低温下蛋氨酸及其羟基类似物对蛋鸡生产性能及蛋品质的影响

在低温(5℃)的条件下,通过向饲料中添加DL-蛋氨酸(DLM)和蛋氨酸羟基类似物(LMA),考察不同蛋氨酸对产蛋高峰期海兰褐蛋鸡生产性能及蛋品质的影响。结果表明:低温(5℃)条件下,饲料中添加蛋氨酸可以缓解低温对蛋鸡造成的不利影响,蛋鸡体重降低缓慢,与对照组相比,产蛋率、平均蛋重和日蛋重显著提高,采食量和料蛋比显著降低。对蛋鸡的输卵管长度指数、重量指数没有显著影响。添加0.15%的DL-蛋氨酸和0.225%的蛋氨酸羟基类似物对蛋鸡的生产性能和蛋壳厚度的影响效果最好。     

蛋氨酸和蛋氨酸羟基类似物对猪的生物学效价

蛋氨酸缺乏日粮中添加DL-蛋氨酸和液体蛋氨酸羟基类似物增加了仔猪和生长猪的氮沉积，明显改善了仔猪的生产性能，这表明试验结果是在蛋敏感区域内测得。液体蛋氨酸羟基类似物对猪的相对生物学效价只有DL-蛋氨酸的65%，远低于液体蛋氨酸羟基类似物88%的商业含量。这些结果再次验证在家禽的研究结果，即液体蛋氨酸羟基类似物相对DL-蛋氨酸的效价只有65%。因此，液体蛋氨酸羟基类似物对猪的生物学效价只有65%。     

冬季常温鸡舍条件下DL-蛋氨酸及羟基类似物对蛋鸡产蛋性能的影响

在东北冬季蛋鸡舍常温15℃的条件下,通过向饲料中添加DL-蛋氨酸(DLM)和蛋氨酸羟基类似物(LMA),考察添加不同蛋氨酸对34周龄海兰褐蛋鸡生产性能及蛋品质的影响。结果表明:饲料中添加蛋氨酸可促进鸡体重缓慢增长,产蛋率、平均蛋重和日蛋重显著提高,采食量和料蛋比显著降低。对蛋鸡的输卵管长度指数及重量指数没有显著影响。饲料中添加0.15%的DLM和0.225%的LMA对蛋鸡的生产性能和蛋壳厚度的影响效果最好。     

DL-蛋氨酸羟基类似物和DL-Met对蛋鸡生产性能及蛋成分的影响

为研究两种DL-蛋氨酸羟基类似物(MethionineHydroxyAnalogue)(DL-MHA)和DL-Met对蛋鸡生产性能的影响,将31周龄产蛋率为92%的204只罗曼粉蛋鸡按体重、产蛋率一致的原则随机分成4个处理组,每个处理组3个重复,每个重复17只鸡。4个处理组分别饲喂低蛋氨酸基础日粮(对照组)、添加0.12%蛋氨酸羟基类似物产品Sumime(t简称Sum)的日粮(Sum组)、添加0.12%蛋氨酸羟基类似物产品P的日粮(P组)、以及添加0.1%DL-Met的日粮(DLM组)。试验结果表明,Sum和P处理组在平均蛋重、产蛋率、日均采食量、饲料转化率、鸡蛋中氮沉积、体重增加及鸡蛋内容物干物质含量与DL-Met处理组基本相当,差异均不显著(P>0.05),但3个蛋氨酸处理组的上述指标均极显著高于对照组(P<0.01)。3处理组与对照组的鸡蛋内容物粗蛋白含量(DM基础)、各种氨基酸含量(DM基础)和氨基酸组成模式基本一致,差异不显著(P>0.05)。这表明:等摩尔的DL-MHA和DL-Met对蛋鸡生产性能的影响相当;日粮蛋氨酸水平会改变鸡蛋内容物干物质含量,但对鸡蛋内容物干物质中粗蛋白(CP)的含量和蛋白质的氨基酸组成无影响。     

高蛋氨酸水平可以增加蛋重

高蛋氨酸水平可以增加蛋重根据Ｄ．Ｊ．ｓｈａｆｅｒ．等人报道，将蛋氨酸按０．３８％、０．４６％和０．５３％的水平喂商品蛋鸡，高蛋氨酸日粮能提高蛋重。试验中所用蛋氨酸是蛋氨酸羟基类似物（钙盐）。不同水平之间，蛋黄固体部分差异不显著。对产蛋率、饲料转化率或...     

