Výsledky vyhledávání - "J.F. Burchard"

Akademický článek

Multiple-trait random regression modeling of feed efficiency in US Holsteins

Autor: P. Khanal, K.L. Parker Gaddis, M.J. Vandehaar, K.A. Weigel, H.M. White, F. Peñagaricano, J.E. Koltes, J.E.P. Santos, R.L. Baldwin, J.F. Burchard, J.W. Dürr, R.J. Tempelman

Publikováno v: Journal of Dairy Science, Vol 105, Iss 7, Pp 5954-5971 (2022)

ABSTRACT: Residual feed intake (RFI) and feed saved (FS) are important feed efficiency traits that have been increasingly considered in genetic improvement programs. Future sustainability of these genetic evaluations will depend upon greater flexibil

Externí odkaz: https://doaj.org/article/4474809b91e24f749112ed10a83d89c8

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Multiple-trait random regression modeling of feed efficiency in US Holsteins

Autor: P. Khanal, K.L. Parker Gaddis, M.J. Vandehaar, K.A. Weigel, H.M. White, F. Peñagaricano, J.E. Koltes, J.E.P. Santos, R.L. Baldwin, J.F. Burchard, J.W. Dürr, R.J. Tempelman

Publikováno v: Journal of dairy science. 105(7)

Residual feed intake (RFI) and feed saved (FS) are important feed efficiency traits that have been increasingly considered in genetic improvement programs. Future sustainability of these genetic evaluations will depend upon greater flexibility to acc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9932fdd263b22028e903aa6c42271e8
https://pubmed.ncbi.nlm.nih.gov/35636997

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Exposure of pregnant dairy heifer to magnetic fields at 60 Hz and 30 µT

Autor: D.H. Nguyen, J.F. Burchard, H.G. Monardes

Publikováno v: Bioelectromagnetics. 28:471-476

Thirty-two pregnant Holstein heifers weighing 499 ± 45 kg, at 3.1 ± .7 months of gestation and 21 ± 2.0 months of age were confined and exposed to 30 µT magnetic fields (MFs) and a 12 h light/12 h dark light cycle. The heifers were divided into t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::24797551f3a81563479f819f7c5f8695
https://doi.org/10.1002/bem.20325

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Plasma concentrations of thyroxine in dairy cows exposed to 60 Hz electric and magnetic fields

Autor: Duc Hai Nguyen, Maria Rodriguez, J.F. Burchard

Publikováno v: Bioelectromagnetics. 27:553-559

Two experiments were carried out to assess the effects of electric and magnetic fields (EMF) on blood thyroxine (T4) in dairy cattle. In experiment 1, 16 lactating pregnant Holstein cows were exposed to 10 kV/m, 30 microTesla (microT) EMF. The animal

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::27c631e6b04c5fb65f23719457eea06a
https://doi.org/10.1002/bem.20253

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Lack of effect of 10 kV/m 60 Hz electric field exposure on pregnant dairy heifer hormones

Autor: D. Petitclerc, J.F. Burchard, H.G. Monardes, D.H. Nguyen

Publikováno v: Bioelectromagnetics. 25:308-312

Sixteen pregnant Holstein heifers weighing 521 ± 46 kg, at 3.3 ± 0.7 months of gestation and 2.2 ± 2.0 months of age were confined to wooden metabolism cages and were exposed to a vertical electric field (EF) of 10.0 ± 0.4 kV/m and an artificial

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::da14cd13739645bbcc480a46b84e66c7
https://doi.org/10.1002/bem.20020

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Effect of 10 kV, 30 ?T, 60 Hz electric and magnetic fields on milk production and feed intake in nonpregnant dairy cattle

Autor: J.F. Burchard, H.G. Monardes, D.H. Nguyen

Publikováno v: Bioelectromagnetics. 24:557-563

Milk production is the main agricultural income in the province of Québec, and the electrical distribution network traverses the rural dairy production region. This study evaluates the hypothesis that electric and magnetic fields may affect dairy pr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a19018a04ee1143f3838313408e94f3f
https://doi.org/10.1002/bem.10132

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Responses of the estrous cycle in dairy cows exposed to electric and magnetic fields (60 Hz) during 8-h photoperiods

Autor: Maria Rodriguez, Elliot Block, D.H. Nguyen, J.F. Burchard, B.R. Downey, Denis Petitclerc

Publikováno v: Animal Reproduction Science. 77:11-20

To study the effects of exposure to extremely low frequency (ELF) electric and magnetic fields (EMF) on the estrous cycle of dairy cows under short-day photoperiod, 16 non-lactating, non-pregnant Holstein cows were exposed to a vertical electric fiel

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cedf3bf5c342978f4da5ba678b2e876
https://doi.org/10.1016/s0378-4320(02)00273-7

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Macro- and trace element concentrations in blood plasma and cerebrospinal fluid of dairy cows exposed to electric and magnetic fields

Autor: E. Block, D.H. Nguyen, J.F. Burchard

Publikováno v: Bioelectromagnetics. 20:358-364

Eight multiparous, nonlactating pregnant Holstein cows (at 198 +/- 35 days of gestation and weighing 608 + 24 kg) and seven nonlactating nonpregnant ovariectomized heifers (weighing 370 + 29 kg) were confined to wooden metabolism crates in an electri

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5a935d87091a862d8af859f76349bc62
https://doi.org/10.1002/(sici)1521-186x(199909)20:6<358::aid-bem4>3.0.co

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