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1.
To evaluate the effects of duck hepatitis virus-1 (DHV-1) on the body weight gain in duck and the effects of silymarin on it in vivo, 100 10-d-old ducks, both male and female, were collected to be subjected to the test. The experiments were conducted in 8 groups: in group 1-3, the animals were inoculated with 1:105 diluted duck hepatitis virus (DHV-1) infected allantoic fluid and given 0, 30, and 50 mg kg^-1 BW d^-1 silymarin orally, respectively. In group 4-6, the animals were inoculated with 1:5 × 105 diluted DHV-1 infected allantoic fluid and given 0, 10, and 30 mg kg^-1 BW d^-1 silymarin orally, respectively. In group 7, the animals were given 10 mg kg^-1 BW d^-1 silymafin only. Group 8 was the control one treated by injecting sterillized saline into the leg muscles. All the silymarin was given from 0 to 4 d after inoculation of the virus. By the 5th d after inoculation, the vein blood was drawn from the dorsal foot vein and the plasma samples were collected and stored at -20℃. The body weight gain (BWG) was measured from 0 to 10 d after inoculation. The plasma IGF-I, T3, and T4 concentrations were measured by radioimmunoassay (RIA). At the virus dose of 1:5 ×105 diluted virus infected allantoic fluid, the inoculation of the virus enhanced the BWG significantly compared with that of the control (P〈 0.01), while 10-50 mg kg^-1 BW d^-1 silymarin could counteract the effects of the virus on the BWG dose-dependently. The plasma IGF-I levels showed no correlation with the BWG, but the T3 levels showed a same tropism with the body weight gain. The present results indicated that sublethal DHV-1 enhanced the body weight gain of ducklings significantly, and the silymarin could counteract this effect in vivo.  相似文献   

2.
A comparative slaughter trial was conducted to determine the net mineral requirements for maintenance and growth of Dorper crossbred female lambs raised from 20 to 35 kg of body weight(BW).Thirty-five Dorper×thin-tailed Han crossbred female lambs of(20.3±1.14) kg BW were used: 7 lambs were randomly chosen and slaughtered at the beginning of the experiment as the baseline group for measuring the initial body composition; another 7 lambs were randomly chosen and offered a pelleted mixed diet ad libitum and slaughtered at(27.0±0.73) kg BW; the remaining 21 lambs were randomly divided into 3 groups of 7 animals each and subjected to the same diet either ad l ibitum or at 70 or 40% of ad libitum intake.The 21 lambs were fed in 7 slaughter groups, with each group consisting of one lamb from each treatment(ad libitum, 70 or 40% of ad libitum intake).The 3 groups were slaughtered when the sheep fed ad libitum attained(33.8±0.52) kg of BW.The body composition of five minerals(Ca, P, Na, K, and Mg) was determined.The net mineral requirements for maintenance were 35.01, 25.18, 9.30, 31.35, and 2.03 mg kg–1 empty BW(EBW) for Ca, P, Na, K, and Mg, respectively, and the net growth requirement per kg of EBW gain ranged from 9.73 to 8.87 g of Ca, 5.83 to 5.27 g of P, 1.73 to 1.63 g of Na, 3.73 to 4.08 g of K, and 0.26 to 0.25 g of Mg for Dorper crossbred lambs in China, respectively.The estimates of mineral requirements with Dorper crossbred lambs in the current study were not consistent with the recommendations from previous studies.  相似文献   

3.
The net protein(NP) and metabolizable protein(MP) requirements of Dorper crossbred female lambs from 20 to 35 kg body weight(BW) were assessed in a comparative slaughter trial. Thirty-five Dorper×thin-tailed Han crossbred lambs weaned at approximately 50 d of age((19.1±2.37) kg of BW) were used. Seven randomly selected lambs were slaughtered at the beginning of the trial as baseline group(BL). An intermediate group of seven randomly selected lambs fed ad libitum(AL) intake was slaughtered when the lambs reached an average BW of 28.6 kg. The remaining 21 lambs were allotted randomly to three levels of dry matter intake: AL or restricted to 70 or 40% of the AL intake. All lambs were slaughtered when the sheep fed AL intake reached 35 kg of BW. Total body N and N retention were determined. The results showed that the maintenance requirements for NP and MP were 1.75 and 3.37 g kg~(–1) metabolic shrunk body weight(SBW0.75), respectively. The partial efficiency of protein use for maintenance was 0.52. The NP requirements for growth ranged from 10.9 to 42.4 g d~(–1) for the lambs gaining 100 to 350 g d~(–1) from 20 to 35 kg BW. The partial efficiency of MP for growth was 0.52. In conclusion, the NP and MP requirements for the maintenance and growth of Dorper crossbred female lambs were lower than those reported by AFRC(1993) and NRC(2007) recommendations.  相似文献   

