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首页> 外文期刊>Livestock Science >The use of w-alkanes to estimate diet composition of ruminants grazing on species diverse plant communities - Effect of feeding selectivity on diet composition estimates
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The use of w-alkanes to estimate diet composition of ruminants grazing on species diverse plant communities - Effect of feeding selectivity on diet composition estimates

机译：使用正构烷烃估算放牧对物种多样化植物群落的反刍动物的饮食组成-进食选择性对饮食组成估计的影响

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摘要

The present study aimed to evaluate the effect of feeding selectivity (FS) within a dietary group comprising plant species with similar alkane profile, on the estimates of diet composition of goats, sheep and cows grazing on vegetation composed of gorse-heathland with areas of improved pastures. Plant species collected in the field study were grouped in four dietary groups according to cluster analysis: Dl (Lolium perenne, Pseudarrhenatherum longifolium and Agrostis capillaris), D2 (Calluna vulgaris,Erica cinerea, Erica umbellata, Erica austmlis), while Erica arborea (D3) and Ulex gallii (D4) remained as individual components due to their distinct bate-alkane profiles. The application of different levels of feeding selectivity (0, 5, 15, 30, 60, 90and 100%) to the graminaceous species included in Dl group affected significantly (P<0.05) the diet composition estimates as a result of the modification of the alkane pattern of the dietary group used in the calculations. However, this effect was not so evident within all ranges of FS and when evaluated in the heather species of D2 group. When L. perenne and C. vulgaris were removed from Dl and D2 dietary groups and treated as individual components, there was a decrease in the FS effect on the diet composition estimates. The results obtained show that dietary groups formed by multivariate statistical analysis should be used carefully as they could be sensitive to feeding selectivity, with consequently large effects on the estimates of diet composition. This effect will depend on the similarity in the alkane profile of the plant species that composed the dietary group.
机译：本研究旨在评估在具有类似烷烃特性的植物组成的饮食组中，进食选择性（FS）对放牧在由金雀石荒地组成的植被改善的山羊，绵羊和牛的饮食组成上的影响的评估牧场。根据聚类分析，在田间研究中收集到的植物物种分为四个饮食组：D1（黑麦草，长叶假单胞菌和毛孢农杆菌），D2（寻常的愈伤组织，Erica cinerea，Erica umbellata，Erica austmlis）和Erica arborea（D3） ）和Ulex gallii（D4）由于其不同的贝特烷构型而保留为单独的组分。对Dl组所包括的禾本科物种应用不同水平的进食选择性（0、5、15、30、60、90和100％）显着（P <0.05）改变了日粮组成估计值计算中使用的饮食组的烷烃模式。但是，在FS的所有范围内以及在D2组的希瑟物种中进行评估时，这种效果并非如此明显。当从D1和D2饮食组中除去L. perenne和C. vulgaris时，FS对饮食组成估计的影响降低。获得的结果表明，应谨慎使用通过多元统计分析形成的饮食组，因为它们可能对饲料的选择性敏感，因此对饮食组成的估计值影响很大。这种影响将取决于组成饮食组的植物物种烷烃谱的相似性。

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