Effect of Dry Period Length on NEFA and IGF-I Plasma Concentrations and Postpartum Ovarian Activity Resumption in Dairy Cows

  • M. Probo
  • A. Comin
  • A. Agazzi
  • I. De Amicis
  • A. Prandi
  • F. Cairoli
Chapter

Abstract

The current study was carried out to examine the effects of dry period duration on NEFA and IGF-I plasma concentrations and postpartum ovarian activity resumption in dairy cows. Twenty-five pregnant Friesian cows (second and third lactation) were randomly assigned to one (standard dry period, 9 weeks, group C, n = 12) of two (short dry period, 5 weeks, group T, n = 13) treatments. Blood samples for NEFA and IGF-I analyses were collected once a week during the last 5 weeks prepartum and the first 14 weeks of lactation. Milk whey collection (twice/week) for progesterone analysis began 2 weeks after parturition and was used to detect ovarian activity resumption (at least three consecutive samples with P4 ≥ 300 pg/mL). The data obtained were analyzed by ANOVA for repeated data (mixed) and GLM of the SAS statistical package. Short dry periods reduced milk production (26.55 vs. 27.55 kg/day; P ≤ 0.01), without modifying milk quality. The mean interval from calving to first postpartum cycle was shorter in group T than in group C (34.5 vs. 46.9 days, P ≤ 0.01). No differences were found in NEFA plasma concentrations between groups either before or after calving, while IGF-I circulating concentrations were higher in group T than in group C during both the dry period and the first 14 weeks of lactation (P ≤ 0.01). In conclusion, the reduction in the dry period had a positive impact on metabolic balance and time of postpartum resumption of ovarian activity.

Keywords

Dairy cow Dry period IGF-I NEFA Ovarian activity 

Abbreviations

CP

Crude protein

dm

Dry matter

EE

Ether extract

IGF-I

Insulin-like growth factor I

NDF

Neutral detergent fiber

NEFA

Non-esterified fatty acids

NFC

Non fiber carbohydrate

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Copyright information

© Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • M. Probo
    • 1
  • A. Comin
    • 2
  • A. Agazzi
    • 3
  • I. De Amicis
    • 4
  • A. Prandi
    • 2
  • F. Cairoli
    • 1
  1. 1.Dipartimento di Scienze Cliniche VeterinarieUniversitá degli Studi di MilanoMilanoItaly
  2. 2.Dipartimento di Scienze degli AlimentiUniversity of UdineUdineItaly
  3. 3.Dipartimento di Scienze e Tecnologie Veterinarie per la Sicurezza AlimentareUniversitá degli Studi di MilanoMilanoItaly
  4. 4.Dipartimento di Scienze Cliniche VeterinarieUniversity of TeramoTeramoItaly

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