scholarly journals Observations on the Influence of Dietary Protein Level and Amino Acid Balance on Pigmentation in the Feathers of Chicks ,

1960 ◽  
Vol 39 (1) ◽  
pp. 25-29 ◽  
Author(s):  
G.J. Klain ◽  
D.C. Hill ◽  
Jean A. Gray ◽  
Ellen M. Olsen
Keyword(s):  
Amino Acid ◽  
Dietary Protein ◽  
Protein Level ◽  
Dietary Protein Level ◽  
Amino Acid Balance

THE EFFECT OF PROTEIN LEVEL AND AMINO ACID BALANCE UPON THYROID ACTIVITY IN THE CHICK

1964 ◽  
Vol 42 (3) ◽  
pp. 341-344 ◽  
Author(s):  
B. E. March ◽  
Jacob Biely ◽  
K. R. Pastro
Keyword(s):  
Amino Acid ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Dietary Protein ◽  
Protein Level ◽  
Thyroid Activity ◽  
Thyroid Glands ◽  
Amino Acid Imbalance ◽  
Methionine Supplementation ◽  
Amino Acid Balance

Chicks fed diets containing 26% of protein had larger thyroid glands than did chicks fed diets containing 17.5% of protein. Thyroidal uptake of I131 per chick was also greater in the chicks fed the higher level of protein. The basal diets were deficient in methionine. Supplementation of the diets with lysine, which would aggravate the amino acid imbalance, significantly depressed thyroidal uptake of I131 per chick. It is concluded that the amino acid composition of dietary protein, as well as the protein level in the diet, affects thyroid activity in the chick.

Effect of supplemental phytase and ideal dietary amino acid ratios in covered and hulless-barley-based diets on pig performance and excretion of phosphorus and nitrogen in manure

2001 ◽  
Vol 81 (1) ◽  
pp. 115-124 ◽  
Author(s):  
R. R. Grandhi
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Dietary Protein ◽  
Protein Level ◽  
Nitrogen Excretion ◽  
Free Access ◽  
Inorganic P ◽  
Hulless Barley ◽  
Dietary Protein Level ◽  
Dietary Amino Acid

A total of 144 (72 barrows + 72 gilts) crossbred pigs were used to determine the effect of feeding supplemental phytase and ideal dietary amino acid ratios in covered barley (CB) or hulless barley (HB)-based diets on growth performance, carcass quality, and excretion of phosphorus and nitrogen in manure during the grower and finisher periods. The three experimental grower and finisher diets were: 1) control diet (CB or HB) with Ca:P ratios according to National Research Counci l (NAS–NRC 1988), 2) the same as diet 1 but without added inorganic P, but supplemented with phytase (Novo Nordisk, Denmark) at 500 FTU kg–1, 3) the same as diet 2 with reduced dietary protein level, and supplemental amino acids lysine, threonine, and methionine to provide ideal dietary amino acid ratios of 0.70 for threonine to lysine and 0.30 for methionine to lysine. All diets were fed as pellets ad libitum in self-feeders with free access to drinking water. The ADG was not different (P > 0.10) between CB and HB or among the treatment diets during the grower, finisher and combined grower-finisher periods. The gain-to-feed ratios were higher (P < 0.01) for HB than for CB diets. They were also higher (P < 0.05) for diet 3 than for diet 1 during the finisher and combined grower-finisher periods. Carcass index and dressing percent were not different (P > 0.10) among the treatment diets. Supplemental phytase decreased (P < 0.05) the excretion of P during both grower and finisher periods. The combination of phytase and dietary ideal amino acid ratios decreased (P < 0.01) the excretion of both P and N. The ammonia and hydrogen sulphide production in stored liquid manure was not different among the diets 1, 2 and 3, and the urinary N excretion was closely related to ammonia production. These results indicate that replacing inorganic P with phytase and lowering the dietary protein level while supplementing amino acids in CB or HB diets can decrease the excretion of P up to 44.0% and N up to 28.0% in manure with no adverse effect on performanceof lean genotype pigs. Key words: Pigs, phytase, amino acids, phosphorus, nitrogen, excretion

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