| Yazarlar (4) |
Prof. Dr. Aziz ŞAHİN
Kırşehir Ahi Evran Üniversitesi, Türkiye |
Z. Ulutas
Tokat Gaziosmanpaşa Üniversitesi, Turkey |
|
A. Yilmaz Adkinson
Erciyes Üniversitesi, Turkey |
|
R. W. Adkinson
Erciyes Üniversitesi, Turkey |
| Özet |
| A study was conducted to assess the influence of genetic and environmental factors on Brown Swiss calf birth weight, and to estimate variance components, genetic parameters, and breeding values. Data were collected on 1,761 Brown Swiss calves born from 1990 to 2005 in the Konuklar State Farm in Turkey. Mean birth weight for all calves was 39.3 ± 0.09 kg. Least squares mean birth weights for male and female Brown Swiss calves were 40.3 ± 0.02 and 39.0 ± 0.02 kg, respectively. Variance components, genetic parameters, and breeding values for birth weight in Brown Swiss calves were estimated by restricted error maximum likelihood (REML)-best linear unbiased prediction(BLUP) procedures using an MTDFREML (multiple trait derivative free restricted maximum likelihood) program employing an animal model. Direct heritability (hd2), maternal heritability (hm2), total heritability (hT2), ram and cam estimates were 0.12, 0.09, 0.23, -0.58, and -0.06, respectively. The estimated maternal permanent environmental variance expressed as a proportion of the phenotypic variance (c2) was 0.05. Breeding values were estimated for the trait and used to evaluate genetic trends across the time period investigated. The genetic trend linear regression was not different from zero. No genetic trend for birth weight was expected, since there had been no direct selection pressure on the trait. Absence of a trend confirms that there was no change due to selection pressure on correlated traits. Genetic and environmental parameter estimates were similar to literature values indicating that effective selection methods used in more developed improvement programs would be effective in Turkey as well. © 2011 Springer Science+Business Media B.V. |
| Anahtar Kelimeler |
| Direct heritability | Genetic trend | Maternal heritability | Phenotypic trend | Total heritability |
| Makale Türü | Özgün Makale |
| Makale Alt Türü | SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale |
| Dergi Adı | Tropical Animal Health and Production |
| Dergi ISSN | 0049-4747 |
| Dergi Tarandığı Indeksler | SCI-Expanded |
| Makale Dili | İngilizce |
| Basım Tarihi | 06-2012 |
| Cilt No | 44 |
| Sayı | 5 |
| Sayfalar | 1027 / 1034 |
| Doi Numarası | 10.1007/s11250-011-0036-6 |
| Makale Linki | http://link.springer.com/10.1007/s11250-011-0036-6 |
| Atıf Sayıları | |
| WoS | 5 |
| SCOPUS | 4 |
| Google Scholar | 16 |
