| Protein supplementation of ruminants consuming low-quality cool- or warm-season forage: differences in intake and digestibility. | |
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MedLine Citation:
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PMID: 21622884 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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An in situ study (Exp. 1) using 4 ruminally cannulated steers (343 ± 11 kg BW) in a completely randomized design was used to compare ruminal degradation characteristics of low-quality cool-season (C3; Kentucky bluegrass straw; Poa pratensis; 6.3% CP; DM basis) and warm-season (C4; tallgrass prairie; 5.7% CP; DM basis) forage. Four ruminally cannulated steers (252 ± 8 kg BW; Exp. 2) and 4 wethers (38 ± 1 kg BW; Exp. 3) were used in two, 2 × 2 factorial design experiments to determine the influence of supplemental CP (CPSupp; soybean meal; 0.09 and 0.19% BW, CP basis, for steers and lambs respectively) on nutrient intake and digestion of C3 and C4 forages. Steers and wethers were allotted to separate 4 × 4 Latin squares that ran simultaneously with 20-d periods. In Exp. 1, C3 had greater A fractions (fraction of total pool disappearing at a rate too rapid to measure) and effective degradability of DM and NDF compared with C4 (P < 0.01). Also, C3 had a greater (P < 0.01) A fraction and effective degradability of N while the C fraction (fraction of total pool unavailable in the rumen) was less (P < 0.01) compared with C4. Consequently, rumen degradable protein accounted for 84.7% of total CP in C3 as compared to 66% for C4 (P < 0.01). In Exp. 2, a CPSupp × forage interaction (P < 0.01) was noted for forage and total DMI, with CPSupp increasing intake of C4 by 47%, and C3 forage by only 7%. Dry matter digestibility responded similarly with a CPSupp × forage interaction (P = 0.05; CPSupp increased digestibility 21% with C4 and 9% with C3 forage). Also, CPSupp × forage interactions were noted for ruminal liquid retention time (P = 0.02; CPSupp decreased retention 3.6 h with C4 and only 0.6 h with C3 forage) and particulate passage rate (P = 0.02; CPSupp increased passage 46% with C4 and 10% with C3 forage). As in Exp. 2, a CPSupp × forage interaction (P = 0.01; CPSupp increased digestibility 18% with C4 and 7% with C3 forage) was observed with DM digestibility in Exp. 3. In contrast, only N balance (P < 0.01) and N digestibility (P < 0.01) were affected by CPSupp. These data suggest that intake and digestion of low-quality C3 and C4 forages by ruminants are not similar and, more importantly, the physiological response of ruminants to protein supplementation of low-quality forage is dependent on forage type. |
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Authors:
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D W Bohnert; T Delcurto; A A Clark; M L Merrill; S J Falck; D L Harmon |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-27 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 May |
Date Detail:
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Created Date: 2011-5-30 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8003002 Medline TA: J Anim Sci Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Eastern Oregon Agricultural Research Center, Oregon State University, Burns 97720. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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