Abstract
In recent years, an increased number of studies have dealt with the analysis of social dominance related to animal behavior, physiology, and performance. This study aimed to investigate whether hierarchical ranking affects the coping style, non-social behavior during open field and novel object tests, performance, and physiological parameters of pigs. A total of 48 growing pigs (24 barrows and 24 females) were mixed three times during the growing–finishing period. The social and non-social behaviors of pigs were directly noted, and three behavioral tests were performed during the experimental period. Performance and physiological parameters were also recorded. Statistical analysis considered hierarchical classification (dominant vs. intermediary vs. subordinate) and p-values ≤ 0.05 were considered significant. After three regroupings, the pigs in different hierarchical classifications showed no change in hair cortisol values and open-field and novel object tests. Mean corpuscular hemoglobin concentration and leukocyte values increased in intermediary pigs, and the lowest counts were found in pigs classified as dominants. Furthermore, dominant pigs visited the feeder more but spent shorter time there compared to subordinate and intermediary pigs. Our results suggest that hierarchical classification influenced feeding behavior and physiological parameters without affecting cortisol values and growth performance, demonstrating a possible compensation skill.
Funder
Spanish Program of Research
Subject
General Veterinary,Animal Science and Zoology
Reference64 articles.
1. The establishment and nature of the dominance hierarchy in the domesticated pig;Meese;Anim. Behav.,1973
2. The concept and definition of dominance in animal behavior;Drews;Behaviour,1993
3. Finding a dominance order most consistent with a linear hierarchy: An improved algorithm for the I&SI method;Schmid;Anim. Behav.,2013
4. Tong, X., Shen, C., Chen, R., Gao, S., Liu, X., Schinckel, A.P., and Zhou, B. (2019). Reestablishment of Social Hierarchies in Weaned Pigs after Mixing. Animals, 10.
5. The concept of stress and its relevance for animal behavior;Adv. Study. Behav.,1998