ABSTRACT
The dairy industry demand for rumen-protected methionine (RP-Met) supplements has
been competitive because of the constant emergence of new products. To evaluate performances,
our study was designed to characterize the production response of 3 RP-Met supplements
in mid-lactation dairy cows. Twelve multiparous Holstein cows were used in a replicated
4 × 4 Latin square design with 21-d treatment period. Treatments included control
[(basal) diet based on corn silage and alfalfa haylage, supplemented with 0.025% of
ration DM of lysine (Lys; Ajipro)] or 1 of 3 RP-Met supplements [Smartamine M (SMM),
Mepron M85 (MM85), or Novimet (NVM)]. For RP-Met groups, Met and Lys were supplemented
to the basal diet at 0.03 and 0.20% of ration DM, respectively. Treatments had no
effect on DMI or milk yield. Treatment did not modify milk fat or lactose concentration;
however, milk protein content was elevated with SMM, relative to control or NVM (3.30%
vs. 3.24 or 3.24%, respectively; P < 0.05). Milk fat, protein, and lactose yield were not modified by treatments. Treatments
tended (P = 0.12) to affect milk urea nitrogen. Serum Met concentration increased for SMM compared
with control, MM85, or NVM (27.3 μM vs. 21.2, 23.3, or 22.7 μM, respectively; P < 0.001). Similarly, supplementation of SMM reduced the serum Lys:Met ratio (4.5:1)
compared with control (5.2:1), MM85 (5.1:1), or NVM (5.2:1) (P < 0.05). Treatment did not modify the serum levels of all other EAA. We conclude
that SMM increased circulating Met and milk protein content more effectively than
NVM or MM85.
Key words
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Article info
Publication history
Accepted:
August 9,
2017
Received:
May 15,
2017
Footnotes
The authors declare no conflict of interest.
Identification
Copyright
Copyright © 2017, American Registry of Professional Animal Scientists. All rights reserved.
