The first aim of the study was to evaluate the effect of different dietary lysine (LYS) to energy (DE) ratios on the apparent ileal digestibility (AID) of crude protein (CP) and selected amino acids (AA) in growing pigs (40–60 kg) of different genotypes. The second aim was to classify genotypes into groups based on the AID of CP and AAs. The trials were conducted on a total of 90 cross-bred barrows (30 animals/genotype) in two replicates. Before the trial series, the experimental animals (average initial body weight (BW) = 40.9 ± 8.5 kg) were surgically fitted with post valve T-cannula (PVTC). The diets were formulated with six different total LYS/DE ratios. Titanium dioxide (TiO2) was added to the diets (5 g/kg) as an indigestible marker. Based on our results, it can be concluded that the LYS/DE ratio of the diets affected the AID of the CP and AA in different ways by each genotype (p < 0.05). It can also be concluded that pigs of different genetic potential can be classified with a high accuracy (91.7%) in respect of their CP and AA digestive capacity. Our results indicate the development of genetic-profile-based swine nutrition technologies as a future direction.

The aim of this study was to analyse the number of kindlings of Pannon White rabbit does, to get information about the risk factors affecting their reproductive performance success and to evaluate the suitability of this trait as a possible selection criterion. The pedigree information was supplied by the experimental farm of the Hungarian University of Agriculture and Life Sciences, who is responsible for the maintenance of the Pannon White rabbit breed. Total kindling number of 3371 Pannon White rabbit does born from 2000 up to 2022 were used in the analysis. Year-season and number of kits born alive were considered as fixed time dependent effects in the model and they both were significant (P < 0.001). The genetic variance was estimated to calculate the heritability for longevity. To demonstrate the extent of differences within the population, the ten best and worst bucks were compared based on the estimated risk of culling to check genetic differences. As number of kits born alive increased, the culling risk for this parameter decreased. After adjusting for the fixed effects, the estimated heritability of the total kindling number was h² = 0.14 (s.e. 0.034). The offspring of ten best and ten worst bucks were compared, revealing convincing evidence of principle that selection on this trait has a potential to improve the longevity of the Pannon White rabbits.