ANSC 330 Lecture 11: ANSC 330 Lecture 11
Document Summary
Cystine is a non-essential amino acid in the diet but animals have a known requirement: not considered an essential amino acid because methionine can be converted to cystine. Tyrosine is a non-essential amino acid in the diet, but animals have a known requirement: phenylalanine can be converted to tyrosine. If balancing a diet for essential amino acids the diet should be balanced for phenylalaine and phenylalanine + trysosine. Theoretically none: more on why this is the case for ruminants later. Certain levels of production change this: some amino acids may become essential for ruminants at levels of production that are higher than normal, referred to as conditionally essential amino acids, high levels of milk production. Methionine tends to be first limiting: high levels of growth. Aa requirements are dedicated by the needs of the animal = what protein and how much of it the animal is trying to produce in the body.
