Arias, S.

Arzadun, M.

Freddi, J.

Piazza, A.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings XXI International Grassland Congress / VIII International Rangeland Congress In Vivo Digestibility, Intake and Nitrogen Balance of Lambs Fed Different Barley Herbage: Sorghum Silage Diets M. Arzadun Universidad Nacional del Centro, Argentina S. Arias Universidad Nacional del Centro, Argentina J. Freddi Universidad Nacional del Centro, Argentina A. Piazza Universidad Nacional del Centro, Argentina Follow this and additional works at: https://uknowledge.uky.edu/igc  Part of the Plant Sciences Commons, and the Soil Science Commons This document is available at https://uknowledge.uky.edu/igc/21/15-1/25 The XXI International Grassland Congress / VIII International Rangeland Congress took place in Hohhot, China from June 29 through July 5, 2008. Proceedings edited by Organizing Committee of 2008 IGC/IRC Conference Published by Guangdong People's Publishing House This Event is brought to you for free and open access by the Plant and Soil Sciences at UKnowledge. It has been accepted for inclusion in International Grassland Congress Proceedings by an authorized administrator of UKnowledge. For more information, please contact UKnowledge@lsv.uky.edu. 瞯 672　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅱ 　Grasslands/Rangelands Production Systems ——— Forage Quality ,Conservation and UtilizationIn vivo digestibility , intake and nitrogen balance of lambs fed different barley herbage : sorghumsilage dietsM . A r zadun , S . A rias , J . Freddi and A . Piaz zaFacultad de Agronomí a . Universidad Nacional del Centro .A v . Republica de Italia 780 , A zul , A rgentina , E‐mail : mar zadun ＠ in f ovia .com .arKey words : barley herbage ,sorghum silage ,substitution ,intake ,nitrogen balanceIntroduction Animal production in the south of Buenos Aires Province ( Argentina) is frequently based on winter annual grasseswith high crude protein ( CP) content but an important fraction of dietary N may be lost before the small intestine ( Elizalde andSantini , １９９２ ) . To attain a more stable forage offer , the winter annual pasture is partially substituted by sorghum silage( Adelhadi and Santini , ２００５ ) and the proportion of both forages in the diet varies as a consequence of fluctuations in grassyield . The different herbage : silage proportion in the diet can affect animal perfomance and N retention in the animal could be auseful indicator of this fact . This work evaluated the nutritional effect of grass : silage replacement .Materials and methods Fresh barley forage ( Hordeum vulgaris cv . Alicia ) , and sorghum silage ( grain hybrid Ag １８０９ ) werecombined at ratios of １００ :０ , ７５ :２５ , ５０ :５０ , ２５ :７５ and ０ :１００ and offered ad libitum to wether lambs ( mean BW ＝ ５２ .５ ± ４ .０Kg) in a complete randomized design with ４ replications . Animals were allocated to metabolism stalls during a １２‐d adaptationperiod and an ８‐d collection period and fed at １２００ and ２０００h . Barley forage harvested each day was chopped to prevent animalselection . Feces , urine and refused forage were removed , weighed and sampled each day . N‐Kjeldhall was determined on solidsamples and urine . Data were analysed by ANOVA and orthogonal contrasts were conducted to test linear and quadraticeffects .Results Samples of barley and silage averaged along the experiment １９ .３ ( ± １ .６ ) and ３０ .７ ( ± ０ .７ ) ％ of dry matter , and １８ .２ ( ± ４ .５ ) and ５ .７ ( ± ０ .９ ) ％ of CP , respectively . Voluntary intake , DM digestion , N intake , N apparent digestion and Nexcreted in urine decreased along the barley by silage replacement ( Table １ ) . N retention , nevertheless , was maintained orslightly increased up to ５０ :５０ level and then tended to be null when diet was １００ ％ silage . The increase of N excretion in urineaccording to the increase in barley contribution to the diet was the main cause of this fact .Table 1 Voluntary intake , dry matter digestion and N balance in lambs according to barley pasture : sorghum silagecomposition on diet .Diet composition DM Intake DM Digestion N intake N digestion N urine N retentionBarley : Silage g / day g/ kg N g/ day１００ :０ ８６２ ７８５ １９ .９６ １７ .１１ １４ .２９ ２ .８２７５ :２５ ７６８ ７２２ １７ .５９ １３ .５０ ９ .４１ ４ .０９５０ :５０ ６５７ ７２３ １２ .７１ ９ .７３ ６ .０４ ３ .６８２５ :７５ ４８５ ６３７ ６ .９８ ４ .７９ ３ .５９ １ .２００ :１００ ４４３ ５２２ ４ .０９ ２ .２０ ２ .４６ ‐０ .２７Effect of diet 倡 倡倡 倡倡 倡倡 倡倡 倡Linear 倡倡 倡倡 倡倡 倡倡 倡倡 倡Quadratic 倡 倡 NS NS NS 倡倡倡 : P ≤ ０ .０１ ; 倡 : P ≤ ０ .１０ ; NS : P ＞ ０ .１０Conclusions These observations suggest a potential depresion of animal performance when sorghum silage represents more than５０ ％ of the diet but lower levels of substitution could have beneficial effects .ReferencesAbdelhadi , L .O . , Santini , F .J . , ２００６ . Corn silage vs grain sorghum silage as a supplement to growing steers grazing highquality pastures : effects on performance and ruminal fermentation . Animal Feed Science and Technology １２７ ,３３‐４３ .Elizalde , J .C . , Santini , F .J . , １９９２ . Factores nutricionales que limitan las ganancias de peso en bovinos durante el pastoreooto鼻o‐invierno . EEA INTA Balcarce Tech Bull １０４ , ２７ .

In Vivo Digestibility, Intake and Nitrogen Balance of Lambs Fed Different Barley Herbage: Sorghum Silage Diets

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In Vivo Digestibility, Intake and Nitrogen Balance of Lambs Fed Different Barley Herbage: Sorghum Silage Diets

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