Zobrazeno 1 - 10
of 49
pro vyhledávání: '"J. Bohmanova"'
Publikováno v:
Czech Journal of Animal Science, Vol 52, Iss 10, Pp 315-324 (2007)
6 508 bulls of dual-purpose cattle at performance-test stations were weighed at intervals of 30 days from birth to 420 days. After all editing a total of 74 558 weight records were available. Live weight was evaluated by orthogonal Legendre Polynomia
Externí odkaz:
https://doaj.org/article/517033c6e9d449e98319fd8cc3bba725
Publikováno v:
Animal, Vol 4, Iss 2, Pp 173-182 (2010)
The objective of this study was to investigate genetic merit of return over feed (ROF), which is a herd profit index defined by CanWest Dairy Herd Improvement as a difference between milk income and feed cost. A multiple-trait (MT) model and random r
Externí odkaz:
https://doaj.org/article/587d162fedda4830ad4b59040a593505
Publikováno v:
Journal of Dairy Science. 93:1216-1233
Multiple-trait random regression animal models with simultaneous and recursive links between phenotypes for milk yield and somatic cell score (SCS) on the same test day were fitted to Canadian Holstein data. All models included fixed herd test-day ef
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b24faa40c7133ffebf8be1183ed671b1
https://doi.org/10.3168/jds.2009-2585
https://doi.org/10.3168/jds.2009-2585
Publikováno v:
Animal, Vol 4, Iss 2, Pp 173-182 (2010)
The objective of this study was to investigate genetic merit of return over feed (ROF), which is a herd profit index defined by CanWest Dairy Herd Improvement as a difference between milk income and feed cost. A multiple-trait (MT) model and random r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cf85cd6520f05b97f6db73ae3bb09f7
http://www.sciencedirect.com/science/article/pii/S175173110999108X
http://www.sciencedirect.com/science/article/pii/S175173110999108X
Publikováno v:
Journal of Dairy Science. 92:5314-5325
The Canadian Test-Day Model includes test-day (TD) records from 5 to 305 d in milk (DIM). Because 60% of Canadian Holstein cows have at least one lactation longer than 305 d, a significant number of TD records beyond 305 DIM could be included in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::179172b520de350628f0d3eedd3d358b
https://doi.org/10.3168/jds.2009-2280
https://doi.org/10.3168/jds.2009-2280
Publikováno v:
Journal of Dairy Science. 92:3422-3430
Twice-a-day milking is currently the most frequently used milking schedule in Canadian dairy cattle. However, with an automated milking system (AMS), dairy cows can be milked more frequently. The objective of this study was to estimate genetic parame
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::32cc764f69a5f1d0d1f8b561845f9cb1
https://doi.org/10.3168/jds.2008-1689
https://doi.org/10.3168/jds.2008-1689
Publikováno v:
Journal of Dairy Science. 92:1300-1312
Pregnancy has a negative impact on milk production in dairy cattle. Estimates of the effects of pregnancy are required in genetic evaluation models. Test-day records of Ayrshire, Jersey, Brown Swiss, and Guernsey breeds were analyzed phenotypically f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2dd5ad4d4973ec2b4a230b6bc8cbc47d
https://doi.org/10.3168/jds.2008-1425
https://doi.org/10.3168/jds.2008-1425
Publikováno v:
Journal of Dairy Science. 91:3627-3638
A random regression model with both random and fixed regressions fitted by Legendre polynomials of order 4 was compared with 3 alternative models fitting linear splines with 4, 5, or 6 knots. The effects common for all models were a herd-test-date ef
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3ffd4af8b7da392dcabced653f1a9ade
https://doi.org/10.3168/jds.2007-0945
https://doi.org/10.3168/jds.2007-0945
Publikováno v:
Journal of Dairy Science. 91:840-846
Heat stress was evaluated as a factor in differences between regional evaluations for milk yield in the United States. The national data set (NA) consisted of 56 million first-parity, test-day milk yields on 6 million Holsteins. The Northeastern subs
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::39f6d44c8c85a05fa85f3a6e62af7459
https://doi.org/10.3168/jds.2006-142
https://doi.org/10.3168/jds.2006-142
Publikováno v:
Czech Journal of Animal Science. 52:315-324
tant traits. The main selection criteria for meat performance of young bulls entering insemination are their own live weight and average daily gain in the period of growth performance test (110 to 365 days of age) at performance-test stations with st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::362b64ba9ff5eacf4ec43f6230d3c777
https://doi.org/10.17221/2340-cjas
https://doi.org/10.17221/2340-cjas