Influence of maize particle size on the kinetics of starch digestion in the small intestine of growing pigs
N. O. Amaral A , L. G. M. Amaral B D , V. S. Cantarelli B , E. T. Fialho B , M. G. Zangeronimo C and P. B. Rodrigues BA Federal Institute of South of Minas Gerais - Campus Machado, Machado, Brazil.
B Department of Animal Sciences, Federal University of Lavras, Lavras, Brazil.
C Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil.
D Corresponding author. Email: leticia.morais03@gmail.com
Animal Production Science 55(10) 1250-1254 https://doi.org/10.1071/AN14050
Submitted: 29 January 2014 Accepted: 7 August 2014 Published: 31 October 2014
Abstract
The kinetics of starch digestion in the small intestine, nutrient utilisation and the performance of growing pigs that were fed diets containing maize of different particle sizes were evaluated. For the performance evaluation, 42 barrows and females (initial weight: 30.5 ± 1.78 kg) were used in a randomised block design with three treatments [maize with different geometric mean diameters (GMD) of 550, 700 and 850 μm] and seven replications. To evaluate the kinetics of starch digestion, one animal from each experimental trial was sacrificed. The small intestine was removed and separated into five equal parts. The starch digestibility in each segment was determined. To determine the total digestibility and nitrogen balance, 24 barrows (initial weight: 41.3 ± 4.72 kg) were housed in metabolism cages in a randomised block design with three treatments and eight repetitions. The animals that were fed diets containing maize of 550-μm GMD exhibited better (P = 0.008) feed conversion. However, the digestion of starch was gradual and variable among the degrees of grinding that were tested. There were higher (P = 0.008; 0.005 and 0.009) digestible energy, dry matter digestibility and nitrogen uptake in diets containing the maize ground to 550 and 700 μm in GMD. Thus, the smallest GMD of maize (550 μm) that was used in diets for growing pigs improves feed conversion. GMD of 550, 700 and 850 μm of maize were associated with rapid, intermediate and slow starch digestion, respectively.
Additional keywords: metabolism, nutrition.
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