4.
Selenium protects cells from oxidative damage and reduces lipopolysaccharide (LPS)-induced expression of inflammatory cytokines. Because inflammatory cytokines induce growth depression, we hypothesized that selenium-rich yeast (SeY) would inhibit growth depression caused by LPS. Twenty Meishan weanling pigs [28 (s.d. 2 d), 7.6 (s.d. 0.3 kg) body weight (BW)] were used in a 2×2 factorial design (n=5). The main factors were dietary Se sources [selenium-rich yeast (SeY) vs. sodium selenite (SSe)] with supplement level at 0.3 mg Se/kg, and immunological stress (LPS vs. saline). The experiment lasted for 28 d. On d 14 and d 21, half of pigs in each dietary treatment were intramuscularly injected with either 50 μg/kg BW LPS or an equivalent amount of sterile saline. Blood samples were collected at 3 h post-injection. There were no interactions between dietary Se sources and immunological stress on growth performance. LPS depressed average daily gain (ADG) (d 14-21, P〈0.05; d 21-28, P〈 0.01), and elevated feed to gain ratio (F/G) (d 21-28, P〈0.05), while SeY elevated ADG (d 0-14, P〈0.05; d 21-28 and d 0-28, P〈0.01), and decreased F/G (P〈0.01). Interactions were observed on interleukin-1β(IL-1β) and interleukin-6 (IL-6) from serum samples of d 14 and d 21 (P〈0.01), as well as superoxide dismutase (SOD) and insulin like growth factor (IGF-1) of d 21 (P〈0.05). In conclusion, SeY relieved the growth depression of piglets immunologically stressed by LPS, which maybe resulted from the decreased externalization of inflammatory cytokines and improved antioxidant status.  相似文献   

5.
Yeasts and organic minerals are used in diets to improve health, productive performance and some carcass characteristics of ruminants and non-ruminants. Thirty-two lambs(Pelibuey×Katahdin; BW=(30.55±1.67) kg; n=8) were used in a 56-d feeding experiment to study the effects of different levels of live yeast(Saccharomyces cerevisiae; yeast), selenium(Se) and chromium(Cr) mixed(Se-Cr), and a mixture of yeast-Se-Cr on growth performance and carcass traits. Animals were stratified by body weight(BW) and randomly assigned to one of four treatments: 1) control group(0.0 g kg–1 yeast); 2) yeast(1.50 g kg–1 dry matter intake(DMI) d–1); 3) Se-Cr premix(1.5 mg kg–1 DMI d–1 for each mineral); and 4) yeast-Se-Cr mixture. There were no treatment effects on final BW; whereas lambs fed Se-Cr or yeast-Se-Cr had higher(P<0.05) DMI than animals supplemented with only yeast. Average daily gain(ADG), gain:feed ratio, chop area, dorsal fat and carcass yield were similar(P>0.05) among treatment groups. In conclusion, supplementation with yeast, Se-Cr mixed or yeast-Se-Cr did not improve ADG, final BW, back fat content and carcass yield of growing of Pelibuey×Katahdin lambs. Supplementation with Se-Cr and yeast-Se-Cr increased DMI, and approximately 250 g ADG animal–1 d–1 was produced with no negative effects on growth and health of the animals.  相似文献   

6.
Yeasts and organic minerals are used in diets to improve health, productive performance and some carcass characteristics of ruminants and non-ruminants. Thirty-two lambs(Pelibuey×Katahdin; BW=(30.55±1.67) kg; n=8) were used in a 56-d feeding experiment to study the effects of different levels of live yeast(Saccharomyces cerevisiae; yeast), selenium(Se) and chromium(Cr) mixed(Se-Cr), and a mixture of yeast-Se-Cr on growth performance and carcass traits. Animals were stratified by body weight(BW) and randomly assigned to one of four treatments: 1) control group(0.0 g kg–1 yeast); 2) yeast(1.50 g kg–1 dry matter intake(DMI) d–1); 3) Se-Cr premix(1.5 mg kg–1 DMI d–1 for each mineral); and 4) yeast-Se-Cr mixture. There were no treatment effects on final BW; whereas lambs fed Se-Cr or yeast-Se-Cr had higher(P0.05) DMI than animals supplemented with only yeast. Average daily gain(ADG), gain:feed ratio, chop area, dorsal fat and carcass yield were similar(P0.05) among treatment groups. In conclusion, supplementation with yeast, Se-Cr mixed or yeast-Se-Cr did not improve ADG, final BW, back fat content and carcass yield of growing of Pelibuey×Katahdin lambs. Supplementation with Se-Cr and yeast-Se-Cr increased DMI, and approximately 250 g ADG animal–1 d–1 was produced with no negative effects on growth and health of the animals.  相似文献   

