Journal
ANIMAL PRODUCTION SCIENCE
Volume 59, Issue 3, Pages 524-530Publisher
CSIRO PUBLISHING
DOI: 10.1071/AN17245
Keywords
anti-nutritional factor; apparent total tract digestibility; barrows; kafirin; phenols; varieties
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Funding
- National Natural Science Foundation of China [31372316, 31772612]
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The present study was conducted to determine and compare the digestible (DE) and metabolisable energy (ME) and the apparent total tract digestibility (ATTD) of gross energy (GE) in yellow-dent corn, three low-tannin white sorghum cultivars and three high-tannin red sorghum cultivars when fed to growing pigs. Forty-two barrows (34.8 +/- 3.1 kg bodyweight) were housed in metabolic crates and allotted to one of seven diets with six pigs per diet in a completely randomised design. The seven diets were formulated to contain 969 g/kg of corn or one of the six sorghum cultivars as well as 31 g/kg vitamin and minerals. Faeces and urine were collected for 5 days following a 7-day adaptation period. The DE and ME were lower (P < 0.05) for red sorghum than for corn while the values for corn were lower (P < 0.05) than those obtained for white sorghum. The ATTD of GE for pigs fed corn was higher (P < 0.05) than for pigs fed red sorghum but was lower (P < 0.05) than the ATTD of GE for pigs fed white sorghum. Tannin had a high negative correlation with DE and ME (both, r = -0.99; P < 0.01) and the ATTD of GE (r = -0.92; P < 0.01). The DE, ME and ATTD of GE were positively correlated with CP (P < 0.05), and negatively with kafirin/CP and phenols (P < 0.05). However, tannin was negatively correlated with CP (r = -0.85; P < 0.05), or positively with kafirin/CP (r = 0.88; P < 0.01) and phenols (r = 0.77; P < 0.05). Therefore, tannin content in sorghum may be the main anti-nutritional factor. The overall results of this study indicate that low-tannin white sorghum varieties are superior to high-tannin red sorghum varieties for use as an energy source in diets fed to growing pigs, and high-tannin red sorghum varieties should be incorporated into pig diets to ease the demand pressure on corn only if favourably priced in terms of their DE and ME values.
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