Sex-related Differences in Skeletal Muscle Amino Acid Concentrations in 20 Week Old Turkeys

Abstract

Sexual dimorphism of growth and development of organs and tissues in poultry species results from differentiated endocrine system and metabolic processes rate, and leads to difference of skeletal muscles mass and final body weight. Our knowledge on physiological variation in free amino acid status of skeletal muscles in meat-type turkeys is strongly limited. The aim of the study was to determine sex-related differences of free amino acid concentration in breast muscles obtained from turkeys at the age of 20 weeks. The experiment was performed with 34 birds divided into two equal groups consisting of females and males. During whole period of the breeding cycle all birds were kept under identical environmental conditions and had free access to fresh water and feed supplied in accordance to their growth stage. At the age of 20 weeks of life, final body weights of birds were measured and breast muscle samples were obtained. To evaluate free amino acid concentrations in breast muscles, the samples were analyzed with the use of ion-exchange chromatography. Statistical comparison of amino acid concentration in breast muscles of females and males was performed using non-paired Student's t-test. Final body weight was 27.6% higher in male than in female turkeys. Skeletal muscle concentration of glutamine, tryptophan, serine and asparagine was found to be significantly higher in males than in females, while opposite results were obtained analyzing cysteic acid, taurine and valine. In conclusion this study revealed sex-differentiated final body weight and skeletal muscle amino acid concentrations in turkeys. Improved skeletal muscle metabolism of functional amino acids glutamine and tryptophan in males may be postulated as crucial factors responsible for their higher growth rate and final body weight when compared to females. The obtained results may serve to optimizing feed for turkeys and their systemic development.

Age- and Sex-related Differences of Morphometric, Densitometric and Geometric Parameters of Tibiotarsal Bone in Ross Broiler Chickens

“…It is visible as morphological differences and it stems from different physiological purpose of both sexes. According to the most recent studies (TATARA et al 2012a), it is manifested by hormonal and metabolic differentiation resulting in different amounts of muscle tissue, its amino-acid composition, body mass and skeletal properties.…”

Serum Concentration of Free Amino Acids in Dogs Suffering From Perianal Tumours

“…Analytical separation of acidic and alkaline amino acids was performed at 38-39˚C, while neutral amino acids were separated at 59-60˚C. The original software MIKRO version 1.8.0 (Ingos Corp., Czech Republic) was used for amino acid evaluation (15,27,28).…”

RNA-Seq Analysis Reveals Spatial and Sex Differences in Pectoralis Major Muscle of Broiler Chickens Contributing to Difference in Susceptibility to Wooden Breast Disease

“…Considering the correlation of WBD with increased body and breast muscle mass and growth rates, it could be assumed that male birds and the cranial aspect of the pectoralis major muscle are more susceptible to WBD because they grow faster and larger than female birds and the caudal aspect of the muscle. It is a fact that male broiler chickens tend to have higher pectoralis major and overall body masses than females, as well as typically growing at a faster rate (Scheuermann et al, 2003; Tatara et al, 2012; Trocino et al, 2015). Therefore, the key to understanding increased WBD incidence and severity in male broilers and the cranial region of the muscle is understanding the biological differences between sexes of birds and regions of the pectoralis major that are associated with higher growth rates and body size.…”