نتایج جستجو برای: pecking order hypothesis
تعداد نتایج: 1106713 فیلتر نتایج به سال:
BACKGROUND Feather pecking and cannibalism are major concerns in poultry farming, both in terms of animal welfare and farm economics. Genetic selection and introduction of (aspects of) maternal care have been suggested as potential interventions to reduce feather pecking in laying hens. Altered brain development has been proposed to reflect welfare states in animals, and can provide more insigh...
Environmental enrichment is thought likely to benefit chickens and farmers in many ways; these include reduced fearfulness and feather pecking and improved productivity. Enrichment devices would intuitively be more effective if they reliably attracted and sustained appreciable interest but many fail to do so. This may reflect the fact that the choice of stimuli often reflects availability and h...
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The hypothesis of formative causation predicts that as animals of a given species learn a new pattern of behaviour, other similar animals will subsequently tend to learn the same thing more readily all over the world, as a result of a process called morphic resonance. The more that learn it, the easier it should become for others. This possibility was tested with day- old chicks using a simple ...
Two trials were conducted to test the hypothesis that broilers classified as good rather than poor feed converters (low vs. high feed-to-gain ratios, respectively) would show decreased activity (increased lethargy) and reduced fear of human caretakers. In both trials birds were reared to juvenile selection age when the 192 males with the "best" breast and leg conformation were placed into indiv...
The standard approach in accounting for hierarchical differentiation in biology and the social sciences considers a hierarchy as a static distribution of individuals possessing differing amounts of some valued commodity, assumes that the hierarchy is generated by micro-level processes involving individuals, and attempts to reverse engineer the processes that produced the hierarchy. However, suf...
We revisit the outlier hypothesis testing framework of Li et al. (TIT 2014) and derive fundamental limits for optimal test under generalized Neyman-Pearson criterion. In testing, one is given multiple observed sequences, where most sequences are generated i.i.d. from a nominal distribution. The...
Citation: Senar JC, Garamszegi LZ, Tilgar V, Biard C, Moreno-Rueda G, Salmón P, Rivas JM, Sprau P, Dingemanse NJ, Charmantier A, Demeyrier V, Navalpotro H and Isaksson C (2017) Urban Great Tits (Parus major) Show Higher Distress Calling and Pecking Rates than Rural Birds across Europe. Front. Ecol. Evol. 5:163. doi: 10.3389/fevo.2017.00163 Urban Great Tits (Parus major) Show Higher Distress Cal...
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