Lysine and sulfur amino acid requirements of broiler chicks over short time periods within the starter phase.

AbstractEvolution can occur both gradually and through alternating episodes of stasis and rapid changes. However, the prevalence and magnitude of fluctuations of the rate of evolution remains obscure. Detecting a rapid burst of changes requires a detailed record of past evolution, so that events that occurred within a short time interval can be identified. Here, we use the phylogenies of the Baikal Lake amphipods and of Catarrhini, which contain very short internal edges facilitating this task. We detect 6 radical bursts of evolution of individual proteins during such short time periods, each involving between 6 and 38 amino acid substitutions. These bursts were extremely unlikely to have occurred neutrally, and were apparently caused by positive selection. On average, in the course of a time interval required for one synonymous substitution per site, a protein undergoes a strong burst of rapid evolution with probability at least ~0.01.

Download Full-text

Sulfur amino acid requirements for the maintenance and growth of juvenile rain

Reproduction Nutrition Development ◽

10.1051/rnd:19950538 ◽

1995 ◽

Vol 35 (5) ◽

pp. 603-604 ◽

Cited By ~ 7

Author(s):

M. Mambrini ◽

L. Seudre

Keyword(s):

Amino Acid ◽

Sulfur Amino Acid ◽

Amino Acid Requirements

Download Full-text

Parenteral sulfur amino acid requirements in septic infants

The FASEB Journal ◽

10.1096/fasebj.21.6.a1072-c ◽

2007 ◽

Vol 21 (6) ◽

Author(s):

Jama Sy ◽

William Gordon ◽

Debra Griffin ◽

Larry S Jefferson ◽

Robert A. Krance ◽

...

Keyword(s):

Amino Acid ◽

Sulfur Amino Acid ◽

Amino Acid Requirements

Download Full-text

Bursts of amino acid replacements in protein evolution

Royal Society Open Science ◽

10.1098/rsos.181095 ◽

2019 ◽

Vol 6 (3) ◽

pp. 181095

Author(s):

Anastasia V. Stolyarova ◽

Georgii A. Bazykin ◽

Tatyana V. Neretina ◽

Alexey S. Kondrashov

Keyword(s):

Amino Acid ◽

Rapid Evolution ◽

Synonymous Substitution ◽

Time Interval ◽

Short Time Interval ◽

Baikal Lake ◽

Rapid Changes ◽

Time Periods ◽

Short Time ◽

Detailed Record

Evolution can occur both gradually and through alternating episodes of stasis and rapid changes. However, the prevalence and magnitude of fluctuations of the rate of evolution remain obscure. Detecting a rapid burst of changes requires a detailed record of past evolution, so that events that occurred within a short time interval can be identified. Here, we use the phylogenies of the Baikal Lake amphipods and of Catarrhini, which contain very short internal edges which make this task feasible. We detect six salient bursts of evolution of individual proteins during such short time periods, each involving between six and 38 amino acid substitutions. These bursts were extremely unlikely to have occurred neutrally, and were apparently caused by positive selection. On average, in the course of a time interval required for one synonymous substitution per site, a protein undergoes a strong burst of rapid evolution with probability at least approximately 0.01.

Download Full-text

PERFORMANCE OF BROILER CHICKENS SUBJECTED TO WEEKLY CHANGES IN DIET COMPOSITION BASED ON PREDICTED AMINO ACID REQUIREMENTS

Canadian Journal of Animal Science ◽

10.4141/cjas81-121 ◽

1981 ◽

Vol 61 (4) ◽

pp. 983-988 ◽

Cited By ~ 1

Author(s):

MARY LOU FISHER ◽

S. LEESON ◽

J. D. SUMMERS ◽

K. SCHAEFER

Keyword(s):

Body Weight ◽

Amino Acid ◽

National Research Council ◽

Broiler Chicks ◽

Feed Conversion ◽

Feed Cost ◽

Significant Difference ◽

Amino Acid Requirements ◽

Model Treatment ◽

Bird Weight

A 7-wk floor trial experiment was conducted with male broiler chicks to investigate the use of a model equation to predict amino acid requirements. Chicks were fed two least-cost diet treatments based on (1) the National Research Council (NRC 1977) and (2) model-calculated amino acid recommendations. The dietary treatment based on model-calculated amino acid requirements supported a significantly (P < 0.01) better bird weight at 7 and 14 days. No significant difference (P > 0.05) in body weight was noted between treatments for the remainder of the growing period. A similar trend was noted for feed conversion, as the model treatment supported significantly better ratios (P < 0.01) from 0 to 7 and from 8 to 14 days of age. No significant differences (P > 0.05) in conformation, fleshing, breast or back finish were noted between birds of the two treatments. A cost analysis is presented; on the basis of feed cost per bird the model treatment was significantly (P < 0.01) superior to the NRC treatment for producing birds of a similar body weight in 49 days. However, no significant difference (P > 0.05) was noted between the two treatments on the basis of feed cost per kilogram of bird weight. These results indicate the potential of using model-predicted amino acid values as a basis for diet formulation.

Download Full-text