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[微量元素揭秘] 有机硒可以促进对虾生长及提高对桃拉综合症病毒病的抗病能力

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kk 发表于 2013-10-28 17:32:33 | 显示全部楼层 |阅读模式
             分享一个试验研究,个人觉得很有意思。本试验在基础饲料中添加硒可以提高对虾TSV攻毒后的存活率。但是无机硒对对虾生长性能没有产生正面影响,而添加有机硒却还能促进对虾生长。因此,可以推测在集约化对虾养殖中选择添加有适量酵母硒的多矿预混料的配合饲料,一定程度上可以提高养殖户的综合经济效益。

                               有机硒可以促进对虾生长及提高对桃拉综合症病毒病的抗病能力,亚洲科学,2011, (37): 24–30.
摘要:为了检验硒对对虾生长,及桃拉综合症病毒(TSV)攻毒后的抗病力的影响。将一批易受桃拉综合症病毒感染的太平洋白对虾(南美白对虾)分组分别饲喂3种不同的饲料:(1)不添加Se的标准对虾商业饲料(0.58ppm Se含量)(标准饲料组);(2)在标准商业饲料中添加0.3ppm 无机Se(无机硒组);(3)标准商业饲料中添加0.3ppm 有机Se(有机硒组),饲养5周。分别于试验开始前,及饲喂1周后、2周后、3周后对3个试验组的每个重复的对虾进行称重、测体长,和血液粒细胞数。饲喂试验结束后,剩下的对虾用来进行桃拉综合症病毒(TSV)的攻毒试验。经过5周的饲喂试验后,不同处理组对虾的平均重量产生了显著差异(P<0.05),标准饲料组对虾均重7.2±1.2g,无机硒组对虾均重6.1±1.2g,有机硒组对虾均重9.0±1.1g。只有有机硒组在饲喂3周后总血细胞和粒细胞数出现显著增加。TSV攻毒6天后,有机硒组对虾存活率(66.7%)显著高于无机硒组(35.5%)和标准饲料组(13.3%)。巢式RT-PCR分析结果显示,有机硒组(2/5)重度感染的对虾数比无机硒组(4/5)和标准饲料组(4/4)更低。RT-PCR结果和组织学检测结果相似。从存活的对虾中分离出的总血细胞和粒细胞数,标准饲料组显著低于有机硒组和无机硒组。此结果表明,添加有机硒可以促进对虾的生长和提高TSV攻毒后的存活率。
备注:此试验用的有机硒为酵母硒。

下面是原文:
Kallaya Sritunyalucksana, Angkul Intaraprasong,etc.Organic selenium supplementation promotes shrimp growth and disease resistance to Taura syndrome virus,ScienceAsia, 2011, (37): 24–30. ABSTRACT: To examine the effect of selenium (Se) supplementation on shrimp growth and disease resistance after Taura Syndrome virus (TSV) challenge, groups of Pacific white shrimp (Penaeus vannamei) from a strain known to be susceptible to TSV were fed 3 diets: (1) standard commercial shrimp feed (0.58 ppm Se content) without Se supplementation (standard diet group); (2) standard commercial feed plus 0.3 ppm inorganic Se (Inorg Se-group); and (3) standard commercial feed plus 0.3 ppm organic Se (Org Se-group) over a 5-week period. Samples (3 shrimp) were collected from all replicates before feeding (pre-feeding or week 0) and at the 1st, 2nd, and 3rd weeks post feeding to determine weight, length, and number of granular haemocytes. After the feeding trial, the remaining shrimp were used for a final TSV challenge test. Significant differences in weight between groups (P < 0.05) were found on the fifth week post feeding in which the average weight of shrimp fed the standard feed was 7.21.2 g compared to 6.11.2 g in the inorg Se-group and 9.01.1 g in the org Se-group. Significant increase in the number of total haemocytes and granular haemocytes (GHs) were found only in the org Se-group on the third week post feeding. On day 6 post TSV challenge, the number of survivors in the org Se-group (66.7%) was also significantly higher than those of the inorg Se- (35.5%) and standard diet- (13.3%) group. Nested RT-PCR analysis showed that the number of shrimp with severe infection in the org Se-group (2/5) was less than the inorg Se- (4/5) and standard diet-group (4/4). The RT-PCR results were similar to those observed by histological examination. The number of total haemocytes and GHs isolated from survivors of the standard diet-group were significantly lower than those isolated from survivors of the inorg Se- or org Se-group. The present results indicated that organic Se supplementation in shrimp feed could improve shrimp growth and survival after an experimental challenge with TSV.

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