Institute of Rural Sciences, University of Wales, Llanbadarn Campus, Aberystwyth SY23 3AL, UK.
Animal. 2007 Mar;1(2):227-32. doi: 10.1017/S1751731107340032.
This work was conducted to evaluate the effect of tannins, contained in a by-product derived from olive oil extraction (two-stage olive cake), on nutrient digestibility, nitrogen (N) losses and liver and kidney functions in goats and wethers. Six Segureña wethers and six Granadina goats were fed three experimental diets: alfalfa hay (AH); alfalfa hay and a concentrate (formulated with two-stage olive cake, barley and a mineral-vitamin mixture) without (AHCO) or with polyethylene glycol (PEG) addition (AHCOP). The inclusion of two-stage olive cake increased condensed tannins content of the diet and led to a decrease ( P < 0.001) in dry matter, organic matter, neutral-detergent fibre, acid-detergent fibre and crude protein (CP) digestibility. PEG supply increased ( P < 0.001) CP digestibility and N losses in urine and faeces only in wethers. Concentrations of creatinine and alkaline phosphatase activity, measured in the serum of animals, were not modified either by olive cake inclusion or by PEG supply. Results from this work indicate a higher sensitivity of sheep to diets containing condensed tannins, compared with goats, and reveal no toxic effect of tannins from two-stage olive cake at the concentration used in the experimental diets.
本研究旨在评估橄榄油提取副产物（两阶段橄榄饼）中所含单宁对山羊和绵羊养分消化率、氮（N）损失以及肝脏和肾脏功能的影响。选用 6 只 Segureña 绵羊和 6 只 Granadina 山羊进行了三项实验性日粮喂养：苜蓿干草（AH）；含两阶段橄榄饼、大麦和矿物质-维生素混合物的苜蓿干草和浓缩饲料（ACHO）；含两阶段橄榄饼、大麦和矿物质-维生素混合物的苜蓿干草和浓缩饲料，添加了聚乙二醇（PEG）（AHCOP）。两阶段橄榄饼的添加增加了日粮中缩合单宁的含量，导致干物质、有机物、中性洗涤剂纤维、酸性洗涤剂纤维和粗蛋白（CP）消化率降低（P<0.001）。PEG 的供应仅增加了绵羊的 CP 消化率和尿液及粪便中的 N 损失（P<0.001）。动物血清中肌酸酐和碱性磷酸酶活性的浓度既不受橄榄饼的添加影响，也不受 PEG 供应的影响。本研究结果表明，与山羊相比，绵羊对含缩合单宁的日粮更为敏感，且在实验日粮中使用的浓度下，两阶段橄榄饼中的单宁没有毒性作用。
