Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/23365
Full metadata record
DC FieldValueLanguage
dc.contributor.authorLee, G Jen
dc.contributor.authorHennessy, D Wen
dc.contributor.authorWilliamson, P Jen
dc.contributor.authorNolan, John Ven
dc.contributor.authorKempton, T Jen
dc.contributor.authorLeng, Ronalden
dc.date.accessioned2018-06-26T10:13:00Z
dc.date.issued1985en
dc.identifier.citationAustralian Journal of Agricultural Research, 36(5), p. 729-741en
dc.identifier.issn0004-9409en
dc.identifier.urihttps://hdl.handle.net/1959.11/23365en
dc.description.abstractA feeding experiment (47 days) was undertaken to evaluate the role of protein meal supplements for Hereford cows given a low quality subtropical grass hay and suckling calves (mean age 37 ± 2.2 days). The rates of supplementation were 0, 5.25, 10.5, 15.75, and 21.0 g pelleted protein meal /kg liveweight W⁰·⁷⁵. The consumption of grass hay, and the estimated total metabolizable energy intake (MEI) by cows, were significantly (P < 0.01) increased by supplements of protein meal, and their rate of liveweight loss was reduced (P < 0.01). Unsupplemented cows lost 2.56 kg/day compared with a 0.15 kg gain/day for cows given the highest rate of supplementation. Daily milk production and yields of milk protein, lactose, solids-not-fat and fat increased linearly (P < 0.01) with increasing amounts of protein meal. Throughout lactation, daily milk yield declined most rapidly (P < 0.01) in cows given the lower rates of protein supplementation: on day 33 the milk yield in the cows given 21 g protein meal/kg W⁰·⁷⁵ was 83% higher than that of the unsupplemented cows. In a second period the rate of supplementation of cows was altered on day 34 from 0 to 21.0 g/kg W⁰·⁷⁵. Milk yield at day 47 increased to the same output as that of cows supplemented at 21.0 g/kg W⁰·⁷⁵ from day 1. Growth rates of calves, over both periods, tended to be higher in those calves whose dams received the higher rates of supplementation, but the differences did not become significant (P < 0.05) until day 47. There were no significant differences (P < 0.05) in voluntary intakes of hay by the calves whose dams received the various rates of protein supplementation. The concentration of total volatile fatty acids (VFA) was higher (P = 0.06) in the rumen of supplemented cows, but the molar proportions of VFA did not differ between treatments, viz. acetate, 0.71; propionate, 0.16; butyrate, 0.09; other VFA, 0.04. Rumen ammonia concentration was higher (P < 0.01) in cows supplemented with protein meal at the higher rates. The kinetics of plasma glucose and its products in the cows were studied on day 28 by means of a single intravenous injection of [2-³H] and [U-¹⁴C] glucose, and on day 29 by means of an intravenous injection of [2-³H] glucose and [¹⁴C] sodium bicarbonate. The rates of irreversible loss of glucose C and of bicarbonate C were higher in all supplemented cows. The results are discussed in relation to the availability of substrates for glucose synthesis, glucose oxidation and utilization for synthesis of lactose in milk.en
dc.languageenen
dc.publisherCSIRO Publishingen
dc.relation.ispartofAustralian Journal of Agricultural Researchen
dc.titleResponses to Protein Meal Supplements by Lactating Beef Cattle Given a Low-Quality Pasture Hayen
dc.typeJournal Articleen
dc.identifier.doi10.1071/AR9850729en
dc.subject.keywordsAnimal Nutritionen
local.contributor.firstnameG Jen
local.contributor.firstnameD Wen
local.contributor.firstnameP Jen
local.contributor.firstnameJohn Ven
local.contributor.firstnameT Jen
local.contributor.firstnameRonalden
local.subject.for2008070204 Animal Nutritionen
local.subject.seo2008970107 Expanding Knowledge in the Agricultural and Veterinary Sciencesen
local.profile.schoolAdministrationen
local.profile.schoolUNE Student Support - Emeritus Professorsen
local.profile.emailjnolan@une.edu.auen
local.profile.emailrleng3@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-chute-20170729-174339en
local.publisher.placeAustraliaen
local.format.startpage729en
local.format.endpage741en
local.peerreviewedYesen
local.identifier.volume36en
local.identifier.issue5en
local.contributor.lastnameLeeen
local.contributor.lastnameHennessyen
local.contributor.lastnameWilliamsonen
local.contributor.lastnameNolanen
local.contributor.lastnameKemptonen
local.contributor.lastnameLengen
dc.identifier.staffune-id:jnolanen
dc.identifier.staffune-id:rleng3en
local.profile.orcid0000-0001-7949-950Xen
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:23547en
local.identifier.handlehttps://hdl.handle.net/1959.11/23365en
dc.identifier.academiclevelAcademicen
dc.identifier.academiclevelAcademicen
local.title.maintitleResponses to Protein Meal Supplements by Lactating Beef Cattle Given a Low-Quality Pasture Hayen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.description.statisticsepubsVisitors: 2<br />Views: 2<br />Downloads: 0en
local.search.authorLee, G Jen
local.search.authorHennessy, D Wen
local.search.authorWilliamson, P Jen
local.search.authorNolan, John Ven
local.search.authorKempton, T Jen
local.search.authorLeng, Ronalden
Appears in Collections:Journal Article
Files in This Item:
2 files
File Description SizeFormat 
Show simple item record

SCOPUSTM   
Citations

27
checked on Nov 30, 2018

Page view(s)

198
checked on May 3, 2019
Google Media

Google ScholarTM

Check

Altmetric


Items in Research UNE are protected by copyright, with all rights reserved, unless otherwise indicated.