Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet.

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Abstract Text:

S Couvreur,C Hurtaud,P G Marnet,P Faverdin,J L Peyraud,

The objective of this study was to examine the synthesis and composition of milk produced by dairy cows that secrete either small milk fat globules (SMFG) or large milk fat globules (LMFG), and to study their response to diets known to alter milk composition. Four groups of 3 multiparous dairy cows were assigned to 2 isoenergetic feeding treatments: a corn silage treatment supplemented with soybean meal, and fresh pasture supplemented with cereal concentrate. The 4 groups comprised 2 groups of 3 dairy cows that produced SMFG (3.44 microm) and 2 groups of 3 dairy cows that produced LMFG (4.53 microm). The SMFG dairy cows produced higher yields of milk, protein, and calcium. Nevertheless, their milk had lower fat and protein contents. Both SMFG and LMFG cows secreted similar amounts of milk fat; therefore, higher globule membrane contents in milk fat were observed in SMFG cows. Higher calcium mineralization of the casein micelles in SMFG cows suggests that it may be possible to improve cheese-making properties even if the lower protein content may lead to lower cheese yields. The SMFG cows secrete milk fat with a higher concentration of monounsaturated fatty acids and a lower concentration of short-chain fatty acids. They also have a higher C18:1/C18:0 ratio than LMFG cows. This suggests that SMFG cows have more significant fatty acid elongation and desaturation. The pasture treatment led to an increase in milk and protein yields because of increased energy intake. It also resulted in lower milk fat yield and fat and protein contents. The pasture treatment led to a decrease in milk fat globule size and, as expected, an increase in monounsaturated and polyunsaturated fatty acid contents. However, it induced a decrease in the protein content, and in calcium mineralization of casein micelles, which suggests that this type of milk would be less suitable for making cheese. This study also shows that there is no correlation between the cows, based on milk fat globule size and diet. These results open up possibilities for improving milk fat quality based on milk fat globule size, and composition. The mechanisms involved in milk fat globule secretion are still to be determined.

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Publishing Authors By Initials

S Couvreur,C Hurtaud,PG Marnet,P Faverdin,JL Peyraud,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of dairy science

VOLUME: 90

Page Numbers: 392-403

Journal Abbreviation: J. Dairy Sci.

ISSN: 1525-3198

DAY: 21

MONTH: Jan

YEAR: 2007

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 2985126

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet.

AFFILIATION: Unité Mixte de Recherches INRA-Agrocampus Rennes Production du Lait, Domaine de la Prise, 35590 Saint-Gilles, France.

Country: United States

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Dairy Sci

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet Related Publications

• A CONTRAST IN ACTION.
• A boss you can look up to.
• A just and fair salary for D.A.'s.
• Adaptations of mammary uptake and nutrient use to once-daily milking and feed restriction in dairy cows.
• Are you killing time?
• Clean up time.
• Composition of milk fat from cows selected for milk fat globule size and offered either fresh pasture or a corn silage-based diet.
• Creative cooperation.
• Credit for acccomplishment.
• Does the girl you see in the mirror differ very much from the D.A. the doctor and the patients see in the office?
• Effects of feeding camelina (seeds or meal) on milk fatty acid composition and butter spreadability.
• GOOD HOUSEKEEPING.
• How much is a dental assistant worth?
• How to keep your cool while those around you lose theirs.
• Intra-office jealousy.
• LOOKING AHEAD.
• More from Madison.
• No more ghosts for Tansy.
• PLAN YOUR SELF-IMPROVEMENT; NOT A PROBLEM, BUT A GOAL--FOR THE EARNEST DENTAL ASSISTANT.
• PROGRAM FOR SUMMER MONTHS.
• SAFEGUARD YOUR EMPLOYER'S PRACTICE. HOW TO AVOID ERRORS FOR WHICH YOUR EMPLOYER COULD BE HELD RESPONSIBLE.
• Should a D. A. specialize?
• THE OTHER BOYS IN THE FAMILY. HOW THE ASTUTE DENTAL ASSISTANT GETS ALONG WITH THE MEN FROM THE DENTAL SUPPLY HOUSE AND THE COMMERCIAL DENTAL LABORATORY.
• THE TIME WASTERS.
• Taming the monster in the chair.
• That admirable old Chinese custom.
• The dental assistant and the Christmas spirit.
• Those pesky gremlins.
• Your basic needs as a D.A.
• Your daily office battle.