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1.
This study was performed to investigate the influence of dietary boron (B) supplementation on egg production, interior and exterior egg quality and serum parameters related to egg formation in laying hens. Two hundred and twenty four, 18 week old, Hyline Brown 98 strain hens were assigned to 7 groups with 4 replicates. After 10 days of adaptation the hens were fed for 8 weeks on diets supplemented with 0, 5, 10, 50, 100, 200 and 400 mg/kg (diet) B (H3BO3). Live weight, feed consumption and egg production were reduced in the 400 mg/kg B supplemented group. Increases were determined in serum Ca, inorganic P and Mg levels and serum ALP activity was not influenced by supplemental B. Boron changed the interior and exterior quality of eggs. In particular, high level of B supplementation reduced live weight, feed consumption and egg production and changed some blood metabolites. 相似文献
2.
《The Journal of Applied Poultry Research》2008,17(2):229-236
This study was designed to investigate the effects of yeast culture supplementation to laying hen diets containing 2 oilseed meals on performance, egg traits, and some blood parameters. A total of 180 Lohmann Brown laying hens 21 wk of age were allocated to 4 dietary treatments and fed for 16 wk. Two different basal diets were prepared; one contained soybean meal and the other contained sunflower seed meal. Both of the basal diets were supplemented with 0 and 2 g/kg commercial yeast culture product (Saccharomyces cerevisiae). Yeast culture supplementation to diets containing either oilseed meal did not significantly affect feed intake, hen-day egg production, feed efficiency, interior and exterior egg quality characteristics, serum levels of total protein, triglyceride, cholesterol, alanine amino transferase, aspartate amino transferase, and alkaline phosphatase. Body weight gain (P < 0.05), egg weight (P < 0.001), and serum uric acid (P < 0.05) were increased with yeast culture supplementation. The reduction in egg yolk cholesterol was significant (P < 0.001) in the groups fed yeast-supplemented diets. The results in this study demonstrated that yeast culture supplementation to the diets containing soybean meal or sunflower seed meal increased egg weight and decreased egg yolk cholesterol without affecting performance and egg traits, but serum uric acid concentration was increased. 相似文献
3.
This experiment was conducted to evaluate the effects of chromium (chromium picolinate, Cr Pic) and vitamin C (L-ascorbic acid) supplementation on egg production and egg quality in laying hens (Hy-Line) kept at 18 degrees C (at thermo-neutral zone) or 6 degrees C (cold stress) in temperature-controlled rooms. One hundred and fifty laying hens (32 week-old) were divided into 5 groups, 30 hens per group. The laying hens kept at 6 degrees C temperature were fed either a basal diet (low temperature-basal diet, LTB group) or the basal diet supplemented with either 400 micrograms of Cr per kg diet (Cr group), 250 mg of L-ascorbic acid per kg diet (Vit C group) or 400 micrograms of Cr plus 250 mg of L-ascorbic acid per kg diet (Vit C + Cr group) while hens kept at 18 degrees C fed a basal diet (thermo-neutral-basal diet, TNB group). Performance and egg quality were significantly reduced in LTB group compared with TNB group. Supplemental chromium and vitamin C significantly increased live weight change, egg production, and improved feed efficiency in cold-stressed hens compared with group fed the basal diet at 6 degrees C brought up to the values of the group reared under thermoneutral conditions (18 degrees C). Egg production and egg weight were also greater in each supplemental group compared with the LTB group. Separately or as a combination, supplemental chromium and vitamin C increased serum insulin but decreased corticosterone, glucose and cholesterol concentrations. Results of the present study show that supplementing vitamin C and chromium, particularly as a combination, improved the performance of cold-stressed hens. Such a combination of supplement can offer a potential protective management practice in preventing cold stress-related losses in performance of laying hens. 相似文献
4.
