The effects of formic acid-treated shrimp meal on laying performance and egg quality in aged laying hens

An experiment was carried out to measure the suitability of using formic acid-treated shrimp meal (TSM) as a protein source for aged laying hens. Shrimp meal (SM), air-dried shrimp waste was treated with 3% formic acid (w/v) at room temperature for 20 min, sun-dried, ground to pass through 1.0 mm mesh screen and then ready to use as the TSM. A total of 56 Single Comb White Leghorn hens, 85 wk of age, were placed in individual cages and assigned randomly into 7 dietary groups of 8 birds each. A control diet, diets containing 5, 10, and 15% SM and diets containing 5, 10, and 15% TSM were prepared. Diets and water were given ad libitum during the 30-d experimental period. Hen-day egg production, egg mass, feed intake, and feed conversion ratio (FCR) were deteriorated with increasing levels of the SM in the diets (P < 0.05). In contrast, these parameters were unchanged with increasing levels of the TSM in diets and compatible with the control group. No significant improvements were observed in exterior or interior egg quality among the dietary groups, except for eggshell weight, strength and yolk color, which were significantly increased in SM and TSM groups when compared to the values in control group (P < 0.05). It is concluded that inclusion of TSM up to 15% in laying hen diets may have beneficial effects on laying performance along with improved eggshell quality and yolk color, and suggested that TSM is a promising combined source of protein and calcium in aged laying hens.     

维生素E对蛋鸡产蛋后期产蛋性能和蛋品质的影响

文章旨在研究日粮中不同梯度维生素E添加水平对蛋鸡产蛋后期产蛋性能和蛋品质的影响.试验选择60周龄罗曼白壳商品蛋鸡300羽,试验随机分为5组,添加水平分别为0(对照组),30、60、120、240 mg/kg,每组6个重复,每个重复10羽鸡,预试期1周,正试期8周.结果表明:与对照组相比,蛋鸡产蛋后期日粮中添加120 m...     

复合微生态制剂对蛋鸡产蛋性能、蛋品质、血清生化指标和肠道形态的影响

试验在基础饲粮中添加由丁酸梭菌和屎肠球菌组成的复合微生态制剂,研究其对产蛋高峰期蛋鸡的产蛋性能、蛋品质、血清生化指标、肠道形态的影响.选取产蛋率和体重接近的40周龄健康的海兰褐蛋鸡400只,随机分成4组,每组5个重复,每个重复20只鸡.对照组蛋鸡饲喂基础饲粮,抗生素组在基础饲粮中添加200 g/t金霉素,试验1组、2组...     

日粮中添加铜对产蛋鸡生产性能及蛋品质的影响

本试验选择五水硫酸铜作为饲料添加的铜源,以产蛋高峰期的海兰褐壳蛋鸡为试验动物,研究日粮中添加60mg/kg的铜对蛋鸡生产性能、蛋品质的影响。试验选取40周龄的海兰褐壳蛋鸡104只,设两个处理,每个处理4个重复,每个重复13只鸡。对照组饲喂基础日粮,试验组饲喂基础日粮 硫酸铜52mg/kg。试验结果表明:1)与对照组相比,试验组能够提高产蛋鸡的各项生产性能,日产蛋重、产蛋率、料蛋比、日采食量均有上升趋势(P>0.05)。2)与对照组相比,试验组的蛋形指数差异不显著(P>0.05),蛋壳厚度变厚(P>0.05),蛋白、蛋黄重以及蛋白蛋黄的比值差异不显著(P>0.05),破软蛋率下降(P>0.05)。     

人参提取物对蛋鸡产蛋性能、蛋品质、血清生化指标及经济效益的影响

文章旨在评估日粮添加不同水平人参提取物对蛋鸡产蛋性能、蛋品质及血清生化指标的影响.试验选择产蛋性能一致的450只海兰褐壳蛋鸡,随机分为3组,每组5个重复,每个重复30只.对照组饲喂基础日粮,处理组分别在基础日粮中添加0.04％和0.08％人参提取物,试验共进行6周.结果:与对照组相比,0.04％和0.08％人参提取物组...     

