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Effect of Feeding Budgeting Strategy on Carcase Characteristics of Finishing Pigs

15 March 2013

Over and under budgeting during finishing have minimal impact on net returns, but as additional efforts are made to minimize feed costs in the finishing phase, formulating early finishing diets slightly lower than the pigs’ physiological needs may offer an opportunity for feed savings, according to a study by H. L. Frobose, J. M. DeRouchey, D. Ryder, M. D. Tokach, S. S. Dritz, R. D. Good and, and J. L. Nelssen presented at the Kansas State Swine Day.

A total of 252 mixed-sex pigs (PIC 327 × 1050; initial BW = 79.8 ± 0.9 lb BW) were used in a 95-d growth study to compare feed-budgeting strategies and complete diet blending for finishing pigs on growth performance, carcass characteristics, and economics. Feed was delivered to all pens of pigs using a computerized feed delivery system (FeedPro, Feedlogic Corp., Willmar, MN) that is capable of delivering and dispensing 2 separate diets. Four experimental treatments had 9 pens/treatment and 7 pigs/pen in a randomized complete block design. Dietary treatments included: (1) standard 4-phase (0.91, 0.77, 0.67, and 0.61% standardized ileal digestible [SID] lysine, respectively) complete feed program (Standard), (2) blending a high- and low-lysine complete diet to meet the estimated daily SID lysine requirement from d 0 to d 95 (Curve), (3) Treatment 1 diets with 20% greater feed budget allowance per phase (Over), and (4) Treatment 1 diets with 20% lower feed budget allowance per phase (Under). Diets were corn-soybean meal–based with no added fat. The standard diet was budgeted at 117, 138, 158, and 175 lb for Phases 1 through 4, respectively.

Overall (d 0 to 95), no differences (P ? 0.11) were observed in ADG, ADFI, F/G, or final BW among pigs fed the budgeting strategy diets. Pigs phase-fed a standard phase-feeding program tended to have heavier (P = 0.09) HCW than pigs fed the Curve and tended to have (P = 0.10) greater percentage carcass yield than those fed the Curve or the Over diet. No differences (P ? 0.14) were observed in percentage lean, fat depth, or loin depth. Pigs fed diets blended to a lysine curve had lower feed costs (P < 0.004) than all three phase-feeding treatments, but because of heavier HCW, pigs fed the standard feed budget had greater (P = 0.05) revenue per pig and tended to have greater (P = 0.10) income over feed cost (IOFC) under two separate diet and carcass price scenarios compared with pigs fed with the Curve, with pigs over- and under-budgeted remaining intermediate. Over- and under-budgeting situations in phase feeding programs had minimal impact on growth performance, carcass characteristics, and net returns; furthermore, feeding blended diets to a lysine curve did not improve growth performance and led to lower total revenue than using a standard feed budget.

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January 2013

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