Supplemental material for "Lactational performance, rumen fermentation and enteric gas emissions of dairy cows fed an amylase-enabled corn silage in diets with different starch concentrations"

This study investigated the effects of feeding an amylase-enabled corn silage (ACS) on performance and enteric gas emissions in lactating dairy cows. Following a 2-wk covariate period, 48 mid-lactation Holstein cows were assigned to 1 of 3 treatments in a 10-wk randomized complete block design experiment. Treatments were diets containing the same proportion of corn silage (40% of dietary dry matter; DM): (1) control corn silage (CON), (2) ACS replacing the control silage; ADR), and (3) the ADR diet supplemented with ground corn grain to achieve the same dietary starch content as CON (ASR). Control corn silage and ACS contained 40.3 and 37.1% DM and (% of DM): neutral detergent fiber (NDF), 37.2 and 41.0; and starch, 37.1 and 30.0, respectively. Enteric gas emissions were measured using the GreenFeed system. When compared with CON, cows fed ADR had increased DM intake (DMI) during experimental wks 3,4 and 9, but treatment did not affect milk or energy corrected (ECM) milk yields. Compared with CON, overall feed efficiency (per unit of milk, but not ECM) was lower for ADR, whereas milk true protein content and yield were lower for ASR. Milk urea N was decreased by both ADR and ASR diets relative to CON. Compared with CON, daily CH4 emission and emission intensity were increased by ADR but not ASR. Total protozoal count was increased by both diets formulated with ACS when compared with control corn silage. Total-tract digestibility of dietary NDF (NDFD) was greater for ASR and that of acid-detergent fiber (ADFD) was greater for both ADR and ASR versus CON. Acetate and acetate to propionate ratio were increased by ADR, but not ASR, when compared with CON. Replacement of control with ACS (having lower starch content) in the diet of dairy cows increased DMI during the initial weeks of the experiment, maintained ECM, decreased feed efficiency, and increased enteric CH4 emissions , likely due to increased intake of digestible fiber, compared with the control silage.

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Work Title Supplemental material for "Lactational performance, rumen fermentation and enteric gas emissions of dairy cows fed an amylase-enabled corn silage in diets with different starch concentrations"
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Open Access
Creators
  1. Sergio Cueva Welchez
  2. D. E. Wasson
  3. L. F. Martins
  4. S. E. Räisänen
  5. T. Silvestre
  6. A. N. Hristrov
Keyword
  1. Corn silage
  2. Dietary starch
  3. Enteric methane
License In Copyright (Rights Reserved)
Work Type Other
Publisher
  1. Journal of Dairy Science
Publication Date 2023
Subject
  1. Ruminant Nutrition
Language
  1. English
Geographic Area
  1. United States
Deposited July 10, 2023

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    • corn silage, dietary starch, enteric methane
    • Corn silage, Dietary starch, Enteric methane
  • Added Creator D. E. Wasson
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  • Added Creator S. E. Räisänen
  • Added Creator T. Silvestre
  • Added Creator A. N. Hristrov
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    Work Title
    • Lactational performance, rumen fermentation and enteric gas emissions of dairy cows fed an amylase-enabled corn silage in diets with different starch concentrations
    • Supplemental material for "Lactational performance, rumen fermentation and enteric gas emissions of dairy cows fed an amylase-enabled corn silage in diets with different starch concentrations"
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