Abomasal infusion of branched-chain amino acids or branched-chain keto-acids alter lactation performance and liver triglycerides in fresh cows

Table 2 Nutrient composition evaluation (NASEM 2021) of early lactation diet fed to multiparous Holstein fresh cows^a

^aPredicted by Nutrient Requirements of Dairy Cattle (v.8, The National Academies of Sciences, Engineering, and Medicine) [15] based on ingredient composition, with the observed mean DMI, BW, BW loss, milk yield, and milk components for each treatment
^bCON Control (saline 0.9%), BCA Branched chain amino acids (67 g valine, 50 g leucine, and 34 g isoleucine), BCK Branched chain keto-acids (77 g keto-valine, 57 g keto-leucine, and 39 g keto-isoleucine)
^cValues were predicted using the NASEM Dairy software V8 R2022.12.08 using actual milk production and diets for each treatment. BCAA were entered as RUP supplements with 100% digestibility. BCKA were entered as a FA supplement with 100% digestibility to provide the same DE supply as BCKA. For BCA treatment, values for NE and MP-allowable milk are dependent upon the cow description. Values in parentheses were predictions using the milk production of CON cows to predict milk without the complicating effects of user-entered milk on urinary N output

ISSN: 2049-1891