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An updated meta-analysis of influences of animal, dietary, and operational factors on the effects of supplemental methionine on lactational performances in dairy cows

文献类型： 外文期刊

作者： Xiaowen Wang;Jianhua Wang;Peipei Li;Hui zeng Sun;Xiuli Li;Hengrui Zhan;Minjia He;Shiying Zhang;Dengpan Bu;Lianbin Xu

作者机构：

关键词： interfering factors;lactating cows;meta-analysis;methionine supplementation;milk production

期刊名称： Journal of Dairy Science

ISSN： 0022-0302

年卷期： 2025 年 108 卷 7 期

页码：

收录情况： SCIE（2025版）

摘要： Previous studies regarding the effects of supplemental Met on lactational performance in dairy cows are inconsistent, and the potential interfering factors need to be systematically investigated. The standardized mean difference (SMD) of continuous variables from 60 articles published by April 30, 2024, were pooled by random-effects models using Stata version 17. Results showed that Met supplementation increased ECM, milk protein content and yield, and milk fat content and yield (SMD = 0.15–0.53) with a moderate degree of heterogeneity (I2 = 39.1%–64.6%). Subgroup analyses revealed that responses of lactational performance to Met addition were affected by animal, dietary, and operational factors including parity, lactation stage, cow breed, basal diet type, and MP level, as well as type, dosage, and duration of supplementation. Regression analyses revealed that the associations between milk yield (r = 0.37), milk protein yield (r = 0.42), and milk fat yield (r = 0.33) with digestible Met intake were significant for MP-deficient diets, but not for the MP-adequate diets, and the optimal dosage and duration for rumen-protected Met addition were 13.2 to 16.4 g/d and 68 to 72 d, respectively. These findings provide practical guidelines for Met supplementation to improve the lactation performance in dairy cows.

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