Please use this identifier to cite or link to this item:
|Title:||Responses to Nitrogen and Maize Supplements by Young Cattle Offered a Low-quality Pasture Hay||Contributor(s):||Lee, G J (author); Hennessy, D W (author); Nolan, John V (author) ; Leng, Ronald (author)||Publication Date:||1987||DOI:||10.1071/AR9870195||Handle Link:||https://hdl.handle.net/1959.11/23296||Abstract:||Twenty-seven Hereford steers (227±3 kg) were offered ad libitum low-quality grass pasture hay containing 4.3 g N/kg DM. These steers were offered one of three maize supplements (nil, 570 g/day crushed maize or 680 g/day whole maize) alone or with one of two nitrogen (N) supplements (1 12 g/day urea: 250 g/day molasses, or 800 g/day pelleted protein meals). The crushed maize, whole maize and protein meal supplements were calculated to be isoenergetic on a metabolisable energy basis, and the urea and protein meal supplements were isonitrogenous. Both urea and protein meal supplements increased the intakes of hay and total digestible organic matter (DOMI), but there was a significant interaction between maize and N supplements such that maize increased hay and DOM intakes when offered alone. Unsupplemented steers ate only 1.98 kg OM of hay/day, whereas N supplemented steers ate 3.96-4.40 kg OM/day, and those supplemented with crushed and whole maize alone ate 2.45 and 2.85 kg OM/day respectively. The intakes of hay by the urea and protein meal supplemented groups were not significantly different. Both N and maize supplements had positive effects on liveweight change (P < 0.01), with N having the largest effect. Steers supplemented with protein meal gained 210 g/day more than those offered urea (P < 0.05), although DOMI was only 110 g/day more, indicating an effect of protein on the efficiency of utilisation of absorbed nutrients. N supplements increased rumen ammonia concentrations from 10±3.0 mg NH3-N/l in unsupplemented steers to 169± 19.3 and 105± 19.0 mg NH3-N/l in steers offered urea and protein meal respectively; there was a significant interaction between the form of N supplement and form of maize supplement (P < 0.05). Total volatile fatty acid concentrations in the rumen (65± 1.9 mM) did not differ significantly between supplements. Glucose entry rate was positively related to liveweight change and was increased by both the N supplements and whole maize. Glucose entry rate, adjusted for DOMI, was higher in protein meal supplemented steers than those receiving urea or no N supplement (P < 0.01), and these steers had the highest growth rate. Urea pool size, and synthesis rate in the body, were greater in steers given the urea and protein meal supplements (P < 0.05), but there were no significant differences in these measurements between urea and protein meal supplements.||Publication Type:||Journal Article||Source of Publication:||Australian Journal of Agricultural Research, 38(1), p. 195-207||Publisher:||CSIRO Publishing||Place of Publication:||Australia||ISSN:||0004-9409||Field of Research (FOR):||070204 Animal Nutrition||Peer Reviewed:||Yes||HERDC Category Description:||C1 Refereed Article in a Scholarly Journal||Statistics to Oct 2018:||Visitors: 3
|Appears in Collections:||Journal Article|
Files in This Item:
checked on Nov 30, 2018
checked on Apr 18, 2019
WEB OF SCIENCETM
Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.