本试验旨在研究饲粮铁添加水平对60~90日龄新西兰肉兔生长性能、屠宰性能及血液指标的影响.试验选取104只53日龄体重相近新西兰肉兔,随机分成4个组,每组26个重复,每个重复1只兔.对照组饲喂基础饲粮,试验组分别在基础饲粮中添加50、100、200 mg/kg铁,铁添加形式为七水硫酸亚铁(FeSO4·7H2O),纯度为98%.预试期7 d,正试期30 d.结果表明:1)饲粮铁添加水平对60~90日龄新西兰肉兔平均日增重(ADG)和料重比(F/G)有影响显著(P<0.05),对平均日采食量(ADFI)无显著影响(P>0.05).随着饲粮铁添加水平的增加,ADG先增加后降低,F/G先降低后增加;当饲粮铁添加水平为100 mg/kg时,ADG最高,F/G最低.2)饲粮铁添加水平对60~90日龄新西兰肉兔全净膛屠宰率和半净膛屠宰率有显著影响(P<0.05),随着饲粮铁添加水平的增加,全净膛屠宰率和半净膛屠宰率先增加后降低,当饲粮铁添加水平为50 mg/kg时最高.3)饲粮铁添加水平对60~90日龄新西兰肉兔肝脏指数无显著影响(P>0.05),对肾脏指数和脾脏指数有显著影响(P<0.05).饲粮铁添加水平为50、100、200 mg/kg时,肾脏指数显著高于对照组(P<0.05);饲粮铁添加水平为100、200 mg/kg时,脾脏指数显著高于对照组(P<0.05).4)饲粮铁添加水平对60~90日龄新西兰肉兔血液中铁、铜、钙、锌、镁含量无显著影响(P>0.05);饲粮铁添加水平对血小板分布宽度(PDW)、平均血小板体积(MPV)、血小板大细胞比率(P-LCR)有显著影响(P<0.05).综合本试验测定指标,60~90日龄新西兰肉兔饲粮中适宜的铁添加水平为50~100 mg/kg.%This experiment was conducted to investigate the effects of dietary iron supplemental level on growth performance, slaughter performance and blood indexes of 60 to 90-day-old New Zealand meat rabbits.One hundred and four 53-day-old New Zealand meat rabbits with similar body weight were randomly divided into four groups with twenty six replicates per group and each replicate contained one rabbit.The rabbits in control group were fed a basic diet, and those in experimental groups were fed experimental diets with 50, 100 and 200 mg/kg iron (the supplemental form was FeSO4·7H2O, and purity was 98%), respectively.The trial lasted for 7 days for adaption, and 30 days for test.The results showed as follows: 1) dietary iron supplemental level had significant effect on the average daily gain (ADG) and the feed to gain ratio (F/G) (P<0.05), but had no significant effect on the average daily feed intake (ADFI) of 60 to 90-day-old New Zealand meat rabbits (P>0.05).With the dietary iron supplemental level increased, the ADG was firstly increased and then decreased, the F/G was firstly decreased and then increased;the highest ADG and the lowest F/G when dietary iron supplemental level was 100 mg/kg.2) Dietary iron supplemental level had significant effect on half eviscerated ratio and all eviscerated ratio of 60 to 90-day-old New Zealand meat rabbit (P<0.05), with the dietary iron supplemental level increased, the half eviscerated ratio and all eviscerated ratio was firstly increased and then decreased, and got the highest when dietary iron supplemental level was 50 mg/kg.3) Dietary iron supplemental level had no significant effect on liver ratio (P>0.05), but had significant effect on spleen ratio and kidney ratio of 60 to 90-day-old New Zealand meat rabbits (P<0.05).When dietary iron supplemental level was 50, 100 and 200 mg/kg, the kidney ratio was significantly higher than that in control group (P<0.05);when dietary iron supplemental level was 100 and 200 mg/kg, the spleen ratio was significantly higher than that in control group (P<0.05).4) Dietary iron supplemental level had no significant effect on the contents of iron, copper, calcium, zinc and magnesium in blood of 60 to 90-day-old New Zealand meat rabbit (P>0.05).Dietary iron supplemental level had significant effect on platelet distribution width (PDW), mean platelet volume (MPV) and platelet-large cell rate (P-LCR) (P<0.05).Considering all indexes of this experiment, the appropriate dietary iron supplemental level is 50 to 100 mg/kg for 60 to 90-day-old Zealand meat rabbit.
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