7.
This study was carried out to investigate the growth performance, carcass yield and meat quality of large-type Korean native ducks (KND). A total of 420 day-old ducklings were divided into four treatments (seven replicates/treatment, 15 birds/replicate) by strains (A and B) and gender (male and female) in a 2 × 2 factorial arrangement under complete randomized design. The body weight (BW) of female KND was higher at week 2 and for male it was higher in week 8 (P 〈 0.05). BW gain, feed intake and feed conversion ratio of male KND were higher than those of female KND (P 〈 0.05) during week 0 to week 8. The carcass yield of both strains increased from 6 weeks to 8 weeks (P 〈 0.05). The breast meat ratio was the highest at week 8 whereas the leg meat ratio was the highest at 6 weeks of age in both strains (P 〈 0.01). Lightness (L*), yellowness (b*) and juiciness of meat were the highest at 6 weeks (P 〈 0.05). Moisture, ash and fat contents of meat were the highest at 7 weeks (P 〈 0.05) and protein content was the highest at 8 weeks (P 〈 0.01). These results may provide the basic data on growth performance and meat quality of large-type KND, which can be used for genetic improvements and rearing at commercial scale.  相似文献   

8.
This study was carried out to determine the effect of replacement of forage fiber sources from alfalfa and Leymus chinensis with nonforage fiber sources(NFFS) from dried distillers grains with solubles and corn germ meal on calves growth, rumen development and blood parameters. 48 female and 12 male calves((110.55±15.36) kg of body weight and 12 wk of age) were assigned randomly to four dietary treatments(15 calves/treatment) in a completely randomized design. Experimental diets were: 0% NFFS(control), 9% NFFS(group 1), 18% NFFS(group 2), 27% NFFS(group 3), and contained equivalent neutral detergent fiber and total digestible nutrients, respectively. The dry matter intake was similar among diets, averaging 3.33 kg d-1, and no differences were detected for body weight, withers height, body length and heart girth. In addition, the development of rumen, reticulum, omasum and abomasum also were similar among diets. Dry matter, crude protein, and neutral detergent fiber digestibilities increased with the increasing levels of NFFS in the experimental diets, but had no significant effect. Blood urea nitrogen, total protein and glubulin were not affected by the dietary treatment, but group 3 resulted in the highest(P〈0.05) concentrations of glucose and the lowest(P〈0.05) concentrations of triglycerides and albumin. In conclusion, dried distillers grains with solubles(DDGS) and corn germ meal(CGM) were available and alternative fiber sources for Holstein calf diets.  相似文献   

9.
The present studies were conducted to isolate, select, identify and characterize gut bacteria as antimicrobial and growth promoting agent for the feed of economically important fish Cirrhinus mrigala. Intestinal microflora were isolated, counted, and identified, and their in vitro antibacterial properties were determined. The results have revealed that occurrence of Gram-negative rods was around 75% and of Gram-positive rods was 25%. Among the isolates Gram-positive were maintained in nutrient agar slants at 4°C. Of these, eight strains were replica-plated on agar seeded with Aeromonas hydrophila and only one strain CM2(C. mrigala 2) exhibited antibacterial properties in vitro showing inhibition against fish pathogen by well diffusion assay. This isolated strain was identified as Bacillus cereus. This bacterium was mass cultured and incorporated in the pelleted diet(40% protein and 18 k J g–1 gross energy) of C. mrigala to investigate its effect on growth performance, digestibility, nutrient retention and activities of digestive enzymes. The results of feeding trial revealed significantly(P<0.05) high growth performance in terms of specific growth rate, growth percent gain in body weight(BD)(272.4±1.5)%, high apparent protein digestibility((79.9±0.30)%) and low food conversion ratio in the group of fishes fed on diet containing B. cereus in comparison to the fishes fed on diet without probiotics. The carcass composition also revealed high accumulation of proteins((15.28±0.15) g 100 g–1) in fishes fed on diet containing probiotics. Intestinal enzyme activities of protease, amylase and cellulase were also significantly(P<0.05) high in the group of fishes fed on diet supplemented with probiotics indicating the extracellular enzyme production by B. cereus. These results indicate that probiotics stimulate the digestion through the supply of digestive enzyme and certain essential nutrients to animals. Also significantly(P<0.05) low excretion of metabolites, i.e., ammonia excretion and phosphate production(mg kg–1 BW d–1) was observed in the fishes fed with probiotic based diets. Thus, B. cereus appears to be a promising candidate for ptobiotic applications which can enhance growth performance and nutrient retention in C. mrigala.  相似文献   

