Estimation of genetic parameters and trend of somatic cell score trait using test day records in Iranian Holstein cows

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Panje Shiri Somaye; Eskandari Nasab Moradpasha; Zandi Baghcheh Maryam Mohammad Bagher; Moradi Mohammad Hossein

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Journal: Iranian Journal of Animal Science Year:2016 | Volume:47 | Issue:3 Page(s): 379-388

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Information Journal Paper

Title

Estimation of genetic parameters and trend of somatic cell score trait using test day records in Iranian Holstein cows

Author(s)

Panje Shiri Somaye | Eskandari Nasab Moradpasha | Zandi Baghcheh Maryam Mohammad Bagher | Moradi Mohammad Hossein | Issue Writer Certificate

Keywords

Gibbs samplingQ2

random regression modelQ2

somatic cell scoreQ2

teest day recordesQ1

Abstract

The objective of this research was to estimate the genetic parameters and trend of somatic cell count in Holstein cows of Iran using test day records. The phenotypic the used data consisted of were consisting of 407167 first lactation test day records the which were collected by the center of Animal Breeding and Livestock Production Improvement center of Iran during 2009 to 2013. Somatic cell count was transformed to somatic cell score using logarithm transformation method. The genetic parameters were estimated using random regression models with Bayesian statistical method based on Gibbs sampling. The results revealed that the observed trend for additive genetic variance and permanent environmental were similar high in early lactation compared to other days. The heritability was estimated between 0. 023-0. 065 for somatic cell score. Repeatability showed highest changes at the start and the end of lactation. Additive genetic correlations were estimated for days 5 and 305. The result showed high variation in genetic trend of somatic cell score in different years, without an specific trend.

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APA: Copy

Panje Shiri, Somaye, Eskandari Nasab, Moradpasha, Zandi Baghcheh Maryam, Mohammad Bagher, & Moradi, Mohammad Hossein. (2016). Estimation of genetic parameters and trend of somatic cell score trait using test day records in Iranian Holstein cows. IRANIAN JOURNAL OF ANIMAL SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES), 47(3 ), 379-388. SID. https://sid.ir/paper/193541/en

Vancouver: Copy

Panje Shiri Somaye, Eskandari Nasab Moradpasha, Zandi Baghcheh Maryam Mohammad Bagher, Moradi Mohammad Hossein. Estimation of genetic parameters and trend of somatic cell score trait using test day records in Iranian Holstein cows. IRANIAN JOURNAL OF ANIMAL SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES)[Internet]. 2016;47(3 ):379-388. Available from: https://sid.ir/paper/193541/en

IEEE: Copy

Somaye Panje Shiri, Moradpasha Eskandari Nasab, Mohammad Bagher Zandi Baghcheh Maryam, and Mohammad Hossein Moradi, “Estimation of genetic parameters and trend of somatic cell score trait using test day records in Iranian Holstein cows,” IRANIAN JOURNAL OF ANIMAL SCIENCE (IRANIAN JOURNAL OF AGRICULTURAL SCIENCES), vol. 47, no. 3 , pp. 379–388, 2016, [Online]. Available: https://sid.ir/paper/193541/en

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