[Survey among keepers of endangered sheep and goat breeds on the influence of wolves on animal husbandry]. / Befragung von Haltern von vom Aussterben bedrohten Schaf- und Ziegenrassen zum Einfluss des Wolfes auf die Tierhaltung.

OBJECTIVE: As Germany's wolf population is steadily becoming more widespread, conflicts with livestock owners are increasing. In this context, the wolves' impact on grazing livestock is of particular interest. The study aimed to investigate the wolves' influence on the husbandry of endangered sheep and goat breeds. Thus, livestock owners were interviewed about the types of measures taken to protect their herds against wolf predation. MATERIAL AND METHODS: A questionnaire consisting of 11 questions was published online by the "Gesellschaft zur Erhaltung alter und gefährdeter Haustierrassen e. V. (GEH)" and completed anonymously by 494 sheep and goat owners from all over Germany. RESULTS: 33 % of the endangered sheep breeds and 80 % of the endangered goat breeds are owned by fewer than ten of the livestock owners, who predominantly keep these animals as a hobby or as a supplementary source of income. The cessation of livestock husbandry by any of these owners may therefore have a significant negative impact on the continued existence of the breed in question. However, the mean herd sizes of the studbook breeds do not indicate any negative impact on animal numbers in recent years, although the majority of respondents consider their grazing livestock to be threatened by wolves. It is noteworthy that significantly more livestock owners situated far away from wolf habitats expressed the wish to discontinue their husbandry as opposed to those within range of wolf habitats. Preventative measures mentioned most frequently are fencing and enclosures as well as avoiding certain areas entirely. The use of guard dogs does not seem to play a major role. CONCLUSIONS: The abandonment of animal husbandry by individual farmers poses the risk of reducing breed diversity in small ruminants. Therefore, they need special protection, which must be taken into account when planning and defining compensation measures.

The Basal Radial Glia Occurs in Marsupials and Underlies the Evolution of an Expanded Neocortex in Therian Mammals.

A hallmark of mammalian brain evolution is the emergence of the neocortex, which has expanded in all mammalian infraclasses (Eutheria, Marsupialia, Monotremata). In eutherians, neocortical neurons derive from distinct neural stem and progenitor cells (NPCs). However, precise data on the presence and abundance of the NPCs, especially of basal radial glia (bRG), in the neocortex of marsupials are lacking. This study characterized and quantified the NPCs in the developing neocortex of a marsupial, the tammar wallaby (Macropus eugenii). Our data demonstrate that its neocortex is characterized by high NPC diversity. Importantly, we show that bRG exist at high relative abundance in the tammar indicating that this cell type is not specific to the eutherian neocortex and that similar mechanisms may underlie the formation of an expanded neocortex in eutherian and marsupial mammals. We also show that bRG are likely to have been present in the therian ancestor, so did not emerge independently in the eutherian and marsupial lineages. Moreover, our data support the concept that changes in multiple parameters contribute to neocortex expansion and demonstrate the importance of bRG and other NPCs for the development and expansion of the mammalian neocortex.