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

100%

Zaborski D., Grzesiak W.

Acta Scientiarum Polonorum. Zootechnica

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2011

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tom 10

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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.

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Heterosis estimates for growth traits in dairy heifers

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Szelag-Gruszka I., Skrzypek R.

Animal Science. Scientific Papers of Agricultural University of Poznan

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2003

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tom 05

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Serum immunoglobulins concentration in pregnant dairy heifers and their performance

100%

Skrzypek R.

Roczniki Akademii Rolniczej w Poznaniu. Zootechnika

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2001

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tom 53

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Interrelationships between glutamic oxoloacetic transaminase and glutamic pyruvic transaminase activities and growth rate of juvenile dairy heifers

100%

Skrzypek R.

Roczniki Akademii Rolniczej w Poznaniu. Zootechnika

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2001

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tom 53

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Intake, rumen function and NDF kinetics in mature dairy heifers in Tanzania maintained on poor quality hay as affected by sugar, starch, nitrogen or mineral supplementation

80%

Mlay P. S., Pereka A. E., Weisbjerg M. R., Hvelplund T., Madsen J.

Journal of Animal and Feed Sciences

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2003

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tom 12

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nr 2

Ograniczanie wyników

2 Roczniki Akademii Rolniczej w Poznaniu. Zootechnika

1 Acta Scientiarum Polonorum. Zootechnica

1 Animal Science. Scientific Papers of Agricultural University of Poznan

1 Journal of Animal and Feed Sciences

3 Skrzypek R.

1 Grzesiak W.

1 Hvelplund T.

1 Madsen J.

1 Mlay P. S.

1 Pereka A. E.

1 Szelag-Gruszka I.

1 Weisbjerg M. R.

1 Zaborski D.

1 2011

2 2003

2 2001

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

Heterosis estimates for growth traits in dairy heifers

Serum immunoglobulins concentration in pregnant dairy heifers and their performance

Interrelationships between glutamic oxoloacetic transaminase and glutamic pyruvic transaminase activities and growth rate of juvenile dairy heifers

Intake, rumen function and NDF kinetics in mature dairy heifers in Tanzania maintained on poor quality hay as affected by sugar, starch, nitrogen or mineral supplementation