Staff Members - Benha University
Application of linear discriminant model to evaluate the association between milk production, reproductive performance, and calving season in dairy cattle
Benha Veterinary Medical Journal • 2020
Publication Information
Authors
Hayaa A. Abd-El Rahman; Fardos A.M. Hassan; Eman R. Kamel
Keywords
Dairy cattle, Discriminant Analysis, Milk yield, Reproductive measures
Journal
Benha Veterinary Medical Journal
Publisher
Not Available
Volume
39
Issue
Not Available
Pages
138-141
publication.type
Local
Paper Link
Not Available
Supplementary Materials
Not Available
Abstract
This study was aimed to determine the performance of linear discriminant analysis (LDA) for
differentiation between seasons of calving on the basis of 305day- milk yield, fat %, protein
%, days open (DO), days to first insemination (DFI), and number of services per conception.
By considering the assumption of this method, a random sample was selected from the animals
being represented by all explanatory variables. The discrimination between seasons of calving
was depended on the significance of coefficients, classification rate, in addition to the group
centroids. Results showed that LDA method selected 305day-milk yield (kg), days open (DO),
days to first insemination and number of services per conception, as the significant (P < 0.05)
contributors for data classification. The total variance explained by 2 functions was 79.2% and
15.9%, respectively. So, the 1st function can do well in discrimination process than the 2ndone.
The percentage of correct classification was 64.6%. In conclusion, LDA can be used effectively
for classification of calving seasons, even with violation of normality assumption
differentiation between seasons of calving on the basis of 305day- milk yield, fat %, protein
%, days open (DO), days to first insemination (DFI), and number of services per conception.
By considering the assumption of this method, a random sample was selected from the animals
being represented by all explanatory variables. The discrimination between seasons of calving
was depended on the significance of coefficients, classification rate, in addition to the group
centroids. Results showed that LDA method selected 305day-milk yield (kg), days open (DO),
days to first insemination and number of services per conception, as the significant (P < 0.05)
contributors for data classification. The total variance explained by 2 functions was 79.2% and
15.9%, respectively. So, the 1st function can do well in discrimination process than the 2ndone.
The percentage of correct classification was 64.6%. In conclusion, LDA can be used effectively
for classification of calving seasons, even with violation of normality assumption