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Impact of adding nitrate or increasing the lipid content of two contrasting diets on blood methaemoglobin and performance of two breeds of finishing beef steers

Published online by Cambridge University Press:  02 December 2015

C-A. Duthie ,
J. A. Rooke ,
S. Troy ,
J. J. Hyslop ,
D. W. Ross ,
A. Waterhouse  and
R. Roehe
C-A. Duthie*
Affiliation:
Beef and Sheep Research Centre, Future Farming Systems Group, SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
J. A. Rooke
Affiliation:
Beef and Sheep Research Centre, Future Farming Systems Group, SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
S. Troy
Affiliation:
Beef and Sheep Research Centre, Future Farming Systems Group, SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
J. J. Hyslop
Affiliation:
Beef and Sheep Select, SAC Consulting Ltd., SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
D. W. Ross
Affiliation:
Beef and Sheep Research Centre, Future Farming Systems Group, SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
A. Waterhouse
Affiliation:
Beef and Sheep Research Centre, Future Farming Systems Group, SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
R. Roehe
Affiliation:
Animal Breeding and Development, Animal and Veterinary Sciences Group, SRUC, Kings Buildings, West Mains Road, Edinburgh, EH9 3JG, UK
*
†E-mail: [email protected]
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Abstract

Adding nitrate to the diet or increasing the concentration of dietary lipid are effective strategies for reducing enteric methane emissions. This study investigated their effect on health and performance of finishing beef cattle. The experiment was a two×two×three factorial design comprising two breeds (CHX, crossbred Charolais; LU, Luing); two basal diets consisting of (g/kg dry matter (DM), forage to concentrate ratios) 520 : 480 (Mixed) or 84 : 916 (Concentrate); and three treatments: (i) control with rapeseed meal as the main protein source replaced with either (ii) calcium nitrate (18 g nitrate/kg diet DM) or (iii) rapeseed cake (RSC, increasing acid hydrolysed ether extract from 25 to 48 g/kg diet DM). Steers (n=84) were allocated to each of the six basal diet×treatments in equal numbers of each breed with feed offered ad libitum. Blood methaemoglobin (MetHb) concentrations (marker for nitrate poisoning) were monitored throughout the study in steers receiving nitrate. After dietary adaptation over 28 days, individual animal intake, performance and feed efficiency were recorded for a test period of 56 days. Blood MetHb concentrations were low and similar up to 14 g nitrate/kg diet DM but increased when nitrate increased to 18 g nitrate/kg diet DM (P<0.001). An interaction between basal diet and day (P<0.001) indicated that MetHb% was consistently greater in Concentrate – than Mixed-fed steers at 18 g nitrate/kg diet DM. Maximum individual MetHb% was 15.4% (of total Hb), which is lower than considered clinically significant (30%). MetHb concentrations for individual steers remained consistent across time. Concentrate-fed steers were more efficient (lower residual feed intake (RFI) values) than Mixed-fed steers (P<0.01), with lower dry matter intake (DMI) (kg/day) (P<0.001) and similar average daily gain (ADG). CHX steers were more efficient (lower RFI; P<0.01) than LU steers with greater ADG (P<0.01), lower DMI (/kg BW; P<0.01) and lower fat depth (P<0.001). ADG, BW or DMI did not differ across dietary treatments (P>0.05). Neither basal diet nor treatment affected carcass quality (P>0.05), but CHX steers achieved a greater killing out proportion (P<0.001) than LU steers. Thus, adding nitrate to the diet or increasing the level of dietary lipid through the use of cold-pressed RSC, did not adversely affect health or performance of finishing beef steers when used within the diets studied.

Keywords

beef cattlelipidmethaemoglobinnitrateperformance
Type
Research Article
Information
animal , Volume 10 , Issue 5 , May 2016 , pp. 786 - 795
Copyright
© The Animal Consortium 2015 

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