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Effect of different oestrus synchronization protocols on the reproductive efficiency of Dammar indigenous ewes in Yemen during winter


Citation

Hesam, Nasser Saleh Obad and Haron, Abd Wahid and Saharee, Abdul Aziz and Abu Bakar @ Zakaria, Md Zuki and Goriman Khan, Mohd Azam Khan and Jabbar, A. G. and Mahfoz, M. A. (2012) Effect of different oestrus synchronization protocols on the reproductive efficiency of Dammar indigenous ewes in Yemen during winter. African Journal of Biotechnology, 11 (37). art. no. 72F75CA36339. pp. 9156-9162. ISSN 1684–5315

Abstract

This study compared the effect of oestrus synchronization using controlled-internal-drug-release-device (CIDR) and equine chorionic gonadotropin (eCG) on reproductive efficiency of Dammar ewes in winter. Data of forty-one ewes were divided into two groups; for long CIDR treatment (12 days, LT, n=25) and for short CIDR treatment (6 days, ST, n=16). The LT group was further divided into 3 subgroups to receive eCG either 48 h before CIDR removal (LT1), or at CIDR removal (LT2). Nevertheless, a third subgroup (LT3) received no eCG and served as the control variable. The ST group was also divided into two subgroups to receive eCG either at CIDR removal (ST1) or to receive no eCG (ST2). Five fertile rams naturally mated the ewes. Then in terms of oestrous responses, the pregnancy and lambing rates were 100 percent (100%) in ewes for all treatments. The onset and duration of oestrous was shorter in LTa1 than the remaining subgroups. Litter size in those of LT2 and LT1 subgroups was greater than those of LT3. Additionally, litter size in those of ST1 was greater than in those of ST2 subgroup. This indicated that eCG injection affected litter size. In conclusion, these results indicated that CIDR could successfully be used for either 6 or 12 days prior to ram introduction without having to administer eCG. However, eCG is important to induce multiple births.


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Additional Metadata

Item Type: Article
Divisions: Faculty of Veterinary Medicine
DOI Number: https://doi.org/10.5897/AJB 12.265
Publisher: Academic Journals
Keywords: Oestrus synchronization; Sheep; Mating; Lambing; Winter
Depositing User: Nur Farahin Ramli
Date Deposited: 22 Nov 2013 04:15
Last Modified: 10 Nov 2017 02:41
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.5897/AJB 12.265
URI: http://psasir.upm.edu.my/id/eprint/25423
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