Investigation of Breeding Value Correlation between Milk Production and Lactation Persistency Traits in Iranian Holstein Cattle Using Random Regression Model

پژوهشهای علوم دامی ایران

Article 9, Volume 4, Issue 1 - Serial Number 9, March 2012   

Document Type: Scientific - Research Articles

DOI: 10.22067/ijasr.v4i1.13913

Authors

Reza Seyedsharifi^{* 1}; Moradpasha Eskandarinasab²; Jamal Seifdavati¹; nejat Badbarin³

¹Animal Science Department of University of Mohaghegh Ardebili, Ardebil, Iran.

²Ferdwosi University of Mashhad

³Ferdowsi University of Mashhad

Abstract

In this investigation 13699 data related to milk production from 2716 Holstein first calving and daughter
from 167 sire cows were analyzed based on random regression model (RR/CF) and REML Method incomplete
lactating (5-90 days) and (5-120 days) in correlations to complete lactating were 0.67 and 0.72, respectively with
progress in complete 5-240 day was 0.91 the correlation value for lactating persistency trait for incomplete
lactating period (5-150 days) were 0.68 and as increase in milk production period this value reaches to 0.91 for
incomplete period (5-240 days). Also this correlation for two months milk production and lactating persistency
were 0.88 and 0.59, respectively, and for one month milk production and lactating persistency reached higher
than 0.90.

Keywords

Breeding value correlation; Milk production and persistency; Random Regression Model 1; 3- Instructors