Resumo

FLORES QUINTANA, C; YANEZ, E.A  e  CARLINO, M.N. Efectos del cruzamiento de ovejas Ideal con carneros Merino Multipropósito sobre la morfología de piel y producción de lana. Rev. vet. [online]. 2013, vol.24, n.1, pp.14-20. ISSN 1669-6840.

Crossbreeding effects of Multipurpose Merino rams with Ideal ewes on skin morphology and wool production. In Argentina, fine wool production is insignificant and this represents a limitation to wool industry of the country, as the global market tendency shows a preference for this type of raw material. Corrientes Province, in Argentina, has the same problem. An alternative to increase fine wool production without reducing meat production was the introduction of the Multipurpose Merino (MPM) which led to the need of understanding the impact on productive parameters and the structural basis that determines the improvement on wool quality. The objective was to evaluate the effect of crossing Ideal sheep with MPM rams, on the skin characteristics, wool production and quality. Studied parameters were fiber diameter, fiber length, weight, feece performance, follicle density and secondary/primary follicles ratio (S/P). Performance parameters were determined with INTA PROVINO protocol. Skin biopsies were performed for counting primary and secondary follicles of skin. Production and quality characteristics of wool were considered on same age ewes. Ideal sheep, Ideal ewe lamb and F1 Ideal x MPM showed fiber diameters of 24.30, 22.24 and 21.06 µm respectively, with significantly lower diameter at F1 crossbred. The other production parameters did not differ. The S/P ratio was greater in F1 ewes in relation to the Ideal, while the density of follicles showed no differences between contemporary animals. The comparison made in this work allowed us to observe a decrease in fber diameter in sheep F1 Ideal x MPM, which can be explained by the higher S/P ratio, without reduction of feece weight.

Palavras-chave : Sheep; Skin histology; Follicular density; Secondary/primary follicular ratio.

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