Fig. 1

Inter-piglets birth interval (min) according to birth order. A Inter-piglet birth interval according to birth order grouped by terciles. Birth order between 2 and 7 was considered as the first tercile (1/3; n = 464 piglets) of piglets born, birth order between 8 and 16 was considered the second tercile (2/3; n = 430 piglets) and birth order between 17 and 25 was considered the last tercile (3/3; n = 279 piglets)). B Inter-piglet birth interval for each birth order. The birth interval of the first piglet (birth order 1) was not included as it was considered as zero. Data are presented as mean ± SEM. Different letter means statistical significance at p < 0.01