EFFECTIVENESS OF DIFFERENT PROTOCOLS FOR INDUCING ESTRUS OF ARDY GOATS DURING THE NON-BREEDING SEASON. | ||
| Journal of Animal and Poultry Production | ||
| Article 2, Volume 1, Issue 2, February 2010, Pages 35-44 PDF (322.32 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jappmu.2010.86091 | ||
| Author | ||
| K. A. Sobayil* | ||
| Dept. of Animal Production and Breeding, Fac. of Agric. and Veterinary Medicine, Univ. of Al-Qassim, P.O. Box 6622, Buriedah 51452, Kingdom of Saudi Arabia | ||
| Abstract | ||
| The experiment was conducted to determine the reproductive performance (kidding rate and litter size) of estrus synchronized local Ardy goats after different protocols and trans-cervical artificial insemination (TC-AI). This experiment was conducted at the beginning of their non-breeding season. Total of 90 Ardy does were randomly allotted into 6 similar groups of 15 in each and treated as the following: group 1: does were synchronized with a controlled intra-vaginal devices release (CIDR) for 14 days + injecting (i.m.) 600 i.u. of equine Chorionic Gonadotrophins (eCG) at withdrawal time; group 2: does were received two doses (10 mg/dose) of PGF2α at 11 days apart; group 3: does were treated with insertion of progesterone sponges for 14 days + injecting 600 i.u. of eCG at withdrawal time; group 4: does were treated with GPG method (day 1: the does were given a dose of 25 µg of GnRH (Cystorelin) ; each doe was injected with 10 mg ofPGF2α on day 7 and at the 2nd GnRH dose on day 9; group 5: does were synchronized naturally by using male effect where a teaser ram was introduced to the does and left with them for 20 days; and group 6 (control): does did not receive any hormonal treatment and were left for 20 days with a tested fertile buck. All synchronized does were trans-cervically inseminated (TC-AI) with diluted semen of Ardy bucks. The pregnancy was diagnosed by ultrasonic examination on 40 days post insemination. Results showed that does in G1 and G3 showed clear estrus approximately 36 hours post CIDR and sponge removal and were 8 and 12 hours earlier than those in G4, and G2, respectively. Percentages of does kidded were 53.33, 13.33, 40.00, 20.00, 6.67 and 00.00% in G1, G2, G3, G4, G5 and G6, respectively, and the differences were significant (P<0.05). Multiple birth percentages were 13.33, 00.00, 13.33, 6.66, 00.00 and 00.00% per does kidded in the respective groups. Injecting does with eCG in G1 and G3 at the time of pessary withdrawal was associated with fruitful improvements in the kidding rates. The kidding period in all hormonal-treated does was short (about 7 days) and this is an advantage for synchronizing the estrus in Ardy does. | ||
| Keywords | ||
| Goats; estrous synchronization; CIDR; eCG; GnRH | ||
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