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Related Experiment Video

Updated: Feb 27, 2026

The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

The Use of an Automated System GreenFeed to Monitor Enteric Methane and Carbon Dioxide Emissions from Ruminant Animals

Published on: September 7, 2015

Reduced energy density of close-up diets decrease ruminal pH and increase concentration of volatile fatty acids

Wenming Huang^1,2, Yujia Tian¹, Shengli Li¹

¹State Key Laboratory of Animal Nutrition, College of Animal Science and Technology, China Agricultural University, Beijing, China.

Animal Science Journal = Nihon Chikusan Gakkaiho

|June 28, 2017

Summary

Reduced energy density diets for transition cows altered ruminal fermentation. Lower energy diets increased volatile fatty acids postpartum but heightened the risk of subacute ruminal acidosis.

Keywords:

bacterial population dietary energy density ruminal parameter transition cow

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Published on: November 30, 2018

Area of Science:

Animal Science
Ruminant Nutrition
Dairy Cattle Metabolism

Background:

Transition dairy cows require precise nutrition to manage metabolic challenges.
Dietary energy density significantly impacts ruminal function and health.
Understanding prepartum dietary effects on postpartum ruminal fermentation is crucial.

Purpose of the Study:

To investigate the impact of reduced energy density in prepartum diets on ruminal fermentation parameters in transition Holstein cows.
To assess the effects on dry matter intake, ruminal pH, volatile fatty acid (VFA) concentrations, and key microbial populations.

Main Methods:

Fourteen Holstein cows were assigned to high (HD), medium (MD), or low (LD) energy density diets prepartum and postpartum.
Ruminal fermentation parameters, including pH, VFA concentrations, and microbial populations (Butyrivibrio fibrisolvens, Ruminococcus flavefaciens), were analyzed.
Dry matter intake (DMI) was monitored prepartum and postpartum.

Main Results:

Reduced energy density diets decreased prepartum DMI and tended to increase postpartum DMI.
The LD group exhibited higher ruminal pH prepartum and lower pH during early lactation.
Prepartum propionate and butyrate concentrations were depressed by lower energy diets, while total VFA increased postpartum.
Increased populations of Butyrivibrio fibrisolvens and Ruminococcus flavefaciens were observed in the LD group at 7 days in milk.

Conclusions:

Feeding reduced energy density diets prepartum influences ruminal fermentation dynamics in transition cows.
While postpartum VFA concentrations were higher, the LD group showed increased susceptibility to subacute ruminal acidosis.
Dietary energy manipulation requires careful consideration to balance fermentation benefits and acidosis risks.