Review: Nutrient requirements of the modern high-producing lactating sow, with an emphasis on amino acid requirements

Effect of nutrient intake in lactation on sow performance: determining the threonine requirement of the high-producing lactating sow.

Reproductive performance is steadily increasing within the pork industry; logically, amino acid requirements need to be redefined for sows producing larger litters. The objective of this study was to determine the threonine requirement of the high-producing lactating sow and to determine the effect of lysine on this requirement. A total of 419 PIC C-15 sows were assigned randomly to treatment w...

Aromatic amino acid requirement of the lactating sow.

Six mature Yorkshire X Landrace sows were randomly assigned to a 6 X 6 Latin-square experiment on d 5 of lactation to determine the total phenylalanine (Phe) and tyrosine (Tyr) requirement. A control diet of corn sugar, cornstarch, whey, L-glutamic acid, solka floc, soybean oil, amino acids, minerals and vitamins was supplemented with L-Phe to provide .30 (basal), .45, .60, .75, .90 and 1.05% t...

Comparative amino acid requirements.

It is proposed to look, not at absolute requirements, but rather at the optimum pattern of essential amino acids (EAA) needed and the optimum value for the ratio EAA:total useful crude protein supply (CP; Nx6.25) when the supply is adequate but not excessive. For monogastric mammals and poultry it is clearly of practical value to try to assess requirements in the diet’. However, results may var...

Amino acid requirements of the breeding sow: the dietary lysine requirement during pregnancy.

1. Four pregnant sows were used to study lysine requirements by means of the interpretation of values for plasma amino acid and blood urea. Diets containing graded levels of dietary lysine were fed at the rate of 1.82 kg/d. 2. Plasma lysine remained at a low level up to 6.4 g dietary lysine/kg (dry matter basis) and then increased sharply with further increases in lysine intake. 3. Blood urea l...

The amino acid requirements of adults: a review.