Effect of the lysine/energy ratio of the diet on the ileal digestibility of crude protein in growing pigs with different genetic potential

Tenke, János and Sudár, Gergő and Vida, Orsolya and Tossenberger, János (2023) Effect of the lysine/energy ratio of the diet on the ileal digestibility of crude protein in growing pigs with different genetic potential. ÁLLATTENYÉSZTÉS ÉS TAKARMÁNYOZÁS, 72 (2). pp. 113-125. ISSN 0230-1814

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Abstract

The aim of the study was to evaluate how the different lysine/digestible energy (DE) ratio of the diets effect on the apparent ileal digestibility (AID) of crude protein (CP) in growing pigs (40-60 kg) with different genetic potential. The trials were conducted a total of 90 animals (30 animals/genotype) with different genotypes ([Danish Yorkshire × Danish Landrace] × Danish Duroc; [Yorkshire × Landrace] × [Hampshire × Pietrain]; [Hungarian Yorkshire × Hungarian Landrace] × Duroc) in two replicates (n=10/treatment/genotype). Before the experiment series each of the barrows (avarage initial body weight = 40.9 ± 8.5 kg) were surgically fitted with post valve T-cannula (PVTC). The experimental diets were based on corn, barley and soybean meal, and formulated with 6 different total lysine/ digetible energy (DE) ratios (A: 0.55; B: 0.61; C: 0.68; D: 0.74 E: 0.80; F: 0.82). For the digestibility trials, as an indigestible marker, titanium dioxide (TiO2 ) was added to the diets (5 g/kg). The AID of the CP content of the diets were evaluated independently of the genotype (Genotype Indepedent Ileal Digestibility-GIID) and in genotype-specific aspect (Genotype Specific Ileal Digetibility-GSID). Based on our results, it can be concluded that the lysine/DE ratio of the diets affected the AID of the CP in a different ways by each genotype. Therefore the GIID assessment method occasionally over-evaluates, and in some cases under-estimates the CP digestibility in the different genotypes.

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