Factors affecting the fat globule sizes during the homogenization of milk and cream

1964 ◽  
Vol 31 (2) ◽  
pp. 195-200 ◽  
Author(s):  
J. D. S. Goulden ◽  
L. W. Phipps
Keyword(s):  
Flow Rate ◽  
Milk Fat ◽  
Empirical Equation ◽  
Applied Pressure ◽  
Homogenization Temperature ◽  
Fat Content ◽  
Factors Affecting ◽  
Fat Globule ◽  
The Mean

SummaryThe homogenization of milk and cream with a piston-type homogenizer has been studied. An examination has been made of the influences upon the mean fat globule diameters of changes in milk fat content, flow rate and homogenization temperature. The results are discussed in terms of the variations in the parameters q and P0 of the empirical equation d = (P0/P)q relating the globule diameter d to applied pressure P.

scholarly journals Investigation of Non-Genetics Factors Affecting Milk-Fat Content and Milk-Fat Percentage Curves' Parameters In Azeri and Khuzestani Buffalo Breeds

2019 ◽  
Vol 10 (26) ◽  
pp. 113-121
Author(s):  
Karim Hasanpur ◽  
Seyad Abbas Rafat ◽  
Arash Javanmard ◽  
Davood Kianzad ◽  
◽  
...  
Keyword(s):  
Milk Fat ◽  
Fat Content ◽  
Fat Percentage ◽  
Factors Affecting

An analysis of the variation between dairy-sire progeny-groups for milk yield and fat content

1958 ◽  
Vol 1958 ◽  
pp. 19-29 ◽  
Author(s):  
Alan Robertson ◽  
S. S. Khishin
Keyword(s):  
Milk Yield ◽  
Comparison Method ◽  
Fat Content ◽  
Fat Percentage ◽  
Simple Method ◽  
Factors Affecting ◽  
Special Cases ◽  
The Mean ◽  
Milk Marketing ◽  
The Relationship

The past few years have seen the development in Great Britain of the ‘contemporary comparison’ method for evaluating progeny tests of dairy sires (Macarthur, 1954; Robertson, Stewart and Ashton 1956). The final overall figure attached to a sire is the mean difference between the yield of his daughters and that of other heifers milking in the same herd in the same year, with due regard for the numbers of animals in the two groups. Although it has some imperfections in special cases, this is probably the most informative simple method of evaluating a sire for yield and, fortunately, one which could be easily integrated with the existing recording system. The method has been turned into a simple routine in the Bureau of Records of the Milk Marketing Board and several thousand bulls have now been evaluated. In this paper, we shall be mostly concerned to use this material to investigate the heritabilities of milk yield and fat content and the relationship between the two in the different breeds. The information that we shall use consists, for each bull, of the mean contemporary comparison, with its effective ‘weight’, and the average fat percentage of the daughters. Before we deal with the observed results, we should go into rather more detail into the nature of these two figures and into the factors affecting them.

A simple spectroturbidimetric method for the determination of the fat content of homogenized ice-cream mixes

1962 ◽  
Vol 29 (1) ◽  
pp. 47-53 ◽  
Author(s):  
J. D. S. Goulden ◽  
P. Sherman
Keyword(s):  
Standard Deviation ◽  
Ice Cream ◽  
Fat Content ◽  
Fat Globule ◽  
The Mean ◽  
Simple Filter

SummaryA rapid spectroturbidimetric method for the determination of the fat content of homogenized ice-cream mixes using a simple filter absorptiometer has been devised. Turbidities are measured at two different wavelengths to allow for changes in the degree of homogenization. The standard deviation of the differences from the values obtained by the Werner-Schmid method was found to be 2·5% of the mean fat content value. The method also enables the mean fat globule diameter to be determined.

scholarly journals Milk Fat Content and DGAT1 Genotype Determine Lipid Composition of the Milk Fat Globule Membrane

PLoS ONE ◽  
2013 ◽  
Vol 8 (7) ◽  
pp. e68707 ◽  
Author(s):  
Nurit Argov-Argaman ◽  
Kfir Mida ◽  
Bat-Chen Cohen ◽  
Marleen Visker ◽  
Kasper Hettinga
Keyword(s):  
Lipid Composition ◽  
Milk Fat ◽  
Fat Content ◽  
Milk Fat Globule Membrane ◽  
Milk Fat Globule ◽  
Fat Globule

