| Undegradable protein supplementation to early-lactation dairy cows in grazing conditions. | |
| | |
MedLine Citation:
|
PMID: 11467808 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
To determine the production responses to rumen undegradable protein (RUP) feeding in grazing conditions, we fed 18 multiparous Holstein cows concentrates containing either soybean meal (SBM) or blood meal (BM) during the first 8 wk of lactation. One cow from the SBM treatment was removed because of mastitis. Six additional dairy cows in late lactation fitted with ruminal cannula were used to evaluate the rumen environment and the in situ crude protein (CP) degradability of concentrates. On a dry matter (DM) basis, concentrates contained SBM (33%) or BM (13%), corn grain (64 and 84% for SBM and BM, respectively) and a mineral-vitamin complex (3%). Concentrates were offered at a rate of 6.6 kg/d per cow and herbage allowance averaged 31 kg/d of DM per cow. The BM reduced ruminal ammonia-N levels and had no effect on ruminal pH and molar volatile fatty acid concentration. The degradable fraction (63.59 vs. 22.46%) and the rate of disappearance of the CP (9.68 vs. 1.69%/h) were greater for the SBM compared with the BM concentrate. Cows fed the BM concentrate produced more milk (29.3 vs. 24.9 kg/d) and more milk protein (0.85 vs. 0.74 kg/d) than did those fed the SBM concentrate. Milk fat yield and percentages of milk fat, lactose and protein were not affected. Forage DMI was increased by BM (17.19 vs. 13.17 kg/d per cow). The in vivo responsiveness to lipolytic stimuli were increased by BM but enhanced body weight loss or higher plasma nonesterified fatty acids concentration were not observed. Results indicated that a concentrate with a high RUP content increased milk and milk protein yields when spring pasture was the sole forage. The highest milk yield was more likely caused by increased DM than by enhanced body lipid mobilization. |
| | |
Authors:
|
A Schor; G A Gagliostro |
Related Documents
:
|
1885388 - Differences among breed crosses of cattle in the conversion of food energy to calf weig... 15325768 - Risk factors for milk off-flavours in dairy herds from prince edward island, canada. 15905458 - The impact of cooling ponds in north central texas on dairy farm performance. 17044768 - The effect of lactose maldigestion on the relationship between dairy food intake and co... 10580758 - Effect of welding fume solubility on lung macrophage viability and function in vitro. 1885388 - Differences among breed crosses of cattle in the conversion of food energy to calf weig... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Journal of dairy science Volume: 84 ISSN: 0022-0302 ISO Abbreviation: J. Dairy Sci. Publication Date: 2001 Jul |
Date Detail:
|
Created Date: 2001-07-24 Completed Date: 2001-12-11 Revised Date: 2006-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
|
Languages: eng Pagination: 1597-606 Citation Subset: IM |
Affiliation:
|
Facultad de Agronomía, University of Buenos Aires, Argentina. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animal Feed Animals Cattle / metabolism, physiology* Dietary Proteins / administration & dosage*, metabolism Dietary Supplements Digestion Female Fermentation Lactation / physiology* Milk / chemistry* Milk Proteins / analysis Rumen / metabolism* Soybeans Time Factors |
| Chemical | |
Reg. No./Substance:
|
0/Dietary Proteins; 0/Milk Proteins |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Validation and comparison of analytical methods based on the release of p-nitrophenol to determine l...
Next Document: Short communication: Consumer evaluation of milk high in conjugated linoleic acid.