Desempenho, características de carcaça e qualidade da carne de suínos alimentados com glicerina bruta e ractopamina

Abstract

An experiment was carried out to evaluate the effects of increasing levels of crude glycerin, associated or not to ractopamine, on feed finishing pigs on performance, carcass and meat quality, and economic viability. For this purpose 64 male castrated pigs (initial weight 77.2 ± 6.0 kg) were used. The design was DBC, in a 4 x 2 factorial scheme, with four inclusion levels of crude glycerin (0, 100,150 and 200 g / kg) and two inclusion levels of ractopamine (0 and 10 mg / kg), totaling eight treatments evaluated in eight replicates of one animal each. The criterion used for the formation of the blocks was the initial weight of the animals and the experimental period lasted 28 days. Performance parameters, carcass characteristics and pork quality were evaluated. There was no interaction between the levels of crude glycerin and the addition of ractopamine in the diet for all evaluated parameters. The addition of ractopamine to the ration increased hot and cold carcass weight, warm carcass yield, shear force, flesh luminosity, hue angle and C16: 1 concentration in the lipid profile of the loin, besides improving feed conversion in 4.6% and decrease the concentration of C18: 0 and the activity of Alongase C16-C18 in the loin. Both daily consumption and total feed intake were influenced by the level of inclusion of glycerin in the diet. Gross i ncome was influenced by the level of inclusion of crude glycerin in the ration, however, net revenue was not reduced by the addition of ractopamine in rations containing up to 200g of crude glycerine / kg. It is concluded that, for finishing pigs, the inclusion of crude glycerin in the feed at a level of up to 200 g / kg can be used, associated with ractopamine (10 mg / kg), and may be an advantageous nutritional strategy by reducing feed conversion and result in improvements in carcass weight and in loin quality parameters, in addition to not reducing net revenue.