RT Journal
T1 MGENETIC EVALUATION OF COMPOSITE REPRODUCTIVE TRAITS IN GHEZEL SHEEP H. Baneh1,* and J. Ahmadpanah2
A1 H. Baneh
A1 J. Ahmadpanah
JF Journal of Animal and Plant Sciences
JO JAPS
SN 1018-7081
VO 30
IS 1
SP 239
OP 245
YR 2020
FD 2020/01/02
DO DOI https://doi.org/10.36899/JAPS.2020.1.0027
AB <p>This study was carried out to estimate genetic parameters and trends for reproductive performances of Ghezel sheep. The traits included in the analyses were litter size at birth (LSB) and weaning (LSW), and litter mean weight per lamb born (LMWLB) and weaned (LMWLW) as basic traits, and total litter weight at birth (TLWB) and weaning (TLWW) as composite traits. Direct genetic trends were obtained by regressing means of predicted breeding values from the best model on birth year. Direct heritability estimates for LSB, TLWB, LMWLB, LSW, TLWW and LMWLW were 0.06, 0.04, 0.06, 0.01, 0.06 and 0.06, respectively. The permanent environmental effect was significant for LSW (0.09) and TLWB (0.04) and the service sire effect (0.14) influenced TLWB. Effects of service sire were highly significant (P&lt;0.01) for LSB, TLWB, LMWLB, TLWW and LMWLW traits; proportions of phenotypic variance explained by the service sire effect were 0.03, 0.14, 0.21, 0.25 and 0.33, respectively. A significant genetic trend was found only for LMWLB (P&lt;0.05).These results suggested that inclusion of permanent environmental and service sire effects in the model for ewe productivity traits may improve the accuracy of genetic evaluation. Also, improvement of reproductive traits in this breed may be achieved by selecting the elite rams.</p>
K1 Ghezel sheep, genetic evaluation, reproductive performance, service sire effect, REML
PB Pakistan Agricultural Scientists Forum
LK https://thejaps.org.pk/AbstractView.aspx?mid=AS-17-0180