Document Type : Research Paper
Authors
Ferdowsi University
Abstract
The objective of this study was to investigate the effects of season and age at first calving on parameters of Wood function in fitting lactation curves (such as persistency, peak time and peak yield) of primiparous Iranian Holsteins. A total of 580,980 test day records from 953 herds recorded on 58,098 cows calved between 1990 and 2012, were analyzed. Genetic analysis was performed in a univariate animal model using DMU package. The results showed that the effects of herd, year and season of calving, age at first calving and Holstein gene percentage on lactation curve parameters were significant (P<0.01). The maximum and minimum frequency of atypical lactation curves were observed in spring-summer seasons and autumn-winter seasons, respectively. The heritabilities of lactation curve parameters were low to medium (ranging from 0.03 to 0.26). The genetic trend for 305-d milk yield, partial production from days, 5-100, 101-200 and 201-305, peak time and peak yield were positive and significant (P<0.05). Cows calving in spring and winter, had earlier and later peak time and had the least and highest persistency, respectively. Younger cows had higher persistency and later peak time occurred as well as lactation curves were less atypical, therefore, the suitable season and optimum first age at calving are winter and 24 months of age in Iranian Holsteins cows.
Keywords: genetic analysis, lactation curve, season and age at first calving, Iranian Holstein cows
Keywords
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