Effect of dietary supplementation of organic zinc on laying performance,egg quality and some biochemical parameters of laying hens 
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下载免费PDF全文 M. E. Abd El‐Hack M. Alagawany S. A. Amer M. Arif K. M. M. Wahdan M. S. El‐Kholy 《Journal of animal physiology and animal nutrition》2018,102(2):e542-e549
This study was conducted to evaluate the effects of zinc methionine (Zn‐Met) supplementation on the performance, egg quality, antioxidant status and some biochemical parameters of blood serum in laying hens from 22 to 34 weeks of age. A total of 120 Hisex Brown laying hens of 22‐week‐old were randomly allocated into five treatments with six cage replicates for each (four hens/replicate). Dietary treatments consisted of the basal diet with no Zn‐Met supplementation (control group) and basal diet supplemented with 25, 50, 75 or 100 mg Zn‐Met/kg diet. No significant differences were observed on body weight, body weight gain or feed conversion ratio due to dietary Zn‐Met supplementation. However, highly significant impact was observed on daily feed intake. Egg number, egg weight and egg mass were increased in the group fed diet supplemented with the highest level of Zn‐Met (100 mg/kg of diet) as compared to other groups. All egg quality traits were statistically (p > .05 or .01) affected as a response to dietary Zn‐Met supplementation except egg shape index, shell percentage and yolk index. In comparison with the control group, dietary supplementation of 25, 50, 75 or 100 mg Zn‐Met/kg decreased serum triglyceride and LDL‐cholesterol levels. Serum cholesterol level was increased with all dietary levels of Zn‐Met in comparison with the control group. Dietary Zn‐Met supplementation increased the serum content of zinc, where the highest values were recorded with 50 and 100 mg Zn‐Met/kg diet. Dietary Zn‐Met levels did not affect the antioxidant indices in blood serum except for the activity of copper–zinc superoxide dismutase (Cu‐Zn‐SOD). The activity of Cu‐Zn‐SOD was increased with Zn‐Met supplementations with no differences among supplemental zinc levels. It is concluded that dietary Zn‐Met supplementation reduced serum triglyceride, LDL‐cholesterol and increased Zn status and resulted in promoting antioxidant ability of laying hens, and the addition of 100 mg Zn‐Met/kg to layer diet was appropriate for improving the above parameters in addition to egg production indices and Haugh unit score. 相似文献
5.
Effects of cerium oxide supplementation to laying hen diets on performance,egg quality,some antioxidant enzymes in serum and lipid oxidation in egg yolk 下载免费PDF全文
下载免费PDF全文 S. C. Bölükbaşı A. A. Al‐sagan H. Ürüşan M. K. Erhan O. Durmuş N. Kurt 《Journal of animal physiology and animal nutrition》2016,100(4):686-693
This study was conducted to determine the effects of dietary cerium oxide levels (0, 100, 200, 300 or 400 mg/kg) on the laying performance, egg quality, some blood serum parameters and egg lipid peroxidation of laying hen. In total, one hundred and twenty 22‐week‐old brown Lohman LSL laying hens were randomly assigned to five groups equally (n = 24). Each treatment was replicated six times. Dietary supplementation of cerium oxide had no significant effect on feed intake and egg weight. The addition of cerium oxide to the laying hens' feed improved feed conversion ratio and increased (p < 0.05) egg production. Quality criteria of egg for except shell breaking strength were not affected by supplementing cerium oxide. In particular, supplementation of 200 and 300 mg/kg cerium oxide to the laying hens feed led to a significant (p < 0. 01) increase in egg shell breaking strength. Calcium and phosphorus concentration of serum increased significantly (p < 0.05) with supplementation of 100 mg/kg cerium oxide to laying hen diets. It was also observed that serum superoxide dismutase (SOD) activity and malondialdehyde (MDA) concentration decreased significantly with supplementation of cerium oxide in diets. Inclusion of cerium oxide resulted in a significant reduction in thiobarbituric acid reactive substance (TBARS) values in egg yolk in this study. It can be concluded that the addition of cerium oxide had positive effects on egg production, feed conversion ratio and egg shelf life. Based on the results of this study, it could be advised to supplement laying hens feed with cerium oxide as feed additives. 相似文献
6.
