[Effect of graded protein supply at high-energy level on the fattening performance and the retention and utilization of feed energy, protein and amino acids by female fattening swine. 3. N retention and N and lysine metabolism determined by N balance and N analysis of the carcasses].
The slaughtering of female fattening pigs differently supplied with protein and lysine (nearly constant proportions) showed that a high supply (III) in comparison to the standard supply (II) did not bring about better results. The lower consumption of digestible crude protein and lysine (I) resulted in a prolonged fattening period, lower daily protein retention (by 23%) and a lower content in live weight growth (by 5%). The two feeding variants I and III are therefore ineconomical and not recommendable. There are significant positive correlations between N-retention calculated from 3 N-balance measurings in the first fattening period (up to the 44th fattening day) and N-deposit ascertained after the analysis at the carcasses at the beginning and at the end of fattening. By means of the calculated estimate functions (1) y = 4.724 + 0.5432x and (2) y = 7.850 + 0.4961x the level of the real protein deposition (y) in the total fattening period can be derived from the N-balance (x) both in g per animal and day (1) and in g per kg live weight growth (2). The four complexes of causes for the differences in N-retention according to N-balance and N-deposit according to carcass analysis: 1. high N-deposition in the first fattening period; 2. unascertainable N-losses 3. the difference between slaughtering and total body weight and 4. physiologically caused deviations in the N-storage of the living organism, are discussed. Protein and lysine utilisations are comparable with values from literature achieved under similar conditions. In the group supplied according to standard (II) it is 29.5 and 45.6% resp. or, related to the digested quota, 36.6 and 57.7% resp. Here the protein (10.1 kg) and lysine (1,640 g) assigned for a live weight growth of 80 kg (35-115 kg) in 100 fattening days were consumed, which means that 162 g lysine were needed for 1 kg deposited protein.
D000003:Abattoirs; D000596:Amino Acids / Q000032:analysis; D000818:Animals; D001835:Body Weight; D004044:Dietary Proteins / Q000008:administration & dosage*; D004734:Energy Metabolism; D005260:Female; D008239:Lysine / Q000032:analysis / Q000378:metabolism*; D008460:Meat / Q000032:analysis; D009584:Nitrogen / Q000032:analysis / Q000378:metabolism*; D013552:Swine / Q000378:metabolism*
D000596:Amino Acids; D004044:Dietary Proteins; D008239:Lysine; D009584:Nitrogen
Einfluss einer abgesstuften Proteinversorgung bei hohem Energieniveau auf die Mastleistung sowie den Ansatz und die Verwertung von Futterenergie, Protein und Aminosäuren durch weibliche Mastschweine. 3. Mitteilung. Mittels N-Bilanz und Schlachtkörper-N-Analyse bestimmter N-Ansatz sowie N- und Lysin-Umsatz.