The combined effects of dietary lysine and total sulfur amino acid level on egg production parameters and egg components in Dekalb Delta laying hens

Department of Animal Science, University of Nebraska, Lincoln, Nebraska 68583-0908, USA.

Dekalb Delta hens were randomly assigned to one of eight dietary treatment groups. Two intakes of lysine (860 and 959 mg/hen per day) and 4 intakes of TSAA (635, 689, 811, 877 mg/hen per day) were combined in a 2 x 4 factorial treatment arrangement and fed from 20 to 43 wks of age. A phase feeding regimen was implemented at 43 wk with lysine intake lowered to 715 or 816 mg/hen per day and TSAA to 578, 607, 699, or 779 mg/hen per day. Cage was the experimental unit (5 hens/cage), and dietary treatments were replicated 8 times. Egg production (EP) and feed consumption were not affected by dietary treatments. Feed efficiency improved linearly by increasing TSAA intake during phase I only. Hen weight gain was improved (P < or = 0.03) by increased dietary lysine (94.2 vs. 135.2 g weight gain/hen). During phase I, hen weight gain was affected quadratically (P < or = 0.02) by TSAA. Increasing TSAA intake up to 689 mg/hen per day increased hen weight gain, but gain decreased at the highest intake. Egg weights (EW) increased (P < or = 0.02) from 59.02 to 60.21 g with increased lysine intake. Increasing lysine intake increased wet and dry albumen percentage, whereas dry yolk percentage decreased with increasing lysine. Total sulfur amino acid intake affected wet yolk, dry yolk, and solids in a quadratic trend, with hens fed 811 and 699 mg/d producing eggs with the greatest yolk solids. Wet and dry shell percentages were not affected by lysine or TSAA, and specific gravity decreased linearly during phase II and overall, with increased dietary TSAA. In conclusion, the dietary lysine at 959 and 816 mg/hen per day for phases I and II, respectively, optimized EW and feed efficiency. Because EP was not affected by dietary lysine, the dietary level for optimizing EP is closer to 860 and 715 mg/hen per day for phases I and II, respectively. Dietary TSAA level for maximum EP and feed efficiency was near 811 and 699 mg/hen per day but for EW may be closer to 877 and 779 mg/hen per day for phases I and II, respectively.

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