Effects of feeding different levels of dietary corn silage on growth performance, rumen fermentation and bacterial community of post-weaning dairy calves

文献类型： 外文期刊

第一作者： Li, Lingyan

作者： Li, Lingyan;Qu, Jiachen;Zhu, Huan;Liu, Yuqin;Guan, Xianchao;Qu, Yongli;Li, Lingyan;Qu, Jiachen;Zhu, Huan;Liu, Yuqin;Guan, Xianchao;Qu, Yongli;Wu, Jianhao;Shao, Guang

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关键词： Corn Silage; Growth; Post-weaning Dairy Calves; Rumen Bacterial Community; Rumen Fermentation

期刊名称：ANIMAL BIOSCIENCE （ 影响因子：2.2； 五年影响因子：2.3 ）

ISSN： 2765-0189

年卷期： 2024 年 37 卷 2 期

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收录情况： SCI

摘要： Objective: The objective of this study was to evaluate the growth performance, rumen fermentation parameters and bacterial community of post-weaning dairy calves in response to five diets varying in corn silage (CS) inclusion. Methods: A total of forty Holstein weaned bull calves (80 +/- 3 days of age;128.2 +/- 5.03 kg at study initiation) were randomized into five groups (8 calves/group) with each receiving one of five dietary treatments offered as total mixed ration in a 123-d feeding study. Dietary treatments were control diet (CON; 0% CS dry matter [DM]); Treatment 1 (T1; 27.2% CS DM); Treatment 2 (T2; 46.5% CS DM); Treatment 3 (T3; 54.8% CS DM); and Treatment 4 (T4; 67.2% CS DM) with all diets balanced for similar protein and energy concentration. Results: Results showed that calves offered CS had greater average daily gain, body length and chest depth growth, meanwhile altered rumen fermentation indicated by decreased rumen acetate concentrations. Principal coordinate analysis showed the rumen bacterial community structure was affected by varying CS inclusion diets. Bacteroidetes and Firmicutes were the predominant bacterial phyla in the calf rumens across all treatments. At the genus level, the abundance of Bacteroidales_RF16_group was increased, whereas Unclassified_ Lachnospiraceae was decreased for calves fed CS. Furthermore, Spearman's correlation test between the rumen bacteria and rumen fermentation parameters indicated that Bacteroidales_ RF16_group and Unclassified Lachnospiraceae were positively correlated with propionate and acetate, respectively. Conclusion: The results of the current study suggested that diet CS inclusion was beneficial for post-weaning dairy calf growth, with 27.2% to 46.5% CS of diet DM recommended to achieve improved growth performance. Bacteroidales_RF16_group and Unclassified Lachnospiraceae play an important role in the rumen fermentation pattern for post-weaning calves fed CS.

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