不同来源蛋氨酸添加剂对肉鸡生产性能的影响

试验比较了固态蛋氨酸和液态蛋氨酸羟基类似物在肉鸡上的应用效果。选取1日龄平均初始重为(47.2±2)g的Avain肉鸡990只,随机分为2个处理,每个处理15个重复,每个重复33只鸡。处理A添加固态蛋氨酸羟基类似物,纯度为99%(以下简称固蛋),处理B添加液态蛋氨酸羟基类似物,含量为88%(以下简称液蛋),配制日粮时用100g液蛋代替88g固蛋。试验结果表明:试验全期及0~2w、3~4w、5~6w3个阶段两个处理肉鸡的个体质量、日增重、料肉比、采食量等生产性能均无显著差异(P>0.05)。3~4w固蛋组的死亡率显著大于液蛋组(P<0.05),其余各阶段及试验全期两个处理的死亡率无显著差异(P>0.05)。添加固蛋或液蛋每千克增重的饲料成本相差不大,固蛋组比液蛋组低0.38%,经济效益稍好。     

不同锌源对绿壳蛋鸡产蛋性能和蛋黄锌含量的影响

选取180只东乡黑羽绿壳蛋鸡随机分成3组,每组6个重复,每个重复10只。A组为对照组,饲喂基础日粮,B组、C组分别在基础日粮基础上添加120 mg/kg的羟基蛋氨酸锌和碱式氯化锌(按锌含量计)。预试期7 d、正式期28 d。结果表明,与对照组相比,日粮中添加羟基蛋氨酸锌可显著提高蛋鸡产蛋率(P<0.05);碱式氯化锌可极显著提高蛋鸡产蛋率(P<0.01),显著降低料蛋比(P<0.05);试验各组的蛋壳厚度、蛋黄指数、蛋形指数、哈氏单位差异均不显著;两种锌源均可极显著提高蛋黄中锌含量,试验第28天时,分别较对照组提高32.8%和32.3%(P<0.01)。由此可见,日粮中添加羟基蛋氨酸锌和碱式氯化锌均能改善蛋鸡生产性能,提高鸡蛋中锌含量,综合比较,添加碱式氯化锌效果更好。     

液体蛋氨酸羟基类似物对蛋鸡生产性能、鸡蛋品质、养分利用率和血液生化指标的影响

试验用38周龄健康的罗曼粉壳蛋鸡600只,经饲喂玉米-豆粕-麦麸型基础日粮(蛋氨酸0.22%、蛋氨酸+胱氨酸0.48%)10d后,随机分为4个处理,每个处理5个重复,每个重复30只蛋鸡。处理1为对照组,饲喂基础日粮;处理2在每千克基础日粮中添加1.325gDL-Met;处理3和处理4以液体蛋氨酸羟基类似物(HMB,活性物质88%)在等摩尔基础上按100%或50%分别替代处理2的DL-Met。试验期10周。试验结果表明:在基础饲粮中添加DL-Met以满足高产蛋鸡的蛋氨酸需要可提高3～10周的产蛋率,并极显著地提高了3～10周的蛋重、日产蛋重、干物质、钙、磷和粗蛋白的表观代谢率(P<0.01),极显著降低了饲料转化率比(P<0.01),对采食量、鸡蛋蛋形指数、破蛋率、软蛋率、蛋黄重、蛋黄比例、哈氏单位、蛋壳重、蛋壳厚度、蛋壳强度、鸡蛋水分和粗蛋白含量无显著影响(P>0.05)。在等摩尔基础上HMB以100%或50%替代DL-Met,对蛋鸡生产性能、鸡蛋品质和养分代谢率的影响与DL-Met无显著差异。结果表明在蛋鸡玉米-豆粕-麦麸型饲粮中HMB的生物学效价与DL-Met相同。     

蛋氨酸羟基类似物对断奶仔猪日粮系酸力的影响

本研究采用实验室分析法,探讨在不同蛋白质水平的断奶仔猪日粮中添加蛋氨酸羟基类似物(LMA)对日粮系酸力的影响。试验参照我国断奶仔猪营养需要标准分别配制21%、19%和17%的三个蛋白质水平日粮,在三种基础日粮中分别添0.12%、0.24%和0.36%三个水平的LMA,实测各组日粮蛋白质水平及系酸力。试验结果表明:断奶仔猪日粮中添加蛋氨酸羟基类似物后,日粮系酸力较对照组降低了2.58%~11.09%;随着LMA在饲料中添加量的增加,饲料的系酸力呈逐渐下降的趋势;降低日粮蛋白质水平,可使日粮系酸力降低;设计日粮配方时,同时降低日粮蛋白质水平和提高LMA添加量,可使日粮系酸力更低,表现正相关性。因此,在低蛋白质日粮中选用液体蛋氨酸羟基类似物作为蛋氨酸源使日粮系酸力降低,可节约外源性酸化剂的添加量。     