低豆粕日粮对产蛋鸡生产性能及蛋品质的影响

试验选用1 600只生产性能相同、体况良好的33周龄罗曼蛋种鸡,随机分为4组,在总蛋白质含量相同和满足必需氨基酸需要量的情况下,用价格较低的蛋白饲料取代蛋鸡日粮中豆粕,研究氨基酸平衡的低豆粕日粮对蛋种鸡生产性能和蛋品质的影响。结果表明:氨基酸平衡的低豆粕日粮对蛋鸡产蛋率、种蛋合格率、健雏率、蛋形指数、蛋比重、蛋壳厚度、哈氏单位等指标无显著影响(P>0.05),但当日粮中的豆粕含量降低8～15个百分点时,蛋种鸡的日平均蛋重、日采食量、受精率、孵化率等显著低于正常豆粕日粮(P<0.05),而考虑综合因素日粮中的豆粕含量降低8个百分点的第1组,与正常豆粕日粮相比,差异不显著(P>0.05),而且能降低饲料成本,可以提高蛋鸡养殖效益,具有实际意义。     

两种复合酶对产蛋后期蛋鸡生产性能、蛋品质及血清生化指标的影响

为研究两种复合酶对产蛋后期蛋鸡生长性能、蛋品质及血液生化指标的影响,试验采取单因素试验设计,选用540只60周龄的海兰褐蛋鸡,随机分成3组,每组6个重复,每个重复30只鸡.对照组饲喂基础饲粮,试验组分别在基础日粮中添加两种复合酶,其中复合酶Ⅰ主要由糖化酶和蛋白酶组成,复合酶Ⅱ为复合酶Ⅰ+普鲁兰酶.试验周期为60 d.结...     

酯化牛膝多糖对蛋鸡生产性能和蛋品质的影响

为研究饲料中添加酯化牛膝多糖对蛋鸡生产性能和蛋品质的影响,选取134日龄海兰灰商品代蛋鸡240只,随机分为6组,每组设4个重复,每个重复10只鸡。试验Ⅰ组设为对照组,饲喂基础日粮,试验Ⅱ～Ⅵ组为酯化牛膝多糖处理组,分别在基础日粮中添加50、100、200、300、400 mg/kg的酯化牛膝多糖,研究其对蛋鸡生产性能及蛋品质的影响。结果表明:与对照组相比,50 mg/kg组、100 mg/kg组和200 mg/kg组蛋鸡的产蛋率、蛋重有显著提高(P <0.05),产蛋率151～167日龄分别提高1.51%、 3.25%、1.74%;168～184日龄分别提高4.47%、5.84%、4.47%;100 mg/kg组和200 mg/kg组185～202日龄分别提高2.81%、2.58%,均达到显著水平。185日龄100 mg/kg组以及202日龄100 mg/kg和200 mg/kg组的蛋重分别提高4.29%、5.41%、4.47%,显著高于对照组。50 mg/kg组、100 mg/kg组和200 mg/kg组的料蛋比分别降低2.00%、2.40%、2.40%,差异显著(P <0.05)。100 mg/kg酯化牛膝多糖组哈氏单位显著提高(P <0.05),151、168、185、202日龄分别比对照组提高了7.25%、6.4%、8.14%和10.34%;其对蛋黄相对重、蛋壳厚度、蛋壳强度及蛋壳相对重无显著影响(P> 0.05)。     

茶皂素对蛋鸡生产性能、蛋品质和养分利用率的影响

试验旨在研究饲粮中添加不同水平茶皂素对蛋鸡生产性能、蛋品质和养分利用率的影响.选取600只40周龄健康的海兰褐商品蛋鸡,随机分为4组,每组6个重复,每个重复25只鸡.对照组饲喂基础饲粮,试验组在基础饲粮中分别添加100、200、300 mg/kg的茶皂素.预试期7d,正式试验期56 d.结果表明:与对照组相比,100、...     

