Escape protein supplementation of growing steers grazing stargrass |
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| Institution: | 2. Panhandle Research and Extension Center, University of Nebraska, Scottsbluff 69361;2. Professor, Animal and Range Sciences Department, New Mexico State University, Las Curses, NM 88003, USA;3. Regional Specialist in Range Management, Colorado State University Extension, Grand Junction, CO 81506, USA;4. Professor, School of Natural Resources and the Environment, University of Arizona, Tucson, AZ 85721, USA;1. Department of Animal Science, University of Nebraska–Lincoln, Lincoln 68583;2. Panhandle Research and Extension Center, University of Nebraska, Scottsbluff 69361;2. Division of Agriculture, Cooperative Extension Service. University of Arkansas, Little Rock 72204;3. Division of Agriculture, Livestock and Forestry Research Center, University of Arkansas, Batesville 772701;4. Furst-McNess Co, Freeport, IL 61032;2. Hill Farm Research Station, Louisiana State University AgCenter, Homer 71040;3. School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803 |
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| Abstract: | A grazing trial utilizing 35 individually supplemented growing steers (211±42 kg initial body weight (BW)) was conducted to study the effect of supplemental escape protein on the performance of steers grazing on stargrass (Cynodon plectostachyus) during the dry season. N in supplements was 100%, 50%, or 0% natural protein (bloodmeal, coconut meal, and soybean meal), and 0%, 50% or 100% urea. All steers received 2 kg of supplement dry matter (DM) (2.2% N) daily during the 90 days of the experiment. Steers fed the urea supplement had the lowest ADG (0.97 kg day−1). There was a linear (P<0.05) response in ADG to the natural protein level (50 and 100%) in supplements containing bloodmeal (1.11 and 1.21 kg day−1) and coconut meal (1.05 and 1.21 kg day−1), but no response was observed with soybean meal (1.01 and 1.0 kg day−1). Forage intake was not affected by supplementation. As a result of the growth response observed for supplements containing bloodmeal and coconut meal above the urea-based and soybean meal supplements, it was concluded that growing ruminants grazing stargrass in the dry season were deficient in escape protein. ©1997 Elsevier Science B.V. |
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