Samenvatting

The objective of the present study was to investigate the influence of age, body weight, and the average daily gain at first insemination on the litter’s size of Topigs Norsvin TN70 gilts. This research was implemented in a specific pathogen-free (SPF) commercial swine farm which is located in the eastern part of Germany. Data was exported from the data system of the farm, TN 70 gilts were inseminated and farrowed from 1st May 2019 to 30th May 2020, the gilt without BW information and litter’s size data were filtered out from the sample. This study found out that the age at first inseminating had negative correlation with TB (P ≤ 0.002, R2=0.009) and BA (P< 600 g/d TB (13.74 ± 3.15) and BA (13.08 ± 3.45). In conclusion, Gilts inseminating between 240- 249 days’ age and 260-269 days’ age with ADG 661-699 have the corresponding the body weight range: 167- 181 kg might have an optimal litter size. For the field particle, it is recommended to inseminated gilts from 240 days’ age to 270 days’ age with an optimal ADG 600-700 g/d and a body weight between 165-180 kg.