Duran A, Gabris J
Vet Med (Praha). 1982 Nov;27(11):657-64.
The cows with a higher production of milk had a lower content of free amino acids in their arterial blood (the difference was significant for lysine and phenyl alanine), as compared with the cows with a lower milk production level. Similarly, the high-performance cows had a higher content of free amino acids in their venous blood before milking (difference significant to highly significant for lysine, phenyl alanine, leucine, isoleucine, valine, cystine and alanine) and after milking (difference significant for lysine). Aspartic acid was the only amino acid contained at a higher amount in the blood of low-performance cows, the difference being partly significant after milking. The protein percentage was somewhat higher in the blood of less productive cows, particularly in venous blood before milking (insignificantly).
与产奶量较低的奶牛相比，产奶量较高的奶牛动脉血中游离氨基酸含量较低（赖氨酸和苯丙氨酸的差异显著）。同样，高产奶牛在挤奶前（赖氨酸、苯丙氨酸、亮氨酸、异亮氨酸、缬氨酸、胱氨酸和丙氨酸的差异显著至极显著）和挤奶后（赖氨酸差异显著）的静脉血中游离氨基酸含量较高。天冬氨酸是低产奶牛血液中唯一含量较高的氨基酸，挤奶后的差异部分显著。产奶量较低的奶牛血液中的蛋白质百分比略高，尤其是挤奶前的静脉血中（差异不显著）。
