THE EFFECT OF INSEMINATION TIMING ON FERTILIZATION AND EMBRYO GENDER IN ZARAIBI GOATS | ||||
| Egyptian Journal of Sheep and Goats Sciences | ||||
| Article 26, Volume 5, Issue 1, April 2010, Page 1-12 PDF (199.35 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/ejsgs.2010.27375 | ||||
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| Authors | ||||
| Khalifa , E. I.; Ahmed, M. E.; Abdel- Gawad, A. M; El-Zelaky, O. A. | ||||
| Agriculture Research Center, Animal Production Research Institute, Dokki, Giza, Egypt. | ||||
| Abstract | ||||
| SUMMARY The purpose of this study was to evaluate the effect of pH of cervical mucus and vaginal temperatures from onset of oestrus up to insemination time on sex ratio in Zaraibi goats. Three Zaraibi bucks were used for semen collection. Semen was evaluated and immediately diluted with tris-yolk fructose (TYF) extender. Nanny goats (n=44) were artificially inseminated with 1 ml extended semen containing 600x106 motile spermatozoa. Nanny goats were allocated into four groups (11 females each). The interval time to estimate pH of cervical mucus and vaginal temperatures during oestrus period was 6 hrs. Artificial insemination was performed as following: group (G1) goats were artificially inseminated at onset of oestrus (zero time) which considered as control group. The groups G2, G3 and G4 were artificially inseminated at 12, 24 and 36 hours (hrs) after beginning of heat , respectively. Oestrus was detected eight times daily with three hours interval and determined when doe stand to be mounted. The results indicated that the lowest (P<0.05) value of pH of cervical mucus and vaginal temperatures were recorded at 24 and 30 hours of heat. The kidding rates were 54.5, 81.8, 100 and 100 in groups 1, 2, 3 and 4, respectively. Goats inseminated at 0 hr (G1) gave 50% males and 50% females. Goats inseminated at 12 hr produced 62.50% males and 37.50% females. The highest female ratio of offspring (84.62% vs. 15.38% male) were obtained in G3. In contrast, G4 recorded 73.08% male and 26.92% female kids. It is proved that the period between onset of oestrus to insemination time is able to alter forward motility for either X or Y chromosomes to change the sex kind of fetal gender in Zaraibi nanny goats. | ||||
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