460. Studies of the secretion of milk of low fat content by cows on diets low in hay and high in concentrates: I. The effect of variations in the amount of hay

1952 ◽  
Vol 19 (1) ◽  
pp. 39-50 ◽  
Author(s):  
C. C. Balch ◽  
D. A. Balch ◽  
S. Bartlett ◽  
C. P. Cox ◽  
S. J. Rowland
Keyword(s):  
Iodine Value ◽  
Milk Fat ◽  
Softening Point ◽  
Control Diet ◽  
Experimental Treatment ◽  
Fat Content ◽  
Control Group ◽  
Saponification Value ◽  
Concentrate Mixture ◽  
The Mean

1. Twelve Shorthorn cows were used for an investigation into the effect of diets low in roughage and high in concentrates on the fat content of milk.2. An experiment was conducted with initial and final control periods. During the control periods all the cows received daily 17 to 21 lb. of hay, 30 lb. of mangolds and 4 lb. of a balanced concentrate mixture per 10 lb. of milk. In the period of experimental treatment, lasting 4 weeks, a control group of four cows remained on this diet. Two other similar groups received daily only 6 and 2 lb. of hay, but this was supplemented with 9 lb. of a concentrate mixture low in fibre and protein. The same allowances of mangolds and of concentrates for production were given to these as to the control group.3. The mean fat content of milk produced in the last 2 weeks of the period of experimental treatment by cows receiving the diets low in roughage was 0·49 % (group receiving 6 lb. of hay) and 0·59% (group receiving 2 lb. of hay) below that produced by the cows receiving the control diet, these differences being statistically significant. In the group receiving daily 6 lb. of hay the drop in fat content was accompanied by an increase in the yield of milk and there was only a small fall in the yield of milk fat, but in the group receiving daily 2 lb. of hay there was a significant fall in the yield of fat. The latter fall represented a loss of 18·9% of the fat as compared with the control group. The fat content of the milk and the yield of milk rapidly returned to normal when the cows reverted to 18 lb. of hay per day.4. The butterfat produced by the cows receiving diets low in roughage had a higher iodine value and lower softening point than that from the control cows. The fat from the group receiving daily 2 lb. of hay, but not that from the group receiving 6 lb. of hay, had a distinctly lower Reichert value than fat from the control group. The treatments caused no change in the saponification value.5. The level of solids-not-fat in the milk was not affected by reduction in the roughage intake.

THE IMPORTANCE OF PROLACTIN FOR LACTATION IN THE EWE

1978 ◽  
Vol 79 (3) ◽  
pp. 301-310 ◽  
Author(s):  
R. D. HOOLEY ◽  
JEANETTE J. CAMPBELL ◽  
J. K. FINDLAY
Keyword(s):  
Plasma Concentration ◽  
Protein Content ◽  
Milk Yield ◽  
Milk Fat ◽  
Fat Content ◽  
Milk Secretion ◽  
Dexamethasone Treatment ◽  
Priming Phase ◽  
The Mean

The effect of 2-bromo-α-ergocryptine (bromocriptine) on the induction, initiation and maintenance of milk secretion was studied in post-parturient ewes and in ovariectomized ewes artificially induced to lactate by treatment with oestrogen plus progesterone and then dexamethasone. Treatment with bromocriptine (about 0·4 mg/kg every 3 days) lowered and maintained the plasma concentration of prolactin at < 12 ng/ml. Ewes receiving bromocriptine concurrently with oestrogen plus progesterone during the priming phase had a significantly lower (P< 0·05) mean cumulative milk yield than control ewes, although the milk of the treated ewes contained normal amounts of fat, protein and lactose. Administration of bromocriptine during dexamethasone-induced lactogenesis had no significant effect on the mean cumulative milk yield but significantly (P<0·05) increased the milk fat and protein content. In established lactation, bromocriptine markedly reduced the milk yield in both intact and ovariectomized ewes. The concentration of protein was not significantly affected although the milk fat content was higher in the bromocriptine-treated than in the control ewes. The effects of bromocriptine on milk yield and composition during galactopoiesis could be reversed by concurrent infusion of prolactin and the results suggest that prolactin is an important hormone during mammogenesis and galactopoiesis in the sheep.

