Wheat silage partially replacing oaten hay exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs

IF 6.3

Animal Nutrition Pub Date : 2023-09-19 DOI:10.1016/j.aninu.2023.08.010

Zhao-Yang Cui, Wen-Juan Li, Wei-Kang Wang, Qi-Chao Wu, Yao-Wen Jiang, Ailiyasi Aisikaer, Fan Zhang, He-Wei Chen, Hong-Jian Yang

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Abstract

This study aimed to investigate the feeding effect of wheat silage on growth performance, nutrient digestibility, rumen fermentation, and microbiota composition in feedlot lambs. Sixty-four male crossbred Chinese Han lambs (BW = 27.8 ± 0.67 kg, 3 months of age) were randomly assigned to four ration groups with wheat silage replacing 0% (WS0), 36% (WS36), 64% (WS64), and 100% (WS100) of oaten hay on forage dry matter basis. The concentrate-to-forage ratio was 80:20 and the feeding trial lasted 52 d. Increasing wheat silage inclusion linearly decreased dry matter intake by 4% to 27% (P < 0.01). However, increasing the wheat silage replacement of oaten hay by no more than 64% improved the feed efficiency by 14% as noted by the feed-to-gain ratio (P = 0.04). Apparent digestibility of organic matter (P < 0.01), neutral detergent fibre (P = 0.04) and acid detergent fibre (P < 0.01) quadratically increased. Ammonia nitrogen (P = 0.01) decreased while microbial protein production (P < 0.01) increased with the increase of wheat silage inclusion. Total volatile fatty acids concentration increased quadratically with the increase of wheat silage inclusion (P < 0.01), and the highest occurred in WS64. The molar proportion of acetate (P < 0.01) and acetate-to-propionate ratio (P = 0.04) decreased while butyrate (P < 0.01) and isovalerate (P = 0.04) increased. Increasing wheat silage inclusion increased the Firmicutes-to-Bacteroidota ratio by 226% to 357%, resulting in Firmicutes instead of Bacteroidota being the most abundant phylum. The relative abundance of cellulolytic Ruminococcus numerically increased but that of amylolytic Prevotella (P < 0.01) decreased as increasing wheat silage inclusion. Taken together, increasing wheat silage replacement of oaten hay by no more than 64% exhibited greater feed efficiency and fibre digestion despite low feed intake by feedlot lambs due to the change of Firmicutes-to-Bacteroidota ratio in the rumen.

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小麦青贮部分替代燕麦干草，在羔羊采食量较低的情况下，表现出较高的饲料效率和纤维消化能力

本试验旨在研究小麦青贮对饲用羔羊生长性能、营养物质消化率、瘤胃发酵及微生物群组成的影响。选用64只3月龄、体重= 27.8±0.67 kg的杂交汉代公羊，随机分为4个日粮组，分别以小麦青贮替代0% (WS0)、36% (WS36)、64% (WS64)和100% (WS100)的燕麦干草。精粗比为80:20，试验期52 d。增加小麦青贮包埋量可使干物质采食量线性降低4% ~ 27% (P <0.01)。小麦青贮替代燕麦干草不超过64%，料重比提高饲料效率14% (P = 0.04)。有机质表观消化率(P <0.01)，中性洗涤纤维(P = 0.04)，酸性洗涤纤维(P <0.01)呈二次增长。氨氮(P = 0.01)降低，微生物蛋白产量(P <0.01)随着小麦青贮包埋量的增加而增加。总挥发性脂肪酸浓度随小麦青贮包合量的增加呈二次曲线增加(P <0.01)，以WS64最高。醋酸盐的摩尔比(P <0.01)和乙酸丙酸比(P = 0.04)降低，丁酸比(P <0.01)和异戊酸(P = 0.04)升高。增加小麦青贮包涵量可使厚壁菌门与拟杆菌门的比值提高226% ~ 357%，从而使厚壁菌门取代拟杆菌门成为最丰富的门。分解纤维素的瘤胃球菌的相对丰度呈上升趋势，而分解淀粉的普氏菌的相对丰度呈上升趋势(P <0.01)，随青贮添加量的增加而降低。综上所述，尽管由于瘤胃中厚壁菌与拟杆菌比的变化导致采食量降低，但增加小麦青贮替代燕麦干草不超过64%，饲料效率和纤维消化能力均有所提高。

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来源期刊

Animal Nutrition Animal Science and Zoology

CiteScore

9.70

自引率

0.00%

发文量

542

审稿时长

65 days

期刊介绍： Animal Nutrition encompasses the full gamut of animal nutritional sciences and reviews including, but not limited to, fundamental aspects of animal nutrition such as nutritional requirements, metabolic studies, body composition, energetics, immunology, neuroscience, microbiology, genetics and molecular and cell biology related to primarily to the nutrition of farm animals and aquatic species. More applied aspects of animal nutrition, such as the evaluation of novel ingredients, feed additives and feed safety will also be considered but it is expected that such studies will have a strong nutritional focus. Animal Nutrition is indexed in SCIE, PubMed Central, Scopus, DOAJ, etc.