ABSTRACT
Objective
Supplements of protein co-products, such as dried distillers grains with solubles
(DDGS), are often offered to lactating beef cattle consuming bermudagrass [Cynodon dactylon (L.) Pers.]. The quality of DDGS can vary greatly by source, including levels of
ADIN, which could influence hay intake and digestibility. The aim of the experiment
was to evaluate bermudagrass hay intake, digestibility, and in situ forage disappearance
for lactating beef cows consuming DDGS from different sources and ADIN levels.
Materials and Methods
Four 8-yr-old multiparous, ruminally cannulated lactating beef cows (535 ± 6.3 kg)
were offered each of 4 diets during 1 of the 4 periods in a 4 × 4 Latin square design.
Diets consisted of bermudagrass hay (17.7% CP) without supplement (CON) or with supplementation
with 0.45% of BW (DM basis) from either DDGS source 1 (DG1; 29.7% ADIN), DDGS source
2 (DG2; 31.2% ADIN), or DG2 that was heated (HDG2; 41.3% ADIN).
Results and Discussion
Hay and NDF intake (g/kg of BW) were greater (P = 0.04) from CON compared with DG1 and DG2; HDG2 did not differ from any treatment.
Ruminal ammonia concentrations were greater (P = 0.05) from DG1 and DG2 compared with the CON, and DG1 was greater than HDG2. However,
HDG2 did not differ from DG2 or CON. Ruminal acetate (P = 0.03) and butyrate (P = 0.01) had diet-by-time interactions, and propionate was less (P < 0.05) in CON compared with the other diets. The water-soluble fraction for bermudagrass
hay was greater (P = 0.05) from cows offered DG1 compared with DG2 and HDG2 but not different from that
of CON cows.
Implications and Applications
Different DDGS sources and ADIN of 41.3% of N did not affect total intake or digestibility
of bermudagrass for lactating beef cows.
Key words
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Article info
Publication history
Accepted:
April 5,
2022
Received:
September 28,
2021
Footnotes
The authors have not declared any conflicts of interest.
Identification
Copyright
© 2022 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
