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Replication data for: Redefining dominance calculation: Increased competition flattens the dominance hierarchy in dairy cows
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Sheng, Kehan; Foris, Borbala; Krahn, Joseph; Weary, D.M; von Keyserlingk, M.A.G — 2023-12-15 Dominance hierarchies are known for mitigating conflicts and guiding priority of access to limited resources in gregarious animals. The dominance hierarchy of dairy cows is typically constructed using agonistic interactions, usually monitored at the feed bunk right after fresh feed delivery when competition is high resulting in numerous interactions. Yet, the outcome of agonistic interactions under time of high competition time may be more influenced by cows’ high valuation of fresh feed than their intrinsic dominance attributes. Thus, the dominance hierarchy constructed using agonistic interactions under high versus low competition times might differ. The aim of this study was to test how the structure of the dominance hierarchy changes in relation to different levels of competition. We monitored a dynamically changing group of 48 lactating dairy cows over 10 mo with 6 cows exchanged every 16 d, totally 159 cows. We used a validated algorithm to continuously detect the actor and reactor of replacement behaviors as cows competed for feed. We calculated feeder occupancy, the percentage of occupied feed bins, to characterize competition at the moment of each replacement, and created 25 corresponding dominance hierarchies using Elo ratings for occupancy levels ranging from 13% to 100%. With each 10% rise in feeder occupancy, hierarchy steepness fell by 0.02 (R2 = 0.96) and two-way dyads rose by 1.3% (R2 = 0.84). The win rate of the dominant cow within dyads declined with increased feeder occupancy (y = -0.11x -0.21, P < 0.001). Our findings provide evidence that there is noticeable variation in inferred hierarchies based on the competition context, with high competition flattening the hierarchy as subordinate animals succeed more in replacing others in order to gain feed access. This finding underscores that during heightened competition, the valuation of resources impacts agonistic behaviors and the subsequently constructed dominance hierarchy more than the individual's intrinsic dominance attributes. We recommend that researchers avoid using agonistic interactions occurring immediately after fresh feed delivery to establish dominance hierarchies. We also urge researchers to differentiate agonistic interactions based on context when constructing dominance hierarchies to draw inferences on animal behavior, cognition and health.
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Replication Data for: Crowd sourcing remote comparative lameness assessments for dairy cattle
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Sheng, Kehan; Foris, Borbala; von Keyserlingk, M.A.G; Gardenier, John; Clark, Cameron; Weary, D.M — 2023-04-05 Lameness assessments are rarely conducted routinely on dairy farms and when completed typically underestimate lameness prevalence, hampering early diagnosis and treatment. A well-known feature of many perceptual tasks is that relative assessments are more accurate than absolute assessments, suggesting that creating methods that allow for the relative scoring of ‘which cow is more lame’ will allow for reliable lameness assessments. Here we developed and tested a remote comparative lameness assessment method: we recruited non-experienced crowd workers via an online platform and asked them to watch two videos side-by-side, each showing a cow walking, and to identify which cow was more lame and by how much (on a scale of -3 to 3). We created 11 tasks, each with 10 video pairs for comparison, and recruited 50 workers per task. All tasks were also completed by 5 experienced cattle lameness assessors. We evaluated data filtering and clustering methods based on worker responses and determined the agreement among workers, among experienced assessors, and between these groups. A moderate to high interobserver reliability was observed (intraclass correlation coefficient, ICC=0.46 to 0.77) for crowd workers and agreement was high among the experienced assessors (ICC=0.87). Average crowd worker responses showed excellent agreement with the average of experienced assessor responses (ICC= 0.89 to 0.91), regardless of data processing method. To investigate if we could use fewer workers per task while still retaining high agreement with experienced assessors, we randomly sub-sampled 2 to 43 (1 less than the minimum number of workers retained per task after data cleaning) workers from each task. The agreement with experienced assessors increased substantially as we increased the number of workers from 2 to 10, but little increase was observed after 10 or more workers were used (ICC>0.80). The proposed method provides a fast and cost-effective way to assess lameness in commercial herds. In addition, this method allows for large-scale data collection useful for training computer vision algorithms that could be used to automate lameness assessments on farm.
