The effect of feeding frequency and dose rate of nitrate supplements on blood haemoglobin fractions in Bos indicus cattle fed Flinders grass (Iseilema spp.) hay

Benu, I., Callaghan, M.J., Tomkins, N., Hepworth, G., Fitzpatrick, L.A., and Parker, A.J. (2016) The effect of feeding frequency and dose rate of nitrate supplements on blood haemoglobin fractions in Bos indicus cattle fed Flinders grass (Iseilema spp.) hay. Animal Production Science, 53 (10). pp. 1605-1611.

[img] PDF (Published Version) - Published Version
Restricted to Repository staff only

View at Publisher Website: http://dx.doi.org/10.1071/AN14886
 
2
4


Abstract

Twelve Bos indicus steers (LW ± SD, 317.8 ± 28.5) kg were used in an experiment to examine two factors: ily nitrate dose (0, 30, 40 or 50 grams of nitrate/day) and feeding frequency (once or twice a day) on methaemoglobin concentration, daily peak methaemoglobin concentration, rate of incline for methaemoglobin concentration, carboxyhaemoglobin concentration, oxyhaemoglobin concentration, total haemoglobin concentration, haematocrit and dry matter intake of Flinders grass hay. Increasing the dose rate of nitrate increased the fraction of methaemoglobin in the blood of steers (P = 0.014). A highly significant effect was demonstrated for the interaction of dose rate x day (P < 0.001). For once a day intake of nitrate, the dose rates of 40 and 50 grams per day showed a greater increase in mean methaemoglobin values than for the 0 and 30 grams of nitrate per day. Increasing the dose rate of nitrate also increased the daily peak methaemoglobin fraction and the rate of incline to peak methaemoglobin values for both once and twice a day feeding of the nitrate supplements. However, increasing the dose of nitrate had no significant overall effect on total haemoglobin, deoxyhaemoglobin, carboxyhaemoglobin, haematocrit or dry matter intake. Twice a day feeding of nitrate decreased the formation of methaemoglobin in the blood of Bos indicus steers. This study demonstrates that caution should be exercised when feeding nitrates as a non-protein nitrogen source to cattle grazing low quality pastures in northern Australia.

Item ID: 40695
Item Type: Article (Research - C1)
ISSN: 1836-5787
Keywords: Brahman, carbon, cattle, methaemoglobin, methane, nitrite
Related URLs:
Additional Information:

A version of this publication was included as Chapter 4 of the following PhD thesis: Benu, Imanuel (2017) The safety and efficacy of nitrate N supplementation to Bos indicus cattle. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Funders: James Cook University (JCU), Ridley AgriProducts, Department of Agriculture, Meat and Livestock Australia
Projects and Grants: National Livestock Methane Program, Carbon Farming Futures Filling the Research Gap Program
Date Deposited: 28 Oct 2015 03:13
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0702 Animal Production > 070204 Animal Nutrition @ 20%
07 AGRICULTURAL AND VETERINARY SCIENCES > 0707 Veterinary Sciences > 070702 Veterinary Anatomy and Physiology @ 80%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8303 Livestock Raising > 830301 Beef Cattle @ 100%
Downloads: Total: 4
More Statistics

Actions (Repository Staff Only)

Item Control Page Item Control Page