## 1 Introduction  
China's demand for forage hay resources is growing rapidly, and the lack of quality roughage resources has become the primary factor limiting the rapid development of China's grass-fed livestock industry. According to statistics, in 2022, China imported a total of 1.94 \(\times\) 10\({}^{6}\)t of hay (General Administration of Customs of the People's Republic of China), and the number of imports is still increasing annually. With the shortage of quality roughage resources in China, amaranth can be used as a quality roughage for ruminants with good application prospects. Amaranth (_Amaranthus hypochondriacus_) is a high-quality annual forage crop with high yield, high quality, strong resistance, and fast growth and is an excellent forage grass for both food and feed. Generally, amaranth is moved once a year and yields up to 85 t fresh weight/ha and 17 t dry matter/ha at maturity [1]. Amaranth has high nutritional value, containing high crude protein (28% of dry matter), low levels of acid detergent lignin (4%of dry matter), and low concentrations of oxalate and nitrate, and can replace fish meal as a protein feed [2; 3]. In tropical and subtropical regions, _Amarant thus dubius_ can be used as an alternative raw material for feeding New Zealand white rabbits [4]. [PERSON] et al. [5] confirmed that amaranth (_Amaranthus hybridus_) leaf protein concentrate can be used as an alternative protein component to fishmeal in Nile tilapia (_Oreochromins niloticus_) aqufaeeds. The stems and leaves of amaranth are brittle and have a high moisture content, so it is important to process them soon after moving to avoid a large loss of nutrients and prevent amaranth from spoiling. Ensiling is an effective method for the safe preservation of amaranth, not only to improve the palatability of the feed but also to extend the storage time of high-moisture feeds. The replacement of corn silage with amaranth silage in fattening lamb diets (30% of dry matter) was feasible and increased the intake and average daily weight gain of fattening lambs [6]. However, fresh amaranth is difficult to use successfully in conventional silage due to its low dry matter and soluble carbohydrate content, low number of attached lactic acid bacteria, high buffer energy value, and high moisture content. Mixed silage is now a common and effective method to improve the feeding value of roughage. Suitable moisture content in the raw material is one of the important conditions to ensure the normal activity of lactic acid bacteria during silage, but high moisture can promote the growth of _Clostridium_, leading to spoilage of the silage [7]. Amaranth mixed with auxiliary materials with a high dry matter content can quickly reduce the moisture content in raw materials to meet the requirements for lactic acid bacteria fermentation, improve the fermentation quality of silage, and provide ruminants with a continuous and stable quality feed. [PERSON] et al. [3] studied the silage of two amaranth varieties and maize stover in five different combinations, and the amaranth mixed with maize stover silage was best, with higher crude protein content and dry matter digestibility and lower neutral detergent fiber content compared to maize stover silage. Wheat bran is a common agricultural byproduct with a high crude protein content and contains many vitamins, soluble carbohydrates, dietary fiber, and other nutrients, making it an important source of energy in ruminant farming. Wheat bran is a suitable supplement for high-moisture forage silage mixes, both to regulate the moisture content in the silage material and to improve the nutritional balance of the mixed silage material by increasing the soluble carbohydrate content. [PERSON] et al. [8] added 10% wheat bran to canola silage and showed that the addition of wheat bran increased the crude protein, metabolizable energy, and organic matter digestibility of canola silage.