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cients and by establishment of multiple linear correlations. The female population studied was characterized by a high proportion of primiparous animals (!3 p. 100 ) and small weight gains during the reproductive cycle (! 16. 7 kg). The duration of the weaning-oestrus interval and weaning-conception interval were negatively correlated with the litter order (o.2II and o.i88, respectively for the two intervals) and the weight of the sows at weaning (— 0.17 8 and -0.16!). However, the share of the variance explained by these two parameters was restricted (R I 0.5 ). This was also the case for prolificacy which was only significantly correlated with the duration of weaning-oestrus or weaningconception intervals (r ! o.16 4) and the variation in the weight of the sows between weaning and mating (r 0.188). This weight variation was related to the weight of the sows at weaning (r = 0.4S5 )and to the duration of the weaning-oestrus interval (r = 0.594 ), these two factors accounting for 48 p. 100 of the variation. Although this study has been made on animals exhibi-

Duration of weaning-oestrus interval and prolificacy of sows : statistical study of the influence of various reproductive parameters