿度应激对肉仔鸡生产性能及血液生理生化指标的影响

为研究慢性湿度应激对肉仔鸡生产性能和血液生理生化指标的影响,选择生长均匀的21日龄健康AA雄性肉仔鸡144只,随机分成3个处理,即对照(相对湿度60%)、处理1(相对湿度35%)、处理2(相对湿度85%)。试验在智能人工气候舱内进行,试验期为3周。42日龄时,测定肉仔鸡生产性能及血液生化指标。试验结果显示:与对照组相比,高湿度(85%)条件下,试验末鸡体质量、日采食量和日增体质量显著降低,料重比降低,肉仔鸡血清乳酸脱氢酶活性和谷草转氨酶活性显著升高;低湿度(35%)下,肉仔鸡生产性能降低,肉仔鸡血清谷草转氨酶活性显著升高;处理1和处理2中,肉仔鸡血清钾离子含量降低,磷、氯离子含量升高。

日粮中添加木聚糖酶对肉鸡生产性能、养分利用率及血液生化指标的影响

将448只1日龄科宝肉鸡随机分为4个处理,每处理7个重复,每重复16只。分别添加4个水平的木聚糖酶(0、5001、0001、500 U/kg),研究其对肉鸡生产性能、养分利用率及血液生化指标的影响。结果表明,与对照组相比,添加500和1 000 U/kg木聚糖酶可显著提高日增量、蛋白质利用率、能量利用率,并显著降低平均日采食量和料肉比(P<0.05)。添加1 000 U/kg木聚糖酶可显著提高血液中T3、T4、胰岛素和葡萄糖含量(P<0.05)。添加1 500 U/kg木聚糖酶未能显著提高日增量、蛋白质利用率、能量利用率、T3含量和血糖含量。建议在肉鸡玉米-豆粕型日粮中木聚糖酶的添加量为1 000 U/kg,过量添加则对肉鸡生产性能及相关血液指标无明显改善。

饲粮中添加包被蛋氨酸对肉鸡生长性能、血液生化指标和养分表观回肠消化率的影响

本试验旨在研究饲粮中添加不同水平包被蛋氨酸对肉鸡生长性能、血液生化指标和氨基酸表观回肠消化率的影响。选用18日龄科宝500肉鸡3 780只,按试验要求随机分为7组,每组设3个重复,每个重复180只鸡。对照组(A组)饲粮添加0.16%的消旋蛋氨酸(DL-Met),试验组饲粮添加含量为50%的包被蛋氨酸,添加量分别为饲粮的0.32%(B组)、0.29%(C组)、0.26%(D组)、0.22%(E组)、0.19%(F组)、0.16%(G组)。饲喂至42日龄结束。结果表明:B组和C组末重、平均日增重和平均日采食量均显著高于对照组(P<0.05),B组死亡率显著低于对照组(P<0.05),其他组与对照组均差异不显著(P>0.05);各试验组(除G组外)血浆谷胱甘肽过氧化物酶活性均显著高于对照组(P<0.05),B组和C组血浆总超氧化物歧化酶活性均显著高于G组(P<0.05),其他生化指标各组间均差异不显著(P>0.05);各试验组干物质和粗蛋白质表观回肠消化率均与对照组差异不显著(P>0.05),除G组多种氨基酸表观回肠消化率显著低于对照组(P<0.05)外,其他试验组的各种氨基酸表观回肠消化率均与对照组差异不显著(P>0.05)或显著高于对照组(P<0.05)。结果提示,随着包被蛋氨酸添加量的增加,肉鸡生长性能逐渐改善,氨基酸回肠消化率逐渐提高。饲粮添加0.19%包被蛋氨酸(替代对照组60%的蛋氨酸)即可满足肉鸡需要,即采用包被方式后,蛋氨酸最多可节约40%。

不同铬源对肉鸡生长、脏器指数及血液生化指标的影响

研究在肉鸡饲粮中添加不同铬源对肉鸡生长、脏器指数及血清生化指标的影响。结果表明:(1)酵母铬组料重比最低,较对照组和吡啶甲酸铬组差异显著(P<0.05),与蛋氨酸铬组差异不显著(P>0.05);不同铬源对肉仔鸡成活率影响差异不明显(P>0.05)。(2)酵母铬源能显著提高肉仔鸡腹脂率(P<0.05)。酵母铬组较吡啶甲酸铬组能显著提高脾脏指数(P<0.05);酵母铬组、蛋氨酸铬组较对照组和吡啶甲酸铬组能显著降低心脏相对重(P<0.05)。(3)对肉鸡血清生化指标影响都有提高趋势,除对甘油三酯影响差异不显著外(P>0.05),其中吡啶甲酸铬和蛋氨酸铬能显著提高血清中白蛋白、总胆固醇、总蛋白和血糖水平,并且蛋氨酸铬还能显著提高血清中高密度脂蛋白胆固醇和低密度脂蛋白胆固醇水平。

