Nitrogen balance in growing pigs at various protein and amino acids levels
1995
Prokop, V. (Research Institute of Animal Nutrition, Pohorelice (Czech Republic))
The nitrogen balance was assessed in the balance experiment with eight pigs of higher genotype (Seghers Hybrid), at a mean weight of 43 kg, in four balance periods with four levels of crude protein and amino acids and using isoenergic mixtures. The average nitrogen and lysine intakes in groups I to IV were 36.0, 37.6, 40.2 and 42.4 and 10.4, 12.6, 14.3 and 15.7 g per animal per day respectively. Nitrogen digestibility amounted to 81.4, 82.5, 83.1 and 83.8 percent in this sequence. From the nitrogen ingested, 46.4, 50.8, 51.3 and 54.2 percent were deposited. The differences in values between groups I and IV were significant in both cases (P0,05). Pigs in experimental groups I to IV deposited 104.2, 119.4, 128.8 and 143.7 g of crude protein daily, the difference between values in groups I and IV was significant (P0,05). All pigs ingested on average 18.3 MJ of metabolizable energy per animal per day. The obtained results give evidence for the ability of pigs of the genotype employed to deposit a comparatively large amount of protein daily although the crude protein and lysine intake did not reach the maximum level of retention in the body. An increased ingestion of lysine positively affected not only the level of the protein deposit, but digestibility as well
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