Abomasal Lysine Infusion in Steers Fed a Urea Supplemented Diet

Effect of ruminal ammonia supply on lysine utilization by growing steers1

“…The difference between studies is not extremely large and both values can be interpreted to suggest an inefficient utilization of Lys by growing cattle. Burris et al (1976) also observed that Lys utilization was inefficiently used for protein deposition, and an efficiency of 13% for growing steers fed a cornbased diet can be calculated from that work. This lower value by Burris et al (1976) may have resulted from the experimental conditions in that study.…”

“…Burris et al (1976) also observed that Lys utilization was inefficiently used for protein deposition, and an efficiency of 13% for growing steers fed a cornbased diet can be calculated from that work. This lower value by Burris et al (1976) may have resulted from the experimental conditions in that study. In the work of Burris et al (1976), it is not certain that the cattle were limited by only Lys; if other AA were limiting, the response to supplemental Lys may have been incomplete.…”

“…This lower value by Burris et al (1976) may have resulted from the experimental conditions in that study. In the work of Burris et al (1976), it is not certain that the cattle were limited by only Lys; if other AA were limiting, the response to supplemental Lys may have been incomplete.…”

“…Lysine is the second-limiting AA in ruminal microbial protein for growth of cattle (Richardson and Hatfield, 1978), and it can be the first-limiting AA when corn-based diets are fed (Burris et al, 1976;Abe et al, 1997). Lysine is subject to hepatic catabolism even when it is supplied in deficient amounts (Ball et al, 2007), which may contribute to inefficient utilization of Lys for protein deposition.…”

Amino acid needs of lactating dairy cows: Predicting limiting amino acids in contemporary rations fed to high producing dairy cattle in California using metabolic models

“…Researchers and nutritionists differ on which AA are limiting for milk production in dairy cattle, but studies have suggested lysine and methionine to be the most likely candidates (Burris et al, 1976;Schwab et al, 1976Schwab et al, , 1982 followed by phenylalanine, isoleucine, threonine (Derrig et al, 1974;Vik-Mo et al, 1974;Nichols et al, 1998;Piepenbrink and Schingoethe, 1998;Liu et al, 2000) histidine and arginine (Vanhatalo et al, 1999). Balancing diets for MP is difficult using current metabolic models due to a lack of accurate predictability of intestinally absorbable AA needs and delivery.…”