Unnawong Narirat, Suriyapha Chaichana, Chankaew Sompong, Rakvong Teppratan, Cherdthong Anusorn
Tropical Feed Resources Research and Development Center (TROFREC), Department of Animal Science, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
Department of Agronomy, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand.
Anim Biosci. 2024 Oct;37(10):1726-1737. doi: 10.5713/ab.23.0516. Epub 2024 May 7.
This study examined the effects of substituting winged bean tuber steam (WBTS) modified starches for cassava chips (CSC) in the concentrate diet on rumen fermentation, nutrient utilization, and blood metabolites in Thai-native beef cattle.
Four Thai-native bulls were assigned randomly as a 4×4 Latin square design, which represents the amount of CSC replaced with WBTS in the concentrate mixture diets at 0%, 10%, 20%, and 30%.
Increasing levels of WBTS replacement for CSC in the concentrate diets had a quadratic effect on total dry matter (DM) intake (p<0.05). Replacement of WBTS at 20% and 30% for CSC did not alter total DM intake compared to 0% WBTS, whereas 10% WBTS replacement could significantly increase total DM intake by 0.41 kg DM/d compared to the control group. In addition, neutral detergent fiber (NDF) digestibility showed a quadratic increase (p<0.05) when CSC was substituted at various levels of WBTS in the concentrate diet (p<0.05). Replacement of CSC with WBTS at 10% and 20% showed higher NDF digestibility when compared to 0% replacement. There was a quadratic increase in blood glucose at 4 h post-feeding, and the average blood glucose value was significantly lower (p<0.01) when substituting CSC with WBTS. Substituting WBTS for CSC at 10% in the concentrate diet showed the highest blood glucose concentration when compared to other treatments. Replacing CSC with WBTS at 10% and 20% shows a higher concentration of C3 than those of other treatments (0% or 30%). The nitrogen (N) intake increased linearly (p<0.05) when substituting WBTS for CSC at all levels in the diet. Additionally, N retention and the ratio of N retention to N intake increased (p<0.05) when substituting WBTS for CSC at 10%, 20%, and 30% compared to 0%. The gross energy intake (GEI), digestible energy intake (DEI), and energy efficiency (DEI/GEI) were quadratically increased when substituted with various levels of WBTS for CSC in the concentrate diet.
The findings indicate that substituting 10% of CSC in the concentrate diet with WBTS may be sufficient as an alternative feed resource for improving nutrient utilization and metabolic efficiency in beef cattle diets.
本研究探讨在泰国本地肉牛的精料日粮中用四棱豆块茎淀粉（WBTS）改性淀粉替代木薯片（CSC）对瘤胃发酵、养分利用和血液代谢物的影响。
将四头泰国本地公牛随机分配为4×4拉丁方设计，代表精料混合日粮中用WBTS替代CSC的量分别为0%、10%、20%和30%。
精料日粮中用WBTS替代CSC的水平增加对总干物质（DM）摄入量有二次效应（p<0.05）。与0%WBTS相比，用20%和30%的WBTS替代CSC不会改变总DM摄入量，而10%WBTS替代可使总DM摄入量比对照组显著增加0.41千克DM/天。此外，当在精料日粮中用不同水平的WBTS替代CSC时，中性洗涤纤维（NDF）消化率呈二次增加（p<0.05）。与0%替代相比，用10%和20%的WBTS替代CSC时NDF消化率更高。采食后4小时血糖呈二次增加，用WBTS替代CSC时平均血糖值显著更低（p<0.01）。与其他处理相比，在精料日粮中用10%的WBTS替代CSC时血糖浓度最高。用10%和20%的WBTS替代CSC时C3浓度高于其他处理（0%或30%）。当在日粮中用WBTS替代CSC的所有水平时，氮（N）摄入量呈线性增加（p<0.
