本研究应用多性状动物模型DFREML方法估计了湖北白猪优质系生长和胴体性状的遗传参数。生长性状：平均日增重（ADG）、90 kg体重日龄（DAYS）、达90 kg体重背膘厚（BF）和饲料转化率（FCR）的遗传力估计值分别为0.42、0.34、0.22和0.48。各性状均存在一定的窝效应，变化范围为0.09～0.31。胴体性状：宰前活重、胴体重、屠宰率、瘦肉率、眼肌面积、肋膘厚、腿臀比、胴体直长、肋皮厚和肌内脂肪含量的遗传力分别为0.13、0.21、0.32、0.45、0.67、0.52、0.48、0.65、0.72和0.32。生长性状ADG/DAYS、ADG/BF、ADG/FCR、DAYS/BF、DAYS/FCR、BF/FCR的遗传相关分别为-0.72、0.25、-0.48、-0.17、0.55和-0.04。胴体性状眼肌面积、腿臀比与瘦肉率的遗传相关分别为0.62、0.59，肌内脂肪含量与瘦肉率、眼肌面积和腿臀比的遗传相关分别为-0.28、-0.15和-0.23。

In this study, the genetic parameters of main growth and carcass line in Hubei white swine high quality strain were analyzed by applying the method of Multi-trait animal model DFREML. The results showed that the heritabilidy evaluations of average daily gain(ADG), age at 90 kg body weight(AGE), back-fat(BF) up to 90 kg body weight and feed conversion ratio(FCR) were 0.42, 0.34, 0.22 and 0.48 respectively. Each traits presented certain litter effects and the ef-fects ranged from 0.09 to 0.31. The heritabilidy evaluations of live weight before slaughter, car-cass weight, dressing percentage, lean meat percentage, eye muscle area, back-fat between 6th and 7th lib, hind leg percentage, carcass straight length, skin thickness and eye muscle area were 0.13, 0.21, 0.32, 0.45, 0.67, 0.52, 0.48, 0.65, 0.72 and 0.32 respectively. The genetic correla-tion of ADG/DAYS, ADG/BF, ADG/FCR, DAYS/BF, DAYS/FCR and BF/FCR were -0.72, 0.25, -0.48, -0.17, 0.55 and -0.04, respectively. The genetic

本试验旨在研究黄曲霉毒素与吸附剂对肉鸭生长性能和免疫指标的影响，以评价蒙脱石与酵母细胞壁吸附剂的作用效果。选用1日龄樱桃谷肉公鸭360只，随机分为4组，每组6个重复，每个重复15只。负对照组饲喂基础饲粮，正对照组饲粮用黄曲霉毒素含量为1337.21μg/kg的霉变棉籽粕替代正常棉籽粕，试验组分别在正对照组饲粮中添加2.0 g/kg的蒙脱石吸附剂或酵母细胞壁吸附剂，棉籽粕添加比例均为8%。试验期35 d。结果表明：1)与负对照组相比，黄曲霉毒素显著降低了肉鸭平均日增重( ADG)、平均日采食量( ADFI)、35日龄胸肌率和瘦肉率、14和35日龄血清蛋白和免疫球蛋白G( IgG)、免疫球蛋白 M( IgM)含量( P<0.05)，显著提高了35日龄料重比和免疫器官指数( P<0.05)。2)与正对照组相比，蒙脱石组和酵母细胞壁组显著提高了ADG、ADFI及血清蛋白和IgG、IgM含量( P<0.05)，显著降低了免疫器官指数( P<0.05)。3)与酵母细胞壁组相比，蒙脱石组显著提高了ADG及血清蛋白和IgG、IgM含量( P<0.05)，显著降低了免疫器官指数( P<0.05)。由此可见，黄曲霉毒素降低了肉鸭的生长性能和免疫功能，饲粮添加吸附剂能缓解黄曲霉毒素的不良影响，蒙脱石吸附剂作用效果更佳。

This experiment was conducted to investigate the effects of aflatoxins and absorbents on growth per-formance and immune indices of meat ducks, and to evaluate the efficacy of montmorillonite ( PCM) and yeast cell wall ( PCY) . A total of 360 one-day-old Cherry Valley male ducks were randomly divided into 4 groups with 6 replicates per group and 15 ducks per replicate. The four diets formulated included a basal diet ( negative control group) , a contaminated diet ( positive control group) and two contaminated diets supplemented with 2 g/kg PCM or PCY. Of those, the contaminated diet was formulated by replacing common cottonseed meal with 8% naturally moldy one ( aflatoxins content 1 337.21μg/kg) on the equal nutrient level basis. The exper-iment lasted for 35 days. The results showed as follows:1) compared with the negative control group, aflatox-ins significantly decreased average daily gain ( ADG) , average daily feed intake ( ADFI) , percentage of breast muscle and percent

为研究日粮中添加芦荟多糖对断奶仔猪生长性能和血清生化指标的影响,选取72头体重(7.29±0.52)kg杜×长×大断奶仔猪,按体重分为3个处理,每个处理4个重复,每个重复6头猪。对照组饲喂基础日粮(NC),试验1组猪为基础日粮+0.1%芦荟多糖(AVP1),试验2组为基础日粮+250 mg/kg 4%黄霉素(PC)。结果表明:与对照组相比,添加0.1%芦荟多糖可显著提高断奶仔猪平均日增重(ADG)(P0.01),显著降低料重比(F/G)(P0.05);并能显著提高仔猪血清中总蛋白、白蛋白浓度和碱性磷酸酶活性(P0.05),降低尿素氮水平(P0.05)。结果说明,芦荟多糖可以改善断奶仔猪的生长性能,并且作用效果与黄霉素相近。

