| The effect of early-lactation feeding strategy on the lactation performance of spring-calving dairy cows. | |
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MedLine Citation:
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PMID: 17517748 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The objective of this study was to establish the influence of daily herbage allowance (DHA) and supplementation level offered to spring-calving dairy cows in early lactation on animal performance throughout lactation. Sixty-six Holstein-Friesian dairy cows were randomly assigned to a 6-treatment grazing study. The treatments comprised 3 DHA levels (13, 16, and 19 kg of DM/cow; >4 cm) and 2 concentrate supplementation levels (0 and 4 kg of DM/cow per day). Treatments were imposed from February 21 to May 8 (period 1; P1). During the subsequent 4-wk (period 2; P2), animals were offered a DHA of 20 kg of DM/cow and no concentrate. Subsequently, all animals grazed as a single herd to the end of lactation. Sward quality was homogeneous throughout lactation. A low DHA increased sward utilization (+14%) but reduced milk, solids-corrected milk, protein, and lactose yields compared with a high DHA during P1. Concentrate supplementation significantly increased milk, solids-corrected milk, fat, protein, and lactose yields during P1. The positive effect of concentrate supplementation remained throughout P2. A total concentrate input of 380 kg of DM/cow increased total lactation milk (+432 kg), solids-corrected milk (+416 kg), fat (+18 kg), protein (+15 kg), and lactose (+23 kg) yields. Greater P1 body weights were recorded when a high DHA and concentrate were offered. The P1 treatment had no effect on body condition score throughout lactation. The results indicate that offering a low DHA in early spring does not adversely affect total milk production, body weight, or body condition score, and offering concentrate results in a greater total lactation milk production performance. |
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Authors:
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E Kennedy; M O'Donovan; F P O'Mara; J P Murphy; L Delaby |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of dairy science Volume: 90 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2007 Jun |
Date Detail:
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Created Date: 2007-05-22 Completed Date: 2007-08-09 Revised Date: 2008-11-21 |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
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Languages: eng Pagination: 3060-70 Citation Subset: IM |
Affiliation:
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Dairy Production Research Centre, Teagasc, Moorepark, Fermoy, Co. Cork, Ireland. Emer.Kennedy@teagasc.ie |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Animal Feed* Animal Nutritional Physiological Phenomena / physiology* Animals Body Composition Body Constitution Cattle / physiology* Dietary Supplements Dose-Response Relationship, Drug Female Lactation / metabolism, physiology* Milk / chemistry*, secretion Nutritional Requirements Random Allocation Time Factors Weight Gain |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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