Total nutrient digestibility and small intestine starch digestion in Nellore and Nellore × Angus steers fed whole shelled corn-based diet with or without roughage

IF 1.8 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Livestock Science Pub Date : 2025-04-11 DOI:10.1016/j.livsci.2025.105699

Priscilla D. Teixeira , Aline C. Rodrigues , Daniel R. Casagrande , Erick D. Batista , José M. Oliveira , Ana C.O. Santos , Pedro V.R. Paulino , Marcio M. Ladeira

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引用次数: 0

Abstract

This study aimed to evaluate total nutrient digestibility, pancreatic α‐amylase, and the expression of maltase-glucoamylase (MGAM) and solute carrier family 5 member 1 (SLC5A1) in the small intestine in Nellore and Nellore × Angus steers fed whole shelled corn-based diet with or without inclusion of sugarcane bagasse as a roughage source. Sixteen Nellore and 16 Nellore × Angus steers with 353 ± 25.3 kg were allotted in a completely randomized design using a 2 × 2 factorial arrangement (2 breeds and 2 diets). The two experimental diets [dry matter (DM) basis] comprised: 800 g/kg of whole shelled corn and 200 g/kg of protein-mineral pellet (WSC) or 740 g/kg of whole shelled corn, 200 g/kg of protein-mineral pellet, and 60 g/kg of sugarcane bagasse (WSCB). The intake of DM and other dietary components were greater in steers fed WSCB than in steers fed WSC (P < 0.01). However, WSCB decreased the total tract digestibility of DM, organic matter, crude protein, neutral detergent fiber, and total digestible nutrients (P ≤ 0.01) and tended to decrease ether extract digestibility (P = 0.08). There were no effects of breed on DM intake, nutrient intake, or nutrient digestibility (P > 0.10). Feeding WSCB to steers increased fecal output as well as starch excretion in feces (P < 0.01), whereas it tended to decrease starch in feces when expressed as a percentage (P = 0.09). Steers fed WSCB had greater pancreatic α-amylase activity (P = 0.03) and tended to have greater MGAM (P = 0.09) expression. On the other hand, animals fed WSC had greater SLC5A1 (P = 0.03) expressions. In conclusion, WSC diet increased total nutrient digestibility. However, there was no effect of diet on total starch digestibility, but the inclusion of sugarcane bagasse may increase small intestine starch digestibility since it has greater pancreatic α-amylase activity and MGAM expression.

查看原文本刊更多论文

Nellore和Nellore × Angus阉牛饲粮中添加或不添加粗饲料的总营养物质消化率和小肠淀粉消化率

本研究旨在评估Nellore和Nellore × Angus肉牛在添加或不添加甘蔗渣的全壳玉米饲粮中营养物质的总消化率、胰腺α‐淀粉酶以及麦芽糖-葡萄糖淀粉酶（MGAM）和溶质载体家族5成员1 （SLC5A1）在小肠中的表达。试验采用2 × 2因子完全随机设计（2个品种，2种饲粮），选用16头Nellore和16头Nellore × Angus阉牛（体重353±25.3 kg）。两种试验饲粮[干物质（DM）基础]为：全脱壳玉米800 g/kg +蛋白矿物颗粒（WSC） 200 g/kg或全脱壳玉米740 g/kg +蛋白矿物颗粒200 g/kg +甘蔗渣60 g/kg。WSCB饲粮中DM和其他饲粮成分的摄入量高于WSC饲粮(P <；0.01)。但WSCB降低了DM、有机物、粗蛋白质、中性洗涤纤维和总可消化营养物质的全消化道消化率（P≤0.01），并有降低粗脂肪消化率的趋势（P = 0.08）。品种对DM摄取量、营养物质摄取量和营养物质消化率没有影响(P >；0.10)。饲喂牛蒡子增加了粪便排出量和粪便中淀粉的排出量(P <；0.01)，而以百分比表示有降低粪便淀粉含量的趋势（P = 0.09）。犊牛饲喂WSCB后，胰腺α-淀粉酶活性显著提高（P = 0.03）， MGAM表达显著提高（P = 0.09）。另一方面，饲喂WSC的动物SLC5A1表达量更高（P = 0.03）。综上所述，WSC日粮提高了总营养物质消化率。饲粮对总淀粉消化率没有影响，但由于甘蔗渣具有较高的胰腺α-淀粉酶活性和MGAM表达，可能会提高小肠淀粉消化率。

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来源期刊

Livestock Science 农林科学-奶制品与动物科学

CiteScore

4.30

自引率

5.60%

发文量

237

审稿时长

3 months

期刊介绍： Livestock Science promotes the sound development of the livestock sector by publishing original, peer-reviewed research and review articles covering all aspects of this broad field. The journal welcomes submissions on the avant-garde areas of animal genetics, breeding, growth, reproduction, nutrition, physiology, and behaviour in addition to genetic resources, welfare, ethics, health, management and production systems. The high-quality content of this journal reflects the truly international nature of this broad area of research.