Wyniki wyszukiwania

1

The length of interpregnancy period vs. longevity and selected production factors of Black-and-White cows

100%

Pytlewski J., Antkowiak I., Stanislawski D.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2006

|

tom 08

2

A comparison of daily milk yields of cows in indoors keeping and free stall management systems

100%

Antkowiak I., Pytlewski J.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2006

|

tom 08

3

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

100%

Juozaitiene V., Zakas A., Juozaitis A.

Medycyna Weterynaryjna

|

2004

|

tom 60

|

nr 07

701-704

4

Abnormal segregation of prion protein octapeptide-repeat alleles in cattle

100%

Walawski K., Czarnik U., Wojciechowski R., Pareek C. S.

Journal of Applied Genetics

|

2003

|

tom 44

|

nr 3

5

Sensory traits of 13 culinary cuts obtained from carcasses of young Black-and-White slaughter cattle

100%

Grzeskowiak E., Borzuta K., Wichlacz H., Strzelecki J.

Animal Science Papers and Reports. Supplement

|

2002

|

tom 20

|

nr 1

6

New SSCP polymorphism within bovine STAT5A gene and its associations with milk performance traits in Black-and-White and Jersey cattle

100%

Brym P., Kaminski S., Rusc A.

Journal of Applied Genetics

|

2004

|

tom 45

|

nr 4

7

Slaughter value of Black-and-White bulls finished on a reduced energy diet

100%

Chaberski R., Oler A.

Annals of Animal Science

|

2004

|

tom 04

|

nr 1

8

Correlations between genetic variants of milk proteins and milk yield and composition in first full lactations of Black-and-White cows

100%

Pytlewski J., Antkowiak I., Dorynek Z.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2002

|

tom 04

9

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

84%

Antkowiak I., Pytlewski J.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2006

|

tom 08

10

The effect of genotype and of some selected factors on the content of somatic cells and productive traits of Black-and-White cows in the Wielkopolska region

84%

Pytlewski J., Antkowiak I., Kucera J.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2003

|

tom 05

11

Vzah vybranych ukazatelu mlecne uzitkovosti u soboru bojnic cernostrakateho plemene na jednotlivych laktacich

84%

Chladek G., Kucera J.

Zeszyty Naukowe Akademii Rolniczej we Wrocławiu. Konferencje

|

1998

|

tom 17

12

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

84%

Antkowiak I., Pytlewski J., Dorynek Z.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2006

|

tom 08

13

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Lactation extension with regard to milk, fat and protein yield in Polish Holstein-Friesian cows of Black-and-White variety

84%

Janus E., Borkowska D.

Acta Scientiarum Polonorum. Zootechnica

|

2011

|

tom 10

|

nr 1

In the paper the influence of daily milk yield in peak lactation, milk yield during 305 days after calving and number of cows’ calving on frequency of lactations longer than 305-day standard were analyzed. It was also estimated the influence of extended lactation on milk yield and milk composition. The research were carried out in a herd including 220 Polish Holstein-Friesian cows of Black-And-White variety. The animals were housed in a loose barn and were fed a balanced TMR. The research included 384 lactations, which were longer at least 1 day than 305-day standard, and were selected out from 488 complete lactations. It was found that frequency of extended lactations was 78.7%, and moreover the most frequently (25.0%) the period of extension lasted up to 30 days. During extension period milk production was higher by 2.5–43.0% in compare to milk yield in standard lactation. Lactation extending was slightly connected with milk yield per 1 day of complete lactation. Values of this trait were highest in the case of lactation extended maximally by 60 days.

14

Efekty doskonalenia bydla rasy czarno-bialej odmiana holsztynsko-fryzyjska w swietle osiagniec nauki i praktyki rolniczej

84%

Klupczynski J.

Biuletyn Informacyjny. Akademia Rolniczo-Techniczna w Olsztynie

|

1993

|

nr 37

19-30

15

The evaluation on heterosis effects on physiological blood indicators in dairy cattle ontogenesis

84%

Skrzypek R.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2003

|

tom 05

16

The effects of genotype and selected environmental factors on colostrum production and intake in cattle

84%

Antkowiak I., Pytlewski J., Jakubowski M., Skrzypek R.

Polish Journal of Veterinary Sciences

|

2010

|

tom 13

|

nr 1

137-141

The aim of this study was to determine effects of genotype and selected environmental factors on colostrum production, intake, and efficiency in the cattle. The investigations were conducted on 67 dam-calf pairs. All cows were of Polish Holstein-Friesian breed, the Black-and-White variety (PHF-HO), whereas calves were sired by bulls of the following breeds: PHF-HO, Polish Holstein-Friesian of the Red-and-White variety (PHF-RW), Jersey (JE), Montbéliarde (MB) and Limousine (LI). The colostrum was collected from cows and offered to calves "from bucket" thrice a day. The amount of produced colostrum considerably exceeded the ability of its consumption by calves. Low share of HF genes in the cow, older cow's age and calving in the period from January to April appeared to be favorable factors for colostrum production. Calves born to cows with low HF gene share drank more colostrum than calves originating from cows with higher gene share of this breed. Crosses with JE drank the highest amount of the colostrum in relation to body weight, while MB-sired calves drank the highest amount in absolute terms. Colostrum intake was positively correlated with the dam's age. Furthermore, it was shown that in case of the first colostrum intake the most favorable period was from May to September, while in cases of total intake in the first day of life and mean intake in the first 5 days of life it was the period from January to April. Crosses with JE were characterized by extremely high use of colostrum per unit of body weight gain.

17

Detection of heifers with dystocia using artificial neural networks with regard to ERalpha-BGLI, ERalpha-SNABI and CYP19-PVUII genotypes

84%

Zaborski D., Grzesiak W.

Acta Scientiarum Polonorum. Zootechnica

|

2011

|

tom 10

|

nr 2

The aim of this study was to detect heifers with dystocia using artificial neural networks (ANN). A total of 531 calving records of Holstein-Friesian heifers of Black-and-White strain and 8 diagnostic variables were used. The output variable was the class of calving difficulty: difficult or easy. Perceptrons with one (MLP1) and two (MLP2) hidden layers and radial basis function (RBF) networks were investigated. The root mean square error and the structure of selected ANN (number of neurons in the input, hidden and output layers) were 0.22, 10-4-1; 0.25, 10-17-17-1 and 0.19, 10-25-1 for MLP1, MLP2 and RBF, respectively. The percentage of correctly recognized heifers with difficult and easy calvings and that of correctly diagnosed heifers from both categories for the training and validation sets were approx. 90%. The same values for the test set were 75-83%, 82–88% and 82–86%, respectively. In both cases, no significant differences in these proportions were found. The following variables contributed most to the detection of heifers with dystocia: gestation length, BCS index, CYP19-PvuII and ERα-BglI genotypes and percentage of HF genes in heifer’s genotype.

18

Heterosis estimates for growth traits in dairy heifers

84%

Szelag-Gruszka I., Skrzypek R.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2003

|

tom 05

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

84%

Pytlewski J., Antkowiak I., Dorynek Z.

Animal Science. Scientific Papers of Agricultural University of Poznan

|

2006

|

tom 08

20

Somatic cell level in dairy cows’ milk during extended lactation

84%

Salamonczyk E., Gulinski P.

Annals of Animal Science

|

2013

|

tom 13

|

nr 4

Ograniczanie wyników