Effect of excess dietary threonine on laying performance,egg quality,serum free amino acids,and digestive enzymes activities of laying hens during the postpeak period

A total of 640 layer hens, 56 wk of age, were allocated to 4 dietary treatments groups, each of which included 5 replicates of 32 hens. Graded levels ofl-Thr were added to the basal diet at 0.0 (control), 1.0, 2.0, and 3.0 g/kg; determined Thr values were 5.7, 6.5, 7.4, and 8.7 g/kg of diet, respectively. In the 53-d feeding trial, egg production increased significantly due to dietaryl-Thr supplementation. Hens fed 2.0 g of Thr/kg of diet had significantly higher egg production than the control diet. Supplementing the diet withl-Thr did not affect egg weight or feed intake, but egg mass increased significantly. Also, FCR was improved significantly and the best FCR was exhibited by hens receiving 2.0 g of Thr/kg of diet. Feeding laying hens a diet containing 2.0 g ofl-Thr/kg of diet improved Haugh units linearly; however, egg shell thickness decreased linearly as the level of dietary Thr increased, and the lowest value was observed for hens fed 3.0 g of Thr/kg of diet. Serum free Thr increased linearly as supplemental Thr increased, but serum free Ile, Phe, and Tyr decreased. No differences attributable tol-Thr were found among groups in the activity of digestive enzymes (trypsin and amylase) in the mucosal homogenates of the jejunum. The activity of α-alkaline phosphatase in the jejunum was analyzed as a marker of mucosal enterocyte maturation and no differences due tol-Thr supplementation were noted. In conclusion, feeding laying hens from 56 to 64 wk of agel-Thr up to 2.0 g/kg can improve laying performance and Haugh units.     

Effect of dietary supplementation of organic zinc on laying performance,egg quality and some biochemical parameters of laying hens

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.     

日粮中添加女贞子粉对蛋鸡生产性能和蛋品质的影响

选择150只49周龄、平均体重(1.99±0.17)kg的健康海兰褐蛋鸡,采用单因素完全随机分组试验设计,随机分为对照组(基础日粮)、试验组Ⅰ(基础日粮+0.5%女贞子粉)、试验组Ⅱ(基础日粮+1%女贞子粉)。每组设5个重复,每个重复10只蛋鸡,试验期为8周,研究了女贞子粉对蛋鸡生产性能和蛋品质的影响。结果表明:与对照组相比,试验组Ⅰ、Ⅱ产蛋率分别提高了4.86%和11.75%(P0.05)。试验组Ⅰ蛋黄颜色显著高于对照组9.60%(P0.05)。日粮中添加女贞子粉可以提高蛋鸡产蛋率,改善蛋黄颜色,进而提高蛋鸡的生产性能和蛋品质。     

棕榈粕对粉壳蛋鸡生产性能及蛋品质量的影响

试验选用215日龄罗曼粉蛋鸡540只,研究添加不同水平棕榈粕对产蛋性能和蛋品质量的影响。试验共设3个处理,每个处理5个重复,每个重复36只鸡,随机饲喂添加两个水平棕榈粕（3.75%和5%）的日粮和未添加棕榈粕的商品蛋鸡饲料。试验结果经统计分析表明：各处理组在日采食量、产蛋率、平均蛋重、料蛋比、蛋壳强度和哈夫单位等方面差异不明显,说明蛋鸡日粮中添加棕榈粕3.75%和5%,对蛋鸡生产性能和蛋品质量未产生显著影响。     

