Effects of Increasing Dietary Niacin on Weanling Pig Performance |
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| Institution: | 2. Lonza, Inc., Fair Lawn, NJ 07410;1. Laboratório de Patologia Veterinária (LPV), Hospital Veterinário, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília (UnB), Campus Universitário Darcy Ribeiro, Ala Sul, Brasília, DF 70910-970, Brazil;2. Laboratório de Patologia Clínica Veterinária (LPCV), Hospital Veterinário, Faculdade de Agronomia e Medicina Veterinária, Universidade de Brasília (UnB), Campus Universitário Darcy Ribeiro, Ala Sul, Brasília, DF, 70910-970, Brazil;3. Laboratório de Imunoparasitologia, Departamento de Patologia Veterinária, Faculdade de Ciências Agrárias e Veterinárias, Universidade Estadual Júlio de Mesquita Filho (UNESP), Jaboticabal, Rod. Paulo Castelanne s/n, 4884-900, SP, Brazil;1. Gastrointestinal Laboratory, Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, USA;2. Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN, USA;3. Veterinary Large Animal Clinical Sciences, Texas A&M University, College Station, TX, USA |
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| Abstract: | Two experiments using 415 weanling pigs (4.8 ± 0.98 kg and 14 ± 4 d of age) were conducted to determine the effect of increasing dietary niacin on pig performance. Pigs were blocked by BW and randomly allotted to one of five dietary treatments. There were five pigs per pen with seven pens per treatment in Exp. 1, and eight pigs per pen with six pens per treatment in Exp. 2. Diets were fed in four phases (d 0 to 4, 4 to 8, 8 to 22, and 22 to 35). Pigs were fed the control diet with no added niacin or the control diet with 28, 55, 83, or 110 mg/kg of added niacin; data from both trials were combined. From d 0 to 22, increasing niacin had no effect (P>0.10) on growth performance. From d 22 to 35, increasing niacin had no effect (P>0.10) on ADG or ADFI, but improved (linear, P<0.04) gain:feed ratio (G:F). Overall (d 0 to 35), increasing niacin had no affect (P>0.10) on ADG or ADFI, but tended to numerically (linear, P<0.10) improve G:F. In summary, diets high in dried whey and other specialty protein sources appear to contain adequate niacin to maximize growth performance for the first 3 wk after weaning. However, in the late nursery phase (d 22 to 35) when pigs are fed corn-soybean meal diets, up to 110 mg/kg of added niacin linearly (P<0.04) improves G:F. |
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