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Poster communications

Impact of aggressiveness on feeding behaviour, pubertal development and fat androstenone of entire male pigs

Abstract : In boars, social behavior could influence pubertal development and feeding behavior. The objectives of the study were to determine the relationships between aggressiveness, feeding behavior and pubertal development and their influence on fat androstenone. A total of 216 boars of two different crossbred genotypes were used. They were raised in groups of 12 pigs/ pen. Animals were observed for 10 hours/day either at the beginning or at the end of fattening. Agonistic behaviors (fighting, hitting, biting, threatening, chasing) and skin lesions (an indicator of aggressiveness) were counted 48 hours after entering the fattening pen, in their pen before the first departure for slaughtering, and on the carcass. Data obtained from the electronic feeders were used to determine the feeding behavior (number and duration of meals, feed intake) over 96-hour periods. At the end of the fattening period, blood was sampled to measure estradiol and testosterone. At slaughter, fat was collected to measure androstenone. The protocol was approved by the local ethical committee. Prior to statistical analysis, variables were normalized if needed. For each genotype, Pearson correlations were calculated on variables corrected for the pen effect. In one genotype, significant positive correlations (P<0.05) were demonstrated between the number of skin lesions at slaughter, estradiol (r=0.42), testosterone (r=0.26) or androstenone (r=0.38). These correlations were low (r<0.04, P>0.1) in the other genotype probably because the measured concentrations of sex hormones were too low (38.6±3.5 vs 55.1±95 pg/ml for estradiol; and 1.43±0.14 vs 2.86±0.31 ng/ml for testosterone). In both genotypes, significant positive correlations were found between the numbers of sexual and agonistic behaviors at the beginning of fattening (r=0.53 and r=0.28). Finally, boars with the most numerous skin lesions at the beginning of the fattening period were also the biggest eaters in the middle of the fattening period (r=0.41 and r=0.21).
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Poster communications
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https://hal.inrae.fr/hal-02742334
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Submitted on : Wednesday, June 3, 2020 - 3:55:08 AM
Last modification on : Wednesday, November 3, 2021 - 6:51:00 AM

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  • HAL Id : hal-02742334, version 1
  • PRODINRA : 369731

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Séverine Parois, Geoffrey Bissianna, Sabine Herlemont, Marie-José Mercat, Benoit Blanchet, et al.. Impact of aggressiveness on feeding behaviour, pubertal development and fat androstenone of entire male pigs. 50. Meeting of the International Society for Applied Ethology (ISAE), Jul 2016, Edinburgh, United Kingdom. Wageningen Academic Publishers, 2016, Proceedings of the 50th Congress of the International Society for Applied Ethology. ⟨hal-02742334⟩

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