Feeding rumen-protected lysine prepartum increases energy-corrected milk and milk component yields in Holstein cows during early lactation

Abstract

kg/d, respectively). Plasma concentrations of Lys prepartum (69.8 ± 1.8 µM) increased for cows in PRE-L compared with those in PRE-C (62.5 ± 1.3 µM). In conclusion, RPL consumed prepartum tended to increase postpartum DMI and increased energy-corrected milk and milk component yields. This indicates that prepartum supply of intestinally available Lys is pertinent to postpartum performance. However, postpartum supply of intestinally available Lys had no effect on cows' performance.

Acremonium terricola Culture’s Dose–Response Effects on Lactational Performance, Antioxidant Capacity, and Ruminal Characteristics in Holstein Dairy Cows

“…Thus, the unchanged N-NH 3 concentration in the rumen indicated that extra N intake from ATC supplementation contributed to microbial protein synthesis, rather than N-NH 3 production. Many studies have demonstrated that the supply of intestinally available limiting AA is pertinent to milk yield and milk protein yield by decreasing protein mobilization and increasing accretion [ 57 , 58 ]. According to the AA profile of ATC, TAA accounted for 17.27% of ATC (DM basis).…”

Validation of 2 urine pH measuring techniques in a prepartum negative dietary cation-anion difference diet and the relationship with production performance

“…All experimental procedures were approved by the University of Illinois (Urbana-Champaign) Institutional Animal Care and Use Committee (#18157) and were a part of a larger study (Fehlberg et al, 2020). A detailed description of this study is provided in Fehlberg et al (2020). Briefly, the experimental period was from September 2018 to June 2019.…”

“…Due to variation in actual calving day, not all cows had urine collected for wk −3 or −4. The number of cows per treatment was calculated to detect a minimum of 7% difference in postpartum DMI between groups, assuming a power of 0.9 and a 2-tailed α of 0.05 (Fehlberg et al, 2020). Cows were manually stimulated until urination, and approximately 80 mL of voided urine was collected via free-catch into a 100-mL urine collection tube (Fisher Scientific) during mid-stream of urination.…”

“…All cows had free access to water. Milking procedures were explained in detail elsewhere (Fehlberg et al, 2020). Briefly, cows were milked 2 × per day and weights were recorded at each milking.…”

The crucial role of lysine in the hepatic metabolism of growing Holstein dairy heifers as revealed by LC-MS-based untargeted metabolomics

“…However, recent studies have revealed that Lys is also an important bioactive molecule that plays key roles in signaling pathways and metabolic regulation, including energy, glucose, and lipid metabolism ( Hu and Guo, 2020 ; Kong et al., 2020 ; Wu, 2009 ). For example, a study indicated that dietary Lys restriction could enhance milk fat accumulation in dairy cows ( Křížová et al., 2010 ), and prepartum supply of intestinally available Lys in Holstein cows could improve milk fat and energy-corrected milk yields ( Fehlberg et al., 2020 ). However, we speculate that Lys metabolism and functions in dairy cows are inferred from pre-ruminants, and adult ruminants are distinguished from pre-ruminants by rumen microbial fermentation ( Malmuthuge and Guan, 2017 ).…”