Document Detail

Factors affecting fertility after cervical insemination with cooled semen in meat sheep.
MedLine Citation:
PMID:  22664264     Owner:  NLM     Status:  Publisher    
Field results of 18,328 cervical artificial inseminations (AI) with cooled semen in Rasa Aragonesa meat sheep under field conditions in north-eastern Spain AI were analyzed. Logistic regression procedures were used including fertility at AI as the dependent variable (measured by lambing, 0 or 1) and year, month of AI, farm, hours between extraction and insemination, number of ewes inseminated in a set of AI, parity, lambing-treatment interval, total number of synchronization treatment per ewe, inseminating ram and AI technician as independent factors. Previous parturitions, lambing-AI interval, month, farm, inseminating ram and technician were factors with significant impact on AI fertility. Based on the odds ratio, the likelihood of pregnancy decreased: in ewes with more than five previous parturitions (by a factor of 0.87, 0.79 and 0.66 for the 6th, 7th and ≥8 parturitions, respectively); in ewes with lambing-AI interval higher than 240 days (by a factor of 0.8); and for inseminations performed during the spring period, (March, April, May and June, 0.70, 0.76, 0.66, and 0.76, respectively). We noted a higher fertility in seven inseminating rams (odds ratios between 1.4 and 1.7) and lower in two rams (odds ratios between 0.6 and 0.7). Of the 17 AI technicians, two were related to fertilities improved by odds ratio of 1.6, and 1.30, whereas two technicians were attributed fertility rates reduced by odds ratios of 0.68 and 0.40. These findings should be taken into account to evaluate the AI technique performance and make decisions to enhance fertility results.
I Palacín; J L Yániz; E Fantova; M E Blasco; F J Quintín-Casorrán; E Sevilla-Mur; P Santolaria
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-5-17
Journal Detail:
Title:  Animal reproduction science     Volume:  -     ISSN:  1873-2232     ISO Abbreviation:  -     Publication Date:  2012 May 
Date Detail:
Created Date:  2012-6-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7807205     Medline TA:  Anim Reprod Sci     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 Elsevier B.V. All rights reserved.
Departamento de Producción Animal y Ciencia de los Alimentos, Escuela Politécnica Superior, Universidad de Zaragoza, Huesca, Spain.
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