New Products and Research

Effects of Added Synthetic Lysine on Second Cycle Commercial Leghorns While Maintaining the Methionine+Cysteine/Lysine Ratio at 0.75 Full Article

SUMMARY

Two experiments were conducted to determine the influence of synthetic lysine on performance and profits of commercial Leghorns while maintaining a 0.75 Met+Cys/Lys ratio in a corn-soy diet. In Experiment 1, a 3 × 4 factorial experiment with three protein levels (16.01, 14.86, and 14.42%) and four added synthetic lysine levels (0.000, 0.030, 0.059, and 0.088%) was conducted with Hy-line W-36 laying hens (n = 1440, 85 wk old) for 8 weeks. In Experiment 2, a 3 × 3 factorial experiment with three protein levels (14.87, 14.44, and 14.00%) and three added synthetic lysine levels (0.000, 0.030, and 0.059%) was conducted with Hy-line W-36 laying hens (n = 1080; 98 wk old) for 12 weeks. Results of Experiment 1 showed that there were no significant effect of adding synthetic lysine while maintaining a 0.75 Met+Cys/Lys ratio on egg production, egg mass, feed intake, feed conversion, egg specific gravity and final body weight. Results of Experiment 2 showed that the addition of synthetic lysine while maintaining a 0.75 Met+Cys/Lys ratio had significant effects on egg production, egg mass, feed intake, feed conversion, and egg specific gravity. In conclusion, when protein level of a corn-soy diet is below 15% (supplying less than approximately 15 g protein/h/d) or lysine intake is less than 720 mg/h/d, the addition of synthetic lysine while maintaining a 0.75 Met+Cys/Lys ratio can sign ificantly improve performance of laying hens. Although adding synthetic lysine to diets containing less than approximately 15% protein can improve performance and profits depending on value of performance improvements gained and cost of protein and lysine, these results give no indication as to whether or not diets containing less than 15% protein would be economical.

Key words: Hens, Synthetic lysine, Met+Cys/Lys ratio, Protein, Performance

Full Article 

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