文章基本信息

标题：Phenotypic and genetic parameters of milk yield traits in first-calf heifers of Holstein-Friesian breed
本地全文：下载
作者：Popovac, Mladen ; Miletić, Aleksandar ; Raguž, Nikola 等
期刊名称：Mljekarstvo
印刷版ISSN：0026-704X
电子版ISSN：1846-4025
出版年度：2020
卷号：70
期号：2
页码：93-102
DOI：10.15567/mljekarstvo.2020.0203
出版社：Hrvatska Mljekarska Udruga
摘要：The objective of this paper was to study variability, heritability and correlation of the three production traits in 1409 first-calf heifers of Holstein-Friesian breed; including the determination of the quantity of milk during lactation (ML), the quantity of milk fat during lactation (MM) and the quantity of protein during lactation (PR). According to the obtained results it could be concluded that there were statistically significant differences (P0.05) on variability of any of the examined traits, while the farm on which animals were raised had no effect (P>0.05) on MM, and year and age at first calving did not demonstrate (P>0.05) statistically significant effect on ML and PR. By applying the animal model, based on the use of kinship matrix which involved 3867 animals, by help of REML methodology following heritability coefficients were evaluated: ML h2= 0.25; MM h2= 0.40; PR h2= 0.37. Coefficients determined for genetic and phenotypic correlations indicated existence of complete and positive correlations between these traits the interval of values being from rg = 0.96 between ML and MM to rg = 1.00 between ML and PR..
关键词：Holstein;Friesian first;calf heifers; cow milk yield traits; animal model; heritability; genetic correlations