10.
Quantitative, qualitative and phenotypic body measurements were determined on Longling Yellow goats in Longling of Yunnan Province in China. Body weight was determined at birth and then at 3, 6, 9, 12, 18, 24, 36, and 48 mon of age. Body measurements traits including height at wither (HW), body length (BL), heart girth (HG), chest depth (CD), and circumference of cannon bone (CCB) were determined at 3, 6, 9, 12, 18, 24, 36, and 48 mon of age. Phenotypic traits including coat colour, horns type, tip horn torsion, nose type, hair on forehead, wattles, ear lobes, black back line, hair on legs, and black hair on belly were determined at 12, 18, 24, 36, and 48 mon of age. Males were heavier (P〈0.01 or P〈0.05) than females; and except for chest depth at 24 mon of age (P 〉 0.05), all other body measurements were also higher (P 〈 0.01 or P 〈 0.05) in males. HW, BL, CD, HG, and BW increased (P 〈 0.01) with age, except for 48 mon of females (P 〉 0.05); while CCB did not always increase with age. HG had the highest correlation (P〈0.01) with body weights of both sexes. No differences were observed between the two sexes in the colour of the coat, horn type, tip horn torsion, nose type, ear lobes, black back line, and black hair on belly. However, differences exist between the two sexes in the presence of hair on forehead, wattles and long hair on legs. The female goats absence of tip horn torsion had positive effect on all variables measured at 36 and 48 mort of age (P〈0.01 or P〈0.05). The presence of wattles was associated with heavier body weights from 18 mort (P〈0.01) of age onward, and also with longer HW, BL and CD (P〈0.01 or P〈0.05) in female goats. Female goats with ear lobes had heavier body weights at 12, 36 and 48 mon (P〈0.01) and longer CCB at 12 and 24 mon of ages (P〈0.05). Hair on legs and black hair on belly only had partly effect body measurements on 12 mon of Longling Yellow female goats. Results of this study provide valuable information that will assist breeders and genetic improvement specialists when conducting selection and preservation programs in Longling Yellow goats in China.  相似文献   

11.
凡纳滨对虾塑料地膜高位池养成的效果   总被引:1,自引:0,他引:1  
江国强 《农技服务》2009,26(7):91-92,107
2年来,用0.54 hm2的试验池,进行了4茬凡纳滨对虾塑料地膜高位池养成试验,通过池塘建设、基础饵料培养、苗种选择放养、饲料投喂、水质管理等措施,试验取得良好的经济效益。第1茬布苗密度105万尾/hm2,经74~76 d饲养,成活率89.2%,饵料系数0.895,商品虾规格76~82尾/kg。第2茬布苗密度150万尾/hm2,经116~122 d饲养,成活率89.3%,饵料系数1.21,商品虾规格50~78尾/kg,4茬养殖共获商品虾35 400 kg,平均每茬单位面积产量16 389 kg/hm2,盈利(未扣除固定资产)510 900元,每茬利润达236 528元/hm2。  相似文献   

12.
阐述了近几年北方南美白对虾在稚虾暂养时出现的传染性疾病,分析了该疾病的发病原因,提出了在暂养过程中以预防为主治疗为辅的方法,以消毒剂、抗生素制剂、抗应激添加剂、微生物制剂相结合的防病治疗方法。指出在南美白对虾苗种的选择上一定要考虑亲本的来源,以及对稚虾要进行病毒检测。  相似文献   

