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Factors affecting the fertility of ewes after intrauterine insemination with frozen-thawed semen during the non-breeding season.
MedLine Citation:
PMID:  20519831     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
In this study, two successive field trials were conducted during the non-breeding season to investigate various factors affecting on fertility of Suffolk ewes after intrauterine insemination with frozen-thawed semen. In the first year (Experiment 1), three sperm numbers per insemination dose (0.25, 0.5 and 1 million sperm) and five sheep farms were used, and in the second year (Experiment 2), parity, age, body weight, body condition score (BCS) and postpartum days were investigated to compare pregnancy and lambing rates. High pregnancy and lambing rates (70.6 and 70.6%, respectively) were obtained with 0.25 million sperm per dose. There were no significant differences in the pregnancy and lambing rates among the five farms, but there was a tendency for one farm to have higher pregnancy (75.8%, P=0.065) and lambing (72.7%, P=0.077) rates than those (46.7-53.3% and 45.2-53.3% for the pregnancy and lambing rates, respectively) of the other farms. In Experiment 2, ewe age significantly affected both the pregnancy and lambing rates. Nulliparous ewes had a higher lambing rate (72.0%) than that (44.2%) of multiparous ewes, but a significant difference was not revealed. Regardless of body weight, BCS tended to be an important factor influencing on fertility of ewes. Body weight and the postpartum days did not affect the fertility of ewes. It was concluded from these results that the fertility of Suffolk ewes after intrauterine insemination with frozen semen was significantly influenced by sperm number per dose and ewe age. Nulliparous ewes at less than three years of age and with a BCS of more than 3.0 are expected to have higher fertility than other ewes.
Authors:
Yutaka Fukui; Hirohide Kohno; Kentaro Okabe; Sara Katsuki; Masahiro Yoshizawa; Tetsuro Togari; Hiroyuki Watanabe
Publication Detail:
Type:  Journal Article     Date:  2010-06-01
Journal Detail:
Title:  The Journal of reproduction and development     Volume:  56     ISSN:  0916-8818     ISO Abbreviation:  J. Reprod. Dev.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-09-06     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9438792     Medline TA:  J Reprod Dev     Country:  Japan    
Other Details:
Languages:  eng     Pagination:  460-6     Citation Subset:  IM    
Affiliation:
Laboratory of Animal Reproduction, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Japan. fukui@obihiro.ac.jp
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