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首页> 美国卫生研究院文献>Journal of Animal Science >Tannin-containing legumes and forage diversity influence foraging behavior diet digestibility and nitrogen excretion by lambs
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Tannin-containing legumes and forage diversity influence foraging behavior diet digestibility and nitrogen excretion by lambs

机译：含丹宁的豆类和饲料多样性影响羊羔的锻造行为饮食消化率和氮排泄物

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Diverse combinations of forages with different nutrient profiles and plant secondary compounds may improve intake and nutrient utilization by ruminants. We tested the influence of diverse dietary combinations of tannin- (sainfoin-Onobrichis viciifolia; birdsfoot trefoil-Lotus corniculatus) and non-tannin- (alfalfa-Medicago sativa L.) containing legumes on intake and diet digestibility in lambs. Freshly cut birdsfoot trefoil, alfalfa, and sainfoin were offered in ad libitum amounts to 42 lambs in individual pens assigned to 7 treatments (6 animals/treatment): 1) single forage species (sainfoin [SF], birdsfoot trefoil [BFT], and alfalfa [ALF]), 2) all possible 2-way choices of the 3 forage species (alfalfa-sainfoin [ALF-SF], alfalfa-birdsfoot trefoil [ALF-BFT], and sainfoin-birdsfoot trefoil [SF-BFT]), or 3) a choice of all 3 forages (alfalfa-sainfoin-birdsfoot trefoil [ALF-SF-BFT]). Dry matter intake (DMI) was greater in ALF than in BFT (P = 0.002), and DMI in SF tended to be greater than in BFT (P = 0.053). However, when alfalfa was offered in a choice with either of the tannin-containing legumes (ALF-SF; ALF-BFT), DMI did not differ from ALF, whereas DMI in SF-BFT did not differ from SF (P > 0.10). When lambs were allowed to choose between 2 or 3 legume species, DMI was greater (36.6 vs. 33.2 g/kg BW; P = 0.038) or tended to be greater (37.4 vs. 33.2 g/kg BW; P = 0.067) than when lambs were fed single species, respectively. Intake did not differ between 2- or 3-way choice treatments (P = 0.723). Lambs preferred alfalfa over the tannin-containing legumes in a 70:30 ratio for 2-way choices, and alfalfa > sainfoin > birdsfoot trefoil in a 53:33:14 ratio for the 3-way choice. In vivo digestibility (DMD) was SF > BFT (72.0% vs. 67.7%; P = 0.012) and DMD in BFT tended to be greater than in ALF (64.6%; P = 0.061). Nevertheless, when alfalfa was offered in a choice with either sainfoin or birdsfoot trefoil (ALF-SF; ALF-BFT), DMD was greater than ALF (P < 0.001 and P = 0.007, respectively), suggesting positive associative effects. The SF treatment had lower blood urea nitrogen and greater fecal N/N intake ratios than the ALF, BFT, or ALF-BFT treatments (P < 0.05), implying a shift in the site of N excretion from urine to feces. In conclusion, offering diverse combinations of legumes to sheep enhanced intake and diet digestibility relative to feeding single species, while allowing for the incorporation of beneficial bioactive compounds like condensed tannins into the diet.
机译：具有不同营养素型材和植物中学化合物的不同饲料组合可以通过反刍动物改善摄入量和营养利用。我们测试了单宁 - （Sainfoin-Onobrichis viciifolia的不同膳食组合的影响;含有豆类的含有豆类的植物含有豆类的非单宁 - （Alfalfa-Medicago Sativa L.）。在AD Libitum中提供新鲜切割的鸟类小吃，苜蓿和Sainfoin在分配给7种治疗的单个钢笔（6只动物/治疗）：1）单件饲料物种（Sainfoin [Sf]，鸟类脚三叶草[BFT]，以及2）2）3种饲料物种的所有2路选择（Alfalfa-sainFoin [Alf-Sf]，Alfalfa-Bircorfoot Trafoil [Alf-BFT]和Sainfoin-BirdoOoot Trefoil [SF-BFT]）或3）所有3个饲料的选择（Alfalfa-sainfoin-birdoot trefoot [Alf-SF-BFT]）。在ALF中的干物质进气（DMI）比在BFT中更大（P = 0.002），并且SF中的DMI倾向于大于BFT（P = 0.053）。但是，当苜蓿中的任何一种含有单宁豆类（Alf-Sf; Alf-BFT）提供时，DMI没有与ALF不同，而SF-BFT中的DMI与SF不同（P> 0.10）没有差异。当允许羊羔选择2或3种豆类物种时，DMI更大（36.6 vs.3.2g / kg bw; p = 0.038）或倾向于更大（37.4与33.2g / kg bw; p = 0.067）当羔羊被喂食单一物种时。 2-或3路选择处理之间的摄入没有差异（P = 0.723）。羔羊优选含有单宁豆类的苜蓿，以70:30的比例为双向选择，Alfalfa> Sainfoin> Birdsfoot Trefoot以53:33:14的比例为3路选择。体内消化率（DMD）是SF> BFT（72.0％与67.7％; P = 0.012），DMD在BFT中倾向于大于ALF（64.6％; P = 0.061）。尽管如此，当苜蓿或鸟类食物三氟刀（Alf-Sf; Alf-BFT）提供苜蓿时，DMD大于ALF（分别为P <0.001和P = 0.007），表明阳性联想效果。 SF处理具有低于ALF，BFT或ALF-BFT治疗的血尿尿素氮和更大的粪便N / N进气量（P <0.05），暗示从尿液到粪便的N排泄场的偏移。总之，提供相对于饲养单一物种的植物增强的摄入和饮食消化率的不同组合，同时允许将有益的生物活性化合物掺入浓缩的单宁以饮食中的浓缩生物活性化合物。

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