| Effect of type of grinding of barley and dehydrated alfalfa on performance, digestion, and crude mucin ileal concentration in growing rabbits. | |
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MedLine Citation:
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PMID: 21478455 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The effect of type of grinding of barley and dehydrated alfalfa (DA) was tested in rabbits weaned at 35 d of age with average BM of 846 ± 93 g. Four non-medicated diets were arranged in a 2 x 2 factorial structure with type of grinding (coarse grinding with a 4.5-mm screen or fine grinding with a 1.5-mm screen) of barley (TGB) and DA (TGDA) as main factors. A total of 1,056 mixed-sex rabbits (264 per diet) were fattened until d 63. Most of these rabbits (216 per diet) were housed in pairs and only used to record mortality rate. Mortality was also recorded for the remaining 192 rabbits, which were housed individually and used to determine growth performance. From this group, 100 rabbits were used to determine digestive traits. Apart from those rabbits, a different group of 88 rabbits (44 were housed individually and the remaining 44 were housed in pairs) was used in the digestibility trial. All rabbits of this group were used to determine ileal digestibility (13 pools of ileal digesta per diet) and ileal mucin concentration (6 pools of ileal digesta per diet), whereas only the 44 individually housed rabbits were used to assess the fecal digestibility coefficients (11 rabbits per diet). Lastly, a jejunal sample was excised from 32 out of the 44 individually housed rabbits to determine mucosal histology. Treatments did not affect ADG, ADFI, or G:F in the entire fattening period but, in the 49 to 63 d period, the diet containing both finely ground barley and DA reduced ADFI (P = 0.08) compared with other treatments (130 vs. 137 g). Moreover, this diet also increased total digestive tract (4.76%, P = 0.08) and cecal content weight (11.3%, P = 0.08) compared to the other 3 treatments. Pylorus (P = 0.09) and mixed digesta (P = 0.06) pH, respectively, were reduced from 1.53 and 1.59 to 1.37 and 1.44 when both barley and DA were ground finely instead of coarsely. Grinding coarsely both barley and DA reduced ileal digestibility of starch (0.899 vs. 0.936, P = 0.06), increased (P < 0.01) its ileal flow and content in the feces up to 1.66 g/d and 7.42 g/kg DM, respectively, and led to lower fecal digestibility (0.932 vs. 0.951, P < 0.01) compared with fine grinding. Coarse DA shortened villi (612 vs. 704 μm, P = 0.02), increased crypt depth (121 vs. 92.1 μm, P = 0.01), and reduced villus/crypt ratio (5.08 vs. 7.66, P < 0.01) compared with finely ground DA. Furthermore, the greatest ileal crude mucin (148 vs. 107 g/kg DMI, P = 0.02) and sialic acid (71.7 vs. 61.7 mg/kg DMI, P = 0.04) concentrations were reported in rabbits receiving the diet with both coarsely ground barley and DA. Finally, mortality rate was not influenced by treatments, with an average of 9.64%. In conclusion, the diet containing finely ground barley and coarsely ground DA did not increase cecal content weight, resulting in a high feed intake, and led to a high ileal digestibility and a low ileal flow of starch. |
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Authors:
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C Romero; N Nicodemus; J D Rodríguez; A I García; C de Blas |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-4-8 |
Journal Detail:
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Title: Journal of animal science Volume: - ISSN: 1525-3163 ISO Abbreviation: - Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-4-11 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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Departamento de Producción Animal, Universidad Politécnica de Madrid, ETS Ingenieros Agrónomos, 28040, Madrid, Spain. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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