| Number of Journals | 52 |
| Number of Issues | 2,092 |
| Number of Articles | 21,685 |
| Article View | 79,970,468 |
| PDF Download | 25,561,880 |
Estimation of Genetic Parameters for Milk Yield Using Random Regression Test Day Model in Iranian Holstein | ||
| پژوهشهای علوم دامی ایران | ||
| Article 12, Volume 3, Issue 3 - Serial Number 7, September 2011 PDF (163.3 K) | ||
| Document Type: Scientific - Research Articles | ||
| DOI: 10.22067/ijasr.v3i3.11304 | ||
| Authors | ||
| Atefe Seyyeddokht* 1; Ali Asghar Aslaminejad2; Mojtaba Tahmoorespur2; Homayon Farhangfar3 | ||
| 1Department of Animal Science, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran. | ||
| 2Department of Animal Sciences, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran | ||
| 3Department of Animal Science, Birjand Faculty of Agriculture, Birjand, Iran | ||
| Abstract | ||
| In this study a total of 171,360 monthly test day milk records obtained from first lactation of Iranian Holstein cattle (three times a day milking) distributed in 96 herds and calved from 1999 to 2008 were used to estimate genetic parameters and to predict breeding values of the animals. The data was analyzed using Random Regression Test Day Model. The results showed that average of heritability for the second half of lactation period was higher than that of the first half. The heritability value for the first month was lowest and for the eighth and ninth months of the lactation was highest compared to the other months of lactation. The genetic correlations between monthly test day records decreased by increasing the distances between months of lactation. | ||
|
Statistics Article View: 2,294 PDF Download: 1,190 |
||