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Association between Productive and Reproductive Indices in Iranian Holstein Cows | ||
| علوم و فنون دامپروری | ||
| Article 2, Volume 7, Issue 26, June 2018, Pages 21-32 PDF (1.29 M) | ||
| DOI: 10.22092/aasrj.2017.111124.1109 | ||
| Authors | ||
| Mohammad Ziadi; A. Ghazikhani* | ||
| Department of Animal Science, Islamic Azad University, Saveh Branch, Saveh, Iran | ||
| Abstract | ||
| This study was conducted to estimate relationship between production trait including milk yield, fat and protein percent, ECM and reproduction traits including age at first calving, calving interval, days open and dry days. Data collected by Iranian Animal Breeding Center during 1983 to 2011 were used. Data included 50844, 47309, 19885 for milk yield, fat and protein percent respectively and all reproduction records. Data with a DBF format was corrected and saved using FOXPRO software in separate files for analysis. Average ± deviation for 305 days milk yield was 7038.14±1209.06 kg. Average ± for dry days, calving interval, age at first calving and days open was 67.19±16.38, 373.95±49.13, 26.17±3.09 and 91.53±20.46, respectively. The phenotypic correlation between milk yield with dry days, age at first calving, calving interval and days open was -0.14, 0.04, 0.04 and 0.03, respectively. Most correlation was very low. The moderate correlation was related to calving interval and days open (0.31). | ||
| Keywords | ||
| production traits; reproduction traits; correlation; Holstein dairy cattle | ||
| References | ||
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