English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The current study reports, for the first time, the genetic parameters and  genetic, phenotypic and environmental correlations and trends of reproductive  traits in Arabi sheep. Data were collected at Animal Science Research Station  of Khuzestan Ramin Agricultural and Natural Resources University  (ASRSKRANRU), south-west of Iran from 2001 to 2008. Litter size at birth  (LSB), litter size at weaning (LSW), litter mean weight per lamb born  (LMWLB), litter mean weight per lamb weaned (LMWLW), total litter weight at  birth (TLWB) and total litter weight at weaning (TLWW) averaged 1.11 lambs,  1.01 lambs, 3.83 kg, 19.43 kg, 4.16 kg and 20.12 kg, respectively. Genetic  parameters and correlations were estimated with univariate and bivariate  models using restricted maximum likelihood, breeding values of animals were  estimated with best linear unbiased prediction (BLUP) and genetic- and  phenotypic trends by regression of ewes’ average breeding values and  phenotypic least square means on year of birth respectively. Random effects  were fitted by additive direct genetic effects and permanent environment  related to the ewe as well as service sire effects, in addition to fixed  effects of ewe age at lambing and lambing year. Heritability estimates of  0.05, 0.02, 0.13, 0.12, 0.04, and 0.06, and repeatability estimates of 0.08,  0.06, 0.17, 0.16, 0.14 and 0.21 for the six traits, respectively. Genetic  correlations between traits varied from −0.82 to 0.94. Phenotypic  correlations were lower, ranging from −0.33 to 0.52. Estimated annual genetic  progress was very low; −0.003 lambs for LSW and 15 g for TLWW. Annual  phenotypic trend was only significant for LSW being 0.007 lambs. The study  concluded that indirect selection based on total litter weight at weaning  could be efficient for the traits studied.

Genetic parameters and genetic gains for reproductive traits of Arabi sheep