《中国畜牧杂志》2020,(1)
试验旨在探究天然腐植酸和合成腐植酸对蛋鸡产蛋后期生产性能、蛋品质、血清生化指标、抗氧化指标和激素水平的影响。选取52周龄体重、产蛋率相近的海兰白蛋鸡405羽,随机分成3个组,每组9个重复,每个重复15羽。对照组饲喂基础饲粮(CON组),试验组在基础饲粮中分别添加1 000 mg/kg的天然腐植酸A(HAA组)和合成腐植酸B(HAB组),预试期2周,正试期8周。结果表明:与CON组相比,添加腐植酸均可提高平均蛋重(P<0.05),降低不合格蛋率(P<0.05)和料蛋比(P<0.01),其中HAA组产蛋率极显著提高,HAA组的料蛋比低于HAB组(P<0.01);饲粮添加腐植酸对蛋品质无显著影响;与CON组相比,HAA组血清中白蛋白含量降低(P<0.05),HAB组乳酸脱氢酶活性提高(P<0.05),HAA组与HAB组血清中甘油三酯含量均降低(P<0.01);相比于CON组,添加HAB可提高谷胱甘肽过氧化物酶活性(P<0.05);与CON组相比,饲粮中添加腐植酸提高了血清中促黄体素水平(P<0.01),对促卵泡素水平有升高趋势(P=0.060),且HAA组中促卵泡素水平高于HAB组(P<0.01)。结果提示,腐植酸可促进机体促性腺激素分泌,改善机体抗氧化水平,显著提高产蛋后期蛋鸡的生产性能,且天然提取的腐植酸作用效果更佳。 相似文献
7.
1. The objective of the study was to investigate the effect of dietary karaya saponin on cholesterol deposition in laying hens. 2. A total of 40 Boris Brown hens were randomly assigned at 20 weeks of age to 4 treatment groups and fed on diets supplemented with 0 (control), 25, 50 or 75 mg/kg karaya saponin for an 8-week experimental period. 3. After 8 weeks of dietary supplementation, karaya-saponin-treated groups had significantly lower serum cholesterol (23·0%) and triglycerides but increased high density lipoproteins cholesterol concentration than controls, irrespective of karaya saponin content in the diet. Egg yolk cholesterol and triglycerides were also significantly reduced by dietary karaya saponin. Hepatic cholesterol and triglycerides were significantly reduced by karaya saponin but bile acids concentration in the faeces and liver were significantly increased by karaya saponin. The concentrations of oleic, linoleic and linolenic acids in the yolk were greater in hens receiving karaya saponin than in controls. Karaya saponin significantly increased egg production, feed efficiency and yolk colour compared with controls. Karaya saponin tended to increase egg weight, feed consumption, Haugh units, albumen weight and yolk index. 4. In conclusion, karaya saponin is a potential agent for reducing yolk cholesterol concentration together with an overall increase of production performance and improvement in egg quality. 相似文献
8.
茶多酚对蛋鸡生产性能、蛋品质和抗氧化能力的影响 总被引：2，自引：0，他引：2
本试验旨在研究茶多酚(TP)对蛋鸡生产性能、蛋品质和抗氧化能力的影响。试验选用450只24周龄的健康海兰灰产蛋鸡,分为5个组,每组6个重复,每个重复15只鸡。对照组饲喂基础饲粮,试验组分别在基础饲粮中添加40、80、200和400 mg/kg TP。试验期63 d,其中预试期7 d、正试期56 d。结果表明,与对照组相比:1)400 mg/kg TP显著降低了试验期前4周的平均蛋重(P0.05);200 mg/kg TP显著改善试验期后4周的料蛋比(P0.05);TP未显著影响产蛋率和平均日采食量(P0.05)。2)饲粮中添加TP未显著影响蛋形指数、蛋壳强度、蛋壳厚度、蛋白高度、哈夫单位和蛋黄颜色(P0.05)。3)TP显著提高了血浆总超氧化物歧化酶(T-SOD)和谷胱甘肽过氧化物酶(GPx)活性(P0.05);显著提高试验期第8周时血浆总抗氧化能力(T-AOC)(P0.05)。4)TP显著提高了肝脏和蛋黄T-AOC和T-SOD活性(P0.05);显著降低肝脏和蛋黄中丙二醛(MDA)含量(P0.05)。由此可见,饲粮中添加TP未显著影响蛋鸡蛋品质;400 mg/kg TP降低了平均蛋重,200 mg/kg TP改善了料蛋比,两者均提高了蛋鸡的抗氧化能力,其中以200 mg/kg组效果最佳。 相似文献
9.
