Developmental and territorial aspects of suckling behaviour in the domestic pig (Sus scrofa f. domestica)

The suckling behaviour of 327 piglets from 39 litters of primiparous domest ic sows Sus scrofa f. domestica was analysed regarding the development of t erritorial suckling consistency during a 5-week suckling period. Additional ly, the consistent use of a certain teat pair (1-7) during the whole suckli ng period was related to weight gain within the suckling period and to soci al dominance after weaning and mixing of the piglets. The piglets increased their suckling stability consistent with a three-parametric exponential mo del delivering a time-dependency that is typical for learning curves and wh ich may be a useful methodological approach for studies on behavioural onto geny. Thus, the development of suckling stability can be regarded as a cont inuous learning process. After extremely rapid learning within the first 4 days of life a moderate increase of suckling consistency with final stabili zation occurred within the second week. After this time, the piglets mainta ined a high suckling consistency of about 95% up to the end of the observed suckling period. The anterior teats were preferred, whereas piglets suckli ng at the posterior teats showed a tendency to have lower weight gains and poorer dominance values. However, the lowest suckling stability (consistenc y) was found with piglets occupying the middle teats. The study shows that individual differences (e.g. weight gain, position in a social hierarchy) h ave their roots in early ontogenetic characteristics of the neonates (e.g. suckling behaviour, physical strength). The results are discussed with rega rd to findings and interpretations of behavioural ontogeny in pigs.