Zobrazeno 1 - 10
of 40
pro vyhledávání: '"R.D. Plowman"'
Publikováno v:
Journal of Dairy Science. 73:3330-3335
Adjustment factors for age and month of calving were developed from Holstein lactation records in Ecuador. Age factors were similar to those in the United States, but calendar month effects were small, apparently because of uniform feeding and manage
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef8b5a56674d2ca48dfb121284b038d6
https://doi.org/10.3168/jds.s0022-0302(90)79027-3
https://doi.org/10.3168/jds.s0022-0302(90)79027-3
Publikováno v:
Journal of Dairy Science. 60:1773-1786
Outcrossing, mild inbreeding, and crossbreeding in a common foundation of Holstein cows were compared in the Beltsville herd from 1957 through 1970. The outcross and mildly inbred systems consisted of four generations, and the crossbred system consis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1cf6029c5d62779b3617e76960b57396
https://doi.org/10.3168/jds.s0022-0302(77)84101-5
https://doi.org/10.3168/jds.s0022-0302(77)84101-5
Publikováno v:
Journal of Dairy Science. 60:1787-1798
Body dimensions and weights of female progeny from three systems of mating were studied from birth to first calving. Heifers produced by outcrossing to Holstein sires in artificial insemination were largest up to first calving, at which time the aver
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5e364f7bfcfb09669ca4aa4a1b1f34da
https://doi.org/10.3168/jds.s0022-0302(77)84102-7
https://doi.org/10.3168/jds.s0022-0302(77)84102-7
Autor:
J.W. Smith, R.D. Plowman
Publikováno v:
Journal of Dairy Science. 51:162-168
(1) Alexander, M. HI, and Yapp, W. W. 1949. Comparison of Methods of Estimating Milk and Fat Production in Dairy Cows. 5. Dairy Sei., 32 : 621. (2) Bayley, N. D., Liss, R. M., and Stallard, J . E . 1952. A Comparison of Bimonthly and Quarterly Testin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97112b2fd15cac2d38aa579a3650a9b8
https://doi.org/10.3168/jds.s0022-0302(68)86941-3
https://doi.org/10.3168/jds.s0022-0302(68)86941-3
Publikováno v:
Journal of Dairy Science. 51:1409-1419
Milk production, feed consumption and body weight data were collected on 661 lactations of 318 Holstein cows by 17 sires to study the genetic aspects of gross feed efficiency of milk production. Gross feed efficiency was defined as the ratio kilogram
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b3e05c36168f35f14122bde4aac0e6c
https://doi.org/10.3168/jds.s0022-0302(68)87204-2
https://doi.org/10.3168/jds.s0022-0302(68)87204-2
Publikováno v:
Journal of Dairy Science. 54:1518-1525
Lactation records of 228 first lactation Jerseys were utilized to assess the importance of sire×ration interactions. Daughters of 13 sires were divided randomly into two groups at calving and assigned to either an all forage ration or a forage plus
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6d893a8355ee82393e77deb0b600cd8
https://doi.org/10.3168/jds.s0022-0302(71)86057-5
https://doi.org/10.3168/jds.s0022-0302(71)86057-5
Publikováno v:
Journal of Dairy Science. 44:699-707
Summary Environmental studies for 230 cows over 462 lactations were made for 7 yr. Statistical estimates of general environmental changes and the specific changes resulting from the influences of feeding and management factors were computed and compa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b56c5733a4489944f17fb525f4206f7
https://doi.org/10.3168/jds.s0022-0302(61)89803-2
https://doi.org/10.3168/jds.s0022-0302(61)89803-2
Publikováno v:
Journal of Dairy Science. 51:378-384
The Dairy Herd Improvement Association (DHIA) age factors of Kendrick and McDaniel were compared using 10,620 first lactations made in Michigan Holstein herds during the period 1961–63. The effectiveness of the alternative age adjustments was judge
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::88ac4ed4d0a4e45ce475b0ba97292ffb
https://doi.org/10.3168/jds.s0022-0302(68)86994-2
https://doi.org/10.3168/jds.s0022-0302(68)86994-2
Publikováno v:
Journal of Dairy Science. 42:202-206
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5470c56d9add9772ddcc7ce09f21992a
https://doi.org/10.3168/jds.s0022-0302(59)90550-8
https://doi.org/10.3168/jds.s0022-0302(59)90550-8
Publikováno v:
Journal of Dairy Science. 51:782-791
Three methods of sire evaluation were compared empirically—herdmate comparison, least squares, and maximum likelihood. Michigan Dairy Herd Improvement Association Holstein data representing 10,620 first lactation records and 1,003 herd-year groups
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fcf489a10c2f2897e9d8b3845f8e1a62
https://doi.org/10.3168/jds.s0022-0302(68)87071-7
https://doi.org/10.3168/jds.s0022-0302(68)87071-7