ABSTRACT
Objective
The objectives of this study were (1) to determine the effects of 3 levels of a rumen-protected
Lys (RP-Lys) prototype on milk production in dairy cows fed a diet deficient in MP-Lys
and (2) to assess the effects of treatments using AMTS.Cattle.Professional (AMTS =
Agricultural Modeling and Training System; Groton, NY).
Materials and Methods
Ten multiparous, Holstein cows were used in a 5 × 10 Latin rectangle (rows = five
18-d periods, columns = 10 cows). Treatments were (1) control (0 g of RP-Lys), (2)
30 g of Lys supplemented from RP-Lys using Aji-Pro L (APL; Ajinomoto, Chicago, IL),
(3) 17.5 g of Lys supplemented from RP-Lys prototype (RPLL), (4) 21.8 g of Lys supplemented
from RP-Lys prototype (RPLM), and (5) 31.5 g of Lys supplemented from RP-Lys prototype
(RPLH). The basal diet was formulated with a MP-Lys balance of −16.5 g/d. Milk and
blood samples were analyzed for milk components and plasma AA concentrations. Treatments
were assessed for MP-Lys balance using actual chemical composition of feed ingredients,
DMI, and milk production using the AMTS.
Results and Discussion
Regression analysis revealed that RP-Lys prototype supplementation increased milk
and lactose yields linearly (P = 0.03 and 0.04). There was a trend for RP-Lys prototype to increase protein percent
quadratically (P = 0.07). Treatments did not affect plasma Lys concentrations. The retrospective evaluation
of treatments showed an MP-Lys balance of −17 g/d for control and −2, −7, and 8 g/d
for RPLL, RPLM, and RPLH treatments, respectively. Collectively, these results indicated
that the RP-Lys prototype delivered Lys to support milk production.
Implications and Applications
Results indicate that supplementation with an RP-Lys prototype increased milk production
in cows fed a diet deficient in RP-Lys. These results may benefit dairy cows fed corn-based
diets.
Key words
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Article info
Publication history
Accepted:
July 21,
2019
Received:
May 30,
2019
Footnotes
Three of the authors work for Balchem Corporation, which provided funding for this research. The other authors declare no conflict of interest.
Identification
Copyright
© 2019 American Registry of Professional Animal Scientists. Published by Elsevier Inc. All rights reserved.