本试验旨在研究饲粮中添加高剂量蛋氨酸锌对蛋鸡生产性能、血液学指标和组织病理学的影响,以确定蛋鸡对饲用蛋氨酸锌的耐受剂量。试验采用单因子完全随机设计,选择健康且体重和产蛋率相近的20周龄海兰白蛋鸡540只,随机分成6个组,每个组6个重复,每个重复15只鸡。各组分别饲喂蛋氨酸锌添加水平为0(对照)、70(有效剂量)、140(2倍有效剂量)、350(5倍有效剂量)、700(10倍有效剂量)和1 400 mg/kg(20倍有效剂量)的试验饲粮。试验为期8周。结果显示:1)与对照组相比,70 mg/kg组、140 mg/kg组日产蛋重和产蛋率显著提高(P0.05),料蛋比显著降低(P0.05);350 mg/kg组、700 mg/kg组上述指标与对照组差异不显著(P0.05);与0~700 mg/kg组相比,1 400 mg/kg组日产蛋重和产蛋率极显著降低(P0.01),料蛋比极显著提高(P0.01)。2)饲粮中添加蛋氨酸锌对蛋鸡血液常规指标无显著影响(P0.05)。3)与对照组相比,饲粮中添加70~700 mg/kg蛋氨酸锌对蛋鸡血清生化指标无显著影响(P0.05),但添加1 400 mg/kg蛋氨酸锌极显著提高了血清葡萄糖、尿酸、肌酐、总胆红素含量以及谷草转氨酶、碱性磷酸酶活性(P0.01)。4)添加20倍推荐有效剂量(1 400 mg/kg)的蛋氨酸锌会引起主要器官组织的损伤和病变。结果提示,蛋鸡饲粮中蛋氨酸锌的耐受剂量为700mg/kg。 相似文献
10.
A 24-week performance trial was conducted to evaluate the efficacy of an experimental phytase on performance, egg quality, tibia ash content and phosphorus excretion in laying hens fed on either a maize- or a barley-based diet. At the end of the trial, an ileal absorption assay was conducted in order to determine the influence of phytase supplementation on the apparent absorption of calcium and total phosphorus (P). Each experimental diet was formulated either as a positive control containing 3.2 g/kg non-phytate phosphorus (NPP), with the addition of dicalcium phosphate (DCP), or as a low P one, without DCP addition. Both low P diets (containing 1.3 or 1.1 g/kg NPP) were supplemented with microbial phytase at 0, 150, 300 and 450 U/kg. The birds were housed in cages, allocating two hens per cage as the experimental unit. Each of 10 dietary treatments was assigned to 16 replicates. Low dietary NPP (below 1.3 g/kg) was not able to support optimum performance of hens during the laying cycle (from 22 to 46 weeks of age), either in maize or barley diets. Rate of lay, daily egg mass output, feed consumption, tibia ash percentage and weight gain were reduced in hens fed low NPP diets. The adverse effects of a low P diet were more severe in hens on a maize diet than in those on a barley diet. Low dietary NPP reduced egg production, weight gain, feed consumption and tibia ash content and microbial phytase supplementation improved these parameters. Hens given low NPP diets supplemented with phytase performed as well as the hens on positive control diets containing 3.2 g/kg of NPP. A 49% reduction of excreta P content was achieved by feeding hens on low NPP diets supplemented with phytase, without compromising performance. Phytase addition to low NPP diets increased total phosphorus absorption at the ileal level, from 0.25 to 0.51 in the maize diet and from 0.34 to 0.58 in the barley diet. Phosphorus absorption increased linearly with increasing levels of dietary phytase. Mean phosphorus absorption was higher in barley diets than in maize diets (0.49 vs 0.39). 相似文献
11.
