309
Effects of 30% dried distillers grains with solubles and 5% added fat prior to slaughter on growth performance and carcass characteristics of finishing pigs
A total of 1,258 pigs in two groups (initially 105.8 kg; PIC 337 (group 1) or 327 (group 2) × 1050) were used in a 20-d experiment to determine the interactive effects of 30% dried distillers grains with solubles (DDGS) and 5% added fat prior to slaughter on growth performance and carcass characteristics of finishing pigs. All pigs were fed a common diet with 30% DDGS until 20 d prior to slaughter. Then all pens were weighed and allotted to treatments with 20 replicate pens per treatment. Dietary treatments were arranged in a 2 × 2 factorial with 2 diet types (corn-soybean meal–based diet with or without 30% DDGS) and added fat (0 or 5%; group 1 = tallow; group 2 = choice white grease). There were no treatment × group interactions as the responses to dietary treatment were similar across groups, regardless of fat source or DDGS level. Overall, there were diet type × added fat interactions for ADG (P<0.10) and G:F (P<0.05) with pigs fed the diet containing 30% DDGS having greater ADG and G:F improvements when fat was added compared with those fed the corn-soybean meal–based diet without DDGS. Although diet type did not affect final BW, pigs fed the diet containing DDGS had decreased HCW (P<0.05), which was the result of decreased carcass yield (P<0.05). Adding 5% fat did not affect carcass yield. Jowl fat iodine value was increased by added fat (P<0.05) and feeding DDGS (P<0.05). In conclusion, adding 5% fat to finishing pig diets containing 30% DDGS approximately 20 d prior to slaughter improved ADG and G:F but did not overcome the reduction in carcass yield from feeding DDGS.
Diet type: |
30% DDGS |
No DDGS |
Probability, P <1 |
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Added fat, %: |
0 |
5 |
0 |
5 |
Diet × Fat |
Diet |
Fat |
ADG, kg |
0.93 |
1.01 |
0.99 |
1.01 |
0.05 |
0.06 |
0.01 |
ADFI, kg |
3.14 |
3.08 |
3.21 |
3.19 |
0.47 |
0.01 |
0.18 |
G:F |
0.297 |
0.328 |
0.308 |
0.317 |
0.01 |
0.90 |
0.01 |
Final BW, kg |
124.4 |
125.8 |
125.4 |
125.8 |
0.34 |
0.40 |
0.14 |
HCW, kg |
90.7 |
91.6 |
91.9 |
92.3 |
0.56 |
0.03 |
0.12 |
Carcass yield, % |
72.75 |
72.67 |
73.05 |
73.24 |
0.29 |
0.01 |
0.63 |
Jowl IV, g/100g |
73.02 |
73.48 |
71.49 |
72.28 |
0.42 |
0.01 |
0.01 |
1SEM for ADG, ADFI, G:F, Final BW, HCW, carcass yield, and jowl IV were 0.014, 0.029, 0.004, 0.75, 1.22, 0.55, 0.132, and 0.210, respectively. |
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Keywords: finishing pig, fiber, fat, withdrawal