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Novel arena

Conducted at 2 days old

Behaviours observed from novel arena testing of 2 day old commercial leghorn chickens after experiencing hatchery routines compared to a control group which did not experience hatchery routines. A): Percentage time spent in start box for the duration of testing. B): The rate of transverses between different sections of the arena per minute spent outside the start box. C): Percent time spent performing exploration behaviours after leaving the start box. D): Percentage time spent standing in a relaxed state after exiting the start box. E): The rate of comfort behaviours performed per minute after leaving the start box. F) The rate of pecks towards a conspecific per minute after leaving the start box. The graphs depict either mean rate per minute or mean percentage time ± SE.

When looking at the percentage time performing behaviours the hatchery chickens spent a significantly lower percentage time performing the following behaviours; total exploration (Figure 7: C), walking, standing relaxed (Figure 7: D), preening, dustbathing, exploring ground, exploring objects (p<0.05, for complete list of p values see: Appendix: Table 4). The hatchery group spent a significantly higher percentage time in start box (p<0.05) (Figure 7: A) and a tendency towards a higher percentage time escaping (p<0.1). Lower rate per minute; transverses (Figure 7: B), conspecific pecks (Figure 7: F), total explorative pecks, comfort behaviours (Figure 7: E), feather ruffle, ground pecks, object pecks (p<0.05).

When comparing hatchery males to control males it was found that hatchery males spent a lower percentage time performing; total exploration, standing relaxed, exploring ground, exploring object, preening (p<0.05). Hatchery males also spent a higher percentage time in start box (p<0.05). Hatchery males also had a lower rate per minute for the following behaviours when compared to the control males; total explorative pecks, comfort behaviours, ground pecks, object pecks (p<0.05). There was also a tendency towards hatchery males performing transverses and scratch body at lower rate per minute when compared to control males (p<0.1).

When comparing hatchery females to control females, hatchery females spent a significantly lower percentage time walking, standing relaxed, and exploring the ground (p<0.05). Hatchery females also had a tendency towards spending a higher percentage time in the start box and standing alert (p<0.1). Hatchery females also had showed tendency towards a lower percentage time spent sleeping (p<0.1). When compared to control females, hatchery females performed the following behaviours at a significantly lower rate per minute; feather ruffles, ground pecks, object pecks (p<0.05). Hatchery females also showed a tendency towards performing transverses and total explorative pecks at a lower rate per than control females (p<0.1).

Conducted at 6 weeks old

Behaviours observed during novel arena testing commercial leghorn chickens at 6 weeks of age after experiencing hatchery routines compared with those of a control group which did not undergo hatchery routines A) The rate in minutes of comfort behaviours performed after exiting the start box. B) Percentage time spent drinking after leaving start box. C) The percentage time spent running whilst outside start box. D) The rate of conspecific pecks performed after leaving start box. The graphs depict either mean rate per minute or mean percentage time ± SE.

The results of the novel arena testing conducted at 6 weeks of age showed that hatchery chickens spent a significantly lower percentage time running (Figure 8: C) and drinking (Figure 8: B) when compared to control chickens (p<0.05, for full list of p values see Appendix: Table 5). Hatchery chickens also showed a significantly lower rate of feather ruffles and conspecific pecks (Figure 8: D) per minute than control chickens (p<0.05), however hatchery chickens showed a tendency to perform a higher rate of wing stretches per minute than control chickens (p<0.1).

          When comparing the results for hatchery males versus control males, hatchery males performed a significant lower percentage time running that control males (p<0.05). Hatchery males also showed a tendency to perform a lower rate of feather ruffles per minute than control males (p<0.1).

          Hatchery females performed drinking behaviours for a significantly lower percentage time than control females (p<0.05). Hatchery females, however, showed a tendency to spend a higher percentage time sitting relaxed than control females (p<0.1). When looking at feather ruffle behaviours, hatchery females showed a tendency to perform this behaviour at a lower rate than control females (p<0.1). Hatchery females also performed leg stretching, wing stretching and all comfort behaviours (Figure 8: A) at a significantly higher rate per minute than control females.


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Last updated: 05/22/18