The lifetime production of Bovec and Improved Bovec sheep breeds

Gregor Gorjanc*, Vesna Gantner, Dragomir Kompan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Production data of Bovec and Improved (with East-Friesian) Bovec sheep born between years 1989 and 2006 were used for the analysis of culling dynamics and lifetime production. Lifetime production was calculated as the sum of production at each lambing (number of born and liveborn lambs and litter birth weight), weaning (number of weaned lambs and litter weaning weight) or during each lactation (milk yield, fat (6.5%) and protein (5.8%) corrected milk yield (FPC; Pulina et at., 2005.), and fat and protein yield) for culled sheep. Animals with any missing records from the first till the last lambing, weaning or lactation were removed from the analysis. Animals that left the system of animal recording alive, due to selling or the cancellation of recording by a breeder were also excluded. Dataset included records for 2254 sheep: 1734 of Bovec and 520 of Improved Bovec breed. Data preparation and statistical analysis were performed with the use of a statistical program R (R Development Core Team, 2007.) and additional packages Zelig (Imai et al., 2007; Bailey and Alimadhi, 2007; Imai et al., 2008) and lme4 (Bates and DebRoy, 2004; Bates, 2007). Results have shown that in the period

Original languageUndefined/Unknown
Pages (from-to)114-124
Number of pages11
JournalMljekarstvo
Volume59
Issue number2
Publication statusPublished - 2009

Keywords

  • milk sheep
  • lifetime production
  • milk yield
  • lamb
  • MILK-PRODUCTION
  • HERD LIFE
  • GENETIC-PARAMETERS
  • CANADIAN HOLSTEINS
  • DAIRY EWES
  • TRAITS

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