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Replication Data for: Automated, longitudinal measures of drinking behaviour provide insights into the social hierarchy in dairy cows
Borealis
Foris, Borbala; Vandresen, Bianca; Sheng, Kehan; Krahn, Joseph; Weary, D.M; von Keyserlingk, M.A.G — 2023-11-20 Water is an essential resource for dairy cattle, and in some circumstances cattle will compete with one another to gain access to water. Here we applied a Bayesian-based, Elo-rating method to assess the winning probabilities of 87 cows housed in a dynamic group and compared the resulting social hierarchies based on their steepness. We identified a hierarchy at the drinker with a steepness of 0.55±0.02 whereas the hierarchy detected at the feeder during the same time period was less steep (0.45±0.02), indicating smaller average differences between the winning probabilities of cows when competing for feed compared to competing for water. Individual cows’ winning probabilities at the feeder and drinker were moderately correlated (rs=0.55, P<0.001). However, cows at both the lower and upper ends of the hierarchy demonstrated a consistent alignment. We compared drinker hierarchies between periods with THI above and below 72 and found similar steepness (0.54±0.03 and 0.56±0.03 respectively) and the individual winning probabilities of cows were highly correlated between hot and normal periods (rs=0.87, P<0.001). Individual drinking behaviour was also associated with the drinker hierarchy, cows with higher winning probability had lower average daily visit frequency (hot: rs=-0.40, P<0.01, normal: rs=-0.33, P<0.01) and higher average daily water intake (hot: rs=0.38, P<0.01, normal: rs=0.37, P<0.01). We also found evidence that cows differ in when they drink, depending on their winning probability; less successful cows shifted their drinking times to before or after the visit peak after milking. Automatically identifying cows with consistently high or low winning probabilities using drinkers may inform grouping decisions and water provision on farms.
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Replication Data for: Effects of group size on agonistic interactions in dairy cows: a descriptive study
Borealis
Krahn, Joseph; Foris, Borbala; Sheng, Kehan; Weary, D.M; von Keyserlingk, M.A.G — 2024-01-02 Group-housed cattle sometimes engage in agonistic competitive behavior over resources such as feed, which can negatively affect aspects of welfare. Little is known about how contextual factors such as group size influence agonistic behavior. We explored the frequency of agonistic interactions at the feeder when cattle were housed in different sized groups. We also explored the consistency of the directionality of agonistic interactions in dyads and of the number of agonistic interactions initiated by individuals across the group sizes. Four replicates of 50 cows each were assessed in two group-size phases. In Phase 1, cows were kept in one group of 50. In Phase 2, these same cows were divided into 5 groups of 10, maintaining stocking density (i.e., ratio of animals to lying stalls and feed bunk spaces). We measured agonistic replacements (i.e., interactions that result in one cow leaving the feed bin and another taking her place) at an electronic feeder using a validated algorithm. We used these data from Phase 1 to calculate individual Elo-ratings (a type of dominance score). Cows were then categorized into 5 dominance categories based upon these ratings. To ensure a consistent Elo-rating distribution between phases, 2 cows from each dominance category were randomly assigned to each small group of 10 cows. The mean±SE number of replacements per cow was similar regardless of whether the cows were housed in groups of 50 (34.1±2.4) or 10 (31.1±5.0), although the groups of 10 were more variable. Further, 81.5±5.2% of dyads had the same directionality across group sizes and individuals were moderately consistent in the number of replacements they initiated (ICC=0.62). These results indicate that the relationship between group size and agonistic behaviour is complex; we discuss these challenges and suggest new avenues for further research.

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(Author: Sheng, Kehan)

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