本研究旨在探讨茶多酚和酵母硒及其互作对绿壳蛋鸡生产性能、蛋品质及蛋黄中胆固醇和硒含量的影响。试验选用810只44周龄健康绿壳蛋鸡,随机分成9个组,每组5个重复,每个重复18只鸡。采用2因素3水平试验设计,在基础饲粮中分别添加不同剂量的茶多酚和酵母硒构成试验饲粮,茶多酚设0、200、400 mg/kg 3个添加水平,酵母硒(按硒计)设0、0.25、0.50 mg/kg 3个添加水平。预试期7 d,正试期28 d。结果表明:1)饲粮中添加茶多酚和酵母硒均有提高平均蛋重的趋势(P>0.05),添加200、400 mg/kg茶多酚能显著提高产蛋率且显著降低料蛋比(P<0.05);2)饲粮中添加茶多酚和酵母硒对蛋黄指数、蛋黄色泽和哈氏单位均有提高的趋势(P>0.05),添加0.50 mg/kg酵母硒能显著提高蛋形指数(P<0.05),同时使蛋壳厚度显著下降(P<0.05),添加200、400 mg/kg茶多酚能显著减缓鸡蛋在贮藏过程中哈氏单位的下降(P<0.01);3)饲粮中添加200、400 mg/kg茶多酚均能显著降低蛋黄胆固醇含量(P<0.01),添加0.25、0.50 mg/kg酵母硒均能显著提高蛋黄硒含量(P<0.01);4)茶多酚和酵母硒的互作对生产性能、蛋品质及蛋黄中胆固醇和硒含量均无显著影响(P>0.05)。由此可见,在基础饲粮中采用400 mg/kg茶多酚和0.25 mg/kg酵母硒的添加组合对蛋鸡生产性能和蛋品质不会产生拮抗作用,并可有效生产"富硒+低胆固醇"的绿壳鸡蛋。 相似文献
12.
试验探讨维生素E对免疫抑制蛋鸡生产性能和蛋品质的调控效应,选取健康的尼克褐产蛋鸡270只,随机等分为5组,每组3个重复,每重复18只。第Ⅰ组为对照组,第Ⅱ~Ⅴ组为免疫抑制组,对第Ⅱ~Ⅴ组鸡在试验第5、6、7 d进行腿部肌肉注射80 mg/kgBW环磷酰胺(CTX),第Ⅰ组注射等量生理盐水。Ⅰ、Ⅱ组饲喂基础日粮(维生素E含量44.59 mg/kg),Ⅲ、Ⅳ、Ⅴ组在基础日粮中分别添加50、100、200 mg/kg维生素E。结果显示:①免疫抑制产蛋鸡的产蛋率、平均蛋重和平均日采食量显著降低(P<0.05),破蛋率显著升高(P<0.05)。基础日粮中添加50 mg/kg维生素E显著提高免疫抑制产蛋鸡的产蛋率、平均蛋重和平均日采食量(P<0.05),但仍低于对照组Ⅰ(P<0.05);显著降低料蛋比和破蛋率(P<0.05)。②免疫抑制产蛋鸡的蛋壳厚度、蛋壳强度和哈氏单位显著降低(P<0.05),蛋形指数和蛋黄颜色无显著改变(P>0.05);50 mg/kg维生素E添加量显著提高免疫抑制产蛋鸡的蛋壳厚度、蛋壳强度和哈氏单位(P<0.05),与对照组Ⅰ无显著差异(P>0.05)。因此,免疫抑制显著降低产蛋鸡的生产性能和蛋品质;基础日粮中添加维生素E对免疫抑制蛋鸡的生产性能和蛋品质具有明显的调控效应,且以50 mg/kg添加量效果较好。 相似文献
13.
