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201871

GENETIC EVALUATION AND PRINCIPAL COMPONENTS ANALYSIS FOR MILK ‎TRAITS IN HOLSTEIN FRIESIAN CATTLE

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Last updated: 04 Jan 2025

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Abstract

The aim of the current study was to estimate genetic principal components analysis for milk traits of breeding value (BV) in Holstein Friesian (HF). A total number of 2067 records cow from 80 sires and 439 dams; during 10 consecutive years that included the four seasons for each year and six parities from the commercial farms nearly the Nile Delta, Egypt. Studied traits were total milk yield (TMY), lactation period (LP), calving interval (CI), number of services per conception (NSPC) and days open (DO).  Data for milk traits (MT) were analyzed using a single trait animal model program used to estimate genetic parameters, in addition to using a method principal components analysis (PCA) program, which aims to increase the accuracy of estimating genetic evaluation.
The heritability (h2a) estimates were 0.20±0.001, 0.22±0.002, 0.02±0.001, 0.04 ± 0.001 and 0.05±0.020 for TMY, LP, CI, NSPC and DO, respectively. The total variance of breeding values was 67.1, in which 46.6% and 20.5% were explained by PC1 and PC2, respectively. Two principal components (1&2) were estimated by BV. Equations for PCA were: PC1= 0.273 TMY + 0.342 LP + 0.371 CI + 0.318 NSPC - 0.004 DO, and PC2= 0.213 TMY - 0.069 LP - 0.146 CI + 0.045 NSPC + 0.949 DO.
The results of genetic PCA indicate that milk traits were highly significant, also improve TMY. Improved all traits under study would be expected to use analysis PC1 and PC2 provides to overcome the multicollinearity problem while predicting the future TMY, thus achieving an increased economic return.

DOI

10.21608/ejap.2021.89486.1019

Keywords

Milk Traits, genetic parameters, Principal component analysis, ‎‏ ‏Holstein Friesian‎

Authors

First Name

Safaa

Last Name

Sanad

MiddleName

-

Affiliation

Animal Production Research Institute (APRI), Agriculture Research Center (ARC), Egypt

Email

dr_safaasalah@yahoo.com

City

Cario

Orcid

-

First Name

Mahmud

Last Name

Gharib

MiddleName

-

Affiliation

Animal Production Research Institute (APRI), Agriculture Research Center (ARC), Egypt

Email

mghreeb95@yahoo.com

City

Cario

Orcid

-

Volume

58

Article Issue

3

Related Issue

28468

Issue Date

2021-10-01

Receive Date

2021-08-06

Publish Date

2021-10-01

Page Start

113

Page End

121

Print ISSN

0302-4520

Online ISSN

2735-3028

Article File

EJAP_Volume 58_Issue 3_Pages 113-121.pdf

PDF . 1.2MB

Link

https://ejap.journals.ekb.eg/article_201871.html

Detail API

https://ejap.journals.ekb.eg/service?article_code=201871

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Original Article

Type Code

1,298

Publication Type

Journal

Publication Title

Egyptian Journal of Animal Production

Publication Link

https://ejap.journals.ekb.eg/

MainTitle

GENETIC EVALUATION AND PRINCIPAL COMPONENTS ANALYSIS FOR MILK ‎TRAITS IN HOLSTEIN FRIESIAN CATTLE

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Article

Created At

22 Jan 2023