Lincomycin has relatively high potency on gram-positive bacteria and certain anaerobic bacteria. Its effect on respiratory tract diseases is significant. Spectinomycin principally has powerful antibacterial effect on gram-negative bacteria and can control bacterial infections in gut. When Lincomycin and Spectinomycin are combined, the antibacterial spectrum is wider and the antibacterial effects are synergically strengthened. Speclinfeed can be used for the prophylaxis of respirotary and digestive tract diseases. *Prophylaxis and treatment of diarrhea and necrotic enteritis caused by Escherichia coli, Salmonella and Hyodysenteriae spirochaetes. *Prophylaxis and treatment of respiratory tract diseases caused by Pasteurella multicida, Bordetella bronchiseptica, Actinobacillus pleuropneumonia, Haemophilus parasuis, Streptococcus suis and Mycoplasma hyopneumoniae. *Promotion of growth performance and feed efficiency.