13.
高活性生物修复菌制剂改善虾池水质的研究   总被引:1,自引:0,他引:1       下载免费PDF全文
采用高活性生物修复茵制剂,对养殖中后期的南美白对虾池塘进行了改善水体质量的试验.通过测定分析水体的pH、化学需氧量、氨氮、亚硝酸盐氮、硝酸盐氮、磷酸盐、溶解氧等水质指标,评价水体富营养化状况的变化.结果表明,这种水质净化剂能有效调节pH在7.5~8.5的范围内,提高水体的透明度6.8~13.4 cm,增加水体中溶解氧的含量23.81%~47.37%,降低水体COD和磷酸盐的含量为31.64%~49.71%和30.58%~62.43%,改善养殖水体的富营养化状态,使得试验池水体的营养状况值(E)下降了49.15%~86.96%,为南美白对虾的高产、高效养殖营造了良好的水域生态环境.  相似文献   

14.
对虾在不同的环境条件和养殖模式下具有不同的生长特性,这是进行对虾高效养殖管理的重要依据之一。为探明半集约化土池养殖模式下凡纳滨对虾(Litopenaeus vannamei)的生长特性,2009年5~8月,在广东省电白县的滩涂土池半集约化养殖区,对两个半集约化养殖土池(P1、P2)的凡纳滨对虾的生长参数(全长、体长和体重)进行了养殖全过程的采样测量和数据分析。结果表明:(1)两个土池养殖的凡纳滨对虾的体长(L)与体重(W)均呈显著的幂函数关系,分别为(P1)W=0.016 L2.8935(R2=0.989,P<0.01)、(P2)W=0.0127 L3.0292(R2=0.9911,P<0.01);其生长拐点分别出现在第124 d和128 d;(2)对虾全长(QL)和体长呈明显的线性关系,分别为(P1)QL=0.8319 L+0.2577(R2=0.9997)、(P2)QL=0.8679 L-0.0434(R2=0.9977);(3)体长、体重的von Bertallanffy生长方程分别为(P1)Lt=17.6955(1-e-0.0095(t-12.2421))、Wt=65.2846(1-e-0.0095(t-12.2421))2.8935,(P2)Lt=16.8567(1-e-0.0104(t-21.1781))、Wt=66.0607(1-e-0.0104(t-21.1781))3.0292。  相似文献   

15.
南美白对虾由于其具有繁殖周期长,生长快、适应能力强、个体大且抗病力强,肉味鲜美等优点,是目前水产市场上的畅销产品,前景广阔。近年来其养殖技术发展迅速,产量大幅提高,笔者通过实施南美白对虾淡水高产健康养殖技术,保持了不错的经济效益,该项目组示范养殖面积共13.53hm2,放养虾苗842.5万尾,平均每m2放虾苗63尾;成虾总产量58772.56kg。  相似文献   

16.
通过拌料投喂的方式,研究来源于糟粕醋的融合乳杆菌(LAB041)和植物乳杆菌(LAB1036)分别对凡纳滨对虾生长、非特异性免疫力和抗逆性的影响。结果表明,拌料投喂8周后,LAB041可显著提高实验对虾的存活率、终全长、增重率和特定生长率(P0.05),LAB041和LAB1036可显著降低对虾养殖的饲料系数(P0.05)。LAB041可显著提高实验对虾血清总抗氧化能力(T-AOC)和血清酸性磷酸酶(ACP)活性(P0.05),显著降低对虾的血清超氧化物歧化酶(SOD)活性(P0.05)。虽然LAB1036可提高实验对虾对亚硝酸盐的耐受性和对虾的耐低盐能力,但单因素方差分析显示各组之间死亡率差异不显著(P0.05),而LAB041和LAB1036均可显著降低对虾对高盐度的耐受性(P0.05)。  相似文献   

