Parition of riboflavin in cow's milk

1959 ◽  
Vol 26 (3) ◽  
pp. 277-280 ◽  
Author(s):  
V. V. Modi ◽  
E. C. Owen ◽  
R. A. Darroch
Keyword(s):  
Heart Rate ◽  
Milk Yield ◽  
Technical Assistance ◽  
Cow’S Milk ◽  
Marked Contrast ◽  
Cow's Milk ◽  
Initial Values ◽  
Slow Decline ◽  
Rate Of Decline

1. The partition of riboflavin between the free and the protein-bound forms was measured in the milk of six Ayrshire cows, three of which were treated with l-thyroxine.2. As lactation progressed there was a slow decline in the total riboflavin content of the milk for which the initial values were 0·86 to 1·09 µg./ml. milk. The rate of decline ranged from 0·01 to 0·003 µg./ml. milk per day.3. Thyroxine had its expected effects in stimulating milk yield and heart rate, and in preventing the rise of phosphatase in the milk as lactation progressed, but it did not affect either the concentration or the partition of riboflavin.4. Reasons are advanced for the marked contrast between the effect of thyroxine in increasing the phosphorylation of thiamine and the absence of any such effect on riboflavin.We thank Miss S. McLauchlan and Miss M. Lightbody for technical assistance, and Glaxo Laboratories Ltd., Greenford, Middlesex, for a gift of L-thyroxine.

Variation of freezing point of cow's milk free from extraneous water during lactation

2000 ◽  
Vol 25 ◽  
pp. 165-168
Author(s):  
B.A. Slaghuis ◽  
G.H. Klungel
Keyword(s):  
Milk Yield ◽  
Freezing Point ◽  
Bovine Milk ◽  
Cow’S Milk ◽  
Cow's Milk ◽  
Freezing Points ◽  
Stage Of Lactation ◽  
Lactation Curve ◽  
One Year ◽  
Morning Milk

AbstractThe freezing point of bovine milk is known to vary between narrow limits. However, some variation is possible, because of the osmotic relationship between blood and milk. The extent of variation in freezing points of cow's milk was studied. For one year, freezing points were determined in individual milk samples from a high producing herd. Differences (P<0.05) were found between evening and morning milk yield and freezing points. A ‘lactation curve’ for freezing points was fitted and showed some similarity with milk yield curves. Stage of lactation explained part of the variation of freezing points of cow's milk.

scholarly journals Genetic and environmental determinants of the urea level in cow's milk

2015 ◽  
Vol 58 (1) ◽  
pp. 65-72
Author(s):  
A. Czajkowska ◽  
B. Sitkowska ◽  
D. Piwczyński ◽  
P. Wójcik ◽  
S. Mroczkowski
Keyword(s):  
Genetic Correlation ◽  
Milk Yield ◽  
Dominant Role ◽  
Winter Season ◽  
Small Degree ◽  
Cow’S Milk ◽  
Urea Level ◽  
Cow's Milk ◽  
Urea Content ◽  
Selected Traits

Abstract. This study was conducted on a sample of 2237 Polish Holstein-Friesian cows. The aim was to estimate the effect of selected environmental factors on the level of urea in cow's milk and on its genetic parameters, i.e. the heritability coefficients, and genetic correlation with other selected traits of milk production. The present study has revealed the existence of a highly significant influence of herd, year of calving, parity, lactation phase, and milk performance level on the urea content in cow's milk. A high urea level in milk was detected in samples collected from older animals, both during the winter season and the middle phase of lactation (101–200 days). The heritability estimates were generally at a low level, particularly in terms of milk yield (0.183) and urea content (0.152–0.159), which may indicate the dominant role of the environment in shaping them. Relatively low values of genetic correlation (−0.097–0.140) between the urea content and other traits suggest that improvement of milk yield and its composition modify the urea level in milk only to a small degree.

scholarly journals INFLUENCE OF SELENIUM-CONTAINING PREPARATIONS ON COW'S MILK WITH INCREASED TECHNOGENIC LOAD ON AGROSYSTEMS

2021 ◽  
Vol 247 (3) ◽  
pp. 34-36
Author(s):  
R.А. Volkov ◽  
◽  
D.V. Portnov ◽  
Yu.V. Larina ◽  
◽  
...  
Keyword(s):  
Protein Content ◽  
Milk Yield ◽  
Fat Content ◽  
Cow’S Milk ◽  
Qualitative Composition ◽  
Milk Productivity ◽  
Experimental Animals ◽  
Cow's Milk ◽  
Daily Milk Yield ◽  
Daily Milk

Feeding experimental animals with supplements containing selenium in various forms and doses did not have a significant effect on milk productivity and the qualitative composition of milk. However, when using «Sel-Plex», there is a tendency to increase the average daily milk yield in terms of basic fat content by 0.9-4.4 % and an increase in the protein content in milk by 1.2-2.3 % compared to control.

