Eight Holstein calves approximately 6 months of age (mean BW 185.15 + 16.16 kg) were used in a replicated 4 x 4 Latin Square experiment to study effects of protein sources on performance of weaned dairy calves. Dietary treatments consisted of 16% CP diets with three sources of ruminally undegradable protein (RUP). Experimental diets were corn-silage based, with soybean meal (SBM) as the source of ruminally degradable protein (control) and 3 sources of RUP including heat treated soybean meal (SBM) (SoyPLUS®), animal protein blend (PRO-LAK), and extruded-expelled SBM, included at 45% of the dietary CP. The animals were fed their respective diets twice daily ad libitum. Animals were housed in individual stalls for 14 days for dietary adjustment and feed intake measurements. Steers were housed in metabolism crates during the last 4 days of each experimental period for sample collection. Total fecal and urine output was collected, weighed, and sampled for laboratory analysis of nitrogen during the 4-d collection period. On day 4 of the collection period, animals were fitted with jugular catheters. Blood samples were collected at 15-minute intervals for 6 hours for analysis of growth hormone. An additional blood sample was collected at time 0 for plasma urea nitrogen (PUN) and at 30-minute intervals for IGF-I and insulin. On day 18 of each experimental period body weight, wither height, hip height, and body length were measured. Treatment did not affect dry matter intake (P > 0.05). There were also no effects (P > 0.05) of protein source on nitrogen metabolism, PUN, or growth parameters. There was no effect (P > 0.05) of protein source on GH levels. There was no effect of RUP sources on plasma IGF-I concentrations on (P > 0.05). Treatment did not affect (P > 0.05) insulin concentrations. However, there was an affect of time on insulin concentrations (P < 0.05). There was no difference (P >0.05) among treatments in the digestibility of DM, OM, NDF, ADF, or CP. These data suggest that feeding diets with sources of RUP does not improve performance in weaned dairy calves.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-07132007-112833 |
| Date | 13 July 2007 |
| Creators | Sissell, Christopher Aaron |
| Contributors | Vinicius Moreira, Cathleen C. Williams, Bruce Jenny, Charles Hutchison |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-07132007-112833/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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