Abstract
A total of 288 pigs (PIC 327 × 1050, initially 109.3 lb BW) were used in an 81-d trial to determine the effects of diet form and fiber (from dried distillers grains with solubles [DDGS] and wheat middlings) withdrawal before harvest on growth performance of growing-finishing pigs. Treatments were arranged in a 2 × 3 factorial with the main effects of diet form and dietary fiber feeding regimen. The 2 diet forms were meal or pellet. The 3 fiber feeding regimens were (1) low dietary fiber (corn-soybean meal–based diets) from d 0 to 81, (2) high dietary fiber (30% DDGS and 19% wheat midds) from d 0 to 64 followed by low fiber from d 64 to 81 (fiber withdrawal), and (3) high dietary fiber from d 0 to 81.
Highlights
The inclusion of by-products as alternatives to corn and soybean meal in swine diets has greatly increased in recent years
A total of 288 pigs (PIC 327 × 1050, initially 109.3 lb BW) were used in an 81-d trial to determine the effects of diet form and fiber withdrawal before harvest on growth performance of growing-finishing pigs
Treatments were arranged in a 2 × 3 factorial with the main effects of diet form and dietary fiber feeding regimen
Summary
A total of 288 pigs (PIC 327 × 1050, initially 109.3 lb BW) were used in an 81-d trial to determine the effects of diet form and fiber (from dried distillers grains with solubles [DDGS] and wheat middlings) withdrawal before harvest on growth performance of growing-finishing pigs. Pigs fed low-fiber diets throughout the trial had improved (P < 0.02) F/G compared with pigs fed high-fiber diets throughout, and pigs on the withdrawal regimen were intermediate. Fiber regimen did not influence (P > 0.35) ADG for the overall trial; pigs fed low fiber throughout the trial had decreased (P < 0.001) ADFI and improved (P < 0.001) F/G compared with pigs fed the withdrawal regimen or pigs fed high fiber. Compared with pigs fed low-fiber diets throughout, feeding high-fiber diets increased ADFI and resulted in poorer F/G, regardless of withdrawal. Pelleting the diets improved ADG and F/G, but worsened belly fat IV, regardless of diet formulation; pelleting increased belly fat IV to a greater extent with the high-fiber diet containing DDGS and wheat midds than with the low fiber, corn-soybean meal diet
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