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Dairy cattle crossbreeding and milk production

100%

Slosarz J., Solarczyk P., Kunowska-Slosarz M., Nalecz-Tarwacka T., Golebiewski M., Wojcik A.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2016

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tom 55[2]

Dairy cattle crossbreedingand milk production.The aim of this study was to compare the results of milk performance of purebred Polish Holstein-Frisian (PHF) cows and their crossbreeds (PHF x SRB). Data for the analysis originated from the Polish Federation of Dairy Cattle Breeder and Producers - cows reports. The results indicate a positive influence of the breed on milk composition: fat, protein and dry matter content and somatic cell count. purebred Polish Holstein-Frisian (PHF) cows had significantly higher (p≤0.05) milk yield for both the 100 and 305 days milking. The milk production of MM cows is lower by 15.89%, at 100 days of lactation, and by 34.57% in the full lactation than PHF.

2

Organic dairy farming and its effect on milk quality and composition

88%

Barth K.

Animal Science Papers and Reports

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2004

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tom 22

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nr 3

3

Relationships between sire effect, milk production in young cows and their productive longevity

75%

Konsowicz K., Pogorzelska J., Micinski J., Sobotka W., Zwierzchowski G.

Medycyna Weterynaryjna

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2013

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tom 69

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nr 10

The objective of this study was to determine relationships between sire effect, milk production in young cows, their performance in subsequent lactations, fertility, conformation and productive longevity. A total of 1724 cows that first calved between 2003 and 2005 were analyzed during 4475 lactations. The cows were kept in 10 barns located in the Provinces of Pomerania and West Pomerania, Poland. The analysis covered 1085 daughters of 145 local Polish Holstein-Friesian (PHF) sires and 639 daughters of 128 imported Holstein-Friesian (HF) sires, including 437 cows culled after the first lactation, 445 cows culled after the second lactation and 140 long-lived cows. Research has shown that among first-calf heifers and the second lactation cows more than 55% of daughters of imported bulls and about 48.75% of daughters of domestic bulls were culled. Essentially higher results of sort ratings concerning the overall appearance, body conformation, udder quality and frame size, efficiency of milk and its components were acquired after the imported bulls. High milk production levels, exceeding 8000 kg of milk in the first and second lactation, had an adverse effect on the productive life of cows. A correlation between milk production of milk cows and their productive longevity was proved as evidenced by the fact that cows which were used for at least five lactations produced less milk and its components as the first-calf heifers than cows which were scrapped later.

4

Wpływ częstości doju na wydajność i skład mleka krów za pierwsze 100 dni laktacji

75%

Weglarzy K., Bereza M., Szarek J.

Prace i Materiały Zootechniczne

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2009

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tom 67

5

Effect of age and heat term and length on magnesium content in mares' milk

75%

Pieszka M., Kulisa M.

Journal of Elementology

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2005

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tom 10

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nr 4 Suppl.1

80

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Relationship of somatic cell count with milk yield and composition in the herds of Black-and-White cattle

75%

Juozaitiene V., Zakas A., Juozaitis A.

Medycyna Weterynaryjna

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2004

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tom 60

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nr 07

701-704

7

Changes in cow’s milk composition and physical properties during the uninterrupted milking process

75%

Dymnicki E., Golebiewski M., Wojcik A., Puppel K., Kuczynska B., Sosin-Bzducha E., Szulc T.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2015

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tom 54[1]

Changes in cow’s milk composition and physical properties during the uninterrupted milking process. The chemical composition of milk determines the nutritional value and technological properties of milk and dairy products. Many studies have been performed on the chemical composition of milk, including fatty acid and protein profile, however a limited number of investigations have determined the changes in chemical composition of the milk during the milking process. Experiment were designed to study changes in milk chemical composition (i.e. fat, protein, casein, lactose, urea, citric acid, Total Solids (TS), Solids-Non-Fat (SNF), free fatty acids (FFA) as well as acidity, density, freezing point and somatic cell score) during the uninterrupted milking. Fifty two (455 samples) cows of 3 different breeds; with daily production 5-12 kg; were sampled during interrupted milking process. Representative sample were collected from each kg of milked liquid. There were significant (P≤0.01) changes in fat, FFA, lactose, TS and density of milk during milking. The concentration of fat, FFA, and TS shown increasing tendency with the course of milking, however, lactose and density presented opposite trends. Therefore, obtaining the whole quantity of milk from udder during the milking process, beside shaping the health status, is an indispensable step to produce milk of the highest quality in terms of its nutritional and technological value.

