ABSTRACT
Objective
We investigated the lactational performance and N utilization of dairy cows fed different
forms of Lys supplements with the main focus on Lys derivatives ofN-acetyl-l-Lys (NALL) during mid to late lactation.
Materials and Methods
Forty lactating Holstein dairy cows (151 ± 78.0 DIM) were assigned to 1 of 4 treatments
(n = 10) in a randomized complete block design. The 4 dietary treatments were as follows:
(1) TMR without Lys supplementation (control), (2) TMR withNε-acetyl-l-Lys supplementation at 51.5 g/d (εNALLT), (3) TMR withNα, ε-acetyl-l-Lys supplementation at 63 g/d (diNALLT), and (4) TMR with commercial rumen-protected
Lys (AjiPro-L, Ajinomoto Heartland Inc.) supplementation at 100 g/d (CRPLT).
Results and Discussion
Feeding of diNALLT and the CRPLT decreased DMI. Milk yield, component yield, and component
concentrations were not affected by Lys supplementation. In contrast, feed conversion
efficiency (milk yield/DMI) was greatest for diNALLT. The efficiencies of 3.5% FCM
yield/DMI and ECM yield/DMI did not differ among treatments. Feeding the diNALLT and
the CRPLT tended to reduce manure N excretion compared with the control and the εNALLT.
Overall, results from the current study suggest that supplementing a Lys derivative,
diNALL, to mid- to late-lactation dairy cows resulted in similar production performance
relative to a commercial rumen-protected Lys product.
Implications and Applications
A sizable increase in feed conversion efficiency (milk yield/DMI) and a trend for
a reduction in manure N excretion when cows were supplemented with diNALL resulted
from its effect to reduce DMI and N intake. This result indicates that the developmental
diNALL product is metabolically active in lactating dairy cows. Further investigation
is warranted to understand the biological availabilities of NALL in lactating dairy
cows.
Key words
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Article info
Publication history
Accepted:
December 9,
2021
Received:
August 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.
