Animal Welfare and Behavior Flashcards

A finishing pig herd exhibits tail-biting despite adequate space allowance (0.8 m²/pig) and ad libitum feeding. Environmental enrichment has been provided. Which underlying physiological mechanism is most likely perpetuating the behavior once initiated in the group?

Answer: Blood odor acting as an appetitive releaser that overrides social inhibition in conspecifics

Once tail wounds bleed, the hemoglobin-derived compounds and iron in blood act as powerful appetitive releasers in pigs, stimulating further biting even in individuals not originally motivated to tail-bite. This olfactory/gustatory signal overrides the social inhibition that normally limits inter-individual aggression, making the behavior self-perpetuating regardless of other husbandry corrections. This is why prompt isolation of the victim—not just enrichment—is the critical welfare intervention once bleeding has begun.

Which combination of Five Domains model criteria best captures the welfare state of a laboratory beagle undergoing repeated aversive conditioning trials but showing no overt pain behaviors and maintaining normal bodyweight?

Answer: Impaired in Domain 4 (Behavioral Interactions) and Domain 5 (Mental State) primarily

The Five Domains framework (Mellor et al.) recognizes that welfare comprises physical domains (Nutrition, Environment, Health, Behavioral Interactions) that feed into Domain 5 (Mental State). Repeated aversive conditioning primarily compromises Domain 4 (Behavioral Interactions—the animal's capacity to express normal species-typical behavior and control social/environmental interactions) and Domain 5 (Mental State—negative affective experience, fear, helplessness). Physical domains may be intact, but the framework explicitly requires assessment of functional behavior and affective state, not just physical health markers.

A dairy herd has a mean lying time of 11.2 hours/day per cow (measured by data loggers), which meets the commonly cited ≥10 h target. However, 23% of cows have bouts with a lying-bout duration coefficient of variation >40%. What welfare inference is MOST defensible from this finding?

Answer: A subset of cows likely faces competition or physical barriers disrupting normal lying rhythm, masking a subpopulation welfare problem

Group means for lying time can conceal important within-herd variation. A high coefficient of variation in lying-bout duration indicates that some animals are experiencing interrupted lying patterns—consistent with competitive displacement at stalls, lameness causing difficulty lying/rising, or physical barriers—even when the group mean is acceptable. This highlights the limitation of using group means alone and the need to examine distributional statistics. The CV itself is not a validated stocking density proxy (option B), and while rumination is influenced by posture, the direct causal link to reticuloruminal motility stated in option D is overstated.

In applied ethology, a broiler flock scored via the Welfare Quality® protocol shows low Qualitative Behavior Assessment (QBA) scores for 'content' and 'relaxed' but normal gait scores, normal litter quality, and no ammonia exceedance. Which methodological consideration MOST limits interpreting the QBA finding as indicative of poor welfare?

Answer: QBA captures the observer's emotional attribution to the flock rather than individual-level affective state, and inter-observer reliability can vary substantially without calibration

QBA (Qualitative Behavior Assessment) is a validated tool in which trained observers rate the overall expressive quality of an animal group on bipolar descriptors. Its limitation is that it measures the observer's gestalt impression of the group's behavioral expression—a form of emotional attribution—rather than directly measuring individual affective states. Without rigorous inter-observer calibration, scores can diverge between assessors. Crucially, physical domain indicators being normal does NOT invalidate QBA findings (welfare is multidimensional), and current ethological consensus does accept that broilers have capacity for basic affective states. QBA has demonstrated repeatability with proper calibration, so blanket unreliability (option A) is incorrect.

A zoo elephant shows stereotypic weaving during keeper approach at feeding time. Management proposes eliminating the behavior by switching to scatter feeding and unpredictable feeding schedules to reduce anticipatory arousal. What is the MOST likely welfare consequence of this intervention, based on current behavioral neuroscience?

Answer: Increased weaving because unpredictability elevates chronic HPA axis activation, worsening negative affective state

Stereotypies that emerge in anticipation of resources represent a frustration-based response but also signal that the animal has a temporally predictable positive event to anticipate. Unpredictable schedules may reduce anticipatory stereotypy acutely, but loss of temporal predictability is itself a chronic stressor: animals cannot form reliable expectancies, which elevates HPA axis activity and generates a state of learned helplessness or chronic anxiety. Current understanding distinguishes between eliminating the behavioral symptom and improving the underlying affective state—unpredictability trades one problem (frustration at resource timing) for a worse one (chronic unpredictability stress). Scatter feeding is a valuable enrichment, but pairing it with unpredictable schedules specifically to suppress the stereotypy is a welfare-negative approach.

Under the Russell and Burch 3Rs framework, which scenario represents the application of Refinement at the highest level of implementation priority, as subsequently elaborated by Balls et al. (1995)?

Answer: Adopting continuous telemetric monitoring to detect pain endpoints earlier and implement humane endpoints sooner

Balls et al. (1995) stratified Refinement into three levels: (1) improvements to husbandry and care, (2) improvements to experimental procedures, and (3) implementation of humane endpoints. Early humane endpoints—enabled here by continuous telemetric monitoring that provides objective, real-time physiological data—represent the highest-priority Refinement intervention because they directly reduce the severity and duration of suffering. Replacing a model is Replacement (not Refinement). Reducing n is Reduction. Anesthetic choice (isoflurane vs. ketamine) improves procedural welfare (level 2 Refinement) but does not address the critical welfare gain of earlier humane endpoint detection that continuous telemetry affords.