Zeaxanthin in a stabilized gelatin beadlet formulation was evaluated as a broiler pigmenter in 2 trials. In the first experiment, low oxycarotenoid basal broiler starter and grower rations were fed continuously for 7 weeks with zeaxanthin added to both of the rations at concentrations of 11, 22 and 33 mg./kg. Zeaxanthin was compared to three other pigmentation sources: (3-apo-8'-carotenoic acid ethyl ester, marigold petal meal and a concentrated extract from marigold petal meal.In the second experiment, zeaxanthin was added at a concentration of 2.75 to 11 mg./kg. to broiler grower rations containing <1.0, 5.5, 11, 16.5, or 22 mg. oxycarotenoids/kg. from feed ingredients and fed from the 29th through the 49th day.The birds from both experiments were processed under simulated commercial conditions. Shank color was visually scored by 3 or 4 persons using the Roche Yolk Color Fan and breast feather tract pigmentation was measured using the Purina Skin Pigmentation Guide.Zeaxanthin was shown to be a very effective broiler pigmenter producing a highly acceptable yellow to yellow-orange color in both the shanks and breast skin.
Lasalocid, a highly effective anticoccidial, was fed with several broiler growth promotants in three 8-week battery trials. A corn-soy ration was used in the first two trials and a rye-soy ration in the third. Birds were weighed at 1, 28, and 56 days, with feed intake recorded continuously and pigmentation measured at eight weeks.In the first trial, 0.0075% lasalocid was fed alone and in combination with 0.0025 or 0.005% roxarsone, 0.0055% zinc bacitracin or 0.00044% lincomycin. Improved growth and feed conversion were seen with all combinations and increased pigmentation with roxarsone. In the second study, 0.0125% lasalocid and 0.005% roxarsone were fed alone and combined. Roxarsone alone and in combination with lasalocid increased pigmentation. In the third trial, with the rye-soy ration, lasalocid was fed at 0.0075 or 0.0125% alone and in combination with 0.005% roxarsone and/or 0.0055% zinc bacitracin. Increased weight gain, improved feed conversion, or increased pigmentation were seen with the various combinations and the magnitude of response, especially growth, was far greater than that obtained with the corn-soy ration.Combinations of lasalocid and the broiler growth promotants, at the concentrations tested, were compatible and safe.
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