Layer Performance Recovery After Feeding Amino Acid-deficient Diets

Lipid supplementation of laying hen diets deficient in protein and sulphur amino acids

Amino acid imbalance on low fibrin diets.

Young growing rats fed on a 9 per cent casein diet containing choline and supplemented with methionine and tryptophsn develop a partial deficiency of threonine which is characterized by the accumulation of fat in the liver (1, 2). The condition was shown to be due to an amino acid imbalance (3). Later, other proteins such as fibrin, egg albumin, and those of beef and pork were studied (4). With...

Aversion-preference patterns in amino acid- or protein-deficient rats: a comparison with previously reported responses to thiamin-deficient diets.

The purpose of the present experiments was to extend previous data on the strategy used by adult rats to select feed appropriately when faced with diets devoid of protein or an essential amino acid (EAA), and to compare this strategy with that used when facing vitamin (thiamin) deficiency. Rats fed on either balanced or deficient (EAA or protein) diets were offered a choice between a novel defi...

Growth performance, diet apparent digestibility, and plasma metabolite concentrations of barrows fed corn-soybean meal diets or low-protein, amino acid-supplemented diets at different feeding level.

Two experiments, each with 36 barrows with high-lean-gain potential, were conducted to evaluate apparent nutrient digestibilities and performance and plasma metabolites of pigs fed corn-soybean meal diets (CONTROL) and low-protein diets. The low-protein diets were supplemented with crystalline lysine, threonine, tryptophan, and methionine either on an ideal protein basis (IDEAL) or in a pattern...

Optimizing broiler performance using different amino acid density diets: What are the limits?

Broiler responses of economic interest, such as BW gain, FCR, and breast meat yield (BMY), can be optimized by increasing amino acid (AA) concentrations, improving the AA balance, or both. The AA requirements to maximize a response are lowest for BW gain, increased for FCR, and highest for BMY. A maximum performance response is reached when the response plateaus, whereas an optimal response is ...