Data/hora: 18/05/2024 07:39:53

Biblioteca(s): | Embrapa Caprinos e Ovinos.
Data corrente: | 06/04/2005
Data da última atualização: | 06/04/2005
Autoria: | EL FADILI, M.; MICHAUX, C.; DETILLEUX, J.; LEROY, P. L.
Título: | Evaluation of fattening performances and carcass charactaristics of purebred, first and second cross lambs between Moroccan Timahdite, D'man and improved meat rams.
Ano de publicação: | 2001
Fonte/Imprenta: | Animal Science, v. 72, pt 2 , p. 251-257, 2001.
Idioma: | Inglês
Conteúdo: | 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 cross- breeding. They were, therefore, pooled in this study into one meat group breed (M) to facilitate comparisons between lhe five genotypes of interest: two purebreds (T, D), two single crosses (D X T (DT), M X T), and one three-breed cross (M X DT). Results showed important improvements of performance in crossbred lambs especially those sired by meat breed rams. M X T and M X DT lambs grew fastest (238 and 256 g/day, respectively) and showed lhe best food conversion ratio. D purebred lambs realized lhe lowest fattening gains (196 g/day) while, T and D X T lambs were intermediate (209 and 218 g/day, respectively). The D lambs deposited relatively more infernal fat and relatively less subcutaneous backfat, and their carcasses had the lowest conformation score and smal lest longissimus muscle area (11.23 cm2). The carcasses of M X T and M X 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 X T and M X 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 X DT lambs dia not affect post-weaning growth and carcass traits. The results on the use of M sires and DT dams, which have above average reproductive rales, in M X DT crossbreeding indicate that a two-stage crossbreeding system could enhance the quantity and the quality of meat sheep production in Morocco.
Palavras-Chave: | Composição; Timahdite.
Thesagro: | Carcaça; Crescimento; Cruzamento; Genética Animal; Melhoramento; Ovino.
Categoria do assunto: | --
Registro original: | Embrapa Caprinos e Ovinos (CNPC)
Exemplares: | CNPC - (17618-1) - ADC - AP - -- -  -  - v.72,p.251 - DIS