文献类型： 外文期刊

作者： Jia, Peng ¹ ; Tu, Yan ¹ ; Liu, Zhihao ³ ; Li, Fadi ² ; Yan, Tianhai ⁴ ; Ma, Shulin ⁵ ; Dong, Lifeng ¹ ; Diao, Qiyu ¹ ;

作者机构： 1.Chinese Acad Agr Sci, Inst Feed Res, Sino US Joint Lab Nutr & Metab Ruminant, Key Lab Feed Biotechnol,Minist Agr & Rural Affairs, Beijing 100081, Peoples R China

2.Lanzhou Univ, Coll Pastoral Agr Sci & Technol, Key Lab Grassland Livestock Ind Innovat, State Key Lab Grassland Agroecosyst,Minist Agr & R, Lanzhou 730020, Peoples R China

3.Henan Univ Sci & Technol, Coll Anim Sci & Technol, Luoyang 471003, Peoples R China

4.Agrifood & Biosci Inst, Hillsborough BT26 6DR, Down, North Ireland

5.Hebei Acad Agr & Forestry Sci, Inst Cereal & Oil Crops, Shijiazhuang 050000, Peoples R China

关键词： Bacillus subtilis; Dairy cow; Enteric methane emissions; Macleaya cordata extract; Nutrient digestion; Nutrient utilization

期刊名称：ANIMAL FEED SCIENCE AND TECHNOLOGY （ 影响因子：3.313； 五年影响因子：3.914 ）

ISSN： 0377-8401

年卷期： 2022 年 294 卷

页码：

收录情况： SCI

摘要： The objective of this experiment was to evaluate the effectiveness of Bacillus subtilis and Macleaya cordata extract on production performance, enteric methane emissions, nutrient digestion and utilization of dairy cows. Sixty healthy lactating Holstein dairy cows averaged (mean +/- SD) 145 +/- 12.5 of days in milk, 38.3 +/- 3.3 kg/d of milk production, and 2.5 +/- 0.9 in parity were used in the experiment. Cows were assigned to 1 of 3 treatments: (1) control diet (CON), (2) control diet plus Bacillus subtilis (BS) dosed at 50 g/head/d, (3) control diet plus Macleaya cordata extract (MCE) dosed at 450 mg/head/d. The entire experimental was 75 d in length, using GreenFeed system (C-Lock Inc.) measured enteric methane (CH4) and carbon dioxide (CO2) emissions for individual cows. Six cows from each treatment were randomly selected to measure nutrient digestion and utilization. Compared with CON, BS and MCE diets increased dry matter intake (DMI) by 14 % and 11 %, as well as milk yield (6.9 % and 4.7 %), milk fat yield, milk protein yield, and milk lactose yield (P <= 0.05). Furthermore, BS and MCE diets reduced (P <= 0.05) CH4 yield (g/kg center dot DMI) by 10 % and 9 % compared with CON, respectively. Based on fat-corrected milk (FCM) or energy-corrected milk (ECM) yield, CH4 intensity was also reduced (P <= 0.05) by 6.8 % and 5.3 % (g/kg center dot FCM), or 6.8 % and 5.3 % (g/kg center dot ECM), respectively. BS diet had greater (P <= 0.05) neutral detergent fiber (NDF) and acid detergent fiber (ADF) digestibility than CON and MCE diets. Compared with CON, BS and MCE diets both increased (P <= 0.05) digestible energy, metabolizable energy, digestible nitrogen (N), and retained N, whereas it reduced (P <= 0.05) CH4 energy as a percent of gross energy. Cows offered the BS had greater (P <= 0.05) energy and N digestibility, as well as retained N and it as a percent of N intake or digestible N, compared with CON and MCE. Results suggested that implementation of these dietary interventions had potential to improve animal productivity led to a decrease in enteric CH4 yield or intensity.