Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for ResidualFeed Intake

Animal Industry Report, Mar 2018

The objective of this experiment was to examine the behavioral metric correlations and growth performance of barrows divergently selected for residual feed intake (RFI) during a Human Approach Test. Forty low- (LRFI, more feed efficient) and 40 high-RFI (HRFI, less feed efficient) barrows from the 8th generation Yorkshire selection lines were randomly selected. Barrows were evaluated in a Human Approach Test for zone crossing, zone 1 (defined as the mouth, nose, and/or face of the pig contact any part of zone 1), escape, freeze, urination and defecation frequencies and their effect on performance measures. Within the HRFI line, urination frequency accounted for 18.5% of the variation in ADG and 10th-rib back fat at off test (r= 0.43; P = 0.01) and 26% of the variation in loin eye area off test (r=-0.51; P = 0.001). Within the LRFI line, behavioral metrics did not significantly correlate with performance measures (P ≥ 0.07). In conclusion, urination frequency was moderately correlated with ADG, 10th-rib backfat- and loin eye area in HRFI barrows during Human Approach Test. Therefore, within the context of the ISU swine genetic selection program for improved lean accretion and feed efficiency, there were no negative behavioral metrics that determinately affected performance measures during the grow-finish period

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Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for ResidualFeed Intake

Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for ResidualFeed Intake Samaneh Azarpajouh 0 1 2 Iowa State University 0 1 2 0 1 2 Iowa State University 0 1 2 0 1 2 Anna Johnson 0 1 2 0 Azarpajouh , Samaneh; Colpoys, Jessica; Arkfeld, Emily; Gabler, Nicholas; Johnson, Anna; Dekkers, Jack; Huff-Lonergan, Elisabeth; Lonergan, Steven; Patience, John; and Stalder , Kenneth (2018) "Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for ResidualFeed Intake," Animal Industry Report: AS 664, ASL R3265. Available at: https://lib.dr.iastate.edu/ans_air/vol664/iss1/63 1 Iowa State University , USA 2 This Swine is brought to you for free and open access by the Animal Science Research Reports at Iowa State University Digital Repository. It has been accepted for inclusion in Animal Industry Report by an authorized editor of Iowa State University Digital Repository. For more information , please contact , USA Recommended Citation - AS 664 ASL R3265 See next page for additional authors Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for ResidualFeed Intake Authors Samaneh Azarpajouh, Jessica Colpoys, Emily Arkfeld, Nicholas Gabler, Anna Johnson, Jack Dekkers, Elisabeth Huff-Lonergan, Steven Lonergan, John Patience, and Kenneth Stalder This swine is available in Animal Industry Report: https://lib.dr.iastate.edu/ans_air/vol664/iss1/63 Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for Residual Feed Intake A.S. Leaflet R3265 Samaneh Azarpajouh, Post-Doctoral Research Associate; Jessica Colpoys, Graduate Research Assistant; Emily Arkfeld, Graduate Research Assistant; Nicholas Gabler, Associate Professor; Anna Johnson, Associate Professor; Jack Dekkers, Distinguished Professor; Elisabeth Huff-Lonergan, Professor; Steven Lonergan, Professor; John Patience, Professor; Kenneth Stalder, Professor, Department of Animal Science, Iowa State University Summary and Implications The objective of this experiment was to examine the behavioral metric correlations and growth performance of barrows divergently selected for residual feed intake (RFI) during a Human Approach Test. Forty low- (LRFI, more feed efficient) and 40 high-RFI (HRFI, less feed efficient) barrows from the 8th generation Yorkshire selection lines were randomly selected. Barrows were evaluated in a Human Approach Test for zone crossing, zone 1 (defined as the mouth, nose, and/or face of the pig contact any part of zone 1), escape, freeze, urination and defecation frequencies and their effect on performance measures. Within the HRFI line, urination frequency accounted for 18.5% of the variation in ADG and 10th-rib back fat at off test (r= 0.43; P = 0.01) and 26% of the variation in loin eye area off test (r=0.51; P = 0.001). Within the LRFI line, behavioral metrics did not significantly correlate with performance measures (P ≥ 0.07). In conclusion, urination frequency was moderately correlated with ADG, 10th-rib backfat- and loin eye area in HRFI barrows during Human Approach Test. Therefore, within the context of the ISU swine genetic selection program for improved lean accretion and feed efficiency, there were no negative behavioral metrics that determinately affected performance measures during the grow-finish period. Introduction Feed is one of the largest costs in pork production; therefore, improving feed efficiency can increase producer profitability. Residual feed intake (RFI) is used to measure feed efficiency. Pigs that consume less feed than expected for maintenance and growth have a lower RFI (LRFI) and are more feed efficient compared to higher RFI (HRFI) pigs. Colpoys and others (2014) reported that LRFI barrows were less reactive to novelty compared to barrows from the HRFI lines during the Human Approach Test. What remains unknown is how the behavior of LRFI and HRFI lines during a Human Approach Test affect performance during the grow-finish period. Therefore, the objective of this experiment was to examine the behavioral metric correlations and growth performance of barrows divergently selected for RFI during a Human Approach Test. Materials and Methods The protocol was