مورد إلكتروني
Influence of dietary amino acid adequacy on performance and muscle protein turnover in poults
| العنوان: | Influence of dietary amino acid adequacy on performance and muscle protein turnover in poults |
|---|---|
| بيانات النشر: | Virginia Polytechnic Institute and State University 1985 |
| تفاصيل مُضافة: | Jackson, Starr E. |
| نوع الوثيقة: | Electronic Resource |
| وصف مادي: | ix, 192 leaves |
| مستخلص: | Several experiments were conducted to identify the limiting amino acids in a 22% corn-soybean meal diet for poults from one to three weeks of age. Additional studies were designed to investigate changes in muscle composition and protein turnover in response to essential (EAA) and nonessential amino acid (NEAA) supplementation of the low protein diet. Developmental changes in muscle metabolism as well as differences between muscles were also examined. Protein synthesis was determined using a ¹⁴C-tyrosine emulsion technique. Protein degradation was calculated as the difference between synthesis and deposition rates. A 30% protein diet served as a control in all experiments. Methionine was confirmed as the first limiting amino acid. Individual deletion of EAA from a mixture added to the 22% protein diet indicated deficiencies of lysine, threonine and valine. Although lysine was more deficient than valine, the valine deficit was exacerbated by high dietary leucine and isoleucine levels. A dietary level of 1.25% valine was inadequate to support optimum growth, inferring a higher requirement than current recommendations. The addition of methionine, lysine and threonine and valine to the 22% protein diet supported maximum growth but feed efficiency remained depressed. Improvements in performance associated with NEAA supplementation indicated a crude protein deficiency in the 22% protein diet. The weights of the pectoralis and gastrocnemius muscles varied directly with body weight. Increases in pectoralis weight were primarily the result of expansions in DNA-unit size. Changes in DNA-unit size and number of the gastrocnemius could not be demonstrated despite consistent alterations in muscle mass. A supplement of methionine and lysine significantly decreased pectoral synthesis rate although protein synthesis tended to decline with any combination of added amino acids. The fractional synthesis rate in the gastrocnemius was relatively stable regardless of diet although a decre |
| مصطلحات الفهرس: | Turkeys -- Feeding and feeds, Turkeys -- Physiology, Turkeys -- Experiments, Dissertation |
| URL: | |
| الإتاحة: | Open access content. Open access content In Copyright http://rightsstatements.org/vocab/InC/1.0 |
| ملاحظة: | en_US |
| أرقام أخرى: | VPI oai:vtechworks.lib.vt.edu:10919/54299 1391202134 |
| المصدر المساهم: | VIRGINIA TECH From OAIster®, provided by the OCLC Cooperative. |
| رقم الأكسشن: | edsoai.on1391202134 |
| قاعدة البيانات: | OAIster |
| الوصف غير متاح. |