title: Effect of the inclusion time of dietary saturated and unsaturated fats before slaughter on the accumulation and composition of abdominal fat in female broiler chickens.
abstract: The aim of this experiment was to assess the effects of four different feeding programs designed to include tallow, a saturated fat at 0, 8, 12, and 28 d prior to slaughter on female broiler performance and the deposition, fatty acid profile, and melting point of abdominal fat. The following treatment groups were established according to dietary inclusion--from 21 to 49 d of age--of: sunflower oil (SUN), sunflower oil followed by tallow during the last 8 d (SUN + 8TALL), sunflower oil followed by tallow during the last 12 d (SUN + 12TALL), and tallow (TALL). The diets were designed to be isoenergetic and isonitrogenous. Abdominal fat deposition increased linearly with increasing number of days in which birds were fed the tallow-enriched diet. However, linear and quadratic response patterns were found between days before slaughter in which the birds were fed the tallow-enriched diet and abdominal fat melting points. This result suggested an exponential response in which 85% of the maximum level was already attained when the dietary fat type changed from an unsaturated to a saturated condition during the last 8 d of the feeding period. The use of an unsaturated fat source during the first stages of growth, and the substitution of a saturated fat for a few days before slaughter, may offer the advantage of lower abdominal fat deposition and an acceptable fat fluidity compared with the use of a saturated fat source during the whole growing and finishing period.
authors.affiliation: Departamento de Produccion Animal, Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Sanz
authors.forename: C J
authors.initials: CJ
authors.lastname: Lopez-Bote
authors.forename: A
authors.initials: A
authors.lastname: Flores
authors.forename: J M
authors.initials: JM
authors.lastname: Carmona
mesh_terms: D000005:Abdomen; D000273:Adipose Tissue; D000818:Animals; D001823:Body Composition; D002645:Chickens / Q000502:physiology*; D004041:Dietary Fats / Q000008:administration & dosage*; D004042:Dietary Fats, Unsaturated / Q000008:administration & dosage*; D004435:Eating; D002149:Energy Intake; D005223:Fats; D005260:Female; D010938:Plant Oils; D000074242:Sunflower Oil; D013997:Time Factors; D015430:Weight Gain
chemical_list: D004041:Dietary Fats; D004042:Dietary Fats, Unsaturated; D005223:Fats; D010938:Plant Oils; D000074242:Sunflower Oil; C013698:tallow