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Effects of Mixing on the Aggressive Behavior of Commercially Housed Pigs.

Rhim SJ, Son SH, Hwang HS, Lee JK, Hong JK - Asian-australas. J. Anim. Sci. (2015)

Bottom Line: The aggressive behaviors decreased in 75-day old pigs if compared to 25- and 50-day old animals.Post-mixing aggressive behavior was altered by previous experience of mixing.Aggressive behavior and DI are suitable methods for analyzing the effects of mixing on commercially housed growing pigs.

View Article: PubMed Central - PubMed

Affiliation: Swine Science Division, National Institute of Animal Science, Cheonan 331-801, Korea .

ABSTRACT
In this study, we investigated the effects of mixing on the aggressive behavior of commercially housed pigs. The behavioral patterns of 36 groups of pigs (a total of 360 animals) were observed over 3 consecutive days directly after weaning (25±1.2 days of age), and 25 and 50 days later with the aid of video technology. Fight latency and total duration and frequency of fighting were significantly different among the age groups. The aggressive behaviors decreased in 75-day old pigs if compared to 25- and 50-day old animals. Moreover, dominance index (DI) was higher in 25-day old and lower in 75-day old pigs. A comparison of dominant (DI>0) and submissive (DI<0) pigs showed significant differences (p<0.05) for major aggressive behaviors in all age groups. Dominant pigs were involved in more aggressive interactions, had longer fights, and initiated more fights than submissive pigs. Post-mixing aggressive behavior was altered by previous experience of mixing. Aggressive behavior and DI are suitable methods for analyzing the effects of mixing on commercially housed growing pigs.

No MeSH data available.


Related in: MedlinePlus

Dominance index of pigs after mixing at days 25, 50, and 75.
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f1-ajas-28-7-1038: Dominance index of pigs after mixing at days 25, 50, and 75.

Mentions: At day 25, more than three-fourths of the piglets had a DI between −0.2 and +0.2. There were 7 absolutely dominant piglets (DI = +1) and 1 animal was absolutely submissive (DI = −1). The mean DI was 0.03. At day 30, thirty pigs had no winner outcomes (DI = −1) in contrast to no pig which was absolutely dominant. The other dominant animals had an index lower than 0.8. The mean DI for the growing pigs was −0.19. At day 75, forty percent of the pigs had a DI between −0.2 and +0.2. There were 45 absolutely submissive pigs and 10 animals had a high index of 0.6. The mean DI of day 75 was 0.32 (Figure 1). Of the 360 pigs studied, 20 had no DI. These pigs either had no fights or the fight outcomes were uncertain.


Effects of Mixing on the Aggressive Behavior of Commercially Housed Pigs.

Rhim SJ, Son SH, Hwang HS, Lee JK, Hong JK - Asian-australas. J. Anim. Sci. (2015)

Dominance index of pigs after mixing at days 25, 50, and 75.
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC4478496&req=5

f1-ajas-28-7-1038: Dominance index of pigs after mixing at days 25, 50, and 75.
Mentions: At day 25, more than three-fourths of the piglets had a DI between −0.2 and +0.2. There were 7 absolutely dominant piglets (DI = +1) and 1 animal was absolutely submissive (DI = −1). The mean DI was 0.03. At day 30, thirty pigs had no winner outcomes (DI = −1) in contrast to no pig which was absolutely dominant. The other dominant animals had an index lower than 0.8. The mean DI for the growing pigs was −0.19. At day 75, forty percent of the pigs had a DI between −0.2 and +0.2. There were 45 absolutely submissive pigs and 10 animals had a high index of 0.6. The mean DI of day 75 was 0.32 (Figure 1). Of the 360 pigs studied, 20 had no DI. These pigs either had no fights or the fight outcomes were uncertain.

Bottom Line: The aggressive behaviors decreased in 75-day old pigs if compared to 25- and 50-day old animals.Post-mixing aggressive behavior was altered by previous experience of mixing.Aggressive behavior and DI are suitable methods for analyzing the effects of mixing on commercially housed growing pigs.

View Article: PubMed Central - PubMed

Affiliation: Swine Science Division, National Institute of Animal Science, Cheonan 331-801, Korea .

ABSTRACT
In this study, we investigated the effects of mixing on the aggressive behavior of commercially housed pigs. The behavioral patterns of 36 groups of pigs (a total of 360 animals) were observed over 3 consecutive days directly after weaning (25±1.2 days of age), and 25 and 50 days later with the aid of video technology. Fight latency and total duration and frequency of fighting were significantly different among the age groups. The aggressive behaviors decreased in 75-day old pigs if compared to 25- and 50-day old animals. Moreover, dominance index (DI) was higher in 25-day old and lower in 75-day old pigs. A comparison of dominant (DI>0) and submissive (DI<0) pigs showed significant differences (p<0.05) for major aggressive behaviors in all age groups. Dominant pigs were involved in more aggressive interactions, had longer fights, and initiated more fights than submissive pigs. Post-mixing aggressive behavior was altered by previous experience of mixing. Aggressive behavior and DI are suitable methods for analyzing the effects of mixing on commercially housed growing pigs.

No MeSH data available.


Related in: MedlinePlus