Animals

Socialisation with humans and willingness to interact with them are essential traits for animals involved in animal-assisted services (AAS). This study examined whether goats without prior intensive socialisation with humans may show predispositions to AAS in terms of sociability towards people. Ten goats underwent four tests: (1) acceptance of human approach and touch, voluntary approach to (2) a passive and (3) an active human, and (4) a novel sound fear test. Tests 1–3 were conducted with the caretaker and a familiar neutral person, and 4 with the neutral person. The goats generally accepted being approached and touched but showed little interest in interacting voluntarily with humans. Goats’ responses did not differ between the caretaker and the neutral person (p > 0.05). In the fear test, goats escaped less often and returned more quickly after the sound playback when a human was present (p < 0.01). Female goats exhibited higher sociability towards humans. Overall, the goats demonstrated some predispositions to AAS, such as tolerance of human contact and a tendency to perceive humans as a source of support during stress. However, these traits alone are insufficient for participation in AAS. Additional training is needed to increase the goats’ willingness to initiate interactions with people.

To investigate the factors affecting the utilization of retired Thoroughbred racehorses in equestrian disciplines, Bayesian linear mixed models were separately fitted using rank, round time, and obstacle faults from show-jumping competitions restricted to retired Thoroughbred racehorses as dependent variables, with the interaction between horse sex and the interval from race retirement to competition (as a proxy for transition training to show-jumping) as a fixed effect. When the interval was short (≤1 year), the estimated marginal mean of rank was statistically significantly lower in stallions (0.26) than in mares (0.41) and geldings (0.39). However, ranking improved with longer intervals in all sexes, with the greatest improvement observed in stallions, and the significant sex-related differences disappeared at the 3-year interval, suggesting an effect of transition training on ranking. Round time improved significantly with longer intervals in all sexes, consistent with the ranking pattern; significant improvement in obstacle faults was observed only in stallions and geldings. The explanatory power of the models, including major random effects, rider, horse ability, sire and affiliation after retirement, was moderate (conditional R²: 0.40–0.65), whereas that of the fixed effects was small (marginal R²: 0.02–0.07), indicating the multifactorial nature of success in competition.

The light spectrum is a key factor in aquaculture, but its effects on molecular stress responses during early fish development are unclear. This study examined how light of different wavelengths (spectra) affects embryos of Baikal whitefish Coregonus baicalensis and its hybrid with Yenisei hump-snout whitefish C. fluviatilis. Eggs were incubated from 35 days post-fertilization under white light (1.8 and 20 µmol m⁻² s⁻¹), darkness, red (peak at 631 nm), green (peak at 507 nm) and blue (peak at 459 nm) light. We analyzed relative telomere length, telomerase activity, blood profiles, and expression of stress-related genes (HSP-90, MtCK) at key developmental stages. Notably, a significant increase in telomere length was observed throughout early development (from embryo to larva to fry), independent of the light spectrum. Red light and darkness acted as potent stressors, indicating proteotoxic stress and energy imbalance. In Baikal whitefish, this was accompanied by notable telomere shortening at the earliest stage and elongation at later stages under certain conditions, potentially mediated by increased telomerase activity, a response that may be metabolically costly. Conversely, green light was the most neutral. The effect of blue light differed between Baikal whitefish and its hybrid, with the hybrid proving more sensitive. Furthermore, high-intensity white light (20 µmol m⁻² s⁻¹) also induced negative effects in the hybrid, such as increased telomere length, suggesting that excessive irradiance itself can be a stressor, independent of spectral composition. We conclude that darkness or a predominance of red light is suboptimal for incubating these whitefish, while green light provides a more favorable environment, offering a basis for optimizing aquaculture light conditions.