Zobrazeno 1 - 10
of 77
pro vyhledávání: '"F.R. Allaire"'
Autor:
C.H. Lobo, F.R. Allaire
Publikováno v:
Journal of Dairy Science. 78:2299-2307
Three alternative cost ratios and the ratio of annual fixed cost for cows to net replacement cost for three populations that differed in genetic (co)variances were investigated. We studied their effect on the value of longevity records to supplement
Autor:
B. Rekik, F.R. Allaire
Publikováno v:
Journal of Dairy Science. 76:2299-2307
Stochastic simulation was used to determine the potential of cow survival rate, or stayability, as a supplement to production for use in a genetic index when the sires of young AI bulls are selected to improve economic returns. Production alone, prod
Autor:
F.R. Allaire
Publikováno v:
Journal of Dairy Science. 76:2308-2319
Pair selection used for the assignment of mating pairs can be applied to dairy cattle. Intrabreed mating pair selection was reviewed for gain in additive genetic traits with nonlinear merit. Gain from pair selection was compared with that from mate s
Autor:
F.R. Allaire, John P. Gibson
Publikováno v:
Journal of Dairy Science. 75:1349-1356
Cow herd life adjusted for lactational milk production was investigated as a genetic trait in the breeding objective. Under a simple model, the relative economic weight of milk to adjusted herd life on a per genetic standard deviation basis was equal
Autor:
H. L. Barr, F.R. Allaire
Publikováno v:
Journal of Dairy Science. 73:1625-1630
Sire selection methods were compared by stochastic simulation for improvement in a three-trait, quadratic merit function. Selection indexes included milk, udder depth, and rear leg set phenotypes recorded on cows and bull progeny. The progeny index p
Autor:
F.R. Allaire, D.S. Keller
Publikováno v:
Journal of Dairy Science. 73:1631-1643
Economic weights for separate 1-kg increases in herd average genetic levels for fat, protein, carrier, and lactose yields were calculated for five daily breeds and three alternative milk markets. Economic weights were calculated using a dairy herd pr
Publikováno v:
Journal of Dairy Science. 64:249-258
We measured relationships of progesterone and total estrogens, or estrone and estradiol 17-β, in dairy heifers with their yield of milk in first lactation. Experiment 1 included 57 Holstein heifers where blood was sampled and body measurements were
Autor:
S.P. Smith, F.R. Allaire
Publikováno v:
Journal of Dairy Science. 68:939-945
Subjective linearized scores were recorded for milking speed, fore udder smoothness, shoulder looseness, and udder depth on 7357 and 3730 Holstein cows during first and second lactations. Random sire effects in threshold models were estimated for eac
Autor:
F.R. Allaire
Publikováno v:
Genetics Selection Evolution, Vol 10, Iss 4, Pp 596a-596 (1978)
Annales de Génétique et de Sélection Animale
Annales de Génétique et de Sélection Animale
The mating practice known as corrective mating is described in terms of a multi-trait selection method where at least one trait has a measurement scale nonlinear in its relationship with total merit. Nonrandom mating methods may be viewed as the sele
Publikováno v:
Journal of Dairy Science. 69:484-492
A forced choice technique was used to obtain decisions to describe perceived differences in total merit between pairs of cows. The study consisted of 9,240 decisions by 91 respondents from three groups of dairy breeders: private dairy producers, cons