Staff Publications

Staff Publications

  • external user (warningwarning)
  • Log in as
  • language uk
  • About

    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

    We have a manual that explains all the features 

Record number 322444
Title Acute fasting in heifers as a model for assessing the relationship between plasma and follicular fluid NEFA concentrations.
Author(s) Jorritsma, R.; Groot, M.W. de; Vos, P.L.A.M.; Kruip, T.A.M.; Wensing, T.; Noordhuizen, J.P.T.M.
Source Theriogenology 60 (2003)1. - ISSN 0093-691X - p. 151 - 161.
DOI https://doi.org/10.1016/S0093-691X(02)01358-4
Department(s) ID - Dier en Omgeving
Publication type Refereed Article in a scientific journal
Publication year 2003
Keyword(s) growth-factor-i - preovulatory lh surge - energy-balance - dairy-cows - beef heifers - ovarian follicle - bovine follicles - milk-production - body condition - holstein cows
Abstract It is known from epidemiological studies that negative energy balance in early lactating dairy cows is related to a depression in reproductive performance. Elevated plasma concentrations of non-esterified fatty acids (NEFA) are a typical metabolic characteristic of these animals and are proposed as the possible link. The suggestion is that NEFA might have a direct effect on the ovary, by affecting development of the oocyte or the granulosa cells. However, no data is available concerning the relationship between the concentration of NEFA in follicular fluid and plasma. Therefore, a cross-over study with 10 heifers around 15 months of age was conducted to analyze this relationship and examine the suggested effects of the negative energy balance on follicular growth. Investigation of these effects was performed on fasted heifers. The experimental treatment consisted of feeding hay with a subsequent period of fasting, to induce elevated plasma NEFA concentrations. Sampling of follicular fluid was performed using transvaginal aspiration of follicles, which were standardized using a synchronization protocol. In addition, concentrations of glucose, insulin, NEFA, and estradiol were measured in plasma. Follicular estradiol and progesterone concentrations were also measured to assess the quality of the dominant follicle. Fasting resulted in significantly lower plasma glucose (P=0.0006) and plasma insulin (P
Comments
There are no comments yet. You can post the first one!
Post a comment
 
Please log in to use this service. Login as Wageningen University & Research user or guest user in upper right hand corner of this page.