| Effects of 6 times daily milking during early versus full lactation of Holstein cows on milk production and blood metabolites. | |
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MedLine Citation:
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PMID: 20723679 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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An experiment was conducted to determine the effects of different milking frequencies on entire lactation production performance in Holstein cows. One hundred twenty Holstein cows were assigned to 3 milking treatments (35 multiparous and 5 primiparous cows in each): 1) milking 6 times daily for the entire lactation (6x); 2) milking 6 times daily for the first 90 d in milk (DIM) and switching to 3 times daily milking afterward (6x-3x); and 3) milking 3 times daily for the entire lactation (3x). Milk yield was recorded every other day during the first 60 DIM and on 2 consecutive days per week subsequently. Cows were weighed and scored for their body condition immediately after parturition and monthly afterward. Blood and milk samples were taken from each cow on 30, 60, 90, 120, 150, 210, and 270 DIM, with an additional blood sampling on 15 DIM. Milk and fat corrected milk yield was greater for 6x and 6x-3x cows than for 3x cows (36.82, 37.32, and 36.1, 36.75 versus 34.56, 35.33 kg/d, respectively) during the experimental period. Milk fat and lactose percentage were not different among treatments, but milk protein was lower in 6x cows than in 6x-3x and 3x cows. Blood glucose concentration was higher and blood nonesterified fatty acids and beta-hydroxybutyrate concentration were lower in 3x cows than in 6x and 6x-3x cows during early lactation. Dry matter intake was greater in 6x cows than in 6x-3x and 3x cows (23.05, 22.58, and 22.45 kg/d, respectively). The 3x cows began to gain weight earlier than the 6x and 6x-3x cows, but there was no difference among groups for BW change regarding the entire experimental period. These results indicate that increasing milking frequency to 6 times daily increases milk yield only during early lactation and that there are no advantages of milking 6 times daily compared with 3 times daily during the mid and late lactation periods. Given the results of this study and the economical aspects of production, milking 6 times daily until 90 DIM and subsequently switching to milking 3 times daily is preferred. |
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Authors:
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M Eslamizad; M Dehghan-Banadaky; K Rezayazdi; M Moradi-Shahrbabak |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Journal of dairy science Volume: 93 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2010 Sep |
Date Detail:
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Created Date: 2010-08-20 Completed Date: 2010-11-30 Revised Date: - |
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: 4054-61 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Animal Science, Campus of Agriculture and Natural Resources, University of Tehran, Karaj, Iran. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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3-Hydroxybutyric Acid
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blood Animals Blood Glucose / analysis Cattle / blood, physiology* Dairying / methods* Eating / physiology Fatty Acids, Nonesterified / blood Female Lactation / physiology* Lactose / analysis Milk / chemistry, secretion* Milk Proteins / analysis |
| Chemical | |
Reg. No./Substance:
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0/Blood Glucose; 0/Fatty Acids, Nonesterified; 0/Milk Proteins; 300-85-6/3-Hydroxybutyric Acid; 63-42-3/Lactose |
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