approved by the Iowa State University Institutional Animal Care and Use Committee. Animals: Forty low-(LRFI, more feed efficient) and 40 high-RFI (HRFI, less feed efficient) barrows (46.5 ± 8.6 kg) from the 8th generation Yorkshire selection lines were randomly selected. Location: This work was conducted at the Lauren Christian Swine Research Center at the Iowa State University Bilsland Memorial Farm, near Madrid, IA. Human Approach Test: Barrows were evaluated individually within a 4.9 x 2.4 m test arena. Arena sides were lined with black corrugated plastic at a height of 1.2m. During testing, barrows were individually moved from their home pen to the test arena, which was located in a different room within the same building. Each individual barrow was placed for one minute in a weigh scale where it could not see the arena. At the conclusion of the one minute, the weigh scale door was opened into the back corner of the test arena. An unfamiliar human wearing orange coveralls was standing still at the center of the opposite wall. Each barrow voluntarily approached the human. The Human Approach Test lasted for 10 consecutive minutes (Figure 1). Behavioral acquisition: Three color cameras (Panasonic, Model WV-CP-484, Matsushita Co. LTD., Kadoma, Japan) were placed above the test arena. Video was collected and saved to a computer hard disk using Handy AVI (HandiAvi version 4.3 D, Anderson’s AZcendant Software, Tempe, AZ, USA) at 10 frames/seconds. Behavioral metrics: During the 10-minute Human Approach Test, barrows were continuously observed via video analysis for zone crossing, zone 1, escape and freeze frequencies by one observer using Observer software (The Observer XT version 10.5, Noldus Information Technology, Wageningen, The Netherlands). The frequency of urinations and defecations were collected live (Table 1). Performance measures: Performance measures were collected over the grow-finish period, and included ADG, feed conversion ratio, live weight, 10th-rib backfat-and loin eye area off test. The ADG was estimated as the slope from simple linear regression of weekly body weight on number of days on test. Feed conversion ratio was a rate measuring of the efficiency with which the body of barrows convert feed into the desired output. The10th-rib backfat- and loin eye area were measured by ultrasound using an Aloka 500V SSD ultrasound machine fitted with a 3.5-MHz, 12.5-cm, linear array transducer (Corometrics Medical Systems Inc., Wallingford, CT). Statistical analysis: All data were evaluated using the correlation procedure of SAS (version 9.3, SAS Inst. Inc., Cary, NC). Data were sorted by line and then within lines. Pearson correlation coefficients were determined among behavioral metrics and performance measures. Relationships were considered statistically significant at the P ≤ 0.05 level. For significant values the percent variation accounted for by the performance measure was calculated as the correlation coefficient (r) raised to the second power and multiplied by 100 (r2× 100). Results and Discussion Within the HRFI line, urination frequency accounted for 18.5% of the variation in ADG and 10th-rib back fat at off test (r= 0.43; P = 0.01) and 26% of the variation in loin eye area off test (r=-0.51; P = 0.001; Table 2). Within LRFI line, behavioral metrics did not significantly correlate with performance measures (P ≥ 0.07; Table 3). Conclusion In conclusion, urination frequency was moderately correlated with ADG, 10th-rib backfat- and loin eye area in HRFI barrows during Human Approach Test. Therefore, within the context of the ISU swine genetic selection program for improved lean accretion and feed efficiency, 1 movement, escape, freezing, urination and defection responses made by LRFI barrows during the Human Approach Test did not detrimentally effect these performance measures. Acknowledgements This project was supported by Agriculture and Food Research Initiative Competitive Grant no. 2011-6800430336 from the USDA National Institute of Food and Agriculture. We would like to thank Dana van Sambeek, Dr. Shawna Weimer, Dr. Monique Pairis-Garcia, Dr. Jennifer Young and the Lauren Christian Swine Research Center staff for assistance in data collection and animal care. Performance measures Feed conversion ratio2 Live weight3 10th-rib backfat4 Loin eye area4 Behavioral metrics (n) Zone crossing Zone 1 Escape Freeze Urination Defecation Behavioral metrics (n) Zone crossing Zone 1 Escape Freeze Urination Defecation r P-value r ADG 1High residual feed intake pigs consume more feed than expected for a given population. 2The ratio between feed intake and weight gain 3Off-test live weight data were collected prior to barrows leaving the farm. Targeted market weight was 118 kg or greater. 410th-rib back fat and loin eye area measurements occurred when mean barrow body weight was 121.5 ± 7.2 kg at 241 ± 7 d of age. Loin eye area4 1Low residual feed intake pigs consume less feed than expected for a given population. 2The ratio between feed intake and weight gain. 3Off-test live weight data were collected prior to barrows leaving the farm. Targeted market weight was 118 kg or greater. 410th-rib back fat and loin eye area measurements occurred when mean barrow body weight was 121.5 ± 7.2 kg at 241 ± 7 d of age.


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Samaneh Azarpajouh, Jessica Colpoys, Emily Arkfeld, Nicholas Gabler, Anna Johnson, Jack Dekkers, Elisabeth Huff-Lonergan, Steven Lonergan, John Patience, Kenneth Stalder. Behavioral Associations during a Human Approach Test and Performance of Barrows Divergently Selected for ResidualFeed Intake, Animal Industry Report, 2018,