Zobrazeno 1 - 10
of 82
pro vyhledávání: '"G.L. Roy"'
Publikováno v:
Livestock Production Science. 44:27-36
Fifty-seven black and white male dairy calves, reared from 48 to 222 kg liveweight, were used to study the effects of photoperiod and feeding whole maize (75%; WM), whole barley (80%; WB) or rolled barley (80%; RB) based diet after weaning. Photoperi
Autor:
D. Perotto, J. R. Batra, R. I. Cue, A.J. McAllister, J.M. Wauthy, C.Y. Lin, A.J. Lee, G.L. Roy
Publikováno v:
Canadian Journal of Animal Science. 74:401-409
Crossbreeding parameters (line additive, dominance and additive × additive epistatic effects for individual and for maternal performance) on growth traits of females from a crossbreeding experiment between Holstein-based (HS) and Ayrshire-based (AS)
Autor:
C.Y. Lin, K.A. Winter, T.R. Batra, A.J. McAllister, J.M. Wauthy, A.J. Lee, G.L. Roy, J.A. Vesely
Publikováno v:
Journal of Dairy Science. 77:2400-2414
Additive and nonadditive genetic effects on lifetime yields of milk and milk components and lifetime profitability were estimated from 5070 cattle in a Holstein pureline, an Ayrshire-based pureline, and 10 crossbred groups of these purelines. Lifetim
Publikováno v:
Canadian Journal of Animal Science. 74:29-36
The objective of this study was to compare the efficiency of cloprostenol and fenprostalene in synchronizing estrus. Before treatment, estrus was detected during 4.5 d for multiparous cows in exp. 1 (n = 105) and 7.5 d for primiparous and nulliparous
Autor:
J.A. Vesely, S. Wang, K.A. Winter, A.J. McAllister, G.L. Roy, J.M. Wauthy, C.Y. Lin, A.J. Lee, T.R. Batra
Publikováno v:
Canadian Journal of Animal Science. 72:227-236
Early first lactation data from 2230 cows of five research herds of Agriculture Canada were used to study the interactions of genetic line by concentrate level, and sire by concentrate level and to estimate breeding values of sires. The genetic lines
Autor:
A.J. Lee, S. Wang, J.A. Vesely, A.J. McAllister, K.A. Winter, J.M. Wauthy, C.Y. Lin, G.L. Roy, T.R. Batra
Publikováno v:
Journal of Dairy Science. 75:1273-1280
Early part records for milk yield and feed consumption of 2230 first lactation purebred and crossbred dairy cows were analyzed to evaluate various measures of feed efficiency. Corrected milk yield was estimated by adjusting the second 8 wk of milk yi
Publikováno v:
Theriogenology. 43(5)
The objective of this study was to compare the estrus synchronization efficiency of PGF2alpha in cattle (n = 470) not having shown estrus for 4 (D4 treatment) or 7 d (D7 treatment) after onset of the breeding season. The physiological status of cross
Publikováno v:
Journal of dairy science. 77(1)
The effects of dietary hay or silage on plasma alpha-tocopherol and Se concentrations during late gestation and early lactation were studied using 40 crossbred pregnant cows and their calves. Cows received solely either timothy hay or grass silage fo
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Autor:
J.A. Vesely, D.A. Boichard, K. Nadarajah, A.J. McAllister, A.J. Lee, G.L. Roy, C.Y. Lin, T.R. Batra
Publikováno v:
Journal of Dairy Science
Journal of Dairy Science, American Dairy Science Association, 1992, 75, pp.3145-3154
Journal of Dairy Science, American Dairy Science Association, 1992, 75, pp.3145-3154
Heritabilities, genetic and phenotypic correlations among growth, forage consumption, and BW changes of heifers and feed consumption, BW changes, and yields of first lactation cows were estimated. Data were from 1266 Holstein progeny of 74 sires born