Adrien, L.

Chilibroste, P.

Mattiauda, D. A.

Meikle, A.

Soca, Pablo

Uriarte, G.

English

University of Kentucky

University of Kentucky UKnowledge International Grassland Congress Proceedings 21st International Grassland Congress / 8th International Rangeland Congress Sward Allowance at Early Lactation of Primiparous Dairy Cows: III-Metabolic Profiles A. Meikle Universidad de la República, Uruguay D. A. Mattiauda Universidad de la República, Uruguay G. Uriarte Ministerio Ganaderia y Agricultura, Uruguay L. Adrien Universidad de la República, Uruguay Pablo Soca Universidad de la República, Uruguay See next page for additional authors 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/21/3-2/31 The 21st International Grassland Congress / 8th 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. Presenter Information A. Meikle, D. A. Mattiauda, G. Uriarte, L. Adrien, Pablo Soca, and P. Chilibroste This event is available at UKnowledge: https://uknowledge.uky.edu/igc/21/3-2/31 瞯 ]514　 瞯 　 Multifunctional Grasslands in a Changing World 　 Volume Ⅰ 　Grasslands/Rangelands Resources and Ecology ——— Soil‐Plant‐Animal InterrelationshipsSward allowance at early lactation of primiparous dairy cows : III‐Metabolic profilesMeikle1 , A . ; Mattiauda2 , D .A . ; Uriarte , G 3 . ; A drien2 L , Soca2 , P . and Chilibroste2 , P1 L aboratorio de Técnicas Nucleares , Facultad de Veterinaria . E‐mail : anamei＠ adinet .com .uy 　 2 EEMAC , Facultad deA gronomí a , Ruta 3 km 363 , CP 60000 , Paysandú . 3 DiL aVe , M inisterio Ganaderia y A gricultura , Uruguay .Key words : early lactation , primparous dairy cows , metabolic profilesIntroduction Major adaptive changes occur during the transition period (３ weeks before and after calving) to cope with the highenergy demands of lactation . This transition from pregnant nonlactating state to the nonpregnant lactating state represents adramatic change for the cow , as nutrients requirements exceed dietary intake potential , and thus , a state of negative energybalance is established to provide additional substrate for milk production . First calving cows recover from the negative energybalance period with more difficulty than multiparous cows ( Meikle et al . ２００４) and this factor is usually more dramatic undergrazing conditions . Dry matter intake ( DMI) is a main factor affecting energy balance , and sward state largely affects DMIunder grazing ( Chilibroste et al . , ２００５) . The metabolic variations that occur during the peripartum period can be monitored bythe concentration of some metabolites in blood . In this study the effect of daily sward allowance on metabolic profiles and itsrelation with milk production and evolution of body condition score (BCS) was investigated in primiparous cows under grazingconditions .Materials and methods The experiment was carried out at the EEMAC Research Station , Agronomy Faculty , Uruguay ( ３０° S) .Primiparous dairy cows ( n ＝ ４４ , BW ＝ ５９５ ± ４１ kg , age at calving ＝ ２ .９６ ± ０ .１１ years and BC ＝ ３ .７ ± ０ .３ ) were blocked byBW , age and BC , and randomly assigned from calving up to ６０ days in milk to one of the following treatments ( n ＝ １１ each) :controls with a １００％ TMR diet ( ad libitum) and the grazing treatments , high ( HA , ３０ kg DM cow day‐１ ) , medium ( MA , １５kg DM cow day‐１ ) and low sward allowance ( LA , ５ kg DM cow day‐１ ) . The grazing treatments were supplemented with TMRto cover their maintenance requirements . All the cows were individually supplemented at １８ :００ h with a mixture of corn silage(１０ kg ) compound feed (４ .８ kg ) and grass hay (０ .４) on a fresh weight basis . Cows were milked at ５ :００ and １６ :００ h and wereallowed to graze between ８ :００ and １５ :００ h every day on a ７‐days rotation schedule on a pasture of mixed grasses and legumes .BCS was registered weekly ( scale １ ＝ emaciated , ５ ＝ fat) . Blood samples were taken every weekly from one month before to ２months af ter calving . Plasmatic levels of total protein , albumin , urea , non esterified acids ( NEFA) , β‐hydroxybutyrate (BHB)and cholesterol , determined every ２ weeks during the experimental period . BCS and metabolites were analysed as repeatedmeasurements in time using Proc MIXED of SAS v . ８ .Results and discussion In all groups NEFA levels increased around calving and were associated with loss in the BCS . NEFAlevels were higher in HA and MA reflecting more lipid mobilization which is in line with an important BCS loss observed inthese groups during the first two weeks after calving . The BHB increase was observed later than NEFA increase which could berelated to cetogenesis , but also with diet composition since in the Control group ( １００ ％ TMR) BHB concentrations were lowerthan the grazing groups . Cholesterol , total protein , and albumin concentrations decreased around calving probably due to thelower intake during this period ( Cavestany et al . ２００５) . Cholesterol levels were higher in HA and MA than in LA , and it isknown that cows in better energy balance (BCS) have more cholesterol levels . On the other hand , Control cows presented thelowest cholesterol levels and had the highest BCS : this could indicate that other factors such as nutrition have a direct effect oncholesterol concentrations . Urea concentrations were higher in control and HA groups , which were the groups with the bestnutritional offer . A similar trend occurred in plasma protein levels , but it was significant only in Control cows .Conclusions This study shows that different sward allowances determined different metabolic profiles which were associated notonly with BCS but also with nutrient intake .ReferencesCavestany C , Blanc E , Kulcsar M , Uriarte G , Chilibroste P , Meikle A , Febel H , Ferraris A , Krall E . Effect of parity andbody condition score on metabolic profiles of dairy cows under a pasture‐based production system . Journal o f VeterinaryMedicine Series A , ２００５ , ５２ : １‐７ .Chilibroste , P . , Gibb , M . J . , Tamminga , S . , ( ２００５ ) . Pasture characteristics and animal performance . In : Dijkstra , J . ,Forbes , J ,M . , France , J . , Quantitative A spects o f Ruminant Digestion and Metabolism , CAB International , ６８１‐７０６ .Meikle , A . , Kulcsar , M . , Chilliard , Y . , Febel , H . , Delavaud , C . , Cavestany , D . , Chilibroste , P . , ( ２００４ ) . Effects ofparity and body condition at parturition on endocrine and reproductive parameters of the cow . Reproduction . １２７ : ７２７‐７３７ .

Sward Allowance at Early Lactation of Primiparous Dairy Cows: III-Metabolic Profiles

https://uknowledge.uky.edu/cgi/viewcontent.cgi?article=2719&amp;context=igc

Sward Allowance at Early Lactation of Primiparous Dairy Cows: III-Metabolic Profiles

Abstract

Similar works

Full text

Available Versions

University of Kentucky