Document Detail

Use of bovine somatotropin in lactating dairy cows receiving timed artificial insemination.
MedLine Citation:
PMID:  10877389     Owner:  NLM     Status:  MEDLINE    
Objectives of the research were to examine the effect of bovine somatotropin (bST) on pregnancy rates to a timed artificial insemination protocol and to test a resynchronization system with two consecutive synchronized services. Lactating Holstein cows (n = 403) were assigned to the following treatments: bST treatment (500 mg) was initiated at 63 +/- 3 d postpartum concomitantly with initiation of the timed artificial insemination protocol or bST treatment was initiated at 105 +/- 3 d postpartum. At 63 +/- 3 d postpartum, all cows received GnRH (100 microg), an injection of PGF2alpha (25 mg) 7 d later, and a GnRH injection at 48 h after PGF2alpha and were inseminated 16 to 20 h later. Cows were reinseminated at detected estrus or resynchronized with a GnRH injection at 20 d after insemination. At 27 d after insemination, cows were examined for pregnancy. Resynchronized cows diagnosed nonpregnant received an injection of PGF2alpha and were inseminated at detected estrus or received an injection of GnRH at 48 h after PGF2alpha and inseminated 16 to 20 h later. Cows pregnant at d 27 were reexamined for pregnancy at 45 d after insemination. First-service pregnancy rates at d 45 were increased in cows not resynchronized that initiated bST treatment at 63 +/- 3 d postpartum, compared with cows initiating bST treatment at 105 +/- 3 d postpartum (37.7 +/- 5.8% and 22.1 +/- 4.2%, respectively), but the effect of bST treatment was not observed when cows were resynchronized (25.6 +/- 4.3% and 25.8 +/- 5.5%, respectively). Thus, bST increased pregnancy rates to a timed artificial insemination protocol.
F Moreira; C A Risco; M F Pires; J D Ambrose; M Drost; W W Thatcher
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Journal of dairy science     Volume:  83     ISSN:  0022-0302     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2000 Jun 
Date Detail:
Created Date:  2000-08-30     Completed Date:  2000-11-14     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1237-47     Citation Subset:  IM    
Department of Dairy and Poultry Sciences, University of Florida, Gainesville 32611, USA.
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MeSH Terms
Analysis of Variance
Cattle / physiology*
Dinoprost / administration & dosage
Fertility / drug effects*
Fertility Agents, Female / administration & dosage
Gonadotropin-Releasing Hormone / administration & dosage
Growth Hormone / administration & dosage,  pharmacology*
Insemination, Artificial / physiology,  veterinary*
Pregnancy Rate
Pregnancy Tests / veterinary
Progesterone / blood
Time Factors
Ultrasonography, Prenatal / veterinary
Reg. No./Substance:
0/Fertility Agents, Female; 33515-09-2/Gonadotropin-Releasing Hormone; 551-11-1/Dinoprost; 57-83-0/Progesterone; 9002-72-6/Growth Hormone

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