GENETIC PARAMETER ESTIMATION OF DYSTOCIA VARIABLE IN IRANIAN HOLSTEIN DAIRY CATTLE
2016
Karami Maryam | M.T.BeigiNassiri BeigiNassiri | A.Nazari Nejad | M. Chaji Chaji | H. Roshanfekr Roshanfekr | B. Mohammad Nazari
aim of this study was to estimated genetic parameters of dystocia variable in Holsteindairy cows in Iran. For this purpose we used of data set that related to 734 herds of Holsteincows in Iran that was collected from 24 years ago (between 1990-2014) by breeding centerand improve livestock production of Iran country. To study the structure of the data,descriptive statistics and observations to correction effects we used of the SAS 9.1 statisticalsoftware and GLM procedure. To obtain genetic parameters attribute dystocia we used of AIREML procedures of WOMBAT software to analyzed univariate linear model and the resultsobtained are as follows: Additive variance, residual variance, phenotypic variance andheritability (±SE) for the first period of lactation, are 0.0045103, 0.029629, 0.034139,0.132±0.003 respectively, for the second period of lactation are 0.00063452, 0.073695,0.074329, 0.009±0.002 respectively and for third period of lactation are 0.00036919,0.073817, 0.074187, 0.005±0.001 respectively was estimated. In all three lactation periodswe can seen that lowest percentage of dystocia was occurred at age 27 to 28 months 18.66%,between the ages of 28 to 38 months 10.14% and for ages 40 to 51 months 9.61% and by considering Cochran Armitage test results we can determined that the difference between the classes for this trend is significant statistically(p<0.0001).
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