Effects of season and age at first calving on genetic and phenotypic characteristics of lactation curve parameters in Holstein cows

Journal of Animal Science and Technology
Mahdi Elahi Torshizi

Abstract

In this research data representing 72,946 primiparous cows from 724 herds with 638,063 total test day records calved between 2001 and 2011. These data were analysed to determine the effect of age at first and season of calving on parameters of the Wood lactation curve. Also, genetic trend of the lactation curve parameters in different calving years were evaluated. The results indicate that the highest rate of atypical lactation curve was related to cows that calved in summer (28.05 %). The maximum phenotypic relationship between initial milk yield and total 305-d milk yield was observed in cows calved in spring (0.40). The role of peak yield is more than peak time on 305-d total milk yield in primiparous Holstein. One month increase in age at first calving from 18 to 26 month raised 305-d milk yield by around 138 kg and from 27 to 32 month decreased by 61 kg. The persistency of lactation between 101 and 200 days is higher than that of 201-305 days. Our results indicate that the shape of lactation curve is largely dependent on the season of calving (higher level of milk production in cows which calved in autumn and winter). The heritabilities of parameters of lactation curve and persistency measures were low. The genetic trends ...Continue Reading

References

Jun 1, 1992·Journal of Dairy Science·T L StantonS D Kachman
Apr 1, 1988·Journal of Dairy Science·K C BachmanC J Wilcox
Jun 1, 1996·Journal of Dairy Science·M S Khan, G E Shook
Apr 5, 2001·Journal of Dairy Science·J BewleyD B Jackson-Smith
Mar 1, 2008·Animal : an International Journal of Animal Bioscience·H LeclercV Ducrocq

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Citations

Feb 7, 2022·Tropical Animal Health and Production·Ricardo Zamorano-AlgandarPablo Luna-Nevárez

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