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Feeding rumen-protected lysine prepartum and postpartum affected plasma metabolites and amino acids in Holstein cows.

L. K. Fehlberg

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06-24-2020

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Abstract:

W52
Feeding rumen-protected lysine prepartum and postpartum affected plasma metabolites and amino acids in Holstein cows.
L. K. Fehlberg*1, A. R. Guadagnin1, B. L. Thomas1, Y. Sugimoto2, I. Shinzato2, F. C. Cardoso1. 1University of Illinois Urbana, IL, 2Ajinomoto Co. Inc Tokyo, Japan.

During the periparturient period, the demand for protein increases drastically, resulting in a negative protein balance for dairy cows. This experiment was conducted to determine the effects of feeding rumen-protected Lys (RPL; AjiPro-L Generation 3, Ajinomoto Heartland Inc., Chicago, IL) prepartum (0.54%DM of TMR), postpartum (0.395%DM of TMR), or both on plasma AA and metabolites. Seventy-five multiparous Holstein cows, blocked by parity, previous 305-d mature-equivalent milk production, expected calving date, and body condition score during the far-off dry period were assigned to 1 of 4 dietary treatments in a randomized, complete block design with a crossover of a diet with RPL (L) or without (C). Treatments consisted of TMR topdressed with RPL prepartum and postpartum (LL), with RPL prepartum and without RPL postpartum (LC), without RPL prepartum and with RPL postpartum (CL), and without RPL prepartum and postpartum (CC). Blood samples were collected for plasma AA analyses on −7 � 0.5, 0 � 0.5, 7 � 0.9, and 14 � 0.9 d relative to calving (DRC). Blood samples were collected for plasma metabolites on −7 � 0.5, −1 � 0.6, 0 � 0.5, 7 � 0.9, 14 � 0.9, and 28 � 0.3 DRC. Statistical analysis was performed using MIXED procedure of SAS. Plasma concentrations of Lys prepartum (69.75�M) were increased (P < 0.001) for cows in L compared with C (62.46�M) at −7 DRC. Plasma concentrations of total AA and total dispensable AA prepartum were lower (P = 0.05) for cows in L (1810 and 1097 �M, respectively) than C (1924 and 1166 �M, respectively). Postpartum concentrations of Lys in plasma as a percentage of indispensable AA were greater (P < 0.001) for cows in L (10.52%) compared with C (9.65%). Plasma concentrations of glucose prepartum were greater (P = 0.05) at d 0 (calving) in cows in L (76.14mg/dL) compared with those in C (70.61mg/dL). Plasma concentrations of creatinine phosphokinase were lower (P = 0.04) for cows in L (118.0U/L) compared with those in C (131.2U/L) postpartum. In conclusion, cows consuming RPL prepartum increased glucose at calving and increased plasma Lys concentrations.

Keywords: lysine, glucose, transition period.