scholarly journals Effect of silage type and concentrate level on conjugated linoleic acids, trans-C18:1 isomers and fat content in milk from dairy cows

2006 ◽  
Vol 46 (6) ◽  
pp. 699-712 ◽  
Author(s):  
Tina S. Nielsen ◽  
Ellen M. Straarup ◽  
Mogens Vestergaard ◽  
Kris Sejrsen
Keyword(s):  
Dairy Cows ◽  
Fat Content ◽  
Conjugated Linoleic Acids ◽  
Concentrate Level

COMPARATIVE DESCRIPTION OF MILK PRODUCTIVITY OF COWS UKRAINIAN RED-AND-WHITE DAIRY CATTLE AND UKRAINIAN BLACK-AND-WHITE DAIRY CATTLE AND HOLSTEIN BREEDS IN SERF «OLEKSANDRIVSKE»

2016 ◽  
Vol 52 ◽  
pp. 6-12 ◽  
Author(s):  
M. V. Gladiy ◽  
G. S. Kovalenko ◽  
S. V. Priyma ◽  
G. A. Holyosa ◽  
A. V. Tuchyk ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Dairy Cows ◽  
Milk Yield ◽  
Fat Content ◽  
Holstein Cows ◽  
Milk Productivity ◽  
Black And White ◽  
The Third ◽  
Fat Yield ◽  
Selection Of

The main goal of dairy breeds selection should be improving breeding and productive qualities of animals under modern conditions. The majority of farms, using native breeds to produce milk, has created optimal conditions for keeping and feeding, selection and matching, growing of replacements etc. Further improvement of created native dairy breeds for economically useful traits occurs at total use of purebred Holstein bulls (semen) of foreign selection. In order to realistically assess milk productivity (milk yield, fat content in milk and fat yield) of Ukrainian Black-and-White and Red-and-White Dairy cows should be conducted a comparative analysis of Holstein cows under the same conditions of feeding and keeping. It was established that Ukrainian Red-and-White Dairy cows were characterized by the highest milk yields for 305 days of all lactations, taken into account, the among three investigated breeds. Their milk yield during the first lactation was 5933 kg of milk, during the second – 6393 kg, the third – 6391 kg and during higher lactation – 6650 kg. Ukrainian Black-and-White Dairy cows were second by milk yield (except for the second lactation), during the first lactation – 5932 kg of milk, the third – 6462 kg and higher – 6541 kg, and Holstein cows were third, during the first lactation – 5794 kg of milk, the second – 6381 kg, the third – 6335 kg and higher – 6469 kg. The fat content was almost the same and varied within 3.49-3.58% in milk of Ukrainian Red-and-White Dairy cattle, 3.50-3.60% in milk of Ukrainian Black-and-White Dairy cattle and 3.50-3.56% in Holsteins’ milk. The difference between the breeds was within 0.01-0.04%. All the investigated breeds had predominance in fat yield for three lactations over standards of these breeds: Ukrainian Red-and-White Dairy cows from 75.1 to 93.4 kg, Ukrainian Black-and-White Dairy cows – 75.1-89.0 kg respectively and Holstein cows – 41.9-60.2 kg. It was found different level of positive correlation between milk yield and fat yield in all the cases and high correlation (r = 0.604-0.921, P < 0.001) in five cases (41.7%) Negative correlation coefficients indicate that selection of animals to higher milk yield in the herd will decrease the second trait – fat content in milk. Positive and highly significant correlation between milk yield and fat yield indicates that selection of cows in the herd to higher milk yields will increase fat yield. It was revealed that bulls were among the factors impacted the milk productivity (milk yield, fat content, fat yield) of three investigated breeds. So, the force (η²x) of father’s impact on milk yield was15.4-47.9%, fat content – 22.0-43.4% and fat yield – 14.9-47.7% taking into account a lactation and a breed. The force of lines impact (η²x) was second; it was on milk yield 6.1-24.5%, fat content – 4.1-17.1 and fat yield – 5.8-23.5%. The force of breeds impact (η²x) was last; it was on milk yield 0.3-2.9%, fat content – 0.2-0.3% and fat yield – 0.6-2.7%. So, the comparative studies of milk productivity of Ukrainian Red-and-White and Black-and-White Dairy cattle with Holsteins indicate that under similar conditions of feeding and keeping, these native breeds can compete with Holstein cattle. The milk yield for 305 days of higher lactation was 6650 kg of milk in Ukrainian Red-and-White Dairy cows, 6541 kg in Ukrainian Black-and-White Dairy cows and 6469 kg in Holsteins. It was found the inverse correlation r = -0.025-0.316 between milk yield and fat content in milk in most cases. Selection and matching of animals in the herd should be carried out simultaneously on these traits. It was found positive repeatability of milk yields between the first and second, the third and higher lactations (rs = 0.036-0.741), indicating the reliability of forecasting increase in milk productivity during the next lactations in all herd. Bulls have the greatest impact (η²x) on milk productivity among the factors taken into account: milk yield – 15.4-47.9%, fat content in milk – 22.0-43.4% and fat yield – 14.9-47.7%.