The experiment was conducted to study the effects of Aloe vera polysaccharide (AVP)on growth perfor-mance,serum biochemical indexes in weaned piglets.Seventy-two weaned piglets of (7.29 ± 0.52)kg body weight were randomly divided into three groups with four replicates of six each.The three groups were basal diet group (NC),basal di-et+0.1% AVP (AVP1),basal diet+250 mg/kg flavomycin (PC),respectively.The results showed as follows:Compared with control group,average daily gain (ADG)of AVP1 significantly increased (P < 0.01),the feed/gain of AVP1 significantly decreased (P < 0.05);the content of total protein and albumin and the activity of alkaline phosphatase (AKP) of AVP1 group significantly increased(P < 0.05),and the content of serum urea nitroge(SUN)significantly decreased(P < 0.05). The results indicated that AVP could improve growth performance of weaned piglets,and its effects was similar to flavomycin.

为研究酵母水解物部分或全部替代血浆蛋白粉对仔猪生长性能的影响。本试验选取30头(28±2)日龄、体重相近的"杜×长×大"断奶仔猪,随机分为3组(血浆蛋白组、半替代组、全替代组),每组2个重复,每个重复5头猪。血浆蛋白组饲喂含4%进口血浆蛋白粉日粮,半替代组饲喂含2%酵母水解物+2%血浆蛋白粉日粮,全替代组饲喂含4%酵母水解物日粮。试验期22 d,所有仔猪自由采食和饮水。结果表明,半替代组与血浆蛋白组相比,断奶仔猪平均日增重(ADG)有提高的趋势,且降低料肉比(F/G);全替代组与血浆蛋白组相比,断奶仔猪的生长性能与血浆蛋白组基本一致。因此,酵母水解物替代血浆蛋白粉对仔猪生长性能无不良影响。

The study was to investigate the effect of autolyzed yeast,as partial or total substitution of spray dried plasma protein,on growth performance of weaned piglets.Thirty weaned piglets(Duroc×Landrace×Large white)with (28±2) days old were randomly divided into 3 groups with 2 replicates of 5 each.The dietary treatments included diet containing 4% spray dried plasma profein (SDPP Group),diet containing 2% spray dried plasma profein and 2% autolyzed yeast (Half-Replace Group),diet containing 4% autolyzed yeast (Total- Replace Group).All pigs had free access to diet and water.The results showed that feeding diet containing 2% spray dried plasma profein and 2% autolyzed yeast had a trend of increase of average daily gain(ADG),and decreased feed to gain ration(F/G) compared to pigs in SDPP Group.Mean-while,The total replacement of with autolyzed yeast did not affect the growth performance of piglets.Consequently,au-tolyzed yeast instead of plasma protein had no bad effect on pigl

本试验旨在通过探讨一定消化能(DE)水平下饲粮色氨酸(Trp)水平对生长肉兔生产性能及血清生化指标的影响,得到生长肉兔饲粮中Trp的适宜水平。选择平均体重为(1 099.14±54.01)g的健康新西兰生长肉兔112只,随机分为8组(每组7个重复,每个重复2只兔),分别饲喂Trp水平为0.165%、0.175%、0.185%、0.195%、0.205%、0.215%、0.225%和0.235%的试验饲粮。预试期7 d,正试期28 d。结果表明:1)饲粮Trp水平对生长肉兔平均日采食量(ADFI)和料重比(F/G)有显著影响(P0.05),对平均日增重(ADG)有极显著影响(P0.01),以饲粮Trp水平为0.205%的组ADFI和ADG最高,F/G最低。2)饲粮Trp水平对生长肉兔血清尿素氮(UN)和类胰岛素样生长因子-Ⅰ(IGF-Ⅰ)含量有极显著影响(P0.01),以饲粮Trp水平为0.205%的组血清UN含量最低,血清IGF-Ⅰ含量最高。饲粮Trp水平对生长肉兔血清总蛋白(TP)和白蛋白(ALB)含量无显著影响(P0.05)。综合本试验测定指标,当饲粮DE水平为10.48 MJ/kg时,生长肉兔饲粮中Trp的适宜水平为0.205%(实测值为0.196%)。

This experiment was conducted to study the effects of dietary tryptophan level on performance and serum biochemical indices of growing meat rabbits in a certain level of digestible energy,in order to determine the appropriate level of dietary tryptophan. A total of 112 healthy New Zealand growing meat rabbits with an average body weight of(1 099.14±54.01)g were randomly assigned to 8 groups with 7 replicates per group and 2 rabbits per replicate. Rabbits in the 8 groups were fed experimental diets containing 0.165%,0.175%, 0.185%,0.195%,0.205%,0.215%,0.225% and 0.235% tryptophan,respectively. The experiment lasted for 7 days for adaptation and 28 days for test. The results showed as follows:1)dietary tryptophan level had significant influences on average daily feed intake( ADFI)and feed/gain( F/G)( P 0.05). Considering all indices of this experiment,when digestible energy level is 10. 48 MJ/kg in the diet,the appropriate level of dietary tryptophan of growing meat rabbits is