Document Detail

Dietary structural to nonfiber carbohydrate concentration during the transition period in grazing dairy cows.
MedLine Citation:
PMID:  20655437     Owner:  NLM     Status:  MEDLINE    
A study was conducted to evaluate the potential effects of altering the proportion of dietary structural carbohydrate (SC) relative to nonfiber carbohydrate (NFC) pre- and postpartum on milk production and the circulating concentrations of hormones and metabolites. Dietary treatments were arranged as a 2 x 2 factorial, with 68 multiparous cows assigned to isoenergetic diets [114 MJ of metabolizable energy (ME)/cow per d] precalving; diets were either fresh pasture and pasture silage (PreP) or pasture and pasture silage supplemented with 3 kg dry matter (DM)/cow per d of a corn- and barley-based concentrate for 36 d prepartum (PreC). Final treatments were 13 or 32% DM NFC, respectively. After calving, cows within each prepartum diet were assigned to isoenergetic diets (179 MJ of ME/cow per d) differing in their SC and NFC content. Postcalving diets were either fresh pasture and pasture silage (PostP) or pasture and pasture silage supplemented with 5 kg DM/cow per d of a corn- and barley-based concentrate (PostC) until 35 d in milk. Final treatments were 18 and 38% DM NFC, respectively. Relative to day of calving (d 0), blood samples were collected at least weekly from d -28 to d 35. During the prepartum period, PreC cows had lower plasma urea, albumin, insulin-like growth factor-I, and Ca concentrations, but greater nonesterified fatty acid and Mg concentrations. There were no evident effects of prepartum diet on body weight or body condition score, milk yield, or milk composition. During the postpartum period, PostC cows had lower concentrations of plasma urea, beta-hydroxybutyrate, and Ca, but greater concentrations of nonesterified fatty acids, glucose, insulin-like growth factor-I, and Mg. Postpartum metabolic differences in PostC cows were associated with increased milk protein production and reduced milk fat (yield and %). Results do not support a periparturient metabolic benefit to altering the SC to NFC ratio precalving, but imply an altered rumen fermentation, gluconeogenesis, and milk composition when dietary SC to NFC ratio is altered postcalving.
J R Roche; J K Kay; C V C Phyn; S Meier; J M Lee; C R Burke
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Publication Detail:
Type:  Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of dairy science     Volume:  93     ISSN:  1525-3198     ISO Abbreviation:  J. Dairy Sci.     Publication Date:  2010 Aug 
Date Detail:
Created Date:  2010-07-26     Completed Date:  2010-11-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985126R     Medline TA:  J Dairy Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  3671-83     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2010 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.
DairyNZ Limited, Private Bag 3221, Hamilton, New Zealand.
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MeSH Terms
Animal Feed*
Calcium / blood
Cattle / blood,  physiology*
Dietary Carbohydrates / administration & dosage*
Fatty Acids, Nonesterified / blood
Insulin-Like Growth Factor I / analysis
Lactation / physiology*
Magnesium / blood
Milk / chemistry,  secretion*
Postpartum Period / physiology
Reg. No./Substance:
0/Dietary Carbohydrates; 0/Fatty Acids, Nonesterified; 67763-96-6/Insulin-Like Growth Factor I; 7439-95-4/Magnesium; 7440-70-2/Calcium

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