Article Text

PDF
Risk factors for perinatal and postnatal mortality in lambs
  1. M. L. Nash, BS1,
  2. L. L. Hungerford, DVM, MPH, PhD1,
  3. T. G. Nash, MS2 and
  4. G. M. Zinn, DVM, PhD3
  1. 1 Department of Veterinary Pathobiology, College of Veterinary Medicine, University of Illinois, Urbana, Illinois 61801,USA
  2. 2 Department of Animal Sciences, College of Agriculture, University of Illinois, Urbana, Illinois 61801, USA
  3. 3 Dixon Springs Agriculture Center, College of Veterinary Medicine, University of Illinois, Simpson, Illinois 61825, USA

Abstract

Factors associated with preweaning mortality in lambs were identified by developing risk profiles with logistic regressions for perinatal and postnatal mortality. Compared with heavy lambs, lambs of low birth weight had almost twice the risk of perinatal mortality (odds ratio [OR]=1.9) and lambs of average weight had a slightly lower risk (OR=0.7). Two of four lambing location categories affected perinatal mortality, with lambs born at unmonitored areas at greatest risk (OR=2.7). Multiple births increased the risk of perinatal mortality (OR=1.5), especially among Targhee lambs (OR=4.0). Breed variations in perinatal mortality were significant in Suffolk lambs (OR=1.9) and Booroola Rambouillet lambs (OR=2.1). Lambs born weak had an increased risk of postnatal mortality while strong lambs had a decreased risk (OR=3.7 and 0.6, respectively) if the dam had an adequate milk supply. Poor milk supply increased the risk of postnatal mortality for lambs of average vigour (OR=3.3), but did not change the risk for weak or strong lambs. Male lambs castrated at 30 days of age were at less risk of postnatal mortality (OR=0.3) than females. There were slight increases in the risk of postnatal mortality for intact males (OR=1.3), low birth weight lambs (OR=1.6), and lambs born in sheds (OR=1.3). Suffolk lambs (OR=1.8) and Targhee lambs (OR=1.6) had a higher risk of postweaning mortality.

    Statistics from Altmetric.com

      Request permissions

      If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.