本试验旨在研究饲粮添加不同水平苜蓿粗多糖对蛋鸡生产性能和蛋品质的影响。选取540只27周龄的海兰褐壳蛋鸡,随机分为6组,每组6个重复,每个重复15只鸡。对照组饲喂基础饲粮,试验组分别饲喂在基础饲粮中添加250、500、1 000、2 000和4 000 mg/kg苜蓿粗多糖的试验饲粮。试验期24周。结果表明:与对照组相比,1)试验1~8周,500、2 000和4 000 mg/kg苜蓿粗多糖添加组产蛋率均显著提高(P0.05);试验9~16周、17~24周和1~24周,250、500、1 000和2 000 mg/kg苜蓿粗多糖添加组产蛋率显著提高(P0.05),料蛋比显著降低(P0.05),且在试验17~24周和1~24周,总产蛋重量显著提高(P0.05),而平均蛋重和采食量无显著差异(P0.05);2)250、500和1 000 mg/kg苜蓿粗多糖添加组在试验第6、8、12、16、20和24周蛋壳颜色显著加深(P0.05),且在试验第8、12、16周较4 000 mg/kg苜蓿粗多糖添加组蛋壳颜色亦显著加深(P0.05);3)2 000 mg/kg苜蓿粗多糖添加组在试验第6、20、24周蛋壳强度显著提高(P0.05);4)试验第8、12、16、20和24周,250、500、1 000和2 000mg/kg苜蓿粗多糖添加组蛋壳厚度显著增加(P0.05),且4 000 mg/kg苜蓿粗多糖添加组在试验第8、20、24周蛋壳厚度亦显著增加(P0.05);5)2 000 mg/kg苜蓿粗多糖添加组在试验第10、12和24周蛋白高度和哈夫单位显著提高(P0.05),且2 000 mg/kg苜蓿粗多糖添加组在试验第10和12周蛋白高度和哈夫单位显著高于250、1 000和4 000 mg/kg苜蓿粗多糖添加组(P0.05)。试验表明,产蛋期蛋鸡饲粮中添加适宜水平的苜蓿粗多糖可以显著提高蛋鸡生产性能,改善蛋品质,且推荐适宜添加水平为250 mg/kg。 相似文献
14.
1. This experiment was carried out to determine the effects of dietary iodine supplementation on the performance and egg traits of laying hens. A total of 600 SHSY type brown layers aged 21 weeks of age were chosen at random from a large flock. They were randomly distributed into 30 pens at 20 hens per pen. Each treatment comprised 6 replicates of 20 layers in groups of 5 birds. The diets were supplemented with 0, 3, 6, 12 and 24 mg/kg iodine as calcium iodate. The experimental period lasted 30 weeks. 2. There were no significant differences among the groups in body weight, food consumption, egg production, food consumption per kg eggs, eggshell index, eggshell breaking strength, shell thickness or egg yolk index. 3. Supplementation of the diet with 12 mg/kg iodine increased food consumption per dozen eggs compared to the groups fed on diets supplemented with 0 and 6 mg/kg iodine. 4. Egg weight was less in groups fed on diets supplemented with 12 and 24 mg/kg iodine than in the group receiving no iodine supplementation. 5. Iodine supplementation to provide 12 and 24 mg/kg reduced egg albumen index and egg Haugh units. 6. There were no significant differences among the groups in egg cholesterol and egg yolk cholesterol contents. 7. The iodine concentrations in egg yolk, egg albumen and whole egg increased with increased iodine supplementation. 8. As a result, the 3 and 6 mg/kg iodine supplementation of diet could be used to enrich the eggs with iodine without any adverse effect on performance and egg traits. 相似文献
15.
