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首页> 外文期刊>Research Opinions in Animal & Veterinary Sciences >Growth performance and nitrogen retention in lambs fed diets containing two different levels of crude protein supplemented with pistachio by-product extract as a source of tannins
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Growth performance and nitrogen retention in lambs fed diets containing two different levels of crude protein supplemented with pistachio by-product extract as a source of tannins

机译：含有两种不同水平的粗蛋白和开心果副产物提取物作为单宁来源的羔羊饲喂日粮的生长性能和氮保留

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The effects of pistachio by-products aqua extract (PBE) on growth performance and retention of dietary nitrogen (N) were investigated in finishing lambs fed diets containing 11.3% DM (low protein; LP) or 13.9% DM (high protein; HP) crude protein. Two groups (n = 10) of Baluchi ram lambs (4-5 months old, 26.25±3.30 kg initial BW) were allotted to LP and HP treatments. In each group, one half of the lambs received experimental diets mixed with 500 ml liquid fresh PBE per kg DM of diet. Thus, four experimental diets were tested: LP diet without PBE supplementation; LP-PEB, LP diet with PBE supplementation; LP+PBE, HP diet without PBE supplementation; HP-PBE and HP diet with PBE supplementation; HP+PBE. Feed intake, average daily gain (ADG) and feed conversion ratio (FCR) were recorded for a 50 d experimental period. Plasma urea (PUN) and ruminal NH 3 -N concentrations were measured at 0, 2 and 4 h after morning feeding on the 35 th d of the experiment. Apparent total tract digestibility of DM, organic matter (OM) and N as well as urinary losses and retention of N were also determined for 5 days at the end of the experiment. Although there was a tendency for feed intake to be lower (P=0.102) in LP compared with HP fed lambs, the dietary CP level had no effect on ADG and FCR. In contrast, PBE supplementation improved both growth rate (P=0.021) and FCR (P=0.104) of lambs. The urinary losses of N and also PUN and ruminal NH 3 -N concentrations at h 2 and 4 after feeding were decreased and the retention of N was increased by PBE supplementation of diets. However, these effects of PBE were only significant in the lambs fed HP diet. The concentrations of PUN (0 and 4 h after feeding) and ruminal NH 3 -N (4 h after feeding) were affected positively by dietary CP level. Although the lambs feeding on the LP diet retained a higher percentage of N intake or N digested, no difference in daily N retained was observed between LP and HP fed lambs. The experimental treatments had no effect on DM, OM and N apparent digestibility. Our results indicated that the low concentration of PBE tannins have a protein-sparing potential depend on dietary CP density, thereby improving growth performance and N retention in finishing lambs.
机译：阿月浑子副产物水提取物（PBE）对羔羊饲喂含11.3％DM（低蛋白; LP）或13.9％DM（高蛋白; HP）的日粮的生长性能和膳食氮（N）保留的影响进行了研究。粗蛋白质。两组（n = 10）Bal路支公羊羔（4-5个月大，初始体重为26.25±3.30 kg）被分配给LP和HP处理。在每组中，一半的羔羊接受实验饮食，每千克DM饮食中混合500毫升液态新鲜PBE。因此，测试了四种实验饮食：不添加PBE的LP饮食; LP-PEB，补充PBE的LP饮食; LP + PBE，不添加PBE的HP饮食; HP-PBE和HP饮食加上PBE补充剂; HP + PBE。记录了50天实验期间的采食量，平均日增重（ADG）和饲料转化率（FCR）。在实验第35天的早晨喂食后0、2和4小时测量血浆尿素（PUN）和瘤胃NH 3 -N浓度。在实验结束后的5天中，还确定了DM，有机物（OM）和N的表观总道消化率，以及尿液的损失和N的保留。尽管与高压饲喂的羔羊相比，低压饲喂的饲料有降低的趋势（P = 0.102），但日粮的CP水平对ADG和FCR没有影响。相反，补充PBE可以提高羔羊的生长速度（P = 0.021）和FCR（P = 0.104）。饲喂PBE可以减少尿液中N的尿流失以及PUN和瘤胃中NH 3 -N的浓度，并在饲喂后2 h和4时减少。但是，PBE的这些作用仅在喂食HP饲料的羔羊中显着。饲料中CP水平对PUN（进食后0和4小时）和瘤胃NH 3 -N（进食后4小时）的浓度有积极影响。尽管以低脂饮食饲喂的羔羊的氮摄入量或氮消化率较高，但低脂饲喂的羔羊和高脂饲喂的羔羊的每日氮保留量没有差异。实验处理对DM，OM和N表观消化率没有影响。我们的研究结果表明，低浓度的PBE丹宁具有节省蛋白质的潜力，这取决于饮食中CP的密度，从而改善了羔羊羔羊的生长性能和氮保留。

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