Effects of genetic and environmental factors on pre-weaning and post-weaning growth in West African crossbred sheep

K. Benyi, D. Norris, N. Karbo, K. A. Kgomo

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Effects of genetic and environmental factors on pre-weaning and post-weaning growth were studied in West African crossbred sheep. Effects of lamb genotype (7/8 Sahelian-1/8 Djallonké, 3/4 Sahelian-1/4 Djallonké and 1/2 Sahelian-1/2 Djallonké; hereafter denoted 7/8Sa, 3/4Sa and 1/2Sa, respectively), parity, type of birth, sex of lamb and year-season of lambing on birth weight, weaning weight, 8-month weight and pre- and post-weaning growth rates were determined. At birth 7/8Sa and 3/4Sa lambs were heavier (p < 0.01) than 1/2Sa lambs. Lambs born to first-parity ewes were lighter (p < 0.01) at birth than lambs of older ewes. At weaning and 8 months of age, lambs born to fourth-parity ewes were heavier (p < 0.05) than those born to ewes of the other parities. Parity did not have any significant effects on pre-weaning growth rate. Lambs born in the rainy season of 2001 were significantly heavier at birth and at 8 months of age than those born in the dry season of 2001/02, but there was no difference between the two groups at weaning. Pre-weaning growth rate was significantly faster in lambs born in the dry season of 2001/02 but the reverse was true for post-weaning growth rate.

Original languageEnglish
Pages (from-to)547-554
Number of pages8
JournalTropical Animal Health and Production
Volume38
Issue number7-8
DOIs
Publication statusPublished - Oct 1 2006

All Science Journal Classification (ASJC) codes

  • Food Animals
  • Animal Science and Zoology

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