Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle
Yıl: 2001 Cilt: 25 Sayı: 2 Sayfa Aralığı: 179 - 184 Metin Dili: İngilizce İndeks Tarihi: 29-07-2022
Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle
Öz: Estimates of (co)variance components and breeding values for pre-weaning (100-day) and post-weaning (300-day) weights were obtained for a commercial herd of Welsh Black cattle recorded from 1976 to 1996. Estimates were obtained from six animal models ranging from a model with only an additive direct effect to a model that also included an additive maternal effect, a maternal permanent environmental effect and a covariance between additive direct and additive maternal effects. The most appropriate model for 100-day weight, based on a likelihood ratio test, was a model with additive direct and additive maternal effects with no covariance between them, yielding estimates of 0.25 (0.053) and 0.07 (0.025) for $h^{2}$ and $m^{2}$ respectively. For 300-day weight, the model with only an additive direct effect was the most appropriate with an $h^{2}$ of 0.27 (0.050). Trends in additive direct breeding values for 100-day and 300-day weights were 0.39 (0.029) and 0.96 (0.077) kg per annum respectively. Additive maternal breeding values for 100-day weight increased by 0.08 (0.008) kg/annum. A correlation of 0.77 (0.066) was estimated between additive direct effects for 100- and 300-day weight.
Anahtar Kelime: Konular:
Etci ırk buzağı ve danaların süt emme döneminde ve sütten kesimden sonraki ağırlıklarına ait genetik paramtrelerin ve damızlık değerlerinin altı değişik modelle tahmini
Öz: Estimates of (co)variance components and breeding values for pre-weaning (100-day) and post-weaning (300-day) weights were obtained for a commercial herd of Welsh Black cattle recorded from 1976 to 1996. Estimates were obtained from six animal models ranging from a model with only an additive direct effect to a model that also included an additive maternal effect, a maternal permanent environmental effect and a covariance between additive direct and additive maternal effects. The most appropriate model for 100-day weight, based on a likelihood ratio test, was a model with additive direct and additive maternal effects with no covariance between them, yielding estimates of 0.25 (0.053) and 0.07 (0.025) for $h^{2}$ and $m^{2}$ respectively. For 300-day weight, the model with only an additive direct effect was the most appropriate with an $h^{2}$ of 0.27 (0.050). Trends in additive direct breeding values for 100-day and 300-day weights were 0.39 (0.029) and 0.96 (0.077) kg per annum respectively. Additive maternal breeding values for 100-day weight increased by 0.08 (0.008) kg/annum. A correlation of 0.77 (0.066) was estimated between additive direct effects for 100- and 300-day weight.
Anahtar Kelime: Konular:
Belge Türü: Makale Makale Türü: Araştırma Makalesi Erişim Türü: Erişime Açık
APA | ULUTAŞ Z, DEWI I, SAATCI M (2001). Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. , 179 - 184. |
Chicago | ULUTAŞ Zafer,DEWI Ioan Ap,SAATCI Mustafa Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. (2001): 179 - 184. |
MLA | ULUTAŞ Zafer,DEWI Ioan Ap,SAATCI Mustafa Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. , 2001, ss.179 - 184. |
AMA | ULUTAŞ Z,DEWI I,SAATCI M Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. . 2001; 179 - 184. |
Vancouver | ULUTAŞ Z,DEWI I,SAATCI M Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. . 2001; 179 - 184. |
IEEE | ULUTAŞ Z,DEWI I,SAATCI M "Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle." , ss.179 - 184, 2001. |
ISNAD | ULUTAŞ, Zafer vd. "Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle". (2001), 179-184. |
APA | ULUTAŞ Z, DEWI I, SAATCI M (2001). Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. Turkish Journal of Veterinary and Animal Sciences, 25(2), 179 - 184. |
Chicago | ULUTAŞ Zafer,DEWI Ioan Ap,SAATCI Mustafa Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. Turkish Journal of Veterinary and Animal Sciences 25, no.2 (2001): 179 - 184. |
MLA | ULUTAŞ Zafer,DEWI Ioan Ap,SAATCI Mustafa Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. Turkish Journal of Veterinary and Animal Sciences, vol.25, no.2, 2001, ss.179 - 184. |
AMA | ULUTAŞ Z,DEWI I,SAATCI M Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. Turkish Journal of Veterinary and Animal Sciences. 2001; 25(2): 179 - 184. |
Vancouver | ULUTAŞ Z,DEWI I,SAATCI M Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle. Turkish Journal of Veterinary and Animal Sciences. 2001; 25(2): 179 - 184. |
IEEE | ULUTAŞ Z,DEWI I,SAATCI M "Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle." Turkish Journal of Veterinary and Animal Sciences, 25, ss.179 - 184, 2001. |
ISNAD | ULUTAŞ, Zafer vd. "Six different odels for estimation of genetic paraeters and breeding values for pre-weaning and post - weaning weights in suckler cattle". Turkish Journal of Veterinary and Animal Sciences 25/2 (2001), 179-184. |