CROSSBREEDING COMPONENTS FOR SOME SEMEN PARAMETERS OF BUCKS OBTAINED FROM CROSSING SAUDI ARADI GOATS WITH DAMASCUS | ||||
| Egyptian Journal of Sheep and Goats Sciences | ||||
| Article 11, Volume 5, Issue 1, April 2010, Page 1-12 PDF (222.09 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejsgs.2010.27360 | ||||
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| Authors | ||||
| Al-Sobayil, K. A.; M. F. El-Zarei; A. M. Al-Saef; M. M. Zeitoun; M. H. Khalil | ||||
| Department of Animal Production & Breeding, College of Agriculture & Veterinary Medicine, Qassim University, Buriedah 51452 P.O. Box 6622, Al-Qassim, Saudi Arabia. | ||||
| Abstract | ||||
| ABSTRACT A crossbreeding program between Aradi Saudi breed (A) with Syrian Damascus breed (D) was practiced for three years to produce ½D½A genotype. A total number of 191 ejaculates collected from 42 bucks fathered by 12 sires and mothered by 42 dams were used to evaluate semen characteristics of bucks. An animal model was used to estimate heritabilities and permanent environmental effects and variance components obtained by this animal model were used to solve the corresponding mixed model equations, obtaining solutions for the genetic group means and their standard errors. A generalized least square procedure was used to estimate direct additive genetic effects and direct heterosis. Heritabilities obtained for semen characteristics were mostly moderate or low and ranged from 0.04 to 0.16. Direct additive effects were in favor of Aradi bucks by 11.4% for ejaculate volume, 4.2% for live sperms and 5.7% for total sperm output relative to Damascus bucks, while a reverse trend in favor of Damascus bucks was recorded for sperms concentration (-3.6%), total motility of sperms (- 15.0%), and dead sperms (24.5%). Positive and significant estimates of direct heterosis for volume of ejaculate (16.3%), total sperms output (12.5%), sperms concentration (5.4 %) along with a negative estimate recorded for abnormal sperms percentage (- 3.3%) were favorable for crossbred bucks; i.e. crossing Saudi Aradi does with Damascus bucks was associated with an increase in ejaculate volume (0.245 ml, P<0.01) and sperm concentration (0.15 x 109 per ml, P<0.05) along with a reduction in percentage of abnormal sperms (-0.45 %, P<0.05). | ||||
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