Nitrogen balance in growing pigs at various energy, threonine and methionine levels
1996
Prokop, V. (Vyzkumny Ustav Vyzivy Zvirat, Pohorelice (Czech Republic))
The nitrogen balance was assessed in the metabolic experiment with eight pigs of higher genotype (Seghers Hybrid) weighing 46 kg in average in four balance periods with two energy levels and two threonine and methionine levels using isoprotein and isolysine mixtures. In experimental groups I to IV, the average ingestion of crude protein was 257.9 g and LYS 14.7 g per pig and day. In feeding mixtures for pigs in groups I-II and III-IV the content of ME amounted to 12.9 and 13.6 MJ in 1 kg of mixture, respectively. The levels of THR and MET were lower in mixtures in groups I and III and higher in groups II and IV. Higher energy level and higher THR and MET levels affected positively the digestibility and nitrogen retention, the significant difference was found only in crude protein retention per 1 kg of live weight and day. Significant differences were also found in the fat digestibility and in ash digestibility. Significant differences were found in THR digestibility and in MET digestibility.
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