| Effect of whole-crop pea (Pisum sativum L.) silages differing in condensed tannin content as a substitute for grass silage and soybean meal on the performance, metabolism and carcass characteristics of lambs. | |
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MedLine Citation:
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PMID: 21571892 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Two experiments were conducted to investigate the effect of inclusion of whole-crop pea (WCP) silages, differing in condensed tannin content, as a substitute for grass silage (GS) and soybean meal on lamb metabolism, performance, plasma metabolites, digestibility and carcass characteristics. In both experiments lambs were offered either; solely GS, or a 50:50 mix on a DM basis of GS with either low tannin (LTPS) or high tannin (HTPS) pea silage ad libitum. Each forage mix was fed with either; 400 g/d low protein (LP) concentrate or 400 g/d LP with an additional 200 g/d pelletized soybean meal (HP), resulting in six dietary treatments. Experiment 1 examined the effects of the diets on metabolism, digestibility and N balance using 6 lambs, in 4 periods of 21 d in an incomplete crossover design. Experiment 2 used 48 lambs and examined the effects of the diets on ADG, plasma metabolites and carcass characteristics over 56 d. Both experiments were analyzed using a 3x2 factorial design. In Experiment 1, lambs offered the LTPS diets had a greater (P < 0.05) digestibility of DM and OM, than those offered the GS diets. Lambs offered the WCP silages had an increased (P < 0.05) N intake, N output and digestibility of GE compared to those offered GS. Mean N digestibility was greatest (P < 0.05) in lambs offered LTPS. Lambs offered HP diets had increased (P < 0.001) digestibility of DM, OM, GE and N; N- intake, output, retention and digestibility compared to those offered the LP diets. In Experiment 2, there was no effect (P > 0.05) of forage type on intake, slaughter BW or feed conversion efficiency (FCE). However, lambs offered the LTPS had a greater (P < 0.05) ADG than those offered the GS diets. Feeding diets containing HP increased (P < 0.001) total DMI, slaughter BW, ADG and FCE. Lambs offered the WCP had a greater (P < 0.05) plasma β-hydroxybutyrate and urea concentration compared to those offered the GS diets. Feeding lambs HP diets increased (P < 0.05) plasma urea and total protein. Forage mix had no effect (P > 0.05) on carcass composition except for fat depth which was greater (P < 0.05) in lambs offered WCP silage. Diets containing the HP increased (P < 0.05) carcass weight, hind leg circumference, chop dimensions and kidney weight. It was concluded that lambs offered LTPS performed better than those offered GS and that LTPS has a concentrate sparing effect. Additionally, the increased tannin concentration in HTPS did not increase performance over lambs offered either GS or LTPS. |
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Authors:
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K J Hart; L A Sinclair; R G Wilkinson; J A Huntington |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-5-13 |
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: 2011-5-16 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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Animal Science Research Centre, Harper Adams University College, Newport, Shropshire, TF10 8NB, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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