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Effects of corn particle size on nutrient utilization in pigs evaluated under optimal and heat stress conditions

Author:
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
Source:
Tropical animal health and production 2019 v.51 no.2 pp. 443-448
ISSN:
0049-4747
Subject:
Duroc, barrows, body weight, cages, corn, crude fiber, crude protein, digestibility, energy, experimental diets, grinding, heat stress, landraces, nutrient utilization, particle size
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.
Agid:
6296857