Next Article in Journal
Modification of the Feline-Ality™ Assessment and the Ability to Predict Adopted Cats’ Behaviors in Their New Homes
Previous Article in Journal
Pet Food Palatability Evaluation: A Review of Standard Assay Techniques and Interpretation of Results with a Primary Focus on Limitations
Article Menu

Export Article

Open AccessArticle
Animals 2015, 5(1), 56-70; doi:10.3390/ani5010056

Evaluating the Age-Dependent Potential for Protein Deposition in Naked Neck Meat Type Chicken

1
Division Animal Nutrition Physiology, Department of Animal Sciences, Georg-August-University, Kellnerweg 6, 37077 Goettingen, Germany
2
Division Animal Breeding and Genetics, Department of Animal Sciences, Georg-August-University, Albrecht-Thaer-Weg 3, 37075 Goettingen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Clive J. C. Phillips
Received: 29 September 2014 / Revised: 10 December 2014 / Accepted: 9 January 2015 / Published: 19 January 2015
View Full-Text   |   Download PDF [501 KB, uploaded 19 January 2015]   |  

Simple Summary

Growth rates of fast-growing chickens are reduced by a higher ambient temperature (AT) because of difficulties in dissipating heat through the feather coverage. Naked neck meat type genotypes could be helpful in increasing the tolerance for high AT. However, basic model parameters of this genotype necessary to further assess amino acid requirements are as yet unavailable. The experiments were conducted to estimate both the daily nitrogen maintenance requirement (NMR) and the potential for daily nitrogen retention NRmaxT). These observed model parameters provide the basic information to characterize the growth potential of the genotype for further application in modeling of individual amino acid requirements of naked neck meat type chicken.

Abstract

The introduction of the naked neck gene (Na) into modern meat type chicken is known to be helpful in increasing the tolerance for a high ambient temperature (AT) by reducing the feather coverage which allows for a higher level of heat dissipation compared to normally feathered (na/na) birds. In addition, reduced feather coverage could affect requirements for sulfur containing amino acids. As a prerequisite for further modeling of individual amino acid requirements, the daily N maintenance requirement (NMR) and the threshold value of daily N retention (NRmaxT) were determined. This was carried out using graded dietary protein supply and exponential modeling between N intake (NI) and N excretion (NEX) or N deposition (ND), respectively. Studies with homozygous (Na/Na) and heterozygous (Na/na) naked neck meat type chicken utilized 144 birds of average weight (50% of each genotype and sex) within two N balance experiments during both the starter (days 10–20) and the grower period (days 25–35). Birds were randomly allotted to five diets with graded dietary protein supply but constant protein quality. The observed estimates depending on genotype, sex and age varied for NMR and NRmaxT from 224 to 395 and 2881 to 4049 mg N/BWkg0.67/day, respectively. View Full-Text
Keywords: naked neck meat type chicken; N utilization model; N maintenance requirement; protein deposition potential naked neck meat type chicken; N utilization model; N maintenance requirement; protein deposition potential
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Khan, D.R.; Wecke, C.; Sharifi, A.R.; Liebert, F. Evaluating the Age-Dependent Potential for Protein Deposition in Naked Neck Meat Type Chicken. Animals 2015, 5, 56-70.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Animals EISSN 2076-2615 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top