8

Milk yield and composition in cows fed rations with different energy and protein sources

75%

Strzetelski J., Krawczyk K., Kowalczyk J., Osieglowski S., Pustkowiak H.

Journal of Animal and Feed Sciences

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2001

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tom 10

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nr 4

9

Yield and composition of milk from Jersey cows as dependent on the genetic variants of milk proteins

75%

Micinski J., Klupczynski J., Mordas W., Zablotna R.

Polish Journal of Food and Nutrition Sciences

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2007

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tom 57

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nr 3[A]

The experiment was performed on 121 Jersey cows in the years 2003/2004. The aim of this study was to determine the yields of ECM, milk fat and milk protein as well as milk fat content and milk protein content during four successive 305-day lactations as dependent on the genotypes and polymorphic variants of milk proteins. Depending on their genotype, the cows were divided into the following groups: AA, AB, BB and BC. Four major milk proteins were obtained as a result of separation, i.e. LGB, CSN1S1, CSN2 and CSN3. The yields of ECM, milk fat and milk protein increased during four successive 305-day lactations. Cows with the polymorphic fractions LGB AA and AB, CSN1S1 BC, CSN2 AB and CSN3 AA were characterised by the highest productivity. The highest increase in fat content (0.63%) was recorded between the first and second lactation. The LGB AA genotype contributed to an increase in protein concentration, by 0.14%, 0.12% and 0.19% in the second, third and fourth lactation, respectively. In the case of the other fractions these values were as follows: CSN1S1 BC - 0.13%, 0.07% and 0.11% in the second, third and fourth lactation, respectively, CSN2 AA - 0.09%, 0.20%, 0.08% and 0.04% in the first, second, third and fourth lactation, respectively, and CSN3 BB - 0.11%, 0.16% and 0.10% in the second, third and fourth lactation, respectively.

10

Productivity of Simmental and Montbeliarde cows culled in 2005–2016 taking into account the reasons for their culling

63%

Zolkiewski P., Stanek P., Janus E.

Acta Scientiarum Polonorum. Zootechnica

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2018

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tom 17

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nr 1

11

Influence of herbal mixtures and zeolite additives to diets for sows on performance and milk composition

63%

Grela E. R., Panayiotou P. P., Matras J.

Polish Journal of Natural Sciences. Supplement

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2006

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tom 03

307-313

12

Effect of some selected factors on somatic cell concentration in milk of Jersey cows

63%

Antkowiak I., Pytlewski J., Kucera J.

Acta Scientiarum Polonorum. Zootechnica

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2003

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tom 02

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nr 2

9-17

13

Beta-lactoglobulin genetic variants in Simmental breed and its association with compositional properties and rennetability of milk

63%

Michalcova A., Krupova Z., Bulla J.

Prace i Materiały Zootechniczne

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2009

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tom 67

The protein composition and technological traits were investigated in Simentaler milk with genetic variants A or B of ß-lactoglobulin (ß-LG). Data were included from 78 cows from 3 dairy farms. Genotypes of ß-LG were determined by applying horizontal starch-gel electrophoresis with addition of urea and mercaptoethanol. In addition, fat, crude protein (CP), true protein (TP), casein (CN), whey protein (WP), non-protein nitrogen (NPN), lactose and calcium (Ca) content, casein number (CNno) and rennetability of milk from Slimental breed were examinated. The method of last squares means using the general linear model (GLM) was used for statistical analysis of data. The model included heard and genotypes of ß-LG as fixed effects. The genotypes of ß-LG had no significant association with fat, CP and TP content, while CN and WP content and CNno were significantly affected by the genotypes of ß-LG. The BB genotype of ß-LG was significantly associated with higher CN content and CNno. The positive effect of the allele B of ß-LG on rennetability was found out.

14

Milk yield and composition in relation to body weight of cows of four genotypes

63%

Antkowiak I., Pytlewski J.

Animal Science. Scientific Papers of Agricultural University of Poznan

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2003

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tom 05

The study compares milk, protein and fat yields of cows of four genotypes in relation to their body weight. The obtained results showed that Jersey cows were characterized by the highest milk, protein and fat productivity per 100 kg of body weight.

