Use of Linear and Non-linear Growth Curves to Describe Body Weight Changes of Young Angus Bulls and Heifers

dc.contributor.author Hassen, Abebe
dc.contributor.author Tait, Richard
dc.contributor.author Wilson, Doyle
dc.contributor.author Rouse, Gene
dc.contributor.author Tait, Richard
dc.date 2018-08-25T20:09:55.000
dc.date.accessioned 2020-06-29T23:28:30Z
dc.date.available 2020-06-29T23:28:30Z
dc.date.copyright Thu Jan 01 00:00:00 UTC 2004
dc.date.issued 2004-01-01
dc.description.abstract <p>The objectives of the current study were to describe bodyweight (BW) changes of purebred Angus bulls and heifer and to evaluate bias in the adjustment of weaning weight measures to a 205-d age.Linear and non-linear growth functions were used to evaluate changes in BW.Models used were a simple linear regression model fitting cubic polynomial of age at measurement (model I) and a Logistic model (model II) .Predicted mature weight for bulls was 763 kg (1,678.6 lbs.) as compared to 541.9 kg (1192.2 lbs.) for heifers.Bulls attained a maximum average daily weight gain (ADG) of 1.75 kg/d (3.85 lbs/d) at a mean age of 296 d.The maximum ADG attained by heifers was 1.24 lb/d (2.73 lb/d) at a mean age of 261 d.Beef Improvement Federation procedures underestimated 205 d BW of bull calves measured at relatively younger ages and overestimated those measured at later ages. However, the extent of this bias seems to vary depending on the rate of growth of individual calves.The current results suggest that producers should consider creating contemporary groups with a smaller spread in age.</p>
dc.identifier archive/lib.dr.iastate.edu/ans_air/vol650/iss1/28/
dc.identifier.articleid 1028
dc.identifier.contextkey 3310916
dc.identifier.doi https://doi.org/10.31274/ans_air-180814-438
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath ans_air/vol650/iss1/28
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/8119
dc.language.iso en
dc.relation.ispartofseries Animal Science Research Reports
dc.source.bitstream archive/lib.dr.iastate.edu/ans_air/vol650/iss1/28/AS1869.pdf|||Fri Jan 14 23:08:23 UTC 2022
dc.subject.disciplines Agriculture
dc.subject.disciplines Beef Science
dc.subject.keywords ASL R1869
dc.title Use of Linear and Non-linear Growth Curves to Describe Body Weight Changes of Young Angus Bulls and Heifers
dc.type article
dc.type.genre beef
dspace.entity.type Publication
relation.isAuthorOfPublication 87b905df-0ec5-436c-b54a-54a44503da6c
relation.isJournalIssueOfPublication 3f2790ae-9c11-4703-87e0-39b318362bbc
relation.isSeriesOfPublication 7f3839b7-b833-4418-a6fa-adda2b23950a
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