Effects of dried distillers grains with solubles and increasing dietary wheat middlings on growth performance, carcass characteristics, and fat quality in growing-finishing pigs

Date

2010-11-22

Journal Title

Journal ISSN

Volume Title

Publisher

Kansas State University. Agricultural Experiment Station and Cooperative Extension Service

Abstract

A total of 288 pigs (PIC TR4 × 1050, initially 100 lb) were used in an 84-d growth trial to evaluate the effects of dietary wheat middlings and dried distillers grain with solubles (DDGS) on growing-finishing pig growth performance, carcass characteristics, and carcass fat quality. Pens of pigs were balanced by initial weight and gender and were randomly allotted to 1 of 4 dietary treatments with 8 pigs per pen (4 barrows and 4 gilts) and 9 replications per treatment. Dietary treatments included a corn-soybean meal-based diet, a diet with 30% DDGS, or the diet with 30% DDGS with 10% or 20% wheat middlings. Treatment diets were formulated to constant standardized ileal digestible lysine:ME ratios within each phase. All treatments were fed in 4 phases. Overall (d 0 to 84), pigs fed increasing wheat middlings had decreased (linear; P ≤ 0.02) ADG and poorer (linear; P ≤ 0.01) F/G. There were no differences (P = 0.12) among treatments for ADFI. For carcass characteristics, increasing wheat middlings decreased (linear; P < 0.01) percentage yield and HCW and tended to decrease (linear; P < 0.06) loin depth. Pigs fed wheat middlings also had decreased (quadratic; P < 0.02) back fat and increased (quadratic; P < 0.01) percentage lean. Increasing DDGS from 0 to 30% decreased (P < 0.03) carcass yield and backfat depth (P < 0.01), while increasing percentage lean (P < 0.03) and jowl iodine value (P < 0.001). Increasing wheat middlings in the diet decreased (linear; P < 0.006) feed cost per pig and feed cost per lb gain but also decreased (linear; P < 0.008) total revenue. Similarly, feeding DDGS decreased (P < 0.001) feed cost per pig and feed cost per lb gain; however, because total revenue was not decreased as greatly by DDGS, feeding 30% DDGS increased (P < 0.001) income over feed costs (IOFC). In conclusion, alternative ingredients, such as DDGS and wheat middlings, can reduce feed cost; however, the full impact on growth performance and carcass value must be known to truly understand whether they influence net profitability.

Description

Keywords

Swine, Dried distillers grains with solubles, Iodine value, Wheat middlings

Citation

Collections