Document Detail

Effect of insulin on feed intake and reproductive performance of well-nourished nulliparous ewes.
MedLine Citation:
PMID:  11131323     Owner:  NLM     Status:  MEDLINE    
Eighty-four nulliparous ewes were used to examine the effect of short-term insulin treatment on feed intake and reproductive performance. Following estrus synchronization, ewes were observed for estrus (= Day 0) and were penned individually beginning on Day 7. Ewes were fed twice daily and feed intake was recorded. On Days 9 through 13, ewes were treated s.c. with 1 IU/kg BW insulin (n = 44) or an equivalent volume of saline (n = 40). On Day 14, ewes were placed with fertile rams and number of ewes in estrus (bred) was recorded. Thirty days post-breeding, ewes were checked for pregnancy via ultrasonography. Feed intake and percentage of ewes in estrus did not differ between saline- and insulin-treated ewes. Similarly, neither pregnancy rate (69 +/- 8.7% vs. 80 +/- 8.1%, respectively) nor lambing rate (61 +/- 8.9% vs. 78 +/- 8.4%, respectively) differed between treatments. The number of lambs born per ewe was, however influenced by a breed-group effect (P < 0.0002). Romanov ewes had more (P < 0.001) lambs than the other breed groups in the study. Therefore, treating well-nourished, nulliparous ewe lambs with insulin did not increase reproductive efficiency, possibly because the ewes were already at a maximal nutritional and/or reproductive state.
N C Whitley; E L McFadin-Buff; D H Keisler
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Theriogenology     Volume:  54     ISSN:  0093-691X     ISO Abbreviation:  Theriogenology     Publication Date:  2000 Oct 
Date Detail:
Created Date:  2000-12-22     Completed Date:  2001-02-15     Revised Date:  2008-11-21    
Medline Journal Info:
Nlm Unique ID:  0421510     Medline TA:  Theriogenology     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1049-54     Citation Subset:  IM    
Department of Animal Sciences, University of Missouri, Columbia 65211, USA.
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MeSH Terms
Animal Nutritional Physiological Phenomena*
Eating / drug effects*
Estrus Synchronization
Insulin / pharmacology*
Reproduction / drug effects*
Sheep / physiology*
Species Specificity
Reg. No./Substance:

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