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首页> 外文期刊>Applied Animal Behaviour Science >Feed resource selection of Criollo goats is the result of an interaction between plant resources, condensed tannins and Haemonchus contortus infection
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Feed resource selection of Criollo goats is the result of an interaction between plant resources, condensed tannins and Haemonchus contortus infection

机译：Criollo Goats的饲料资源选择是植物资源之间相互作用的结果，凝结的单宁和Haemonchus incortus感染

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The tropical deciduous forest (TDF) is an ecosystem with a heterogeneous array of plant species containing different condensed tannin (CT) content. Recent studies explored the effect of polyethylene glycol (PEG) or Haemonchus contortus infection on the intake and feed resource selection of goats. These factors have not been investigated simultaneously. The present study evaluated the role of infection with the abomasal parasitic nematode Haemonchus contortus and the effect of neutralizing CT with PEG on the feed resource selection of Criollo goats in a cafeteria trial. A group of 22 Criollo goats (31.7 +/- 4.8 kg) habituated to browse the TDF, were assigned to four groups: two groups were artificially infected with H. contortus (6000 L-3 per os) and received PEG (50 mg/day) (INF + PEG group) or no PEG (INF group) and the other two groups were kept free of infection with moxidectin (0.4 mg/kg BW sub-cutaneously) and received either PEG (MOX + PEG) or no PEG (MOX). Intake and resource selection of four shrub plant species (Havardia albicans, Gymnopodium floribundum, Leucaena leucocephala and Piscidia piscipula) by goats, and the dynamics of faecal H. contortus egg excretion were determined daily. Intake varied depending on the interaction between plant resource and the infection level (P & 0.001), and between plant resource and whether goats were dosed with PEG (P & 0.001). Excretion of H. contortus eggs was decreased by 69% and 72% for groups with and without PEG administration, respectively. Infected groups had a higher CT intake. The use of PEG reduced intake of L. leucocephala and increased the selection of H. albicans, a high-CT and high crude protein (CP) resource. Animals infected with H. contortus ingested more high CT resources. Furthermore, CP intake was lower in PEG dosed goats, possibly to reduce the energetic cost associated with urinary nitrogen excretion. Selection of feed resources varied depending on parasite infection, PEG dosage and plant resource. We concluded that biological interactions influencing intake and selection of feed resources in goats are complex, rather than arising from a single factor such as parasite infection or secondary compounds such as CT. These findings support that goats' resource selection is a complex process aimed at nutritional optimization.
机译：热带落叶森林（TDF）是一种生态系统，具有异质阵列的植物物种，含有不同的浓缩单宁（CT）含量。最近的研究探讨了聚乙二醇（PEG）或Haemonchus incortus感染对山羊摄入和饲料资源选择的影响。这些因素尚未同时调查。本研究评估了感染对毛皮寄生线虫的作用Haemonchus portortus和中和CT与PEG对自助餐厅试验中Criollo Goats饲料资源选择的影响。习惯于浏览TDF的22名克里罗山羊（31.7 +/- 4.8千克）分配到四组：两组人为被人工感染H. incortus（每对6000 L-3）并接受佩格（50 mg /日）（INF + PEG组）或没有PEG（INF组），另外两组不含杀虫素（0.4mg / kg BW次纤维），并接受PEG（MOX + PEG）或没有PEG（ MOX）。通过山羊的四种灌木植物物种（Havardia Albicans，Geannopodium，Leucaena Leucocephala和Piscidia Piscula和Piscidia Piscula）的摄入和资源选择。摄入量根据植物资源和感染水平（P＆amp; 0.001）之间的相互作用而变化，并且在植物资源之间以及山羊是否用PEG提出（P＆amp; 0.001）。对于具有和不具有PEG施用的组，H. incortus卵的排泄分别下降69％和72％。受感染的群体具有更高的CT摄入量。 PEG的使用减少了L. Leucocephala的摄入量，并增加了H. albicans，高CT和高粗蛋白（CP）资源的选择。感染H.污染的动物摄取了更高的CT资源。此外，PEG给药的CP摄入量较低，可能降低与尿氮排泄相关的能量成本。饲料资源的选择根据寄生虫感染，PEG剂量和植物资源而变化。我们得出结论，影响摄入和山羊饲料资源选择的生物相互作用是复杂的，而不是由寄生虫感染或中等化合物如CT等因素而产生的复杂性。这些调查结果支持山羊的资源选择是旨在营养优化的复杂过程。

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