mohammad razm kabir; ardeshir nejati javaremi; mohammad moradi shahr babak; amir rashidi; mohammad bagher sayad nejad
Volume 40, Issue 1 , June 2009
Abstract
Data related to Holstein dairy cattle from 1987 to 2004 were obtained from Animal Breeding Center of Iran to estimate the genetic and phenotypic trends. Variance components and genetic parameters of the first lactation records were estimated using Restricted Maximum Likelihood Method and AIREML algorithm ...
Read More
Data related to Holstein dairy cattle from 1987 to 2004 were obtained from Animal Breeding Center of Iran to estimate the genetic and phenotypic trends. Variance components and genetic parameters of the first lactation records were estimated using Restricted Maximum Likelihood Method and AIREML algorithm through MATVEC program. Animal breeding values were predicted through multiple-trait animal model. Estimates of heritability for milk, fat and protein yields were 0.27, 0.22 and 0.25, respectively. Genetic trend was estimated as the linear regression of BLUPs of the breeding values of animals on the birth year. The estimate of genetic trend for milk yield was 33.84±2.10kg, for fat yield 0.64±0.05kg and for protein yield it was 1.00±0.08kg. Average phenotypic trend for milk, fat and protein yields were 122.28, 4.42 and 3.06 kg, respectively. Acceptable genetic improvement for milk yield, while low genetic trends for fat and protein yield were observed in Holstein cattle in Iran.
mohammad ali talebi; seyed reza miraii ashtiani; mohammad moradi shahr babak; ardeshir nejati javaremi
Volume 39, Issue 1 , February 2009
mohammad ali rajaii arbabi; hossein omrani; siroos amiri nia; rasoul vaez torshizi; ardeshir nejati javaremi; saied esmail khanian; amir mir hadi
Volume 39, Issue 1 , February 2009
Abstract
Proliferation trend and polymorphism in 8 microsatellite dinucleotidalloci, a characteristic of Japanese quail, were described in the present study. The primers concerned were tested in 200 birds from Bonab Research Station. Samples were taken from four strains of Pharach, Golden, Tuxedo, and Panda. ...
Read More
Proliferation trend and polymorphism in 8 microsatellite dinucleotidalloci, a characteristic of Japanese quail, were described in the present study. The primers concerned were tested in 200 birds from Bonab Research Station. Samples were taken from four strains of Pharach, Golden, Tuxedo, and Panda. In total, all loci were polymorphic, except for GUJ0001 and GUJ0041 in respective strains of Panda and Tuxedo which were monomorphic. Various interpopulation variability parameters were studied for the tudy population. The average heterozygosity for all loci was 0.366. Furthermore the average rate of heterozygosity, without an inclusion of monomorphic loci, was estimated as 0.374. Maximum and minimum polymorphism Information content (PIC) and Shannon Information Index (I) were respectively obtained for GUJ0059 and GUJ0001 loci. Results indicate that in spite of selection for successive years along with closed mating system, there still exists a rather high level of polymorphism in the study population.
