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1
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

The effect of age at first calving on the milking performance of primiparous Jersey cows

100%
Pytlewski J., Antkowiak I. R.
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego
|
2021
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tom 17
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nr 2
2

Milk proteins of Jersey cows

75%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2003
|
tom 05
The examined population of Jersey cows was characterised by the occurrence of three genotypes of the casein protein fraction and four genotypes of whey protein.
3

Introductory of investigations viability at birth of Jersey calves

75%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2004
|
tom 06
4

Calf wastage in rearing of Jersey calves

75%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2006
|
tom 08
5

Milk processing value of Jersey cows and their hybrids

75%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2003
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tom 05
The assessed milk was derived from cows of Jersey breed and their crosses. Milk technological usefulness was determined on the basis of experimental production of cottage cheese using two methods of production: acid-rennin and acid.
6
Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik
Content available

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
|
2007
|
tom 57
|
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.
7

The course of calving in Jersey cows

63%
Antkowiak I., Pytlewski J.
Acta Scientiarum Polonorum. Zootechnica
|
2003
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tom 02
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nr 2
3-8
8

A comparison of somatic cell counts and urea levels in milk of Jersey and Polish Holstein-Friesian Black-and-White cows kept under identical environmental conditions

63%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2006
|
tom 08
9

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
|
2003
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tom 02
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nr 2
9-17
10

The effects of polymorphisms in DGAT1, GH and GHR genes on reproduction and production traits in Jersey cows

63%
Komisarek J., Michalak A., Walendowska A.
Animal Science Papers and Reports
|
2011
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tom 29
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nr 1
The aim of the study was to examine the impact of four single nucleotide polymorphisms in DGAT1, GH and GHR genes on reproduction, production and udder health in Jersey cattle. The study was conducted on 209 cows from the Polish active dairy population and genotypes were identified using the PCR-RFLP technique. The significant effects on certain of analysed traits were revealed of GHL127V and GHR-F279Y polymorphisms. Replacement of the phenylalanine encoding T allele by the tyrosine encoding A variant at GHR-F279Y locus led to decrease in milk, fat and protein yields. The GH-L127V-CC genotype was found to be significantly associated with the shorter calving interval and shorter interval from calving to conception than the other two GH genotypes. No relations were found between DGAT1-K232A mutation and health or reproductive traits of cows.
11

A comparison of the course of delivery and sex frequency calves in Jersey cows and in Black-and-White x Holstein-Friesian crosses

63%
Antkowiak I., Pytlewski J., Dorynek Z.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2006
|
tom 08
12

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
|
2003
|
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.
13

The relationship between the T945M single nucleotide polymorphism in the leptin receptor gene (LEPR) and milk production traits in Jersey cows

63%
Komisarek J., Dorynek Z.
Animal Science Papers and Reports
|
2006
|
tom 24
|
nr 4
14

The relationship between leptin gene polymorphisms and reproductive traits in Jersey cows

63%
Komisarek J., Antkowiak I.
Polish Journal of Veterinary Sciences
|
2007
|
tom 10
|
nr 4
The aim of the study was to analyse the relationship between three leptin gene polymorphisms, and indices of reproductive performance – age at first calving, days open, calving interval, number of inseminations per conception, and gestation length in Jersey cattle. A total of 219 cows were tested for the R4C, A59V and C(-963)T mutations using the PCR-RFLP technique. The following allele frequencies were found: R4C – 0.80 (C) and 0.20 (T), A59V – 0.67 (C) and 0.33 (T), C(-963)T – 0.83 (C) and 0.17 (T). The statistically significant correlation (P ≤ 0.05) was found only for the A59V mutation. Cows with the TT genotype were characterized by shorter calving interval and time of days open than animals with CT and CC genotype. Also, the number of inseminations per conception was lower in A59V – TT homozygotes compared with two other genotypes. The association analysis did not reveal any significant correlations for both R4C and C(-963)T polymorphisms.
15

Preliminary investigations on the effect of paternal group on the course of parturition, live weight of calf and selected reproduction indexes in Jersey cows

63%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2005
|
tom 07
16

The importance of genotype-environment interaction in genetic evaluation of dairy cattle in conditions of warm climate zone

63%
Skrzypek R.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2002
|
tom 04
17

Heterosis estimates for birth weight in crossbred dairy cattle

63%
Skrzypek R.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2002
|
tom 04
18

A comparison of selected reproduction indexes of Jersey cows with those of Black-and-White x Holstein-Friesian crosses

51%
Antkowiak I., Pytlewski J.
Animal Science. Scientific Papers of Agricultural University of Poznan
|
2006
|
tom 08
19

Health state of the mammary gland based on somatic cell counts and urea level in milk of Jersey and Polish Holstein-Friesian cows of Black-and-White variety

51%
Antkowiak I., Pytlewski J., Dorynek Z.
Roczniki Naukowe Polskiego Towarzystwa Zootechnicznego
|
2007
|
tom 03
|
nr 4
111-117
20

Associations between lactoferrin gene polymorphism and somatic cell count in milk and milk production traits in Jersey cws

51%
Wojdak-Maksymiec K., Kmiec M., Sapikowski S.
Folia Universitatis Agriculturae Stetinensis. Agricultura, Alimentaria, Piscaria et Zootechnica
|
2007
|
tom 01
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