Author(s) |
Sharma, Nishchal K
Choct, Mingan
Toghyani, Mehdi
Laurenson, Yan C S M
Girish, C K
Swick, Robert A
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Publication Date |
2018-04-01
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Abstract |
<p>A 3-factor, 3-level Box-Behnken design was used to investigate the interaction effect of dietary digestible lysine (dLys, 9.5, 10.5, 11.5 g/kg), apparent metabolizable energy (AMEn, 12.77, 13.19, 13.61 MJ/kg) and available P (avP, 3.0, 4.0, 5.0 g/kg) levels on performance and amino acid (AA) digestibility of Ross 308 male broilers (n = 1,050) from d 14 to 34. The design consisted of 15 treatments each replicated 5 times with 12 birds per replicate. On d 34, 3 birds were sampled from each pen to collect ileal digesta (pooled per pen) to analyze AA. Response surface was fitted by first-, second-, or third-degree polynomial regressions in JMP statistical software v. 12.0.1. Feed intake (FI), weight gain (WG) and feed conversion ratio (FCR) were affected by dLys (linear and quadratic, <i>P</i> < 0.01), AMEn (linear, <i>P</i> < 0.01) and AMEn × avP (<i>P</i>< 0.01). Increased dLys increased FI but increased AMEn decreased FI in the birds fed the low-avP diet. However, when the avP level in the diet was increased, FI decreased to 13 MJ/kg AMEn and remained constant thereafter. Increased dLys increased WG whereas an increase in AMEn decreased WG in the birds fed the low-avP diet but had no effect on WG in those fed the high-avP diet. Increased dLys decreased FCR whereas increased AMEn decreased FCR in the birds fed the low-avP diet but had no effect on FCR in those fed the high-avP diet. Increased dLys increased breast yield percentage (linear, <i>P</i> < 0.01 and quadratic, <i>P</i>< 0.05) whereas increased AMEn decreased breast yield percentage (linear, <i>P</i>< 0.01). Dietary levels of dLys or avP had positive, linear effects on apparent ileal digestibility (AID) of methionine (<i>P</i>< 0.01) and threonine (<i>P</i>< 0.01) but had no effect on other AA (<i>P</i>> 0.05). These results indicate that increasing dLys levels above current industry standard would improve broiler performance irrespective of AMEn or avP levels of the diet.</p>
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Citation |
Poultry Science, 97(4), p. 1189-1198
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ISSN |
1525-3171
0032-5791
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Link | |
Publisher |
Elsevier BV
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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Title |
Dietary energy, digestible lysine, and available phosphorus levels affect growth performance, carcass traits, and amino acid digestibility of broilers
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Type of document |
Journal Article
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Entity Type |
Publication
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Name | Size | format | Description | Link |
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openpublished/DietarySharmaChoctToghyaniLaurensonSwick2018JournalArticle.pdf | 3285.954 KB | application/pdf | Published Version | View document |