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Analysis of an open nucleus breeding programme for Djallonkè sheep in the Ivory Coast. 1. Examination of non-genetic factors

Published online by Cambridge University Press:  02 September 2010

C. V. Yapi-Gnaorè ,
A. Oya ,
J. E. O. Rege  and
B. Dagnogo
C. V. Yapi-Gnaorè
Affiliation:
Institut Des Savanes (IDESSA), DRA. 01 BP 633 Bouakè 01, Ivory Const
A. Oya
Affiliation:
ANADER/PNSO, 01 BP 1166 Bouakè 01, Ivory Coast
J. E. O. Rege
Affiliation:
International Livestock Research Institute, Addis Ababa, Ethiopia
B. Dagnogo
Affiliation:
ANADER/PNSO, 01 BP 1166 Bouakè 01, Ivory Coast
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Abstract

Data on Djallonke sheep collected from 1983 through 1992 on 29 participating farms of an open nucleus improvement programme and from the nucleus were analysed. Initial on-farm records on 14342 lambs and on-station records on 2551 ram lambs were edited down to 6605 for birth weight (BWT), 5857 for preselection (birth to 80 days) average daily gain (PSADG), 10417 for 80-day weight (WT80), 13054 for lamb survival at pre-selection, 1978 for 180 (WT180) and 849 for 365 (WT365) day weights. Year of birth, sire line, flock, month and season of birth had significant (at leastP < 0·05) effects on both on-farm and on-station weights and on lamb survival. Trait means were 2·2 (s.e. 0·02) kg for BWT, 69·6 (s.e. 1·26) g/day for PSADG, 9·1 (s.e. 0·05) kg for WT80, 19·7 (s.e. 0·24) kg for WT180 and 31·8 (s.e. 0·45) kg for WT365. Mean survival was 90 (s.e. 0·9) %. Single lambs were heavier at birth and at 80 days of age, grew faster to 80 days and were about 200 and 500 g heavier at 180 and 365 days respectively than multiple lambs. There was a large variation between flocks: flock means for WT80 varied from 6·4 to 12·0 kg (CV 0·21), with smaller flocks having generally the lowest means. Lambs born in the hot-rainy season had the heaviest birth and 80-day weights, whereas ram lambs born in the cool rainy and early hot-dry seasons had the heaviest 180- and 365-day weights. Lambs born during the cool months of July to October had the lowest survival rate. Multiplicative factors were found to be more appropriate for adjusting on-farm records for type of birth, management level, birth date, season of birth and ewe parity than additive adjustment factors.

Keywords

breeding programmesIvory Coastsheep
Type
Research Article
Information
Animal Science , Volume 64 , Issue 2 , April 1997 , pp. 291 - 300
Copyright
Copyright © British Society of Animal Science 1997

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