有机源锌和锰对蛋鸡生产性能、蛋壳和骨质量的影响

文章旨在研究日粮添加有机源锌和锰替代无机锌和无机锰对蛋鸡生产性能、蛋壳和骨骼质量的影响。试验选择31周龄产蛋性能接近的罗曼粉壳蛋鸡616只,随机分为7组,每组4个重复,每个重复22只。基础日粮锌和锰含量分别为50和30 mg/kg,对照组饲喂基础日粮,分别添加氧化锌和硫酸锰(锌40 mg/kg,锰60 mg/kg)。处理组分别在基础日粮中添加20 mg/kg有机锌,30 mg/kg有机锰、20 mg/kg有机锌+30 mg/kg有机锰、40 mg/kg有机锌、60 mg/kg有机锰、40 mg/kg有机锌+60 mg/kg有机锰,上述含量均以相应元素计。试验共进行7周。结果显示:日粮用有机锌或锰替代50%或100%无机锌、锰对蛋鸡生产性能相关参数均无显著影响(P> 0.05)。对照组相比,有机锌或锰替代无机锌或锰的比例对32、46、60和74周龄蛋鸡蛋壳相对重量、蛋壳密度和蛋壳厚度均无显著影响(P> 0.05)。与对照组相比,30 mg/kg有机锰、20 mg/kg有机锌+30 mg/kg有机锰组的蛋壳强度显著提高(P <0.05)。40 mg/kg有机锌+60 mg/kg有机锰组较无机锌、锰组显著提高了60、74周龄及全期蛋壳强度(P <0.05)。日粮添加有机锌或锰对胫骨物理参数及胫骨和趾骨灰分含量均无显著影响。结论 :日粮添加有机锌、锰替代无机锌锰对蛋鸡产蛋性能和骨质量无影响,但可以降低蛋鸡由于年龄升高对蛋壳强度的负面影响。     

日粮添加甜菜碱对夏季高温蛋鸡生产性能、蛋品质及血液理化特征的影响

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...     

酵母菌培养物对蛋鸡生产性能及蛋品质的影响

270只19周龄的ISABrow母鸡随机分3组处理,每个处理5个重复,研究酵母培养物对产蛋鸡产蛋性能和蛋品质的影响。试验为期16周。酵母培养物在试验中的添加水平分别为0%、0.1%、0.2%。试验中采用的玉米-豆粕型基础日粮中粗蛋白质为16.0%,能量为2800kcal/kg。试验结果表明,饲喂添加0.1%酵母培养物组产蛋鸡的生产性能和每日产蛋量显著提高(P<0.05);各处理组之间的蛋重、饲料摄入和饲料转化率无显著差别;试验组与对照组的蛋壳质量、哈氏单位、蛋黄颜色和蛋黄中脂肪酸含量也无显著差别。     

菜籽粕对蛋鸡生产性能与屠宰性能的影响

选择756羽开产50周左右的罗曼蛋鸡,随机均分7组,对照组使用船牌公司配合饲料,试验1～6组分别添加7.5%、8.0%、8.5%、9.0%、9.5%和10.0%的双低菜籽粕,进行饲养试验与生长测定,探索改善蛋鸡生产性能与蛋品质含量的双低菜籽饼(粕)最佳使用量,为充分利用贵州省丰富的菜籽饼(粕)资源奠定基础。结果显示,日粮中添加10%以下的双低菜籽粕对蛋鸡的采食、生长性能、蛋的性状均无不良影响,反而会提高蛋鸡的产蛋率,增加蛋重、降低料蛋比,其中试验4组的料蛋比(2.30)最低,平均日采食量也较低,平均蛋重较重,产蛋率也偏高。研究表明,蛋鸡日粮中添加9.0%双低菜籽粕对提高蛋鸡生长性能与产蛋性能具有良好效果。     

Effect of dietary digestible lysine concentration on performance,egg quality,and blood metabolites in laying hens

