Zobrazeno 1 - 10
of 10
pro vyhledávání: '"John P. Gibson"'
Publikováno v:
Scopus-Elsevier
A herd of purebred Hampshire and a herd of purebred Duroc pigs were created between 1987 and 1989 and subsequently selected on an index of growth rate and backfat from 1989 to 1995. Strict rules were put in place to promote rapid turnover of generati
Publikováno v:
Genome. 44:7-12
The interaction of gonadotropin-releasing hormone (GNRH) and its receptor (GNRHR) is critical in the endocrine regulation of reproduction. The gene (GNRHR) encoding the receptor has been mapped to porcine chromosome 8. There is evidence for three qua
Publikováno v:
Genome. 44:7-12
The interaction of gonadotropin-releasing hormone (GNRH) and its receptor (GNRHR) is critical in the endocrine regulation of reproduction. The gene (GNRHR) encoding the receptor has been mapped to porcine chromosome 8. There is evidence for three qua
Autor:
K. R. Koots, John P. Gibson
Publikováno v:
Canadian Journal of Animal Science. 78:29-45
A bioeconomic model of an integrated Canadian beef production system was developed to derive economic values for genetic improvement of multiple traits. The breeding objective was assumed to be profit maximization of the integrated enterprise. Sixtee
Autor:
K. R. Koots, John P. Gibson
Publikováno v:
Canadian Journal of Animal Science. 78:47-55
The effect of altering production and marketing circumstances on economic values is quantified for a complete beef production system. Absolute and relative economic values were found to vary substantially with large, but realistic fluctuations in pri
Autor:
Luis Gomez-Raya, John P. Gibson
Publikováno v:
Genome. 36:433-439
Identification of allelic variants with economic importance is feasible via molecular genetic techniques. This information can be used to increase the frequency of favourable alleles in dairy cattle. The effect of selection on the genotype within fam
Publikováno v:
Canadian Journal of Animal Science. 72:477-491
It would be of benefit to the dairy industry to have sires evaluated for the net economic value of their genetic potential for milk-production traits. Economic weights and selection indexes were derived for a variety of production circumstances, taki
Publikováno v:
Canadian Journal of Animal Science. 72:409-412
Two thousand three hundred and five bulls with complete pedigree information and proofs (ETA) in at least 1 of 10 yr for milk, fat and fat percent were used to study the reliability of genetic evaluations. No evidence was found that bulls with superi
Publikováno v:
Canadian Journal of Animal Science. 71:293-300
Sixty-five first lactation Holstein heifers, 31 sired by one of 19 top Canadian AI proven sires and 34 sired by one of 19 top New Zealand AI proven sires were compared for production, feed intake, energetic efficiency, body weight and condition. Heif
Publikováno v:
Canadian Journal of Animal Science. 71:21-27
Milk production data collected from 1980 to 1986 for Holsteins in Canada were examined for evidence of preferential treatment of cows. Herds were split by milk-recording organization and within organization into Embryo Transfer herds, Bulldam herds,