Leucine and valine requirements of the lactating sow

Valine Requirement for Reproduction in Swine

“…The comparison of postfeeding/fasting levels of plasma valine suggests that the lowest level of valine intake that will increase postfeeding concentration of plasma valine to fasting concen tration is close to 5.54g per day. This is further supported by Rousselow (1979) who stated that "... plasma amino acid concentration remains low until the requirement for that amino acid is met, after which, there is a sharp increase in its concentration "» thus again suggesting that a level of valine intake of 5.54g per day was required to reach the point of sharp increase for plasma valine concentration. 7 and table A20), both qualitative and quantitative, occurred when 7.81g of valine were fed.…”

“…The lactation requirement for some amino acids determined by the Iowa group were: 30 g per day for lysine (Lewis and Speer, 1973); 3.9 g per day for tryptophan (Lewis and Speer, 1974a); 23 g per day for threonine (Lewis and Speer, 1975b); 21 g per day for isoleucine (Naught and Speer, 1977); 25 g per day of leucine (Rousselow et £[., 1979) and 29 to 39 g per day for valine (Rousselow and Speer, 1980). In general these lactations studies were conducted during a 21 day lactation period.…”

The valine requirement for reproduction in swine

“…tration is close to 5.54g per day. This is further supported by Rousselow (1979) who stated that "... plasma amino acid concentration remains low until the requirement for that amino acid is met, after which, there is a sharp increase in its concentration "» thus again suggesting that a level of valine intake of 5.54g per day was required to reach the point of sharp increase for plasma valine concentration. 15.…”