AI Article Synopsis
- The study assessed the impact of imported Holstein bull semen from different countries on the economic performance of their daughters in Iran using the Lifetime Net Income (LNI) index.
- Data from over 274,000 lactation records were analyzed, focusing on key traits such as milk production, calving age, and calving interval through advanced statistical methods.
- Results indicated significant differences in breeding values based on the origin of the bull semen, with French sires' daughters showing the best performance in most climates, while German sires excelled in colder conditions.
Article Abstract
The aim of the present study was to evaluate the effects of imported semen of Holstein bulls from different countries on the economic traits of their daughters using the Lifetime Net Income (LNI) index in various climates of Iran. The data included the first lactation records of 274,057 Holstein cows collected during 1993 to 2017 by the Animal Breeding Center of Iran from 10 large dairy farms located in various provinces of Iran. The investigated traits included milk, fat and protein yields, calving age and calving interval. Breeding values of progenies were predicted by the Best Linear Unbiased Prediction (BLUP) method under the multi-trait animal model using DMU software. The genetic-economic merit of the progenies was estimated by the LNI index. There were significant differences between the estimated breeding values (EBVs) of sire groups (based on bull semen origin) for milk, fat and protein yields, calving age and calving interval in each climate (p < 0.01). The obtained results showed that the highest least-square means of LNI index in semi-cold, moderate and warm climates belonged to the daughters of French sires; however, daughters of German sires were estimated to have the highest least-square means in the cold climate.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9653833 | PMC |
| http://dx.doi.org/10.3390/ani12213054 | DOI Listing |
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