Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening

The objective of this study was to evaluate the effect of supplementing a CP-reduced diet with rumen-protected methionine on growth performance of Fleckvieh bulls. A total of 69 bulls (367 ± 25 kg BW) were assigned to three feeding groups (n = 23 per group). The control (CON) diet contained 13.7% CP...

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Autores principales:	V. Inhuber, W. Windisch, B. Bächler, M. Schuster, H. Spiekers, T. Ettle
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Amino acids Average daily gain Beef cattle Protein utilization Requirements Animal culture SF1-1100
Acceso en línea:	https://doaj.org/article/72be2bc806654ff1a29319c56aef6bf5
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spelling	oai:doaj.org-article:72be2bc806654ff1a29319c56aef6bf52021-11-26T04:25:04ZEffects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening1751-731110.1016/j.animal.2021.100366https://doaj.org/article/72be2bc806654ff1a29319c56aef6bf52021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1751731121002093https://doaj.org/toc/1751-7311The objective of this study was to evaluate the effect of supplementing a CP-reduced diet with rumen-protected methionine on growth performance of Fleckvieh bulls. A total of 69 bulls (367 ± 25 kg BW) were assigned to three feeding groups (n = 23 per group). The control (CON) diet contained 13.7% CP and 2.11 g methionine/kg diet (both DM basis) and was set as positive control. The diet reduced in CP (nitrogen) (RED) diet as negative control and the experimental RED + rumen-protected methionine (MET) diet were characterised by deficient CP concentrations (both 9.04% CP). The RED + MET diet differed from the RED diet in methionine concentration (2.54 g/kg DM vs. 1.56 g/kg DM, respectively) due to supplementation of rumen-protected methionine. Rumen-protected lysine was added to both RED and RED + MET at 2.7 g/kg DM to ensure a sufficient lysine supply relative to total and metabolisable protein intake. Metabolisable energy (ME) and nutrient composition were similar for CON, RED, and RED + MET. Bulls were fed for 105 days (d) on average. Individual feed intake was recorded daily; individual BW was recorded at the beginning of the experiment, once per month, and directly before slaughter. At slaughter, blood samples were collected and carcass traits were assessed. Reduction in dietary CP concentration reduced feed intake, and in combination with lower dietary CP concentration, daily intake of CP for RED and RED + MET was lower compared with CON (P < 0.01). Daily ME intake was reduced in RED and RED + MET compared with CON (P < 0.01). Consequently growth performance and carcass weights were reduced (both P < 0.01) in both RED and RED + MET compared with CON. Supplemental rumen-protected methionine was reflected in increased serum methionine concentration in RED + MET (P < 0.05) as compared to RED but it did not affect growth performance, carcass traits and serum amino acid (AA) concentrations, except for lysine which was reduced (P < 0.01) compared to CON and RED. In conclusion, bulls fed RED or RED + MET diets were exposed to a ruminal CP deficit and subsequently a deficit of prececal digestible protein, but methionine did not appear to be the first-limiting essential AA for growth under the respective experimental conditions.V. InhuberW. WindischB. BächlerM. SchusterH. SpiekersT. EttleElsevierarticleAmino acidsAverage daily gainBeef cattleProtein utilizationRequirementsAnimal cultureSF1-1100ENAnimal, Vol 15, Iss 11, Pp 100366- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Amino acids Average daily gain Beef cattle Protein utilization Requirements Animal culture SF1-1100
spellingShingle	Amino acids Average daily gain Beef cattle Protein utilization Requirements Animal culture SF1-1100 V. Inhuber W. Windisch B. Bächler M. Schuster H. Spiekers T. Ettle Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening
description	The objective of this study was to evaluate the effect of supplementing a CP-reduced diet with rumen-protected methionine on growth performance of Fleckvieh bulls. A total of 69 bulls (367 ± 25 kg BW) were assigned to three feeding groups (n = 23 per group). The control (CON) diet contained 13.7% CP and 2.11 g methionine/kg diet (both DM basis) and was set as positive control. The diet reduced in CP (nitrogen) (RED) diet as negative control and the experimental RED + rumen-protected methionine (MET) diet were characterised by deficient CP concentrations (both 9.04% CP). The RED + MET diet differed from the RED diet in methionine concentration (2.54 g/kg DM vs. 1.56 g/kg DM, respectively) due to supplementation of rumen-protected methionine. Rumen-protected lysine was added to both RED and RED + MET at 2.7 g/kg DM to ensure a sufficient lysine supply relative to total and metabolisable protein intake. Metabolisable energy (ME) and nutrient composition were similar for CON, RED, and RED + MET. Bulls were fed for 105 days (d) on average. Individual feed intake was recorded daily; individual BW was recorded at the beginning of the experiment, once per month, and directly before slaughter. At slaughter, blood samples were collected and carcass traits were assessed. Reduction in dietary CP concentration reduced feed intake, and in combination with lower dietary CP concentration, daily intake of CP for RED and RED + MET was lower compared with CON (P < 0.01). Daily ME intake was reduced in RED and RED + MET compared with CON (P < 0.01). Consequently growth performance and carcass weights were reduced (both P < 0.01) in both RED and RED + MET compared with CON. Supplemental rumen-protected methionine was reflected in increased serum methionine concentration in RED + MET (P < 0.05) as compared to RED but it did not affect growth performance, carcass traits and serum amino acid (AA) concentrations, except for lysine which was reduced (P < 0.01) compared to CON and RED. In conclusion, bulls fed RED or RED + MET diets were exposed to a ruminal CP deficit and subsequently a deficit of prececal digestible protein, but methionine did not appear to be the first-limiting essential AA for growth under the respective experimental conditions.
format	article
author	V. Inhuber W. Windisch B. Bächler M. Schuster H. Spiekers T. Ettle
author_facet	V. Inhuber W. Windisch B. Bächler M. Schuster H. Spiekers T. Ettle
author_sort	V. Inhuber
title	Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening
title_short	Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening
title_full	Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening
title_fullStr	Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening
title_full_unstemmed	Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening
title_sort	effects of supplementing a cp-reduced diet with rumen-protected methionine on fleckvieh bull fattening
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/72be2bc806654ff1a29319c56aef6bf5
work_keys_str_mv	AT vinhuber effectsofsupplementingacpreduceddietwithrumenprotectedmethionineonfleckviehbullfattening AT wwindisch effectsofsupplementingacpreduceddietwithrumenprotectedmethionineonfleckviehbullfattening AT bbachler effectsofsupplementingacpreduceddietwithrumenprotectedmethionineonfleckviehbullfattening AT mschuster effectsofsupplementingacpreduceddietwithrumenprotectedmethionineonfleckviehbullfattening AT hspiekers effectsofsupplementingacpreduceddietwithrumenprotectedmethionineonfleckviehbullfattening AT tettle effectsofsupplementingacpreduceddietwithrumenprotectedmethionineonfleckviehbullfattening
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Effects of supplementing a CP-reduced diet with rumen-protected methionine on Fleckvieh bull fattening

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