Aliarabi Hassan, Fadayifar Amir, Tabatabaei Mohammad Mehdi, Zamani Pouya, Bahari Aliasghar, Farahavar Abbas, Dezfoulian Amir Hossein
Department of Animal Science, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Islamic Republic of Iran.
Department of Veterinary Medicine, Faculty of Paraveterinary Sciences, Bu-Ali Sina University, Hamedan, Islamic Republic of Iran.
Biol Trace Elem Res. 2015 Nov;168(1):82-90. doi: 10.1007/s12011-015-0345-0. Epub 2015 Apr 25.
This experiment was conducted to study the effects of different sources of zinc (Zn) on blood metabolites and balances of some minerals in lambs. In the first part, 20 6-7-month-old lambs were randomly allotted to four treatments including (1) basal diet containing 22.47 mg Zn/kg DM without supplementary Zn (control), (2) basal diet + 40 mg Zn/kg DM as ZnSO4 (ZnSO4 40), (3) basal diet + 20 mg Zn/kg DM as Zn-proteinate (Zn-Pro 20), and (4) basal diet + 40 mg Zn/kg DM as Zn-proteinate (Zn-Pro 40). Blood samples were taken on days 0, 28, and 65 before morning feeding. In the second part, four lambs from each treatment were randomly transferred to metabolic cages to evaluate the effects of different sources of Zn on N, Zn, Fe, and Cu retentions. This trial consisted of 18 days, with the first 12 days as the adaptation period followed by 6 days of sample collection. The results of this study showed that the source of Zinc had no significant effect on the analyzed parameters. Average daily gain and feed efficiency were improved by Zn supplementation (P < 0.05). Daily feed intake, plasma glucose, Fe and Cu concentrations, serum total antioxidant capacity, red blood cell count, packed cell volume, and hemoglobin concentration did not differ significantly between treatments (P > 0.05). Plasma Zn concentration, alkaline phosphatase (ALP) and bone-specific alkaline phosphatase (BALP) activity, and white blood cell and lymphocyte count differed significantly between control and Zn-supplemented groups (P < 0.05) as Zn supplementation improved these parameters. Nitrogen, Fe, and Cu retentions did not differ between treatments (P > 0.05). Zinc retention showed a significant difference between control and Zn-supplemented groups (P < 0.05), but there were no significant differences among the Zn-supplemented groups. The results of this study show that Zn supplementation improved performance and zinc retention in lambs. However, there were no significant differences between zinc sources used in this study.
本试验旨在研究不同锌源对羔羊血液代谢产物及某些矿物质平衡的影响。第一部分，将20只6 - 7月龄羔羊随机分为4组，处理如下：(1)基础日粮，含锌量为22.47 mg/kg干物质，不额外添加锌（对照组）；(2)基础日粮 + 40 mg/kg干物质硫酸锌（硫酸锌40组）；(3)基础日粮 + 20 mg/kg干物质蛋白锌（蛋白锌20组）；(4)基础日粮 + 40 mg/kg干物质蛋白锌（蛋白锌40组）。在第0、28和65天早晨饲喂前采集血样。第二部分，从每个处理组中随机选取4只羔羊转移至代谢笼，以评估不同锌源对氮、锌、铁和铜存留率的影响。本试验为期18天，前12天为适应期，随后6天进行样品采集。本研究结果表明，锌源对所分析参数无显著影响。添加锌提高了平均日增重和饲料效率（P < 0.05）。各处理组间日采食量、血浆葡萄糖、铁和铜浓度、血清总抗氧化能力、红细胞计数、血细胞比容和血红蛋白浓度无显著差异（P > 0.05）。对照组与补锌组之间血浆锌浓度、碱性磷酸酶（ALP）和骨特异性碱性磷酸酶（BALP）活性以及白细胞和淋巴细胞计数存在显著差异（P < 0.05），因为补锌改善了这些参数。各处理组间氮、铁和铜的存留率无差异（P > 0.05）。对照组与补锌组之间锌存留率存在显著差异（P < 0.05），但补锌组之间无显著差异。本研究结果表明，添加锌提高了羔羊的生产性能和锌存留率。然而，本研究中使用的锌源之间无显著差异。