Supplementation with Ca salts of soybean oil interacts with concentrate level in grazing dairy cows: intake, ingestive behavior, and ruminal parameters

2016 ◽  
Vol 48 (8) ◽  
pp. 1593-1598 ◽  
Author(s):  
Fernanda Lopes Macedo ◽  
Fernanda Batistel ◽  
Jonas de Souza ◽  
Lucas Jado Chagas ◽  
Flávio Augusto Portela Santos
Keyword(s):  
Soybean Oil ◽  
Dairy Cows ◽  
Ingestive Behavior ◽  
Grazing Dairy Cows ◽  
Concentrate Level

scholarly journals Variation in fat content between liver lobes and comparison with histopathological scores in dairy cows with fatty liver

2017 ◽  
Vol 13 (1) ◽  
Author(s):  
C. Gerspach ◽  
S. Imhasly ◽  
R. Klingler ◽  
M. Hilbe ◽  
S. Hartnack ◽  
...  
Keyword(s):  
Fatty Liver ◽  
Dairy Cows ◽  
Fat Content

Histological measurement of fat content of liver of dairy cows

1985 ◽  
Vol 95 (3) ◽  
pp. 437-441 ◽  
Author(s):  
R.A. Collins ◽  
I.M. Reid ◽  
L.A. Williams ◽  
P.F. Dennis
Keyword(s):  
Dairy Cows ◽  
Fat Content ◽  
Histological Measurement

scholarly journals Effects of Saccharomyces cerevisiae Culture on Ruminal Fermentation, Blood Metabolism, and Performance of High-Yield Dairy Cows

Animals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 2401
Author(s):  
Xiaoge Sun ◽  
Yue Wang ◽  
Erdan Wang ◽  
Shu Zhang ◽  
Qianqian Wang ◽  
...  
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Dairy Cows ◽  
Milk Yield ◽  
Inflammatory Cytokines ◽  
Rumen Fluid ◽  
Fat Content ◽  
High Yield ◽  
Control Group ◽  
And Performance ◽  
Basal Ration

High-yield dairy cows with high-concentrate diets are more prone to experiencing health problems associated with rumen microbial imbalance. This study assessed the effects of Saccharomyces cerevisiae culture (SC), a food supplement, on ruminal pH, volatile fatty acid (VFA), inflammatory cytokines, and performance of high-yield dairy cows. Forty Holstein cows with similar characteristics (e.g., milk yield, days of milk, and parity) were randomly divided into two groups: an experimental group fed the basal ration supplemented with the SC of 100 g of SC per cow per day (hour, SC group), and a control group fed the same basal ration diet without SC (i.e., CON group). On average, the supplementation of SC started at 73 days of lactation. The experimental period lasted approximately 70 days (from 18 January to 27 March 2020), including 10 days for dietary adaptation. Milk yield was recorded daily. Rumen fluid and milk samples were collected after 2 h of feeding in the morning of day 0, 15, 30, and 60. The data showed that rumen pH increased (p < 0.05) when cows were provided with SC. On average, the cows in the SC group produced 1.36 kg (p < 0.05) more milk per day than those in the CON group. Milk fat content of cows in the SC group was also higher (4.11% vs. 3.96%) (p < 0.05). Compared with the CON group, the concentration of acetic acid in the rumen fluid of dairy cows in the SC group was significantly higher (p < 0.05). There were no differences (p > 0.05) found in milk protein content and propionic acid between groups. The SC group had a tendency increase in butyric acid (p = 0.062) and total VFA (p = 0.058). The result showed that SC supplementation also enhanced the ratio between acetic and propionic. Most of the mean inflammatory cytokine (IL-2, IL-6, γ-IFN, and TNF-α) concentrations (p < 0.05) of the SC group were lower than CON group. This study demonstrated that high-yield cows receiving supplemental SC could produce more milk with higher fat content, have higher rumen acetate, and potentially less inflammatory cytokines.

scholarly journals The effect of number of lactation and concentrate level on feed intake and performance of dairy cows

1995 ◽  
Vol 44 (Suppl. 1) ◽  
pp. 264-264
Author(s):  
S. Mack ◽  
GU Lang ◽  
H. Steingass ◽  
A. Susenbeth ◽  
W. Drochner
Keyword(s):  
Dairy Cows ◽  
Feed Intake ◽  
And Performance ◽  
Concentrate Level

Transfer of conjugated linoleic acids into different tissues of dairy cows

2013 ◽  
Vol 67 (2) ◽  
pp. 119-133 ◽  
Author(s):  
Dirk von Soosten ◽  
Ronny Kramer ◽  
Gerhard Jahreis ◽  
Ulrich Meyer ◽  
Gerhard Flachowsky ◽  
...  
Keyword(s):  
Dairy Cows ◽  
Conjugated Linoleic Acids ◽  
Different Tissues

An examination of the effects of level of fish oil inclusion in the diet on rumen fermentation parameters in cattle

1998 ◽  
Vol 1998 ◽  
pp. 226-226
Author(s):  
C.S. Mayne ◽  
T.W.J. Keady ◽  
D A McConaghy
Keyword(s):  
Fish Oil ◽  
Dairy Cows ◽  
European Community ◽  
Milk Fat ◽  
Rumen Fermentation ◽  
Fat Content ◽  
Lactating Dairy Cows ◽  
Concurrent Study ◽  
Liquid Milk ◽  
Fermentation Parameters

The current milk quota regime within the European Community restricts both the volume and butterfat content of milk supplies from farms. Reduction in the butterfat concentration of milk enables an increase in liquid milk supplies, provided that the national butterfat base has been exceeded. In a concurrent study (Keady and Mayne, 1998) inclusion of fish oil in the diet of lactating dairy cows depressed butterfat content by up to 15 g/kg, consequently increasing the volume of milk which may be supplied in a quota situation by 0.27. The aim of the present study was to examine if the effects of fish oil inclusion on milk fat content were mediated via changes in rumen fermentation parameters.

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