Effects of anabolic steroids on nitrogen metabolism and growth of steers fed corn silage and corn-based diets supplemented with urea or combinations of soybean meal and feathermeal.
The objectives of these experiments were to examine whether N retention and feedlot performance by steers administered estradiol 17-beta (E2) alone (metabolism study) or in combination with trenbolone acetate (TAB; feedlot study) could be enhanced by increasing dietary ruminal escape protein. For the metabolism study, 16 Angus steers (average weight = 308 +/- 5 kg) were used in a randomized block design experiment having a 2 x 4 factorial arrangement of treatments. Main factors were E2 administration and supplemental CP source. Steers were fed diets based on corn silage and corn (60:30 DM basis) and were supplemented with urea or three combinations of soybean meal (SBM) and feathermeal (Fth). Combinations and SBM and Fth (SBM:Fth) provided 75:25, 50:50, and 25:75 of supplemental CP on a N basis. Estradiol 17-beta increased (P < .05) N retention and decreased (P < .05) plasma urea N concentrations. Total tract N digestion decreased linearly (P < .05) as the proportion of Fth in the diet increased. However, N retention increased linearly (P < .05) with increased Fth. A CP source x E2 interaction (P < .05) was observed for N retention because retention increased linearly with increasing dietary Fth in cattle receiving E2 but was unaffected (P > .05) in control steers. A growth study was conducted using 128 crossbred steers (400 +/- 19 kg) that received no implant or a combination of E2 (Synovex) and TBA (Finaplix-S). Steers were fed diets containing 75% high-moisture corn, 15% corn silage, and 10% supplement (DM basis) for 84 d (heavy replicate) or 124 d (light replicate).(ABSTRACT TRUNCATED AT 250 WORDS)
Cecava
M J
MJ
Department of Animal Sciences, Purdue University, West Lafayette, IN 47907.
Hancock
D L
DL
D045930:Anabolic Agents / Q000008:administration & dosage / Q000494:pharmacology*; D000821:Animal Feed; D000818:Animals; D001806:Blood Urea Nitrogen; D002417:Cattle / Q000254:growth & development / Q000378:metabolism*; D004044:Dietary Proteins / Q000008:administration & dosage*; D004343:Drug Implants; D004359:Drug Therapy, Combination; D004958:Estradiol / Q000008:administration & dosage / Q000494:pharmacology; D005241:Feathers; D005527:Food, Fortified; D007279:Injections, Subcutaneous / Q000662:veterinary; D008297:Male; D008460:Meat / Q000592:standards; D009584:Nitrogen / Q000378:metabolism*; D011897:Random Allocation; D013025:Glycine max; D014204:Trenbolone Acetate / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000494:pharmacology; D014508:Urea / Q000008:administration & dosage; D003313:Zea mays
D045930:Anabolic Agents; D004044:Dietary Proteins; D004343:Drug Implants; D004958:Estradiol; D014508:Urea; D009584:Nitrogen; D014204:Trenbolone Acetate