Methods for estimation of daily and lactation milk yields from alternative milk recording scheme in Holstein and Simmental cattle breeds
作者: Krešimir KuterovacNikola RagužMartino CassandroMarija KlopčičSonja JovanovacVesna Gantner
刊名: Italian Journal of Animal Science, 2010, Vol.8 (4), pp.519-530
来源数据库: Directory of Open Access Journals
DOI: 10.4081/ijas.2009.519
关键词: Holstein and Simmental cattleAlternating morning-evening milkingsDaily (24 h) milk yields305-day lactation milk yieldsEstimation.
原始语种摘要: The aim of this study was to compare different statistical methods for the estimation of daily and 305-day lactation milk, fat and protein yields of Holstein and Simmental cattle breeds using an alternative milk recording scheme. Data included 6,824 individual test-day milk yield records collected according to the A4 milk recording method on 668 cows reared on 15 family farms. Daily milk, fat and protein yields were estimated using several statistical methods with regard to breed. The 305-day lactation yields were calculated from estimated daily yields using the Test Interval Method. The correlation between estimated and true yields, as well as the mean difference among estimated and true yield were used as the evaluation criteria for estimation methods. The linear regression of daily to...
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关键词翻译
关键词翻译
  • lactation 哺乳
  • cattle 
  • estimation 估计
  • daily 每天的
  • evening 晚上
  • protein 蛋白质
  • estimated 估计的
  • records 案卷
  • breed 饲养
  • according 按照