《The Journal of Applied Poultry Research》2009,18(1):43-53
This study was conducted to evaluate the effect of Rovabio, dietary energy, and protein on performance, egg composition, egg solids, and egg quality of commercial Leghorns in phase 2, second cycle. A 4 × 2 × 2 factorial arrangement of treatments comprising 4 dietary energy levels (2,791, 2,857, 2,923, and 2,989 kcal of ME/kg) and 2 protein levels (15.5 and 16.1%) with and without Rovabio was used. Hy-Line W-36 hens (n = 1,920, 87 wk old) were randomly divided into 16 dietary treatments (8 replicates of 15 hens per treatment). The trial lasted 12 wk. Dietary protein significantly increased feed consumption but decreased yolk color. As dietary energy increased from 2,791 to 2,989 kcal of ME/kg, feed consumption decreased from 98.0 to 94.9 g per hen daily, and yolk color increased from 5.27 to 5.56. There was a significant interaction among dietary protein, energy, and Rovabio on egg production, BW, egg mass, feed conversion, and yolk solids. Egg weight of hens fed the diets supplemented with Rovabio was significantly greater than that of hens fed the diets without Rovabio during wk 3 and 4. However, Rovabio did not significantly influence average egg weight (87 to 98 wk of age). Rovabio supplementation significantly increased BW of hens. These results suggest Rovabio had a small but significant influence on nutrient utilization of commercial Leghorns during phase 2 of the second cycle. 相似文献
16.
An experiment was conducted to determine if vitamin E (alpha-tocopherol-acetate) and chromium (chromium picolinate, Cr Pic) supplementation attenuate the negative effects of cold stress on egg production, egg quality, serum metabolites, and antioxidant status in Japanese quails (Corurnix coturnix japonica). One hundred and fifty laying Japanese quails (50-day-old) were divided into five groups, 30 birds per group. The laying quails kept at 6 degrees C for 12 h/d (08.00 p.m. to 08.00 a.m.) were fed either a basal diet (low temperature-basal diet, CS group) or the basal diet supplemented with either 400 microg of Cr/kg of diet (Cr group), 250 mg of alpha-tocopherol-acetate per kg of diet (Vit. E group) or 400 microg of Cr plus 250 mg of alpha-tocopherol-acetate per kg of diet (Vit. E + Cr group) while quails kept at 18 degrees C were fed a basal diet (thermo-neutral-basal diet, TN group). Performance and egg quality were significantly reduced in CS group compared with TN group. Supplemental chromium and vitamin E significantly increased live weight change, egg production, and improved feed efficiency in cold-stressed laying hens compared with the group fed the basal diet at 6 degrees C. Egg production and egg weight were also greater (P < 0.05) in each supplemental group compared with the CS group. However, a combination of vitamin E and chromium, rather than each separately, provided the greatest performance. Supplemental vitamin E and chromium also increased serum vitamin C and E but, decreased malondialdehyde (MDA) concentrations (P < 0.05); the combination of vitamin E and chromium resulted in the highest levels of serum vitamin C and E within the cold-stressed quails. Results of the present study indicate that combined antioxidant supplements increased performance, egg quality and serum antioxidant levels while lowering MDA in cold-stressed quails. 相似文献
17.
Garaleviciene D Pettersson H Elwinger K 《Journal of animal physiology and animal nutrition》2002,86(11-12):389-398
The effects of trichothecene nivalenol (NIV) on the health and production of laying hens were determined in a feeding study. White Leghorn hens, 55 weeks old, were fed diets containing 0, 1, 3 and 5 mg NIV/kg during 50 days. Feed intake was reduced by NIV, but there were no effects on body weight, egg production and egg quality. Traces of unaltered NIV were found in liver and bile. Alkaline phosphatase in the blood plasma increased in the hens fed 0, 1 and 3 mg NIV/kg diet but decreased in the birds fed 5 mg NIV/kg feed. Total protein and glucose were slightly reduced in hens fed 5 mg NIV/kg diet. Pathological examination revealed that 40-75% of hens fed NIV (3 and 5 mg/kg) supplemented diet showed gizzard lesions, haemorrhages in the duodenum and swollen cloaca and oviducts with immature eggs while certain birds in the 1 mg NIV group showed light and fragile livers. NIV and the metabolite de-epoxy-NIV in faeces were found to constitute up to 10% of ingested NIV. 相似文献
18.