日粮蛋氨酸和赖氨酸水平对产蛋高峰期京红蛋种鸡生产和繁殖性能的影响

试验研究玉米-豆粕型日粮不同蛋氨酸和赖氨酸水平对京红1号蛋种鸡生产及繁殖性能的影响。将1728只24周龄京红1号蛋种鸡,按3×3试验设计(蛋氨酸0.33%、0.38%、0.43%,赖氨酸0.75%、0.85%、0.95%),设9个处理(每处理4个重复,每重复48只),试验期16周。结果表明:试验16周后,随日粮蛋氨酸水平增加,能够显著提高了蛋鸡的产蛋率、产蛋量,且降低料蛋比(P<0.05);随日粮赖氨酸水平增加,蛋鸡产蛋率显著增加(P<0.01)。除蛋重外,日粮蛋氨酸和赖氨酸水平对其他生产性能指标均有显著互作效应(P<0.05),且以0.43%蛋氨酸和0.95%赖氨酸组(处理9)产蛋率、产蛋量最高。蛋氨酸和赖氨酸对蛋种鸡繁殖性能无显著互作,试验4周后,日粮蛋氨酸水平对孵化率、健雏率有显著影响(P<0.05),母雏率随赖氨酸水平增加而改善。处理9种蛋净利润最高为0.6126元/(d.只)。综上,日粮蛋氨酸水平为0.43%,赖氨酸水平为0.95%时,京红1号蛋种鸡产蛋高峰期生产性能最佳,种蛋利润最大。     

Effects of dietary methionine source on productive performance, blood chemical, and hematological profiles in broiler chickens under tropical conditions

This study was conducted to investigate the effects of supplementation of dl-methionine (DLM) and liquid dl-methionine hydroxy analog free acid (MHA) in diets on productive performance, blood chemical, and hematological profiles in broiler chickens under tropical conditions. In all, 216 commercial male broiler chicks were used to compare two dietary methionine sources, DLM and MHA. Chicks were raised for 35 days in battery cages situated in high ambient temperature and relative humidity open-side housing. The chicks were divided into three treatments in six replications with 12 chicks each. A completely randomized design was used. The treatment groups were (1) control group (methionine and total sulfur amino acid deficient diet), (2) supplementation of DLM as the methionine source in diet, and (3) supplementation of MHA as the methionine source in diet. The productive performance of DLM and MHA was not significantly different. Both supplementation of DLM and MHA significantly improved final body weight, body weight gain, average daily gain, and feed conversion ratio when compared to the control group (P?<?0.01). Both DLM and MHA supplementation significantly increased the plasma cystine concentration level (P?<?0.05). The use of DLM enhanced the plasma methionine concentration (P?<?0.01) and increased the heterophil/lymphocyte ratio (P?<?0.05). While MHA elevated the plasma taurine and uric acid concentration levels (P?<?0.05). In conclusion, under tropical conditions, there was no significant difference between DLM and MHA supplementation on productive performance; plasma methionine concentration was increased by DLM supplementation, while plasma taurine and uric acid concentration were significantly increased by MHA supplementation.     

Bioavailability Estimation of DL-Methionine Hydroxy Analogue Relative to DL-Methionine in Layers Fed Milo-Soybean Diets Using Different Regression Models

The bioavailability of liquid DL-methionine hydroxy analogue-free acid (MHA-FA) relative to dry DL-methionine (DLM) in laying hens was estimated using milo-soybean diets, which were formulated to have low methionine and cystine content to increase the sensitivity of methionine deficiency. Five graded supplemental levels of methionine (0.02, 0.04, 0.06, 0.08, and 0.10%) from DLM or MHA-FA were added to the basal diet containing 0.20% methionine on an equimolar basis. Five different models were used to determine the bioavailability of MHA-FA relative to DLM. Three of the models were exponential models with supplemental methionine concentration on a weight basis, supplemental methionine intake on a weight basis, and supplemental methionine intake on a molar basis as the independent variable, respectively. Two of the models were sloperatio models with supplemental methionine intake on a weight basis or supplemental methionine intake above basal diet on a weight basis as the independent variable. The results of the regression analysis indicated average bioavailabilities were 122 (egg production), 109 (egg mass), and 89% (egg weight) on a weight basis or 139 (egg production), 124 (egg mass), and 101% (egg weight) on a molar basis. All bioavailability values were not different (P > 0.05) from 88% on weight basis or 100% on a molar basis but were different (P < 0.05) from 65% on weight basis or 74% on a molar basis.     

