Genetics aspects of reproductive performance for Holstein
A total of 16678 records of age at first calving and ages at next calving , in addition to 14058 records of calving interval belonged to Holstein cows were analysed over period from 1992 to 2003 , at the Nasr Dairy Cattle Station, United Company for Animal Resources Ltd., Al-Soueira ( 50 Km South of...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
University of Baghdad, College of Veterinary Medicine
2006-12-01
|
| Series: | The Iraqi Journal of Veterinary Medicine |
| Online Access: | https://jcovm.uobaghdad.edu.iq/index.php/Iraqijvm/article/view/821 |
| _version_ | 1798023751720239104 |
|---|---|
| author | F. R. Al-Samarai |
| author_facet | F. R. Al-Samarai |
| author_sort | F. R. Al-Samarai |
| collection | DOAJ |
| description | A total of 16678 records of age at first calving and ages at next calving ,
in addition to 14058 records of calving interval belonged to Holstein cows were
analysed over period from 1992 to 2003 , at the Nasr Dairy Cattle Station,
United Company for Animal Resources Ltd., Al-Soueira ( 50 Km South of
Baghdad ). Data was analaysed using General Linear Model within the SAS
program to study the effects of some fixed factors on the studied traits .
Components of variance for the random effects was estimated by the
Minimum Variance Quadratic Unbised Estimation Procedure ( MIVQUE ) , also
phenotypic trend was estimated for all traits .
The overall means for age at first calving till the age at sixth calving were
48.17 , 62.77 , 77.41 , 91.35 , 105.53 months respectively , and the heritability
for the same traits was 0.10 , 0.01 , 0.03 , 0.04 , 0.02 , 0.11 respectively .
whereas the overall mean of calving interval and heritability was 458.59 days
and 0.07 .
The results obtained that there was a significant effect of year of birth on
age at first calving , whereas the season of birth was not .
All the estimates of heritability were low so it’s reflect the role of
environment factors in the traits variation.Phenotypic trend was negative and
significant ( p <0.01 ) for age at first calving ( - 1.05 month / year ) and calving
interval (- 2.03 day / year ) . |
| first_indexed | 2024-04-11T17:52:32Z |
| format | Article |
| id | doaj.art-d8da920578f54aad8f31908796e25cc9 |
| institution | Directory Open Access Journal |
| issn | 1609-5693 2410-7409 |
| language | English |
| last_indexed | 2024-04-11T17:52:32Z |
| publishDate | 2006-12-01 |
| publisher | University of Baghdad, College of Veterinary Medicine |
| record_format | Article |
| series | The Iraqi Journal of Veterinary Medicine |
| spelling | doaj.art-d8da920578f54aad8f31908796e25cc92022-12-22T04:11:03ZengUniversity of Baghdad, College of Veterinary MedicineThe Iraqi Journal of Veterinary Medicine1609-56932410-74092006-12-0130210.30539/iraqijvm.v30i2.821Genetics aspects of reproductive performance for HolsteinF. R. Al-Samarai0College of Veterinary Medicine, Baghdad UniversityA total of 16678 records of age at first calving and ages at next calving , in addition to 14058 records of calving interval belonged to Holstein cows were analysed over period from 1992 to 2003 , at the Nasr Dairy Cattle Station, United Company for Animal Resources Ltd., Al-Soueira ( 50 Km South of Baghdad ). Data was analaysed using General Linear Model within the SAS program to study the effects of some fixed factors on the studied traits . Components of variance for the random effects was estimated by the Minimum Variance Quadratic Unbised Estimation Procedure ( MIVQUE ) , also phenotypic trend was estimated for all traits . The overall means for age at first calving till the age at sixth calving were 48.17 , 62.77 , 77.41 , 91.35 , 105.53 months respectively , and the heritability for the same traits was 0.10 , 0.01 , 0.03 , 0.04 , 0.02 , 0.11 respectively . whereas the overall mean of calving interval and heritability was 458.59 days and 0.07 . The results obtained that there was a significant effect of year of birth on age at first calving , whereas the season of birth was not . All the estimates of heritability were low so it’s reflect the role of environment factors in the traits variation.Phenotypic trend was negative and significant ( p <0.01 ) for age at first calving ( - 1.05 month / year ) and calving interval (- 2.03 day / year ) .https://jcovm.uobaghdad.edu.iq/index.php/Iraqijvm/article/view/821 |
| spellingShingle | F. R. Al-Samarai Genetics aspects of reproductive performance for Holstein The Iraqi Journal of Veterinary Medicine |
| title | Genetics aspects of reproductive performance for Holstein |
| title_full | Genetics aspects of reproductive performance for Holstein |
| title_fullStr | Genetics aspects of reproductive performance for Holstein |
| title_full_unstemmed | Genetics aspects of reproductive performance for Holstein |
| title_short | Genetics aspects of reproductive performance for Holstein |
| title_sort | genetics aspects of reproductive performance for holstein |
| url | https://jcovm.uobaghdad.edu.iq/index.php/Iraqijvm/article/view/821 |
| work_keys_str_mv | AT fralsamarai geneticsaspectsofreproductiveperformanceforholstein |