Effects of Sire, Dam Traits, Calf Traits, and Environment on Dystocia and Subsequent Reproduction of Two-Year-Old Heifers

D. J. Colburn, G. H. Deutscher, M. K. Nielsen, D. C. Adams

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

A study was conducted over 3 yr to evaluate effects of sire birth weight EPD, calf birth weight and shape, and heifer pelvic area and weight, individually and in combination, on dystocia and subsequent rebreeding of 2-yr-old heifers. Heifers (n = 550), MARC II yearlings, were assigned for breeding to one of four Angus sires with birth weight EPD of -.95, -.82, +2.9, and +2.7 kg. At calving, heifers were assisted as needed. A gauge attached to the calf puller recorded applied traction pressure. Analysis of traction pressure detected only slightly larger amounts of variation (2 to 3%) affecting dystocia than the standard five-point scoring system. Dam weight did not affect calving difficulty score (CDS), except dam birth weights were heavier (P < .05) for CDS 5 (Caesarean section) than CDS 1 (unassisted). Dams requiring Caesarean section had smaller pelvic areas (P < .05), with no other differences among CDS. The CDS increased as calf birth weight and calf external measurements increased. Low EPD sires produced calves with smaller (P < .05) birth weights and smaller calf head and foot circumferences and caused less dystocia than high EPD sires. The CDS did not affect subsequent pregnancy rates but did affect conception date of the second calf. Calves delivered by Caesarean section were lighter (P < .05) at weaning than other calves but had similar slaughter weights. As mean winter temperature increased (6.1°C) from yr 1 to 3, calf birth weight decreased (4.6 kg) and calving difficulty decreased 23%. Results indicate sire birth weight EPD, calf birth weight and shape, dam pelvic area, and climate affected CDS, and CDS affected subsequent conception date.

Original languageEnglish (US)
Pages (from-to)1452-1460
Number of pages9
JournalJournal of animal science
Volume75
Issue number6
DOIs
StatePublished - Jun 1997

Fingerprint

Dystocia
dystocia
dams (mothers)
Birth Weight
sires
Reproduction
heifers
calving
birth weight
calves
traction (mechanics)
cesarean section
Cesarean Section
Traction
Weights and Measures
Pressure
Pregnancy Rate
Weaning
Climate
slaughter weight

Keywords

  • Calf Measurements
  • Dystocia
  • Heifers
  • Pelvis
  • Sire Evaluation

ASJC Scopus subject areas

  • Food Science
  • Animal Science and Zoology
  • Genetics

Cite this

Effects of Sire, Dam Traits, Calf Traits, and Environment on Dystocia and Subsequent Reproduction of Two-Year-Old Heifers. / Colburn, D. J.; Deutscher, G. H.; Nielsen, M. K.; Adams, D. C.

In: Journal of animal science, Vol. 75, No. 6, 06.1997, p. 1452-1460.

Research output: Contribution to journalArticle

Colburn, D. J. ; Deutscher, G. H. ; Nielsen, M. K. ; Adams, D. C. / Effects of Sire, Dam Traits, Calf Traits, and Environment on Dystocia and Subsequent Reproduction of Two-Year-Old Heifers. In: Journal of animal science. 1997 ; Vol. 75, No. 6. pp. 1452-1460.
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