Document Detail

Factors affecting the reproductive performance of Awassi sheep flocks in north-east of Jordan: an epidemiological study.
MedLine Citation:
PMID:  19459061     Owner:  NLM     Status:  MEDLINE    
A prospective cohort study was conducted using 32 randomly selected Awassi sheep flocks to identify factors hypothesized to be associated with the occurrence of pregnancy, twinning and fetal loss between August 2005 and May 2006 in the region of Al-Safawi (northeast of Jordan). Vitamins A and E and selenium concentrations were determined on 448 blood samples. Using the forward selection procedure of the logistic regression module, models with statistically significant risk factors (P < 0.05) were constructed for three outcomes; pregnancy, twinning and fetal loss. Serum vitamin A concentration levels were associated with pregnancy (OR = 2.26, 2.48), twinning (OR = 6.49, 17.74) and fetal loss (OR = 0.13, 0.19). Primiparous ewes were 48% less likely to become pregnant than fourth or higher parity ewes. The likelihood of twinning increased significantly in ewes up to the third parity. Ewes that were fed 700-900 g barley, 250-300 g wheat-bran per head per day and grazed on vegetables residues were 4.15 times more likely to have twins than ewes that were fed 600 g barley and 200 g wheat-bran per head per day. Fetal loss in first and second parity ewes was about 3 times more likely than that in third or higher-parity ewes. Ewes pregnant with twins were about 14 times more likely to have fetal loss than ewes carrying single fetus. Pregnant ewes of the stationary flocks were 37% less likely to have fetal loss than ewes of the semi-nomadic flocks. These results demonstrate that stationary Awassi sheep flocks had higher pregnancy and twinning rates and less pregnancy loss. Supplementation of vitamin A, providing sufficient quantity of dry feed and increasing ram: ewe ratio for primiparous ewes of semi-nomadic flocks is essential to improve Awassi sheep reproductive performance.
S Q Lafi; A Q Talafha; N Giadinis; E Kalaitzakis; K Pourliotis; N Panousis
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2009-05-21
Journal Detail:
Title:  Tropical animal health and production     Volume:  41     ISSN:  1573-7438     ISO Abbreviation:  Trop Anim Health Prod     Publication Date:  2009 Dec 
Date Detail:
Created Date:  2009-11-02     Completed Date:  2010-01-27     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1277355     Medline TA:  Trop Anim Health Prod     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1755-64     Citation Subset:  IM    
Department of Pathology and Animal Health, Faculty of Veterinary Medicine, Jordan University of Science and Technology, P.O. Box 3030, Irbid, Jordan.
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MeSH Terms
Animal Feed
Animal Husbandry
Cohort Studies
Dietary Supplements
Logistic Models
Nutritional Status
Reproduction / physiology*
Sheep / physiology*
Vitamin A*
Reg. No./Substance:
11103-57-4/Vitamin A

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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