15

The changes in the milk composition and its lipid fraction during the rearing of lambs in non-milked sheep

63%

Radzik-Rant A., Rant W., Jankowska U., Kuznicka E.

Annals of Warsaw University of Life Sciences - SGGW. Animal Science

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2017

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tom 56[1]

The changes in the milk composition and its lipid fraction during the rearing of lambs in non-milked sheep. Studies regarding the effect of lactation stage on milk content and lipid fraction composition are mostly conducted on milked animals. The aim of this study was to analyze the changes in the basic milk composition and content of fatty acids in the fat fraction during the rearing of lambs in non-milked sheep. The study was carried out on 22 ewes of Polish lowland sheep of Żelazneńska strain, which reared lambs sold at low weight classes (up to 22 kg). Milk samples were collected at 10 (period 1), 25 (period 2) and 52 (period 3) days of lactation. There were no differences in the amount of the basic components of milk in the studied periods of lactation beside the fat (P≤ 0.05) content. There were also no difference in the content of fatty acid groups in the fat fraction of ewe’s milk examined at 10, 25 and 52 day of lactation.Although,in the third period of lactation, the content of saturated fatty acids (SFA) was slightlyhigher compared to first period. In turn, the content of oleic acid (P≥0.30) and C18:3 (P≤ 0.05) was higher in the 10 day of rearing then in 52 day. A slightly larger share of essential C18 unsaturated fatty acids in ewe’s milk in early lactation may suggest the involvement of adipose tissue in the formation of milk fat.

16

Effect of dry period length on dairy cows production level

63%

Weglarzy K.

Prace i Materiały Zootechniczne

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2009

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tom 67

17

Saccharomyces cerevisiae preparations in the feeding of cows and their effect on milk yield and composition as well as rumen microorganisms

63%

Dobicki A., Pres J., Zachwieja A., Kwasnicki R.

Electronic Journal of Polish Agricultural Universities. Series Animal Husbandry

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2006

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tom 09

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nr 4

18

Response of pregnant and lactating sows to reduced protein content in complete compound feed

63%

Gajewczyk P., Korniewicz D., Kolacz R., Dobrzanski Z., Korniewicz A.

Polish Journal of Veterinary Sciences

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2010

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tom 13

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nr 4

The experimental material consisted of 42 sows divided into 3 feeding groups, each containing 14 sows fed complete compound feed varying in protein content. Protein and amino acid content of the feed fed to the control group was in compliance with Polish standards. Protein content in the experimental groups was reduced by 10% and 20%, respectively. At the same time, lysine, methionine, threonine and tryptophane content was supplemented to the level of the control group. All pregnant and lactating sows were fed individually. The condition of the sows was determined by measuring the thickness of backfat at the P2 position on days 30 and 105 of pregnancy and on day 25 of lactation. The data analyzed in the study included: the total number of piglets born, their body weight gain, milk composition, weaning-to-estrus interval and the farrowing rate. Protein content of the compound feed did not have a significant impact on the increment in backfat during pregnancy and losses during lactation. The sows fed compound feed with reduced protein content gave birth to 0.7 and 0.6 less piglets per litter than the control animals. However, due to lower losses, they bred 0.3 and 0.4 more piglets than the control sows. Average body weight of a piglet on day 21 was 0.5 kg lower in the experimental than in the control group. Dry matter, protein, fat and lactose content of the sow’s milk did not depend on protein content of the feed. The weaning-to-estrus interval in the experimental groups was one day longer than in the control group. The reproductive rate accounted for 86% and was comparable in all the groups.

19

The effect of age at first calving and length of interpregnancy period on the yield and composition of milk in Black-and-White cows

63%

Pytlewski J., Antkowiak I., Dorynek Z.

Animal Science. Scientific Papers of Agricultural University of Poznan

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2006

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tom 08

20

Effect of supplementing dairy cows with live yeasts cells and dried brewer’s yeasts on milk chemical composition, somatic cell count and blood biochemical indices

63%

Kuczaj M., Pres J., Zachwieja A., Twardon J., Orda J., Dobicki A.

Electronic Journal of Polish Agricultural Universities. Series Veterinary Medicine

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2014

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tom 17

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nr 3

Ograniczanie wyników

Dairy cattle crossbreeding and milk production

Organic dairy farming and its effect on milk quality and composition

Relationships between sire effect, milk production in young cows and their productive longevity

Wpływ częstości doju na wydajność i skład mleka krów za pierwsze 100 dni laktacji