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Effect of alkaline mineral complex buffer addition on milk performance, blood parameters, and rumen microbiota in early-lactation dairy cows

文献类型： 外文期刊

作者： Zhou, Xiaoting;Guo, Cheng;Wang, Xiaowei;Kong, Fanlin;Li, Shengli

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关键词： early-lactation dairy cows;alkaline mineral complex buffer;rumen microbiota

期刊名称： MICROBIOLOGY SPECTRUM

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年卷期： 2025 年

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收录情况： 无来源刊（2025版）

摘要： This study evaluated the effects of an alkaline mineral complex buffer (AMCB) in the diet on lactation performance, blood parameters, rumen fermentation, and microbial composition in early-lactation Holstein cows. In total, 30 Holstein cows (average parity 3.76 +/- 0.48, milk in lactation day 22.45 +/- 0.51) were randomly assigned to a control group (CON) or an experimental group (EXP) receiving 50 mL AMCB daily, providing 10 g sodium metasilicate, 5 g potassium bicarbonate, 0.5 mg zinc oxide, and 0.05 mg Ge-132 per cow. Cows supplemented with AMCB exhibited higher dry matter intake, milk production, fat-corrected milk yield, and energy-corrected milk yield, as well as increased lactose and milk protein concentrations and daily yields (P < 0.05) compared to the CON group. Notably, there was a significant reduction in somatic cell counts in the milk (P < 0.05). AMCB supplementation also led to a decrease in serum levels of aspartate aminotransferase and alanine aminotransferase (P < 0.05), while increasing rumen ammonia nitrogen concentrations (P < 0.05). A trend toward greater bacterial richness (Chao1, P = 0.06) was observed, with significant increases in Prevotellaceae_UCG-001 and Ruminococcaceae_NK4A214_group by d 30 (P < 0.05), and Enterococcus identified as a biomarker in the EXP group. These findings underscore that AMCB supplementation enhances production performance in dairy cows, mitigates liver function impairment, and stimulates the proliferation of protein-degrading bacteria in the rumen. This highlights AMCB's potential as a strategic dietary intervention, offering valuable guidance for optimizing nutritional management to support both metabolic health and productivity for early-lactation cows.

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