Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies

Milk production in Thailand has been growing into an important agricultural sector, but it still faces numerous difficulties in environmental constraints. The main intention of this study was to identify significant environmental effects on production and fertility traits to give advices for farm ma...

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Main Authors: Sven König, Nattaphon Chongkasikit, Hans Jürgen Langholz
Format: Journal
Published: 2018
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http://cmuir.cmu.ac.th/jspui/handle/6653943832/62015
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Institution: Chiang Mai University
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spelling th-cmuir.6653943832-620152018-09-11T09:20:56Z Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies Sven König Nattaphon Chongkasikit Hans Jürgen Langholz Agricultural and Biological Sciences Milk production in Thailand has been growing into an important agricultural sector, but it still faces numerous difficulties in environmental constraints. The main intention of this study was to identify significant environmental effects on production and fertility traits to give advices for farm management. Additionally, adjusting records for environmental impact is essential to define appropriate models for estimation of variance components and improving selection procedures. The data consists of production and reproduction records and body measurements from 2764 Holstein upgrade cows in 252 farms. With a body weight of 415 kg and a production level of 3668 kg milk Thai Holsteins only reach approximately 60 % of performances of Holsteins in temperate zones. Percentages of Holstein genes of cows and quality of roughage sources showed a certain effect on calving interval and services per conception but not on milk performances. Despite seasonal effects were not very pronounced on milk yield, there was a strong interaction between years and calving seasons. Estimates of variance components applying REML and animal models were in the range as expected, i.e. heritabilities for production traits between 0.34 and 0.37, for fertility lower than 0.03 and for body weight 0.46. Genetic correlations between fertility and production traits were near zero. Economic weights for milk yield and calving interval were derived as first derivation of profit functions and used for selection index calculations. Success in fertility is possible if at least 130 daughters per bull are recorded and if fertility is a part of index sources. 2018-09-11T09:20:56Z 2018-09-11T09:20:56Z 2005-06-23 Journal 00039438 2-s2.0-20444406115 https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=20444406115&origin=inward http://cmuir.cmu.ac.th/jspui/handle/6653943832/62015
institution Chiang Mai University
building Chiang Mai University Library
country Thailand
collection CMU Intellectual Repository
topic Agricultural and Biological Sciences
spellingShingle Agricultural and Biological Sciences
Sven König
Nattaphon Chongkasikit
Hans Jürgen Langholz
Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies
description Milk production in Thailand has been growing into an important agricultural sector, but it still faces numerous difficulties in environmental constraints. The main intention of this study was to identify significant environmental effects on production and fertility traits to give advices for farm management. Additionally, adjusting records for environmental impact is essential to define appropriate models for estimation of variance components and improving selection procedures. The data consists of production and reproduction records and body measurements from 2764 Holstein upgrade cows in 252 farms. With a body weight of 415 kg and a production level of 3668 kg milk Thai Holsteins only reach approximately 60 % of performances of Holsteins in temperate zones. Percentages of Holstein genes of cows and quality of roughage sources showed a certain effect on calving interval and services per conception but not on milk performances. Despite seasonal effects were not very pronounced on milk yield, there was a strong interaction between years and calving seasons. Estimates of variance components applying REML and animal models were in the range as expected, i.e. heritabilities for production traits between 0.34 and 0.37, for fertility lower than 0.03 and for body weight 0.46. Genetic correlations between fertility and production traits were near zero. Economic weights for milk yield and calving interval were derived as first derivation of profit functions and used for selection index calculations. Success in fertility is possible if at least 130 daughters per bull are recorded and if fertility is a part of index sources.
format Journal
author Sven König
Nattaphon Chongkasikit
Hans Jürgen Langholz
author_facet Sven König
Nattaphon Chongkasikit
Hans Jürgen Langholz
author_sort Sven König
title Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies
title_short Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies
title_full Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies
title_fullStr Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies
title_full_unstemmed Estimation of variance components for production and fertility traits in Northern Thai dairy cattle to define optimal breeding strategies
title_sort estimation of variance components for production and fertility traits in northern thai dairy cattle to define optimal breeding strategies
publishDate 2018
url https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=20444406115&origin=inward
http://cmuir.cmu.ac.th/jspui/handle/6653943832/62015
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