DefinePK

Abstract

ABSTRACT This study aimed to investigate the impact of microbial fermentation of crop by-product feed on the performance, rumen fermentation, and serum antioxidant properties of Simmental crossbred cattle. Forty healthy Simmental crossbred with similar body weights were randomly divided into two groups: the control group (CON) and the microbial fermentation crop by-product group (BEF), each group had 4 replicates, with 5 cows in each replicate. The experiment extended over a period of 90 days. Our results revealed that the average daily gain of Simmental crossbred cattle in the BEF group was significantly higher than that of the control group (P=0.043). Additionally, the feed-to-gain ratio was significantly reduced in the BEF group (P=0.014). The levels of acetic acid, volatile fatty acids, and acetic acid/propionic acid ratio in the BEF group were significantly higher compared to the control group (P<0.05), while the ammonia nitrogen content was significantly lower (P<0.001). Furthermore, serum total antioxidant capacity (T-AOC), total superoxide dismutase (SOD), and glutathione peroxidase (GSH-Px) levels were significantly higher in the BEF group compared to the control group (P<0.05), and the concentration of malondialdehyde (MDA) was significantly lower (P<0.001). In conclusion, the microbial fermentation of crop by-product feed resulted in improved growth performance, enhanced rumen fermentation, and elevated antioxidant levels in Simmental crossbred cattle. These findings underscore the potential benefits of employing microbial fermentation as a strategy to enhance Simmental crossbred cattle health and productivity.