Submitted to: ASA-CSSA-SSSA Annual Meeting Abstracts
Publication Type: Abstract only
Publication Acceptance Date: 8/15/2004
Publication Date: 10/1/2004
Citation: Kumar, K., Rosen, C.J., Baidoo, S., Chander, Y., Gupta, S.C., Russelle, M.P. 2004. Manure nutrient composition and cycling as influenced by swine feeding of antibiotics and protease inhibitors [abstract]. ASA-CSSA-SSSA Annual Meeting Abstracts. CD-ROM. Abstract No. 3588. Interpretive Summary:
Technical Abstract: Experiments were conducted to test the hypothesis that manure obtained from animals fed with antibiotics and protease inhibitors will differ in nutrient composition and nutrient cycling. Thirty-two pigs (18 day old) housed in 16 pens (2 per pen) were fed with four different diets for 1 month. The treatments were: (i) control (C), (ii) with antibiotics (Ab), (iii) with protease inhibitors (PI), and (iv) with antibiotics and protease inhibitors (Ab + PI). During the last week, pigs were transferred to metabolic crates and manure collected and analyzed for nutrient composition. Laboratory incubation studies were conducted to study nitrogen (N) mineralization in soil amended with above manures with and without additional antibiotics. In addition, a test crop of corn was planted in pots containing soil amended with these manures to supply N at two rates (100 and 200 kg N ha-1) with and without additional antibiotics. Manure composition in terms of NH4+-N, total N, total phosphorous, and various enzymes differed significantly between treatments. Although nitrification was inhibited, there was no effect of additional antibiotics on N mineralization. Antibiotics significantly reduced the corn dry matter and N uptake. The corn N uptake followed the trend: PI > Ab+PI = C > Ab. These results suggest that use of PI can increase N use efficiency in corn and mitigate the negative effects of antibiotics on N uptake.