Interrelationships of nutrition, metabolic hormones and resumption of ovulation in multiparous suckled beef cows on subtropical pastures

F. Samadi, N. J. Phillips, D. Blache, G. B. Martin, M. J. D'Occhio*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

21 Citations (Scopus)

Abstract

The effect of nutrition before and after calving on metabolic status and the resumption of ovulation postpartum was examined in multiparous sucked beef cows on subtropical pastures. At 6-7 months of gestation, Droughtmaster cows were randomly assigned on body weight (BW) and stage of gestation to two groups that received either standard subtropical pasture (SP, n=7,543 +/- 12 kg BW) or improved pasture (IP, n=7,564 +/- 12 kg BW). The two nutritional treatments were maintained after calving. Starting at 1 week after calving, cows were monitored for BW and body condition score (BCS, biweekly) and for circulating concentrations of insulin, glucose, IGF-1, GH and leptin (weekly). Ovarian follicular status was monitored weekly by trans-rectal ultrasonography. Fecal samples were obtained at 3-week intervals to ascertain percentage crude protein (%CP) and dry matter digestibility (DMD) of pastures. Crude protein and DMD were greater (P

Original languageEnglish
Pages (from-to)137-144
Number of pages8
JournalAnimal Reproduction Science
Volume137
Issue number3-4
DOIs
Publication statusPublished - Mar 2013

Structured keywords

  • WUN

Keywords

  • Postpartum
  • Nutrition
  • Metabolic hormones
  • Ovulation
  • Beef cow
  • GROWTH-FACTOR-I
  • DIETARY ENERGY RESTRICTION
  • BODY CONDITION SCORE
  • DAIRY-COWS
  • REPRODUCTIVE-PERFORMANCE
  • FOLLICULAR DEVELOPMENT
  • LUTEINIZING-HORMONE
  • POSTPARTUM ANESTRUS
  • BOVINE GRANULOSA
  • FATTY-ACIDS

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