植物乳杆菌对致病性肠炎沙门氏菌感染蛋鸡的生产性能及其蛋、粪含菌量的影响

试验旨在研究植物乳杆菌（Lactobacillus plantarum,LP）对致病性肠炎沙门氏菌（Salmonella enteric,SE）感染蛋鸡的生产性能和鸡蛋、粪中病菌残留的影响。选用144只50周龄农大3号蛋鸡,分4个组,每组4个重复,每个重复9只鸡。空白对照组和阳性对照组饲喂基础日粮;土霉素组在基础日粮中添加5 mg/kg土霉素;乳杆菌组在基础日粮中添加10⁹ CFU/kg植物乳杆菌。阳性对照组、土霉素组和乳杆菌组蛋鸡在试验第22和24天口腔接种1 mL沙门氏菌（10⁹CFU/mL）,试验期50 d。结果显示：攻毒前,各组生产性能指标无显著差异（P>0.05）;攻毒后,与空白对照组相比,感染前期阳性对照组平均蛋重显著降低（P < 0.05）,料蛋比显著升高（P < 0.05）,鸡蛋中沙门氏菌带菌率和粪中沙门氏菌含菌量显著升高（P < 0.05）。与阳性对照组相比,感染前期土霉素组和乳杆菌组蛋鸡平均蛋重分别提高5.43%（P < 0.05）、9.64%（P < 0.05）,料蛋比分别降低11.51%（P < 0.05）、5.16%（P > 0.05）;感染后期乳杆菌组料蛋比降低9.96%（P < 0.05）,乳杆菌组鸡蛋中沙门氏菌带菌率和粪中沙门氏菌含菌量分别比阳性对照组降低43.17%、23.93%（P < 0.05）。空白对照组、乳杆菌组和土霉素组间生产性能和鸡蛋大肠杆菌、沙门氏菌带菌率均无显著差异（P > 0.05）。以上结果表明,日粮中添加植物乳杆菌和土霉素均可改善沙门氏菌感染蛋鸡的生产性能,降低鸡蛋和粪中的沙门氏菌含量,提高家禽抗感染能力。植物乳杆菌具有无污染、无残留的特点,可作为家禽养殖中理想的抗生素替代品。     

“京粉6号”商品蛋鸡产蛋期适宜蛋白、蛋氨酸水平的研究

为研究“京粉6号”商品蛋鸡产蛋期日粮适宜的粗蛋白质和蛋氨酸水平,试验选取31周龄“京粉6号”商品蛋鸡1200只,随机分为5个处理,每个处理5个重复,每个重复48只鸡。处理I组蛋白15.5%、蛋氨酸0.37%|处理II组蛋白15%、蛋氨酸0.37%|处理Ⅲ组蛋白14.5%、蛋氨酸0.37%|处理IV组蛋白15.5%、蛋氨酸0.33%|处理V组蛋白15.5%、蛋氨酸0.30%。试验前收集2周基础数据,正式试验期为33 ~ 72周龄。结果表明：日粮粗蛋白质及蛋氨酸水平对产蛋期体重、产蛋率、破蛋率及料蛋比无显著影响（P > 0.05）|平均蛋重随日粮蛋白及蛋氨酸水平的降低而降低,且能显著降低45 ~ 72周龄平均蛋重（P < 0.05,P < 0.01）,对蛋重具有显著调控作用。综合“京粉6号”平均55 g蛋重的特色需求,日粮粗蛋白质水平为15%、蛋氨酸为0.33%可获得最佳生产性能及经济效益。 [关键词] 京粉6号|产蛋期|粗蛋白质|蛋氨酸     

