Plasma hormone and metabolite concentrations involved in the somatotropic axis of Japanese Black heifers in association with growth hormone gene polymorphism.
Bovine growth hormone (bGH) gene polymorphism of leucine (Leu)-threonine (Thr) (allele A), valine (Val)-Thr (allele B), and Val-methionine (Met) (allele C) at codons 127 and 172 was shown to relate with carcass trait variations in Japanese Black cattle. In this study, 10-mo-old Japanese Black heifers with growth hormone (GH) genotypes AA, AB, BB, AC, BC, and CC (N=141) were compared for basal GH, insulin-like growth factor-1 (IGF-1), insulin, ghrelin, glucose, and nonesterified fatty acid (NEFA) concentrations. Growth hormone release was also measured as response to growth hormone-releasing hormone (GHRH) (0.4 microg/kg body weight [BW]) using 18 heifers with GH genotypes AA, BB, and CC (n=6 for each group). The genotype AA heifers showed the greatest BW among genotypes (P<0.05). Genotype AC, BC, and CC heifers showed greater GH concentrations than genotype AA, AB, or BB heifers, in which genotype CC heifers had the highest concentrations (P<0.05). However, IGF-1 concentrations did not significantly differ. The genotype AA and BB heifers had a greater GH release at 60 min following GHRH injection than did the genotype CC heifers. The area under the curve (AUC; P<0.07) and incremental area (IA; P<0.08) of GH responses to the GHRH challenge tended to be the highest in the genotype AA heifers and the lowest in the genotype CC heifers. In conclusion, GH gene polymorphism altered GH, which may have contributed to differences in BW and carcass traits among genotypes.
Ardiyanti
A
A
Department of Animal Physiology, Graduate School of Agricultural Science, Tohoku University, Tsutsumidori, Aoba, Sendai, Japan. astrid@bios.tohoku.ac.jp
Abe
F
F
Kobashikawa
H
H
Hirayama
T
T
Sugino
T
T
Suzuki
K
K
Katoh
K
K
D000818:Animals; D001786:Blood Glucose / Q000378:metabolism; D001823:Body Composition / Q000235:genetics* / Q000502:physiology; D002417:Cattle / Q000235:genetics* / Q000378:metabolism; D004734:Energy Metabolism / Q000235:genetics*; D005230:Fatty Acids, Nonesterified / Q000378:metabolism; D005260:Female; D005838:Genotype; D054439:Ghrelin / Q000378:metabolism; D013006:Growth Hormone / Q000235:genetics* / Q000378:metabolism; D013007:Growth Hormone-Releasing Hormone / Q000502:physiology; D007328:Insulin / Q000378:metabolism*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism; D020641:Polymorphism, Single Nucleotide; D013045:Species Specificity
D001786:Blood Glucose; D005230:Fatty Acids, Nonesterified; D054439:Ghrelin; D007328:Insulin; D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone; D013007:Growth Hormone-Releasing Hormone