Reliability of the Welfare Quality - Animal Welfare Assessment Protocol for Growing Pigs

Transcription

1 Faculty of Agricultural and Nutritional Science Christian-Albrechts-University Kiel Institute of Animal Breeding and Husbandry Reliability of the Welfare Quality - Animal Welfare Assessment Protocol for Growing Pigs I. Czycholl 1, C. Kniese 2, L. Schrader 2, J. Krieter 1 1 Institute of Animal Breeding and Husbandry, Christian-Albrechts-University Kiel. 2 Institute of Animal Welfare and Animal Husbandry, Friedrich Loeffler Institut Celle 65 th Annual EAAP Meeting Copenhagen, Denmark, August 25 th to 29 th, 2014 Session 54, abstract number 18597, iczycholl@tierzucht.uni-kiel.de

2 Animal Welfare 2/15 -ihre-pension-an/news Physiological health Positive emotions Psychological health

3 Welfare Quality 3/15 Is the Animal Welfare Assessment Protocol for Growing Pigs a reliable method for assessing Animal Welfare?

4 Introduction Materials & Methods Results Discussion & Conclusion Welfare Quality 4/15 IP (Individual Parameters) BO (Behavioural Observations) HAR (Human Animal Relationship) QBA (Qualitative Behaviour Assessment)

5 Welfare Quality 5/15 1. Qualitative Behaviour Assessment (QBA) (4-6 observation points, animals) active relaxed fearful 2. Behavioural observations (BO) (3 observation points, animals) 3. Human Animal Relationship Test (HAR) (10 pens, animals) 4. Individual parameters (IP) (10 pens, animals)

6 Introduction Materials & Methods Results Discussion & Conclusion Experimental Setup 6/15 29 combined assessments Trained observers Interobserver Reliability Study Same time Same animals Independent from each other

7 Statistical Parameters 7/15 Nonparametric measure of correlation of the observers Reliability and agreement parameters ICC Intraclass Correlation SDC Smallest Detectable Change Proportion of variance of observers to residual variance Expression of the measurement error (error that is not attributed to true changes) Calculation of the difference between each pair of observers and reference interval

8 Qualitative Behaviour Assessment (QBA) Mean values [mm] and agreement parameters 8/15 Observer1 [mm] Observer2 [mm] RS ICC SDC LoA active relaxed fearful agitated calm enjoying

9 Qualitative Behaviour Assessment (QBA) Mean values [mm] and agreement parameters 9/15 Observer1 [mm] Observer2 [mm] RS ICC SDC LoA active relaxed fearful agitated calm enjoying

10 Qualitative Behaviour Assessment (QBA) Mean values [mm] and agreement parameters 10/15 Observer1 [mm] Observer2 [mm] RS ICC SDC LoA active relaxed fearful agitated calm enjoying

11 Behavioural Observations (BO) Mean values of behavioural categories [%] and agreement parameters 11/15

12 Human Animal Relationship Test (HAR) Limits of Agreement of the differences of two observers 12/15 RS: 0.47 // ICC: 0.50 // SDC: 0.30

13 Individual Parameters (IP) 13/15 Limits of Agreement of the differences of two observers Tail biting Bursitis RS: 0.52 // ICC: 0.47 // SDC: 0.02 RS: 0.45 // ICC: 0.27 // SDC: 0.26

14 Discussion & Conclusion 14/15 1) Qualitative Behaviour Assessment Not reliable Not a suitable method for the measurement of positive emotions 2) Behavioural Observations Good reliability Validity? Video observations 3) Human Animal Relationship Test No statement possible due to experimental design Intraobserver Reliability Study 4) Individual Parameters Good reliability for most of the parameters Exception: Bursitis Some parameters occured only rarely or not at all

15 15/15 Thank you for your attention! This project has been funded with support of the BMELV.

16 Appendix Agreement vs. Reliability 16/15 Agreement vs. Reliability: Agreement: how good is agreement between repeated measurements Reliability: how well can study objects be distinguished from each other despite measurement error Related to variability between study objects

17 Appendix Formulas SEM/SDC/LoA 17/15 Standard Error of Measurement: SEM = error Limits of Agreement: LoA SDdiff=( 2*SEM) Smallest Detectable Change: SEM = 1.96* 2*SEM

18 Appendix Limits of agreement of the QBA term calm 18/15 Qualitative Behaviour Assessment calm RS: 0.86 // ICC: 0.66 // SDC: 0.24