[The effect of the raw protein supply on the lysine requirements of young pigs of 12-40 kg]. / Untersuchugen zum Einflubeta der Rohproteinversorgung im Lebendmasseabschnitt 12 bis 40 kg auf den Lysinbedarf der jungen Schweine

3 N balance trials were carried out with pigs weighing 12-40 kgs to test values for the lysine requirements of pigs that had been obtained in feeding trials with rations containing varying levels of crude protein. The present trials used rations containing 17%, 15% and 13% crude protein; the corresponding lysine percentages were 0.89, 0,79 and 0.62. The N balances revealed significant differences between the three crude protein levels amounting to 1.50 g, 1.36 g and 1.05 g per kg liveweight 0,67.

[The effect of the raw protein supply on the lysine requirements of young pigs of 12-40 kg. 1. Report. Feeding studies with wheat-peanut extraction residue rations]. / Untersuchugen zum Einflubeta der Rohproteinversorgung im Lebendmasseabschnitt 12 bis 40 kg auf den Lysinbedarf der jungen Schweine

10 feedings trials were carried out with a total of more than 500 pigs weighing 12 to 40 kgs. To investigate the lysine needs of growing pigs, the animals were fed rations of wheat + extracted ground nut meal. Different food mixtures were tested containing 5 levels of crude protein (19%, 17%, 15%, 13% and 11% of the dry feed. Within each crude protein level 6 graded lysine supplements were added to the ration. The trial showed that the lysine requirements of the weaned pigs were in a decisive measure determined by the percentage proportion of crude protein contained in the ration. The crude protein portion may be calculated (for the liveweight range tested) by using the following regression equation: y=0.28+0.075x (y=lysine requirements expressed as % of the air-dried ration; x=percentage proportion of crude protein in the ration). Rations containing only protein sources of vegetable origin, with a minimum protein content of 15%, produced the same daily weight gains (520 g) as a standard diet, if the lysine demands were met through the supplementation of synthetic lysine.

[Studies on the effect of raw protein supply on the lysine requirements in young pigs of living weight of 12-40 kg. 2. Report. Feeding studies with wheat-soy bean extraction residues]. / Untersuchungen zum Einflubeta der Rohproteinversorgung im Lebendmasseabschnitt 12 bis 40 kg auf den Lysinbedarf der jungen Schweine

A feeding trial was conducted on a total of 96 pigs to investigate the effect of lysine supplements added to rations of wheat+extracted soya bean meal and rations of wheat+extracted gound nut meal. Significant differences in the daily weight gains were noted (up to the 4th week of experiment) between the groups fed the soya bean meal ration and those fed the ground nut meal ration and between the soya bean meal groups receiving rations supplemented with 0,71% lysine or 0.79% lysine. At the termination of the trial (8th week) these differences were no longer significant statistically although the soya bean meal group fed rations supplemented with 0.79% lysine yielded clearly the best results.