17.
为了评价纳豆菌抗菌脂肽对凡纳滨对虾(Litopenaeus vannamei)生长和非特异免疫能力的影响,在基础组饲料中分别添加0 mg/kg(A0组,对照组)、50 mg/kg (A1组)、100 mg/kg (A2组)、150 mg/kg(A3组)和200 mg/kg (A4组)NT-6抗菌脂肽,分别投喂平均体重为1.12(±0.10)g的凡纳滨对虾8周,测量和计算对虾的生长和形态指标以及对虾血清和肝胰腺中碱性磷酸酶(AKP)、超氧化物歧化酶(SOD)、溶菌酶(LZM)、总抗氧化能力(T-AOC)及血清中过氧化物酶(POD)活力.结果显示,经过8周的喂养,试验组对虾生长速度均比对照组快,其中A2组对虾的生长速度最快,相对增重率可达58.13%;试验组对虾的各形态指标受抗菌脂肽添加量影响显著,对虾的整体外观商品形态有所改善.试验组对虾肌肉中粗蛋白、脂肪的含量与对照组相比差异显著,粗灰分差异不显著.试验组凡纳滨对虾血清中LZM活性均高于对照组,其中A2组最显著;A1组血清中的POD活性高于其他各组;各组血清中的AKP活性差异不显著;试验组凡纳滨对虾血清中T-AOC和T-SOD活性与对照组相比差异显著且A2组最高.A4组凡纳滨肝胰腺中T-AOC 、LZM、AKP、T-SOD活性明显高于对照组.对虾非特异性免疫指标的提高使对虾的成活率得到了一定的提高,其中A2组的成活率最高.结果表明,在饲料中添加一定量的NT-6抗菌脂肽可显著促进凡纳滨对虾的生长和提高对虾机体的非特异性免疫能力,可作为抗生素饲料添加剂的一种替代物.  相似文献   

18.
在粤西电白县滩涂土池对虾养殖区设置试验组(养殖过程每10d施用芽孢杆菌,用量103CFU/mL)和对照组(不施菌),养殖设施与其他管理相同,全程监测凡纳滨对虾(Litopenaeus vannamei)体长、体质量和主要水质因子的变化,研究芽孢杆菌对养殖对虾数量生长特性及生产效益的影响。结果显示,养殖对虾体长和体质量呈幂函数关系,Von Bertallanffy方程可较好拟合其生长关系,体长增长速度呈对数递减趋势,而体质量则为递增,日龄50d前的体长生长速率高于体质量的;试验组对虾的体长和体质量自日龄56d即超过对照组,收获虾的体长、体质量极显著增大,饲料系数降低了41.41%,产量提高了6.07%。结果表明,养殖过程合理施用芽孢杆菌可改善对虾的生长数量性状,降低饲料系数,提高养殖综合效益。  相似文献   

19.
添加不同构型肉碱对对虾生长和体成分含量的影响   总被引:2,自引:0,他引:2  
研究了在饲料中添加不同构型肉碱对斑节对虾和凡纳对虾生长、饲料利用以及虾体组成成分的影响。在斑节对虾基础饲料(对照组)中分别添加L 肉碱(100、200、300mg/kg),DL 肉碱(100、200、300mg/kg);在凡纳对虾基础饲料(对照组)中添加L 肉碱,添加量分别为50mg/kg、100mg/kg、200mg/kg和300mg/kg。实验用斑节对虾和凡纳对虾体重平均为0.85g,每个处理设3个重复,每个养殖单元放养对虾40尾,实验为期1个月。试验结果表明,在饲料中添加L 肉碱或DL 肉碱,对斑节对虾和凡纳对虾的生长以及饲料利用均无显著影响(P>0.05);在斑节对虾的试验中添加300mg/kg的L 肉碱或DL 肉碱使虾体脂肪含量由4.69%(对照组)降低为3.47%和3.55%(P<0.05)。在凡纳对虾的试验中,添加L 肉碱200mg/kg、300mg/kg组,虾体脂肪含量由7.09%(对照组)降低到6.04%和5.72%(P<0.05)。  相似文献   

20.
研究了在饲料中添加不同构型肉碱对斑节对虾和凡纳对虾生长、饲料利用以及虾体组成成分的影响。在斑节对虾基础饲料(对照组)中分别添加L 肉碱(100、200、300mg/kg),DL 肉碱(100、200、300mg/kg);在凡纳对虾基础饲料(对照组)中添加L 肉碱,添加量分别为50mg/kg、100mg/kg、200mg/kg和300mg/kg。实验用斑节对虾和凡纳对虾体重平均为0.85g,每个处理设3个重复,每个养殖单元放养对虾40尾,实验为期1个月。试验结果表明,在饲料中添加L 肉碱或DL 肉碱,对斑节对虾和凡纳对虾的生长以及饲料利用均无显著影响(P>0.05);在斑节对虾的试验中添加300mg/kg的L 肉碱或DL 肉碱使虾体脂肪含量由4.69%(对照组)降低为3.47%和3.55%(P<0.05)。在凡纳对虾的试验中,添加L 肉碱200mg/kg、300mg/kg组,虾体脂肪含量由7.09%(对照组)降低到6.04%和5.72%(P<0.05)。  相似文献   

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