当前位置: 首页>技术中心>技术前沿

日粮铁水平对生长肥育猪生长性能、血液状况和肠道功能的影响

发布单位:1号站彩票app下载

查看次数:405

时间2020-04-12
本研究研究了不同铁添加水平对生长肥育猪生长性能、血液状况、肠道屏障功能和肠道消化的影响。

试验共选用1200头试验猪只,平均初重(BW,27.74 ± 0.28 kg),随机分为40个栏,每栏30头猪(母猪和公猪各占1/2),按体重和性别进行分配,分别饲喂5种试验饲粮(每个饲粮8个重复栏)。试验饲粮为对照饲粮(不添加FeSO4的基础饲粮),在基础饲粮中分别添加150、300、450和600 mg/kg Fe作为FeSO4饲粮。试验期为100 d,前50 d为生长阶段(体重27 ~ 60 kg),后50 d为育肥阶段(体重61 ~ 100 kg)。基础饲粮采用不含铁的微量矿物质预混料,生长阶段饲粮总铁含量为203.36 mg/kg,育成阶段饲粮总铁含量为216.71 mg/kg,均为原料成分提供。试验结束时,从每个处理(每栏1头猪)中随机选取8头猪(4头公猪和4头母猪)采集食糜、血液和肠道样品。

试验数据表明,在育肥阶段,含Fe日粮组猪只的平均日采食量(P = 0.025)、平均日增重(P = 0.020)和体重(P = 0.019)呈线性增加。另一方面,饲粮中添加不同铁水平显著提高了血清铁和转铁蛋白饱和度(P < 0.05)、十二指肠绒毛杯状细胞数量(P < 0.001)和MUC4 mRNA表达量(P < 0.05)。含450和600 mg/kg铁水平日粮组猪只氨基酸(AA)的表观回肠消化率(AID)高于对照组(P < 0.05)。

综上所述,饲粮中添加450 ~ 600 mg/kg铁可通过改变猪血液状况、促进肠道杯状细胞分化和提高AA的AID等改善猪的生长性能。

Effects of dietary iron level on growth performance, hematological status, and intestinal function in growing-finishing pigs
This study investigated the different addition levels of iron (Fe) in growing-finishing pigs and the effect of different Fe levels on growth performance, hematological status, intestinal barrier function, and intestinal digestion. A total of 1,200 barrows and gilts ([Large White × Landrace] × Duroc) with average initial body weight (BW; 27.74 ± 0.28 kg) were housed in 40 pens of 30 pigs per pen (gilts and barrows in half), blocked by BW and gender, and fed five experimental diets (eight replicate pens per diet). The five experimental diets were control diet (basal diet with no FeSO4 supplementation), and the basal diet being supplemented with 150, 300, 450, or 600 mg/kg Fe as FeSO4 diets. The trial lasted for 100 d and was divided into the growing phase (27 to 60 kg of BW) for the first 50 d and the finishing phase (61 to 100 kg of BW) for the last 50 d. The basal diet was formulated with an Fe-free trace mineral premix and contained 203.36 mg/kg total dietary Fe in the growing phase and 216.71 mg/kg in the finishing phase based on ingredient contributions. And at the end of the experiment, eight pigs (four barrows and four gilts) were randomly selected from each treatment (selected one pig per pen) for digesta, blood, and intestinal samples collection. The results showed that the average daily feed intake (P = 0.025), average daily gain (P = 0.020), and BW (P = 0.019) increased linearly in the finishing phase of pigs fed with the diets containing Fe. On the other hand, supplementation with different Fe levels in the diet significantly increased serum iron and transferrin saturation concentrations (P < 0.05), goblet cell numbers of duodenal villous (P < 0.001), and MUC4 mRNA expression (P < 0.05). The apparent ileal digestibility (AID) of amino acids (AA) for pigs in the 450 and 600 mg/kg Fe groups was greater (P < 0.05) than for pigs in the control group. In conclusion, dietary supplementation with 450 to 600 mg/kg Fe improved the growth performance of pigs by changing hematological status and by enhancing intestinal goblet cell differentiation and AID of AA.

文章来源:猪营养国际论坛
【免责声明】:文章来源于网络,我们对文中陈述观点判断保持中立,并不对文章观点负责。仅供读者参考。版权属于原作者。