Estudo de altos níveis de cobre orgânico e inorgânico como promotores de crescimento de leitões

Abstract

An experiment was conducted to evaluate high dietary leveis of organic and inorganic Cu, respectively, cupric citrate and copper sulfate, as growth promoters of weanling pigs fed complex diet. Eighty crossbred weanling pigs (40 castrated males and 40 females), averaging 6,85 kg initial weight and 21± 2 days of age, were assigned to 5 treatments in a randomized complete block design based on genetic group, sex and live weight. The treatments consisted in a basal diet of corn soybean meal, lactose, dried skim milk and spray dried porcine plasma meal ( control), or the basal diet containing 200 ppm of inorganic Cu (as Cu SO 4 .5H 2 O), or 50, 100 and 150 ppm of organic Cu (as C 6 H 4 Cu 2 O 7 ). The basal diet was supplemented with 2500 ppm of Zn (as ZnO) during the first 14 days of experimental period. Pigs were housed in 20 pens with 4 pigs (2 castrated males and 2 females) per pen (experimental unit)and 4 replications per treatment. Feed and water were given ad libitum to pigs during ali 28-day experimental period. Pigs were weighed individually and the d p. ta of feed intake/pen were X registered every week. Average daily garn, daily feed intake and feed conversion were not affected (P > 0,05) by high dietary leveis of copper. Therefore, high dietary leveis of organic, as cupric citrate, and inorganic, as copper sulfate, did not show any growth promoter effect on weanling pigs fed complex diet.