Digestible tryptophan-to-digestible lysine ratio in diets for laying hens of 42 to 58 weeks of age

Calderano, Arele Arlindo; Gomes, Paulo Cézar; Lelis, Guilherme Rodrigues; Donzele, Juarez Lopes; Barreto, Sergio Luiz de Toledo; Pastore, Silvana Marques; Pena, Sérgio de Miranda

doi:10.1590/s1519-99402016000200002

Cited by 2 publications

(1 citation statement)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tryptophan is a precursor of serotonin, a neurotransmitter which has been attributed the function of regulating appetite in birds (Calderano et al., ). The excess of dietary LNAA (Large neutral amino acids) such as Ile compete with Trp, causing a deficiency of this AA in the brain, therefore inhibiting the synthesis and liberation of serotonin resulting in a decreased feed intake (Peganova and Eder, ).…”

Section: Discussionmentioning

confidence: 99%

Optimal in‐feed amino acid ratio for broiler breeder hens based on deletion studies

Dorigam

Sakomura

Sarcinelli

et al. 2016

Animal Physiology Nutrition

View full text Add to dashboard Cite

An ideal amino acid ratio (IAAR) for breeder hens is needed for maximum nitrogen retention (NR) taking into account nitrogen deposition in body (ND ), feathers (ND ) and egg mass (NEM) to improve dietary protein efficiency. Thus, the aim of this study was to apply the deletion method to derive the IAAR for broiler breeder hens. The nitrogen balance trials were performed from 31 to 35 weeks and from 46 to 50 weeks. Twelve treatments with eight replicates and one hen per cage were used. A balanced diet (BD) was formulated to meet the requirement of all nutrients. The other diets were formulated diluting 55% of BD with corn starch and refilled with amino acids (AAs) and other ingredients, except the AA tested. Each trial lasted 25 days. Feather losses, egg production and egg weight were recorded daily, and the samples were stored to further determine NEM and nitrogen in feather losses (ND ). At the start and the end of each period, a group of birds were slaughtered to further determine ND and ND . The NR was calculated as the sum of ND , ND , ND , NEM and the nitrogen maintenance requirement (NMR). The deletion of valine greatly depressed the NR in peak production (31 to 35 weeks) while the deletion of the isoleucine greatly depressed the NR of the hens from 46 to 50 weeks of age. The percentual reduction in NR and the per cent of the AA to delete from the BD were used to calculate the AA requirement. The average IAAR was Lys 100, Met+Cys 86, Trp 23, Thr 80, Arg 113, Val 90, Ile 91, Leu 133, Phe+Tyr 108, Gly+Ser 94 and His 35. The IAAR was in line with the recommendation from the literature, validating deletion method with the advantages from a rapid and low-cost procedure.

show abstract

Section: Discussionmentioning

confidence: 99%

Optimal in‐feed amino acid ratio for broiler breeder hens based on deletion studies

Dorigam

Sakomura

Sarcinelli

et al. 2016

Animal Physiology Nutrition

View full text Add to dashboard Cite

show abstract

Immunomodulatory, behavioral, and nutritional response of tryptophan application on poultry

2021

View full text Add to dashboard Cite

Tryptophan is an essential amino acid for all animals that was discovered through casein hydrolysis. The use of tryptophan as feed additives has been attracting the attention of many nutritionists because it cannot be synthesized enough in an animal's body. Tryptophan or precursor to the vitamin niacin in the diet is important, and its supplementation for poultry is determined to improve the amino acid balance and promote the poultry's growth performance through enhancing appetite, feed efficiency, and protein synthesis. Moreover, poultry in different growth phases, breeding, and conditions require various amounts of tryptophan. In addition, supplemented tryptophan also improves the immune response or the immunomodulatory activity of poultry to various diseases through the kynurenine pathway, especially diseases in the bursa. Furthermore, tryptophan also has a strong relationship with lysine (the ideal tryptophan/lysine ratio) in improving growth performance. However, tryptophan deficiency could affect the behavioral responses (e.g. pecking behavior and poultry stress) because tryptophan serves as a precursor for the neurotransmitter serotonin and the pineal hormone melatonin in the diet. This paper tried to summarize all information about applying tryptophan in the diets and illustrate the roles of tryptophan in the poultry industry.

show abstract

Digestible tryptophan-to-digestible lysine ratio in diets for laying hens of 42 to 58 weeks of age

Cited by 2 publications

References 11 publications

Optimal in‐feed amino acid ratio for broiler breeder hens based on deletion studies

Optimal in‐feed amino acid ratio for broiler breeder hens based on deletion studies

Immunomodulatory, behavioral, and nutritional response of tryptophan application on poultry

Contact Info

Product

Resources

About