Estimation of herbage intake of Angus heifers from growth rate and milk production

TitleEstimation of herbage intake of Angus heifers from growth rate and milk production
Publication TypeJournal Article
Year of Publication2010
AuthorsMartínez, J.M., Morris S T., and Parkinson T.J.
JournalNew Zealand Journal of Agricultural Research
Volume53
Issue1
Pagination29 - 35
Date Published2010
ISBN Number00288233 (ISSN)
KeywordsFeed efficiency
Abstract

Herbage intake was measured using n-alkanes (at age 10and 13 months) and the pre- and postgrazing technique (at age 12 and 14 months) in 80Angus heifers selected for high (Hi-Gr) or low (Lo-Gr) growth rate or high (Hi-Milk) or low (Lo-Milk) milk production. Average liveweight and estimated herbage intake at 10 months were 240.2±0.4 kg and 3.47±0.1 kg dry matter (DM)/head per day respectively. The respective values at 13 months of age were 287.2±1.9 kg and 6.50±0.36 kg DM/head per day. No differences in estimated herbage intake among the genetic lines were detected using n-alkanes at 10or 13 months of age. Average liveweight at 12 months of age was 247.1±0.7 kg and mean estimated intakes were 4.86±0.26, 4.17±0.26, 4.37±0.26 and 3.00±0.26 kg DM/head per day for the Hi-Gr, Lo-Gr, Hi-Milk and Lo-Milk lines, respectively. The Lo-Milk line had lower (P<0.05) estimated intake than the other three lines. At 14 months of age, average liveweight was 272.5±0.6 kg and estimated intakes were 6.99±0.18, 6.52 kg±0.18, 6.71±0.18 and 7.28±0.19 kg DM/head per day for the Hi-Gr, Lo-Gr, Hi-Milk or Lo-Milk lines, respectively. Lo-Milk heifers had higher (P<0.05) intakes than heifers from the Lo-Gr and Hi-Milk lines. No statistical difference in intake between the Lo-Milk and the Hi-Gr lines was detected. In general, the Hi-Gr heifers outperformed the heifers from other lines. © 2010 The Royal Society of New Zealand.

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