The effect of bacterial infections of the udder on the yield and composition of cow's milk

1966 ◽  
Vol 33 (2) ◽  
pp. 199-215 ◽  
Author(s):  
J. V. Wheelock ◽  
J. A. F. Rook ◽  
F. K. Neave ◽  
F. H. Dodd
Keyword(s):  
Sodium Chloride ◽  
Milk Yield ◽  
Bacterial Infections ◽  
Complete Recovery ◽  
Cow’S Milk ◽  
Streptococcus Dysgalactiae ◽  
Dry Period ◽  
Cow's Milk

SummaryThe effect of bacterial infections, produced by infusions of Streptococcus dysgalactiae and of Staphylococcus pyogenes into one quarter of the udder, on milk yield and composition in heifers has been investigated. After a quarter became infected there was invariably a decrease in the yield of milk and in the concentrations of lactose and potassium, while there was an increase in those of sodium, chloride and non-casein proteins. These effects persisted into the 2nd lactation if the infection was not eliminated. If the infection was eliminated during the 1st lactation or during the dry period before 2nd calving there was a complete recovery in the composition of the milk in the 2nd lactation, but the recovery in milk yield was not complete.

scholarly journals Increasing the value of raw bulk milk quality based on mammary glands as production units vs. the udder in dairy cows with mastitis

2019 ◽  
Author(s):  
Gabriel Leitner ◽  
Yaniv Lavon ◽  
Uzi Merin ◽  
Shamay Jacoby ◽  
Shlomo E. Blum ◽  
...  
Keyword(s):  
Milk Yield ◽  
Cow Milk ◽  
Cow’S Milk ◽  
Streptococcus Dysgalactiae ◽  
Clotting Time ◽  
Cow's Milk ◽  
Bulk Milk ◽  
Whole Milk ◽  
Raw Bulk Milk ◽  
Lower Magnitude

AbstractThe current study measured the influence of milk of subclinically infected glands by different bacteria species on the cow’s milk and suggests different parameters for milk payment. The effects of bacterial infection or inflammation on gland milk yield were related to the bacteria species that caused the infection. The volume of milk of the inflamed gland from the cow’s milk yield was significantly lower (P<0.001) for the glands previously infected byEscherichia coli(PIEc) and those infected withStreptococcus dysgalactiae.Coagulation properties, rennet clotting time (RCT) and curd firmness (CF) also depended on the bacteria causing the infection. RCT values of all the inflamed glands were significantly longer (P<0.001) and CF values were significantly lower than that of the healthy ones. Moreover, in the whole milk, CF was also significantly lower and not proportional to the volume of the milk from the inflamed gland of the cow’s milk. Calculating the predicted 40% dry matter curd weight (PCW) on the cow level, including the healthy and inflamed glands or the healthy glands alone, found that for 9 of 13 PIEc cows, the presence of the affected gland’s milk in the whole cow milk resulted in a negative PCW value. Likewise, 5 of 20 cows infected byS. dysgalactiaehad negative delta values. Unlike the latter bacteria, PCW from milk of glands infected with CNS increased, although in a lower magnitude than in the healthy glands. No correlation was found between logSCC in the whole cow milk (healthy and inflamed glands) and PCW.

On Effectiveness of Age Correction Factors for Cow's Milk Yield

1966 ◽  
Vol 37 (2) ◽  
pp. 66-70
Author(s):  
Takeo ABE ◽  
Masayuki JIMBU ◽  
Akira NISHIDA
Keyword(s):  
Milk Yield ◽  
Cow’S Milk ◽  
Correction Factors ◽  
Cow's Milk ◽  
Age Correction

The effect of milking throughout the whole of pregnancy on the composition of cow's milk

1965 ◽  
Vol 32 (3) ◽  
pp. 249-254 ◽  
Author(s):  
J. V. Wheelock ◽  
J. A. F. Rook ◽  
F. H. Dodd
Keyword(s):  
Milk Yield ◽  
Current Knowledge ◽  
Late Pregnancy ◽  
Sharp Peak ◽  
Cow’S Milk ◽  
Dry Period ◽  
Cow's Milk ◽  
Proteose Peptone

SummaryThe changes in yield and composition of milk when 4 cows were milked throughout the whole of pregnancy have been studied. The yield decreased to a minimum 1–20 days before parturition and then gradually increased. The changes in composition before parturition were similar to those observed in late lactation but more pronounced. The content of proteose-peptone plus globulin increased in late pregnancy with a sharp peak, of about 5 times the value observed in mid-lactation, within the last 10 days before parturition, and then decreased rapidly. After parturition milk yield increased rapidly and the changes in composition were less marked than in animals with the usual ‘dry period’. The results are discussed in relation to current knowledge of colostrum formation.

scholarly journals Effects of calf separation and injection of oxytocin on milk performance and milk composition of the Polish Red cows

2013 ◽  
Vol 56 (1) ◽  
pp. 882-891
Author(s):  
E. Dymnicki ◽  
E. Sosin-Bzducha ◽  
M. Gołębiewski
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Milk Composition ◽  
Fat Content ◽  
Cow’S Milk ◽  
Low Fat ◽  
Cow's Milk ◽  
Milk Performance ◽  
Standard Composition

Abstract. The aim of this study was to analyse the yield and composition of milk from Polish Red cattle after 12-hour isolation of calves. Sixty six Polish Red cows were kept together with calves. Control milkings were carried out once a month after 12-hour isolation of calves. Five subsequent milkings after calving were taken under consideration. In the season (May–July 2012) oxytocin (OXT, 1 ml, 3 min before control milking) was injected. The milk of cows milked mechanically after 12-hour isolation of calves was characterized by a very low fat content (0.47–0.58 %) depending on the month after calving. There were no differences in protein and lactose content compared to the standard composition of cow’s milk. The milk yield was 6.16 kg in the first milking after calving and 3.55–4.01 kg in the four further milkings. After administration of OXT a significant increase of milk was observed in the first (12.9 kg) and subsequent months of lactation (8.5–12.4 kg). Milk fat content was significantly higher (4.14 % in the first and 3.39–3.86 % in the further milkings).

Sign in / Sign up

Export Citation Format

Share Document