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

Effect of 2-hydroxy-4-(methythio) Butanoic Acid on Performance,Egg Quality,Nutrient Utilization and Serum Bio-parameters in Laying Hens

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。

The experiment was conducted to evaluate the effects of 2-hydroxy-4- （methythio） butanoic acid （HMB） on laying hen performance, egg quality, nutrient utilization and serum bio-parameters. There were four treatments： treatment 1 was fed the basal diet （Met 0.22%, Met＋Cys 0.48%）; treatment 2 was supplemented with DL-methionine （DLMet） 1.325 g/kg; treatment 3 or 4 was supplemented with HMB 1.500 g/kg or 0.750 g/kg respectively on the molecular basis to DL-Met. After fed the basal diet for 10 days, 600 healthy 38-week-old Roman laying hens were allotted to 4 treatments randomly, with 5 replicates in each treatment and 30 birds in each replicate. The trial lasted 10 weeks. Compared with the control group, treatment 2, 3 and g had higher average egg weights （P 〈 0.01）, egg masses （P 〈 0.01）, lower feed/egg ratio （P 〈 0.01）, higher laying rate （treatment 2： P 〉 0.05; treatment 3 and 4： P 〈 0.05） in the phase of 3-10 week, and higher apparent metabolic rates of dry matter （P 〈 0.01）, Ca （P 〈 0.01）, crude protein （P 〈 0.01） and P （treatment 2 and 3： P 〈 0.01; treatment 4： P 〈 0.05）. The feed intake was not affected （P 〉0.05）. The values of egg form parameter, eggshell intension, eggshell thickness, eggshell weight, yolk weight, yolk percentage, Hoff unit, moisture and crude protein content in eggs were not significantly different among the treatments （P 〉0.05）. There was no significant difference between DL-Met and HMB on performance, egg quality and nutrient utilization （P 〉0.05）. It was implicated that DL-Met could be replaced by HMB on molecular basis in laying hens diets. The bio-efficacy of HMB was similar to DL-Met.