蛋氨酸缺乏对蛋鸡产蛋后期生产性能、血清游离氨基酸含量和肝脏蛋氨酸代谢相关基因表达的影响

本试验旨在研究蛋氨酸缺乏对蛋鸡产蛋后期生产性能、血清游离氨基酸含量和肝脏蛋氨酸代谢相关酶基因表达的影响。选取180只62周龄的海兰灰蛋鸡,根据产蛋率均匀分成3组(每组6个重复,每个重复10只):对照组饲喂蛋氨酸水平为0.33%的饲粮,蛋氨酸缺乏组分别饲喂蛋氨酸水平为0.21%和0.27%的饲粮,试验期90d。结果表明:1)饲粮蛋氨酸缺乏显著降低了蛋鸡的平均日采食量、产蛋率、平均日产蛋重、平均蛋重和不合格蛋率(P0.05),显著提高了料蛋比(P0.05)。2)蛋氨酸缺乏显著降低蛋鸡血清中蛋氨酸的含量(P0.05)。0.21%蛋氨酸组蛋鸡血清中丝氨酸、甘氨酸和丙氨酸的含量显著高于其他2组(P0.05)。0.27%蛋氨酸组蛋鸡血清中缬氨酸、异亮氨酸和精氨酸的含量显著低于对照组(P0.05),脯氨酸的含量显著低于0.21%蛋氨酸组(P0.05)。3)与对照组相比,0.21%蛋氨酸组蛋鸡肝脏中DNA甲基转移酶1、N6-甲基腺苷(m6 A)甲基转移酶3(METTL3)和m6 A甲基转移酶14的表达量显著提高(P0.05),0.27%蛋氨酸组蛋鸡肝脏中METTL3的表达量显著提高(P0.05)。4)与对照组相比,0.21%蛋氨酸组蛋鸡肝脏中甲硫氨酸腺苷转移酶1a、5-甲基四氢叶酸-同型半胱氨酸甲基转移酶(MTR)和胱硫醚-β-合成酶的表达量显著提高(P0.05),0.27%蛋氨酸组蛋鸡肝脏中MTR的表达量显著提高(P0.05)。蛋氨酸缺乏对蛋鸡肝脏甲硫氨酸腺苷高半胱氨酸酶和甜菜碱高半胱氨酸甲基转移酶的表达量无显著影响(P0.05)。由以上结果可知:蛋鸡饲粮高水平的蛋氨酸缺乏会降低蛋鸡的生产性能,可能与蛋氨酸缺乏改变蛋氨酸代谢途径,影响DNA和RNA的甲基化过程有关。     

Effect of methionine hydroxy analog-free acid on growth performance and chemical composition of liver of broiler chicks fed a corn–soybean based diet from 0 to 6 weeks of age

The experiment was carried out to determine the effects of liquid DL‐methionine hydroxy analog‐free acid (LMA) and dry DL‐methionine (DLM) on growth performance, carcass quality and chemical composition of the livers of broiler chicks during 0–6 weeks of age. Four hundred and fifty male commercial broiler chicks (Ross strain) were used. The chicks were divided into three groups, and each group consisted of six replicates of 25 chicks each. The chicks were kept in floor pens, and water and feed were supplied ad libitum throughout the experiment. Three experimental diets were provided as follows: (i) corn–soybean‐based diet deficient in methionine; (ii) methionine‐deficient corn–soybean‐based diet supplemented with DLM to meet the methionine requirements of broiler chicks; and (iii) methionine‐deficient corn–soybean‐based diet supplemented with LMA (1.25‐fold (w/w) the amount of DLM supplied to the second group, given an assumption that 100 units of liquid LMA can be replaced by 80 units DLM to give similar performance results). During the starter period, the weight gains of chicks fed LMA or DLM were significantly greater than those in chicks receiving the methionine‐deficient diet (P < 0.05), and the addition of LMA significantly improved weight gain compared with the addition of DLM. Adding DLM or LMA significantly improved the feed conversion ratio (FCR) and percentage of uniformity (P < 0.05). No significant differences between the effects of DLM and LMA on these parameters were found. During the grower period (3–6 weeks of age), weight gain, FCR, uniformity and feed intake of chicks that received diet supplemented with DLM or LMA were superior to those of the methionine‐deficient group (P < 0.05). Chicks fed LMA had the same bodyweight gain and uniformity as those fed DLM. However, adding LMA resulted in a significant increase of FCR resulting from excess feed consumption. Outer breast meat yields were significantly improved and abdominal fat was significantly decreased when methionine sources were added (P < 0.05), and adding LMA tended to promote edible meat growth better than did adding DLM. Although no significant effects of methionine sources on the chemical composition of the liver were seen, adding methionine sources tended to increase liver fat content. In conclusion, it seems that the bioefficacy of LMA relative to DLM is not less than 80%. Therefore, chicks fed with diet supplemented with 1.25‐fold (w/w) as much LMA as DLM might exceed requirements for growth performance, while meeting requirements for meat production. Moreover, the relative bioefficacies of LMA and DLM between the starter and grower periods may perhaps be different.     

