Effects of corn particle size on nutrient utilization in pigs evaluated under optimal and heat stress conditions |
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Authors: | Yun Won Song Min Ho Lee Ji Hwan Lee Chang Hee Oh Seo Young Kwak Woo Gi Kim Doo Wan Kim Hyeun Bum Cho Jin Ho |
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Institution: | 1.Department of Animal Science, Chungbuk National University, Cheongju, Chungbuk, 28644, Republic of Korea ;2.Department of Animal Science and Biotechnology, Chungnam National University, Daejeon, 34134, Republic of Korea ;3.Swine Division, National Institute of Animal Science, Rural Development Administration, Cheonan, 31000, Republic of Korea ;4.Department of Animal Resource and Science, Dankook University, Cheonan, 31116, Republic of Korea ; |
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Abstract: | The effects of corn particle size on nutrient digestibility and energy utilization in pigs were determined under optimal (experiment 1, 25?±?1 °C) or heat stress (experiment 2, 37?±?1 °C) conditions. In Exp. 1 and 2, five experimental diets were tested using a 5?×?5 Latin square design involving five barrows (Landrace × Yorkshire × Duroc, average initial body weight of 30?±?1 kg and 45.0?±?1.8 kg, respectively, in individual metabolic cages). Dietary treatments were as follows: 200-, 300-, 400-, 600-, 800-μm corn particle sizes obtained by mesh screens. Under optimal thermal conditions, digestibility of dry matter (DM) and crude fiber (CF) from 200-μm diet was higher (P?<?0.05) compared to that from the 300-μm and 400-μm diets. The digestibility of crude protein (CP) and ether extract (EE) was the highest (P?<?0.05) at the 200-μm particle size. The apparent total tract digestibility of energy was significantly higher (P?<?0.05) on the 200-μm diet. Under heat stress, digestibility of CF when corn was ground to 600 μm was higher (P?<?0.05) compared to 300 and 400 μm. Digestibility of NDF and ADF was the highest (P?<?0.05) at 600-μm corn particle size. In conclusion, grinding corn to 200-μm corn particles had a positive effect on DM, CP, EE, and CF under optimal thermal condition, while the 600-μm corn particle size had positive effects on digestibility of CF, NDF, and ADF than 200-μm corn particle size under heat stress. |
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