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Evaluation of fattening performances and carcass characteristics of purebred, first and second cross lambs between Moroccan Timahdite, D’man and improved meat rams

Published online by Cambridge University Press:  18 August 2016

M. El Fadili ,
C. Michaux ,
J. Detilleux  and
P.L. Leroy
M. El Fadili
Affiliation:
Department of Zootechnic, National Institute of Agricultural Research, Rabat, Morocco Department of Genetics, University of Liège, 4000, Liège, Belgium
C. Michaux
Affiliation:
Department of Genetics, University of Liège, 4000, Liège, Belgium
J. Detilleux
Affiliation:
Department of Genetics, University of Liège, 4000, Liège, Belgium
P.L. Leroy
Affiliation:
Department of Genetics, University of Liège, 4000, Liège, Belgium
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Abstract

Fattening performance and carcass characteristics were evaluated in 202 lambs sired by D’man (D), Timahdite (T) and terminal sires of the Ile-de-France (IF), Lacaune (L), and Mérinos Précoce (MP) breeds. Previous results had suggested that the three latter improved breeds had relatively similar growth and carcass performance in crossbreeding. They were, therefore, pooled in this study into one meat group breed (M) to facilitate comparisons between the five genotypes of interest: two purebreds (T, D), two single crosses (D ✕ T (DT), M ✕ T), and one three-breed cross (M ✕ DT). Results showed important improvements of performance in crossbred lambs especially those sired by meat breed rams. M ✕ T and M ✕ DT lambs grew fastest (238 and 256 g/day, respectively) and showed the best food conversion ratio. D purebred lambs realized the lowest fattening gains (196 g/day) while, T and D ✕ T lambs were intermediate (209 and 218 g/day, respectively). The D lambs deposited relatively more internal fat and relatively less subcutaneous backfat, and their carcasses had the lowest conformation score and smallest longissimus muscle area (11·23 cm2). The carcasses of M ✕ T and M ✕ DT crossbred lambs had larger longissimus muscle areas 13·97 and 13·88 cm2, respectively, thicker subcutaneous fat cover and better conformation scores than other genotypes. The effects of M as a terminal sire breed were favourable for the majority of fattening and carcass characteristics. The absence of differences between M ✕ T and M ✕ DT genotypes on post-weaning growth, food conversion ratio and on objective and subjective measurements of carcass conformation indicated that the infusion of 25% of D genes in M ✕ DT lambs did not affect post-weaning growth and carcass traits. The results on the use of M sires and DT dams, which have above average reproductive rates, in M ✕ DT crossbreeding indicate that a two-stage crossbreeding system could enhance the quantity and the quality of meat sheep production in Morocco.

Keywords

carcass compositioncrossbreedingD’mangrowthsheepTimahdite.
Type
Breeding and genetics
Information
Animal Science , Volume 72 , Issue 2 , April 2001 , pp. 251 - 257
Copyright
Copyright © British Society of Animal Science 2001

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References

Berger, Y. M., Bradford, G. E., Essaadi, A., Johnson, D. W., Bourfia, M. and Lahlou-Kassi, A. 1989. Performance of the D’man and Sardi sheep on accelerated lambing. III. Lamb mortality, growth and production per ewe. Small Ruminant Research 2: 307–321.Google Scholar
Bouix, J. 1994. Amélioration des caractères bouchères des agneaux. Cours Supérieur d’Amélioration Génétique des Animaux Domestiques (CSAGAD)-sessions ovins allaitant, Rodez, France, pp. 14.Google Scholar
Boujenane, I., Araba, A. and Bradford, G. 1990. Croissance post-sevrage et caractères de carcasses des animaux de race D’man et Sardi et leurs croisés avec les races à viande. 41ème réunion annuelle de la FEZ, commission de génétique, Toulouse, France, pp. 4. Google Scholar
Boujenane, I., Barada, D., Mihi, S. and Jamai, M. 1996. Performances d’engraissement et caractéristiques des carcasses d’agneaux issus du croisement des brebis de races Timahdite, Beni Guil et Sardi avec les béliers de races améliorées. Actes de l’Institut Agronomique et Vétérinaire Hassan II 16: 29–38.Google Scholar
Boujenane, I., Bradford, G. E., Berger, Y. M. and Chikhi, A. 1991. Genetic and environmental effects on growth to 1 year and viability of lambs from a crossbreeding study of D’man and Sardi breeds. Journal of Animal Science 69: 3989–3998.Google Scholar
Bourfia, M. and Touchberry, R. W. 1993. Diallel cross of three Moroccan breeds of sheep. I. lamb growth and carcass traits. Journal of Animal Science 71: 870–881.CrossRefGoogle ScholarPubMed
Colomer-Rocher, F. 1986. Méthodes normalisées pour l’étude des caractères quantitatifs et qualitatifs des carcasses ovines produites dans le bassin méditerranéen, en fonction des systèmes de production. Rapport Européen 11479 Fr, Agriculture, Programme de recherche Agrimed, les carcasses d’agneaux et de chevreaux méditerranéens, 9 et 16 Décembre, Saragosse (Espagne), pp. 7–30.Google Scholar
El Fadili, M. and Leroy, P. L. 2000. Comparison of three terminal sire breeds for meat crossbred lambs in Morocco. Annales de Médecine Vétérinaire 145: 85–92.Google Scholar
El Fadili, M., Michaux, C., Detilleux, J. and Leroy, P. L. 2000. Comparison of five crossbreeding types involving improved terminal sire breeds of sheep: Timahdite, D’man and meat breeds. Ewes reproduction, lambs survival and growth performances. Animal Science 71: 435–441.Google Scholar
Greeff, J. C. 1992. Evaluation of the Finnish Landrace ✕ Merino and Merino as dam lines in crosses with five sire lines: slaughter and carcass traits of ram lambs. South African Journal of Animal Science 22: 21–30.Google Scholar
Lahlou-Kassi, A., Berger, Y. M., Bradford, G. E., Boukhliq, R., Tibary, A., Derqaoui, L. and Boujenane, I. 1989. Performance of D’man and Sardi sheep on accelerated lambing. I. Fertility, litter size, postpartum anoestrus and puberty. Small Ruminant Research 2: 225–239.Google Scholar
Ricordeau, G., Thimonier, J., Poivey, J., Driancourt, J. P., Houchereaude, M. A., Reviers, M. T. and Tchamitcian, L. 1990. Recherche INRA sur la race Romanov en France. Livestock Production Science 24: 305–332.Google Scholar
Rouse, G. H., Topel, D. G., Vetter, R. L. Rust, R. E. and Wickersham, T. W. 1970. Carcass composition of lambs of different stages of development. Journal of Animal Science 31: 846.Google Scholar
Statistical Analysis Systems Institute. 1989. SAS/QC software: reference, version 6. SAS Institute Inc., Cary, NC.Google Scholar
Young, L. D., Fahmy, M. H. and Torres-Hernandez, G. 1996. Use of prolific breeds in North America In Prolific sheep (ed. Fahmy, M. H.), pp. 289–343. CAB International, Wallingford.Google Scholar