蛋氨酸水平对开产期麻鸭产蛋性能、蛋品质及卵巢形态的影响

采用单因子随机分组试验设计,设6个蛋氨酸水平(0.25%、0.30%、0.35%、0.40%、0.45%和0.50%),探讨不同蛋氨酸水平对开产期蛋鸭产蛋性能、蛋品质及卵巢形态的影响。试验选用115日龄龙岩山麻鸭1 188只,分为6组,每组6个重复,每重复33只鸭,产蛋率达到50%开始正式试验,产蛋率80%结束,试验期21 d。结果表明:各组间平均蛋重随着饲粮蛋氨酸水平的提高而增加,并且0.30%～0.50%组显著高于0.25%组(P<0.05);饲粮蛋氨酸水平对试鸭日产蛋重产生显著影响(P<0.05),且日产蛋重与蛋氨酸水平之间存在显著的二次曲线相关(P<0.05)。各组间试鸭产蛋率、料蛋比、蛋品质、卵泡和输卵管形态未有显著差异(P>0.05)。以日产蛋重为评价指标,依据二次曲线模型,开产期麻鸭饲粮适宜蛋氨酸水平为0.40%,日摄入量为560 mg/d。蛋氨酸对开产期麻鸭蛋品质及卵巢形态未产生显著影响。     

Effects of Lactobacillus plantarum on Production Performance,Egg and Feces Bacteria content of Salmonella enteric-Infected Hens

The experiment was conducted to study the influence of Lactobacillus plantarum (LP) on production performance, egg and feces Salmonella enteric (SE) residues of SE-infected hens. 144 fifty-week-old Nongda No.3 hens were randomly allocated to 4 treatments with 4 replicates of 9 hens each. The hens in blank control and positive control groups were fed the basal diet, terramycin group, the basal diet with terramycin (5 mg/kg), LP group, the basal diet with Lactobacillus plantarum (10⁹CFU/kg). The hens in positive control, terramycin and LP groups were oral inoculated with 1 mL SE (10⁹CFU/mL) on 22 and 24 d. The experiment lasted for 50 d. Before being vaccinated, the production performance of each group showed no significant difference (P > 0.05); After being vaccinated, in early period, compared with blank control group, the average egg weight significantly decreased (P < 0.05), the feed-egg ratio significantly increased (P < 0.05), and the SE content of eggs and feces significantly increased (P < 0.05) in positive control group. Compared with positive control group, the average egg weight in terramycin group and LP group increased by 5.43% and 9.64% respectively (P < 0.05), while the feed-egg ratio decreased by 11.51% (P < 0.05) and 5.16% (P > 0.05) respectively. In later period, the feed-egg ratio in LP group decreased by 9.96% (P < 0.05), SE content of eggs and feces in LP group decreased by 43.17% and 23.93% respectively (P < 0.05). The production performance and E. coli, SE-carrying rates of eggs had no significant difference among the blank control, LP and terramycin groups (P > 0.05). The results indicated that, supplemented with Lactobacillus plantarum or terramycin could improve the production performance, reduce the SE content in eggs and feces, and improve the ability to resist infection in hens. Because Lactobacillus plantarum had the characteristics of no pollution and no residue, it could be used as a kind of ideal substitute for antibiotics in poultry production.     

蛋氨酸对开产蛋鸡生产性能及蛋品质的影响

以19周龄开产海兰褐蛋鸡为试验动物,采用饲养、屠宰试验和蛋品质分析测定等方法,研究蛋氨酸对开产蛋鸡生产性能及蛋品质的影响。结果表明:除添加0.4%组部分指标劣于对照组外,各试验组蛋品质均有不同程度提高,且以添加0.2%蛋氨酸水平组影响最显著,较对照组日均产蛋率、蛋壳厚度、蛋黄指数分别提高5.94%、9.0%、9.84%(P<0.05),料蛋比和蛋黄中胆固醇含量降低8.29%和1.67%(P<0.05)。