Effects of fish meal in lamb diets on growth performance, carcass characteristics and subcutaneous fatty acid composition
2007
Atti, N., Institut National de la Recherche Agronomique, Ariana (Tunisia). Laboratoire de Productions Animales et Fourragères | Mahouachi, M., Ecole Supérieure d'Agriculture du Kef (Tunisia) | Rouissi, H., Ecole Supérieure d'Agriculture de Mateur (Tunisia)
The objective of this investigation is the study of the effects of fish meal (FM) in lamb diets on growth performance, carcass characteristics, and subcutaneous fatty acid (FA) composition. Twenty-five lambs were assigned to five dietary treatments (5 per treatment). Lambs were offered 200 g dry matter (DM) of oat hay and ad libitum amounts of concentrate. For control lambs, the concentrate was a mixture of barley, soybean meal (SBM) and mineral-vitamin supply. For the other groups, FM at 5 or 10 per cent. Moreover, two strategies were developed to feed diets containing FM: FM diets were offered for 55 days before slaughter or during the whole experiment (105 d). All the concentrates were isonitrogenous. Dry matter intake and average daily gain were not affected by FM feeding. Carcass traits and organ weights were neither affected by FM feeding nor by feeding strategy except for the dressing percentage, which was higher for FM diets than for the control diet. FM feeding did not affect carcass adiposity or subcutaneous lipids' FA composition. Water holding capacity was not affected by FM feeding but pH decreased with FM diets. In these experimental conditions, FM could replace SBM as a protein source but did not affect carcass or FA composition.
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