桑饲料对肉鸡生长性能及其血浆尿素氮含量的影响

本试验旨在探讨桑饲料对肉鸡生长性能及血浆尿素氮含量的影响。试验选用1日龄艾维茵肉仔鸡588只,随机分为7个处理,每个处理6个重复,每个重复14只鸡。7个试验处理分别为:对照组(不添加桑叶粉);0%+3%组(4～6周龄添加3%桑叶粉);0%+5%组(4～6周龄添加5%桑叶粉);0%+10%组(4～6周龄添加10%桑叶粉);3%+3%组(0～6周龄添加3%桑叶粉);3%+5%组(0～3周龄添加3%桑叶粉,4～6周龄添加5%桑叶粉);3%+10%组(0～3周龄添加3%桑叶粉,4～6周龄添加10%桑叶粉)。试验结果表明,在0～6周龄,0%+10%组和3%+10%组肉鸡的平均日增重显著低于对照组(P<0.05),其他各组差异不显著(P>0.05)。0%+10%组肉鸡日采食量显著低于3%+3%组(P<0.05),其他各组差异不显著(P>0.05)。添加桑饲料的各组肉鸡饲料转化率均显著低于对照组(P<0.05),0%+5%组除外。桑饲料的添加对肉鸡血浆尿素氮含量的影响不显著(P>0.05),但随着桑饲料添加比例的增加,血浆中尿素氮含量有逐渐降低的趋势。可见,就0～6周龄肉仔鸡生长速度而言,不论0～3周龄添加桑饲料与否,4～6周龄的添加量都可以达到5%,但不应超过10%。

酵母培养物对断奶仔猪生长性能、粪便菌群和血液指标的影响

本试验旨在研究日粮中添加酵母培养物对断奶仔猪生长性能、腹泻率、粪便微生物菌群数量和血液指标的影响。选取144头体重为(7.46±0.52)kg、健康的杜×长×大三元杂交断奶仔猪,随机分配到对照组(饲喂基础日粮)和3个不同添加水平的酵母培养物组(添加量分别为0.25%、0.50%和0.75%),每个处理6个重复(圈),每个重复6头仔猪。试验期为28 d。结果表明:随着日粮中酵母培养物添加量的增加,显著改善了试验结束时仔猪的末重(线性,P<0.05),提高了在试验15~28 d仔猪的平均日增重和采食量(线性,P<0.05)以及在试验全期的日增重和采食量(线性和二次,P<0.05);不同添加水平的酵母培养物组均有效改善了仔猪不同阶段的腹泻发生率,增加了粪便中乳酸杆菌的数量(线性和二次,P<0.05),减少大肠杆菌数(线性,P<0.05);同时,降低了血液中尿素氮的水平(线性,P<0.05)。综上所述,日粮中添加酵母培养物能够显著提高断奶仔猪的生长性能,降低腹泻发生率,并改善肠道微生态区系和血液生化指标,其中0.50%的添加效果最好。

膨化菜籽对肉鸡生产性能及部分血液生化指标的影响

试验选用160只21日龄的艾维茵肉鸡,随机分为5组,每组4个重复(栏),每栏8只鸡,在玉米-豆粕型日粮中添加不同水平膨化菜籽(2.0%、6.0%、10%和14%)。试验结果表明:(1)整个生长期膨化菜籽组与对照组相比,平均日增重、日采食量均有显著提高(P<0.05),料重比显著降低(P<0.05),添加6.0%膨化菜籽组对肉鸡促生长效果最好;(2)膨化菜籽组与对照组相比,对肉鸡血清中白蛋白、尿素氮、碱性磷酸酶、总胆固醇和甘油三酯等生化指标没有显著性影响(P>0.05)。

青蒿及复合中草药添加剂对散养肉鸡生长性能及血液生化指标的影响

为研究青蒿及复合中草药添加剂对散养肉鸡生长性能及血液生化指标的影响,试验选用健康、体重基本一致的30日龄良凤花公鸡360只,采用多因素单水平的试验设计,随机分为4组,每组3个重复,每个重复30只鸡,对照组饲喂基础日粮,三个试验组分别在基础日粮上添加1%的青蒿、1%的青蒿复合添加剂Ⅰ及1%的青蒿复合添加剂Ⅱ,进行为期60 d的饲养试验。饲养试验结束后每个重复选取3只鸡采血和屠宰并测定相关指标。结果表明:与对照组相比,试验3组和试验2组能显著提高肉鸡的平均日增重(P<0.05);试验2组能显著提高肉鸡的全净膛率和腿肌率(P<0.05);试验2组能显著提高肉鸡血清总蛋白(P<0.05),试验3组能显著降低甘油三酯含量(P<0.05)。根据以上结果综合分析,在日粮中添加青蒿复合添加剂Ⅰ(试验2组)对提高散养肉鸡的效果最好。

