Document Detail

Pregnancy development from day 28 to 42 of gestation in postpartum Holstein cows that were either milked (lactating) or not milked (not lactating) after calving.
MedLine Citation:
PMID:  22383714     Owner:  NLM     Status:  Publisher    
The objective was to determine if lactation affects fetal and placental development from day 28 to 42 of gestation. Bos taurus Holstein cows were assigned to one of two treatments immediately after parturition (lactating (n = 23) or nonlactating (dried off immediately after calving; n = 20)). Cows were inseminated at approximately 60 day postpartum with semen from a single ejaculate. Pregnant cows were slaughtered at one of three days of gestation (days 28, 35, or 42) and tissues were collected. The interval to first insemination, services per conception, and days to pregnancy were similar for lactating and nonlactating cows. Lactating cows had greater plasma growth hormone and NEFA. Nonlactating cows had greater plasma glucose, insulin, and IGF1. There was no effect of lactation on plasma progesterone or estradiol concentrations. Lactation had a negative effect on the weight of the fetus and placenta (weights were less in lactating cows). Fetuses collected from cows that became pregnant after first insemination were heavier than fetuses collected from cows that became pregnant after second or third inseminations. Pregnancy after first insemination was associated with greater blood glucose and IGF1 during the first 30 days postpartum. The conclusions were lactation negatively affects the growth of fetal and placental tissue perhaps through a mechanism that involves hormones and metabolites that are affected by lactation. Fetal growth within cows conceiving to first insemination compared with second or third insemination was more rapid and was associated with greater blood glucose and IGF1 early postpartum (before day 30).
Jacob C Green; Joseph P Meyer; Amanda M Williams; Emily M Newsom; Duane H Keisler; Matthew C Lucy
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-3-1
Journal Detail:
Title:  Reproduction (Cambridge, England)     Volume:  -     ISSN:  1741-7899     ISO Abbreviation:  -     Publication Date:  2012 Mar 
Date Detail:
Created Date:  2012-3-2     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100966036     Medline TA:  Reproduction     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
J Green, Animal Science, University of Missouri, Columbia, United States.
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