Estimation of genetic parameters for reproduction traits In sheep
Küçük Resim Yok
Tarih
2000
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Eugen Ulmer Gmbh Co
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Reproduction traits, known as the most important trait in lamb production, was investigated with respect to the genetic determination of age at first lambing (ELA), lambing interval (ZLZ), total number born, number of born alive and stillborn lambs These traits were analysed based on multiple-trait as well as repeatability animal models. Finally the genetic parameters of different breed were compared, The data consisted of 35381 lambings collected from 1988 to 1998. Age at the first lambing showed a bimodal distribution and was therefore divided into two traits. The first trait (ELA1) consisted of ewes, with age at first lambing of less than or equal to 550 days, the second trait (ELA2) consisted of ewes with age at first lambing of > 550 days. Heritabilities of both traits were moderate to high (h(2) = 0.31 and h(2) = 0,41) for ELA1 and ELA2, respectively. Genetic correlation between these traits was r(g) = 0,33. Genetic correlation between lambing interval from first to second (ZLZ1, h(2) = 0,18) and from second to third lambing (ZLZ2, h(2) = 0,17) was low (r(g) = -0,09). This shows that the genetic determination of these two traits were different and they should be treated as two different traits. Different genetic determination was also found for number of lambs born alive at first parity (LGL1, h(2) = 0,09) and at second and further parities (LGL2, h(2) = 0,10). Their genetic correlation was r(g) = 0,66. The heritability of total number born lambs was only slightly higher as for number of lambs born alive. The number of stillborn lambs showed the lowest heritabilities of h(2) = 0,07, 0,02 and 0,05 for first, second and third parity, respectively. There were differences in magnitude of heritabilities between breeds. Based on the results of this study there was recommended to select on breeding values for the traits ELA1, ELA2, ZLZ1, ZLZ2, LGL1 and LGL2 in order to improve the reproductive performance in the population.
Açıklama
Anahtar Kelimeler
Lamb Production
Kaynak
Zuchtungskunde
WoS Q Değeri
Q3
Scopus Q Değeri
Cilt
72
Sayı
3