红景天药渣对肉鸡生长性能、营养物质代谢和血液指标的影响

选用120只肉鸡,分为4组,用0、3%、6%、9%红景天药渣分别添加到CK、T1、T2、T3组的日粮中,研究红景天药渣对肉鸡生长、营养物质代谢和血液指标的影响。结果表明,在日粮中添加9%红景天药渣能显著提高血液红细胞数、血红蛋白含量(P<0.05),有利于氧的运输,提高抗缺氧能力,但日增重、粗蛋白质的表观代谢率、粗脂肪的表观代谢率等指标明显降低(P<0.05);而日粮中添加6%红景天药渣对日增重、粗蛋白质的表观代谢率、粗脂肪的表观代谢率等指标没有明显影响(P>0.05),同时又能提高血液红细胞数、血红蛋白含量,改善血液理化参数,增强肉鸡的抗病能力,提高肉鸡存活率。

饲粮中色氨酸对0～3周龄肉仔鸡生长性能及血液生化指标的影响

试验旨在研究探讨在玉米-豆粕型饲粮中添加不同水平色氨酸对0～3周龄AA肉仔鸡生长性能和血液生化指标的影响。试验采用单因素完全随机分组设计,选择1日龄AA肉仔鸡180只,随机分为5个处理组,每个处理6个重复。试验期间各组饲粮中色氨酸添加水平分别为0、0.03%、0.06%、0.09%、0.12%。试验结果表明:①色氨酸添加水平为0.06%时,可显著增加仔鸡平均日采食量和平均日增重(P<0.05),但料重比变化不显著(P>0.05);②肉仔鸡的血液生化指标,各试验组大部分数据和对照组比较差异显著(P<0.05),其中III组的总蛋白含量最高,总胆固醇、尿素氮、葡萄糖的含量最低;IV组的甘油三酯含量最低。综合分析,在0～3周龄肉仔鸡玉米-豆粕型日粮中添加0.06%水平的色氨酸为宜。

复方中草药对高温下肉鸡生长与血液生化指标的影响

为研究复方中草药对高温下肉鸡生长性能和血液生化指标的影响,选取14周龄母鸡270只,称重后随机分为3组,组Ⅰ为中草药组,温度(35±1)℃;组Ⅱ为高温对照组,温度(35±1)℃;组Ⅲ为常温对照组,温度(20±1)℃,进行对比饲养试验。结果表明:组Ⅰ与组Ⅱ、组Ⅲ体重差异不显著,组Ⅲ体重显著高于组Ⅱ。组Ⅰ葡萄糖(GLU)、总蛋白(TP)、高密度脂蛋白胆固醇(HDL-C)与组Ⅲ差异均不显著;与组Ⅱ相比,GLU、HDL-C略有下降,TP有所上升。组Ⅰ甘油三酯(TG)、低密度脂蛋白胆固醇(LDL-C)显著高于组Ⅲ(P<0.05),与组Ⅱ差异均不显著,但有所下降。组Ⅰ总胆固醇(TC)与组Ⅲ差异不显著,但显著低于组Ⅱ。复方中草药对高温条件下肉鸡受热影响具有一定的缓解作用。

蛋氨酸铜对肉鸡生长性能及某些生理生化指标的影响

选择1日龄健康AA肉仔鸡120只，随机分成4组，使用蛋氨酸铜作为铜源，对照组基础日粮铜含量为11mg／kg，3个试验组日粮中铜含量分别为110mg／kg、220mg／kg和330mg／kg，各试验组肉仔鸡均饲喂添加蛋氨酸铜的玉米-豆饼型日粮至60日龄结束试验。在12，24，36，48，60日龄称量各组鸡体重并计算出36，60日龄时的料肉比；在12，36，60日龄采血，进行红细胞数、血红蛋白含量及血清GH、T3、T4水平的测定。结果表明：与对照组相比，日粮中含铜110mg／kg、220mg／kg和330mg／kg对雏鸡生长有明显的促进作用（P〈0．05），料肉比稍有提高，但与对照组差异不显著（P〉0．05）；血液红细胞数和血红蛋白含量都在正常范围内，没有出现异常减少；高铜（110mg／kg、220mg／kg和330mg／kg）组鸡血清GH水平均低于对照组，而T3、T4浓度均显著高于对照组（P〈0．05）。结果说明高铜可促进肉鸡生长，影响血清中与生长有关的激素水平。