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Managing Colllinearity in Modeling the Effect of Age in the Prediction of Egg Components of Laying Hens Using Stepwise and Ridge Regression Analysis
Shafey, T. M; Hussein, E. S; Mahmoud, A. H; Abouheif, M. A; Al-Batshan, H. A.
Affiliation
  • Shafey, T. M; King Saud University. College of Food and Agriculture Sciences. Department of Animal Production. Riyadh. SA
  • Hussein, E. S; King Saud University. College of Food and Agriculture Sciences. Department of Animal Production. Riyadh. SA
  • Mahmoud, A. H; King Saud University. College of Science. Department of Zoology. Riyadh. SA
  • Abouheif, M. A; King Saud University. College of Food and Agriculture Sciences. Department of Animal Production. Riyadh. SA
  • Al-Batshan, H. A; King Saud University. College of Food and Agriculture Sciences. Department of Animal Production. Riyadh. SA
Rev. bras. ciênc. avic ; 17(4): 473-482, oct.-dec. 2015. tab, graf
Article in En | VETINDEX | ID: biblio-1490197
Responsible library: BR68.1
Localization: BR68.1
ABSTRACT
The relationships between egg measurements [egg weight (EGWT), egg width (EGWD), egg shape index (EGSI), egg volume (EGV) and egg density (EGD)], and egg components [eggshell (SWT), yolk (YWT) and albumen (AWT)] were investigated in laying hens with 32, 45, and 59 weeks of age with an objective of managing multicollinearity (MC), using stepwise regression (SR) and ridge regression (RR) analyses. There were significant correlations among egg traits that led to MC problems in all eggs. Hen age influenced egg characteristics and the magnitude of the correlations among egg characteristics. Eggs produced at older age had significantly (p 0.01) higher EGWT, EGWD, EGV, YWT and AWT than those produced at younger age. The SR model alleviated MC problem in eggs produced at 32 weeks, with condition index greater than 30, and one predictor, EGWT had a model fit predicted egg components with R2 ranged from 60 to 99%. The SR model of eggs produced at 45 and 59 weeks indicated MC problem with variance inflation factors (VIF) values greater than 10, and 4 predictors; EGWT, EGWD, EGV and EGD had a model fit that significantly predicted egg components with R2 % ranged from 76 to 99 %. The RR analysis provided lower VIF values than 10 and eliminated the MC problem for eggs produced at any age group. It is concluded that the RR analysis provided an ideal solution for managing the MC problem and successfully predicting egg components of laying hens from egg measurements.
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Full text: 1 Database: VETINDEX Main subject: Ovum / Age Factors Limits: Animals Language: En Journal: Rev. bras. ciênc. avic Year: 2015 Document type: Article

Full text: 1 Database: VETINDEX Main subject: Ovum / Age Factors Limits: Animals Language: En Journal: Rev. bras. ciênc. avic Year: 2015 Document type: Article