Resumen de Efecto de la alimentación con grasa saturada y poliinsaturada sobre la composiciòn láctea de ovejas de pelo en condiciones tròpicales

J.G. Vicente, María Isabel Yubero, Isaac de Gasperín López, Rubén Loeza Limón, J. J. M. Martínez, P. Cervantes, Eduardo Canudas Lara, F. Velázquez, Clemente J. López Bote

• A feeding experiment was conducted with 24 crossbred lactating ewes that were fed diets containing 2% lard, 2% soybean oil and a control group, with a total of 8 ewes by treatment. The study was conducted at the sheep station in “Torreon del Molino” Universidad Veracruzana., Veracruz. Mexico. Diets were offered 15 days before parturition and during 5 weeks of lactation The diets were isocaloric and formulated in a 70:30 forage concentrate ratio with Pangola grass hay (Digitaria decumbens) as the forage source. Milk was collected and started after parturition and each week until weaning. Fat, crude protein, casein, lactose, non-fat solids and total solids were determined. The milk of the Control group had higher milk fat than lard and soybean oil diets (P< 0.03), without an effect on protein, or lactose content. Time repeated measurement statistical analyses showed an increasing fat content along time only for diets containing fat and remained constant in control group The results obtained allow to observe that fat addition in diets for lactating ewes perhaps require longer periods of adaptation to the diets, to achieve changes in the lipid milk composition, in a shorter term without compromising the normal function of the rumen. Fat supplementation in ewes diets may result in benefits for lamb growth, therefore more related studies are necessary.