An experiment was conducted to evaluate the effect of dietary digestible lysine concentration on productive performance, egg quality, and blood metabolites in laying hens. A completely randomized block design was performed with 5 treatments and 6 replicates of 8 Hy-line W-36 hens each, from 32 to 44 wk of age. The treatments were 5 digestible lysine concentrations (0.657, 0.707, 0.757, 0.807, and 0.857% of diet). Feed intake was significantly increased with each increment in dietary digestible lysine concentration. Significant improvement in egg production, egg weight, egg mass, Haugh unit, and FCR were observed by an increase in lysine intake. Dietary lysine concentration did not have a significant impact on percentage of egg components, specific gravity, eggshell thickness, DM, and protein constituents of eggs. Dietary digestible lysine concentration did not have a significant effect on triglyceride, cholesterol, high-density lipoprotein (HDL), low-density lipoprotein (LDL), uric acid, and total protein in plasma. The digestible lysine requirements for optimal egg production, egg mass, and egg weight (32 to 44 wk of age), based on the linear broken-line regression analysis, were 814, 810 and 778 (mg/b/d), respectively. Whereas, these values were 4, 3.9, and 6 percent less than those estimated by the quadratic broken-line model, respectively.     

复合型抗应激添加剂对夏季蛋鸡产蛋性能、蛋品质及血清生化指标的影响

为了研究复合型抗应激添加剂对夏季蛋鸡产蛋性能、蛋品质及血清生化指标的影响,试验选用120只42周龄伊莎褐蛋鸡,随机分为2组,每组设6个重复,每个重复lO只;对照组饲喂基础日粮,试验组饲喂基础日粮＋80mg／kg复合型抗应激添加剂——禽专用添佳安肽,试验期为60d。结果表明：与对照组相比,试验组产蛋率显著提高5．56％（P〈0．05）,料蛋比显著降低4．74％（P〈0．05）,但对采食量和平均蛋重无显著影响（P〉0．05）;试验组蛋壳强度显著提高15．27％（P〈O．05）,但对蛋壳厚度、蛋白高度、哈夫单位无显著影响（P〉0．05）;试验组血清皮质醇水平显著下降53．91％（P〈0．05）,T_3、T_4水平分别显著下降20．12％、23．57％（P〈0．05）,尿素氮水平显著下降35．35％（P〈0．05）,但对血糖水平无显著影响（P〉0．05）。说明蛋鸡日粮中添加复合型抗应激添加剂——禽专用添佳安肽,具有显著抗热应激效应和增加蛋鸡采食量的作用。     

桑树叶粉作为饲料蛋白原料对蛋鸡生产性能和蛋品质的影响

文章旨在研究不同水平的烘干桑树叶粉对产蛋鸡生产性能和蛋品质的影响。试验选择产蛋性能一致的26周龄海兰粉壳蛋鸡900只,随机分为4组,每组5个重复,每个重复45只鸡。试验采用单因素试验设计,共含4种日粮。对照组饲喂玉米-豆粕型日粮,3个处理组分别在基础日粮中添加10%、15%和20%的桑树叶粉,试验共开展12周。结果:日粮中桑树叶粉添加水平显著影响蛋鸡的生产性能(P<0.05);随着桑树叶添加水平的升高,蛋鸡产蛋率、采食量、蛋重和平均蛋重显著降低(P<0.05)。随着桑树叶粉添加水平的升高,鸡蛋哈夫单位显著提高(P<0.05),蛋黄和蛋壳重量显著降低(P<0.05);32周龄鸡蛋蛋黄颜色L、a、b评分显著升高(P<0.05),20%桑树叶粉组蛋黄颜色L、a、b评分最高(P<0.05)。日粮添加10%~20%桑树叶粉较对照组均显著提高了38周龄鸡蛋蛋黄颜色L、a、b评分(P<0.05),其中蛋黄颜色L和a评分随桑树叶粉添加水平的升高显著升高(P<0.05)。结论:日粮桑树叶粉添加水平可以达到10%,其对蛋鸡的产蛋性能和蛋品质无负面影响。蛋鸡日粮添加桑树叶粉可以提高产蛋高峰期鸡蛋蛋黄的着色效果。