本研究旨在评估夏季高温时日粮添加甜菜碱对蛋鸡生产性能、蛋品质及骨骼和血液理化特性的影响.试验将480只产蛋性能一致的罗曼粉壳蛋鸡随机分为2组,每组240只,每组10个重复(24只/重复).对照组饲喂基础试验日粮,处理组蛋鸡饲喂基础试验日粮+150?mg/kg甜菜碱,试验为期8周.结果:日粮添加150?mg/kg甜菜碱对... 相似文献
19.
The influence of dietary boron (B) supplementation on some serum parameters and egg-yolk cholesterol was studied in laying hens. A total of 224 eighteen-week-old hens of the Hyline Brown 98 strain were assigned to 7 groups with 4 replicates of 8 hens each after 10 days of adaptation, and they were fed commercial diets supplemented with 0, 5, 10, 50, 100, 200 or 400 mg/kg (diet) B (H3BO3) for 8 weeks. Serum gamma-glutamyl transpeptidase (GGT) activity, albumin, glucose, total cholesterol, HDL- and LDL-cholesterol levels were decreased with all B levels. Except in the group receiving 5 mg/kg B supplementation, decreases were found in serum triglycerides in all groups. Serum aspartate aminotransferase (AST) activity was decreased in the groups receiving 100 mg/kg or higher levels of B. All levels of B supplementation increased lactate dehydrogenase (LDH) activity at weeks 21 and 22, while 10 mg/kg or higher levels of B increased serum globulin, urea and egg-yolk cholesterol levels. The results demonstrate that B supplementation at levels exceeding 5 mg/kg affects serum biochemical parameters and increases egg-yolk cholesterol in laying hens. 相似文献
20.
Impact of supplementing diets with propolis on productive performance,egg quality traits and some haematological variables of laying hens 下载免费PDF全文
下载免费PDF全文 A. A. A. Abdel‐Kareem T. M. El‐Sheikh 《Journal of animal physiology and animal nutrition》2017,101(3):441-448
One hundred and twenty eight, 28‐weeks‐old Lohmann LSL hybrid layers were used in this experiment, which lasted 12 weeks to investigate the effect of propolis supplementation on the productive performance, egg quality traits and haematological variables of laying hens. All hens were randomly classified into four equal experimental groups, eight replicates (4 birds/each). Hens in group 1 were fed on a commercial diet and considered as control group, while those in groups 2, 3 and 4 were fed on the same commercial diet and supplemented with 250, 500 and 1000 mg propolis/kg diet. The obtained results revealed that daily feed consumption/hen increased insignificantly with increasing propolis level than that of the control group. Regarding the means of egg mass and egg production rate, it was observed that the laying hens fed diets containing 250 and 1000 mg propolis/kg significantly (p < 0.05) produced more and heaver egg in comparison with control group. External egg quality traits have not affected with increasing the level of propolis, while eggshell weight was significantly (p < 0.05) increased. The internal egg quality traits except albumen and yolk percentages increased significantly (p < 0.05) with increasing propolis level for treated hens as compared to those in the control. Concerning the haematological parameters, the results showed that the levels of total protein and globulin increased significantly with increasing propolis level, while cholesterol and liver enzymes were significantly decreased (p < 0.05). Heterophils count of hens in the treated groups significantly decreased, whereas the lymphocyte count significantly increased, resulting in a decreased H/L ratio than that of the control group. Thus, it could be concluded that the supplementation of 250 mg propolis/kg diet is highly recommended to improving egg production, blood constituent and haematological parameters of the commercial laying hens. 相似文献