2020
DOI: 10.21608/jappmu.2020.133812
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Maternal Genetic Effect on Expected Genetic Response of Selection Indices for Milk Production of Friesian Cows in Egypt

Abstract: The present study aimed to estimate the genetic parameters of first lactation milk yield (FLMY), first lactation period (FLP), first dry period (FDP) and first calving interval (FCI) and inclusion these studied traits in selection indices through different animal models. The data utilized in this study were obtained from 1821 normal first lactation of Friesian cows belong to Sakha and EI-Karada Experimental stations of Animal Production Research Institute (APRI), Dokki, Cairo, Egypt. Data were collected during… Show more

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“…Table(2) Estimates of variance components and genetic parameters for studied traits through Animal Model for Friesian (F), Native (N) and Crosses (FxN) cows in Egypt. a = direct heritability, c 2 = fraction of phenotypic variance due to maternal permanent environmental effects and e 2 = fraction of phenotypic variance due to residual effects.Faid-Allah (2015)reported direct heritability values of 0.112 for LP (lactation period) and 0.105 for DO (days open).…”
mentioning
confidence: 99%
“…Table(2) Estimates of variance components and genetic parameters for studied traits through Animal Model for Friesian (F), Native (N) and Crosses (FxN) cows in Egypt. a = direct heritability, c 2 = fraction of phenotypic variance due to maternal permanent environmental effects and e 2 = fraction of phenotypic variance due to residual effects.Faid-Allah (2015)reported direct heritability values of 0.112 for LP (lactation period) and 0.105 for DO (days open).…”
mentioning
confidence: 99%