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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