scholarly journals Evaluation of Factors Affecting Colostrum Quality and Quantity in Holstein Dairy Cattle

Animals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 2005
Author(s):  
Aikaterini Soufleri ◽  
Georgios Banos ◽  
Nikolaos Panousis ◽  
Dimitrios Fletouris ◽  
Georgios Arsenos ◽  
...  
Keyword(s):  
Large Scale ◽  
Linear Models ◽  
Fat Content ◽  
Time Interval ◽  
Factors Affecting ◽  
Significant Negative Effect ◽  
Energy Needs ◽  
Negative Effect ◽  
The Mean ◽  
Positive Effect

The objective of this study was to conduct a large-scale investigation of colostrum composition and yield and an evaluation of factors affecting them. In this study, 1017 clinically healthy Holstein cows from 10 farms were used. The colostrum TS were measured using a digital Brix refractometer. Fat, protein and lactose content were determined using an infrared Milk Analyzer. Statistical analysis was conducted using a series of univariate general linear models. The mean (±SD) percentage of colostrum fat, protein, lactose and TS content were 6.37 (3.33), 17.83 (3.97), 2.15 (0.73) and 25.80 (4.68), respectively. Parity had a significant positive effect on the protein and TS content and a negative one on fat content. The time interval between calving and colostrum collection had a significant negative effect on the fat, protein and TS contents and a positive one on lactose. Colostrum yield had a significant negative effect on the protein and TS content, and it was affected by all factors considered. In addition to TS, the evaluation of the colostrum fat content appears essential when neonates’ energy needs are considered. The Brix refractometer, an inexpensive and easy to use devise, can be used effectively in colostrum quality monitoring.

scholarly journals Factors affecting goat milk fat yield

2017 ◽  
Vol 24 (3) ◽  
Author(s):  
Evaldas Šlyžius ◽  
Birutė Šlyžienė ◽  
Vaida Lindžiūtė
Keyword(s):  
Milk Fat ◽  
Goat Milk ◽  
Fat Content ◽  
Dairy Goat ◽  
Dairy Goats ◽  
Factors Affecting ◽  
Stage Of Lactation ◽  
Goat Population ◽  
Main Factors ◽  
Fat Yield

The objective of the paper was to investigate the main factors determining the yield of fat in goat milk in the dairy goat population of Lithuania. The research was carried out on a total of 1,079 dairy goats (4 breeds: Czech White Shorthaired (n = 610), Saanen (n = 364), Lithuanian native (n = 94) and Anglo-Nubian (11)) in 7 dairy farms. The average milk yield during lactation was 797.42 (±53.3) kg. The average milk fat content was 4.14% (±0.4). The research of the goat milk fat content demonstrated that the indicators investigated in different herds varied. The highest milk fat content in percent was determined among AngloNubian – 5.2%. The milk fat content of all breeds of goats increased with increasing the parity up to the 4–6th parity, respectively, and started decreasing then, after reaching the peak. While assessing the quantity of milk fat during the stage of lactation, the highest milk fat content was determined during the first months (4.5–4.7%) and at the end of lactation (4.5%). The research performed by us showed that such factors as breed, parity, stage of lactation and herd had an impact on the quantity of goat milk fat.

The use of marker enzymes to assay the churning of milk

1975 ◽  
Vol 42 (2) ◽  
pp. 241-246 ◽  
Author(s):  
D. J. Stannard
Keyword(s):  
Alkaline Phosphatase ◽  
Xanthine Oxidase ◽  
Milk Fat ◽  
Marker Enzymes ◽  
Milk Fat Globule Membrane ◽  
Factors Affecting ◽  
Assay Procedure ◽  
Milk Fat Globule ◽  
Fat Globule

SummaryThe release of the enzymes xanthine oxidase and alkaline phosphatase from the milk fat globule membrane is shown to be an index of milk churning. The factors affecting globule breakdown in relation to this assay procedure are discussed.

Sign in / Sign up

Export Citation Format

Share Document