Abstract
ABSTRACT Angus (n = 10) and American Wagyu crossbred (n = 10) steers were fed for 552 days to gain 0.9 kg/day. Samples of liver, longissimus muscle, sternomandibularis muscle, mesenteric, kidney, and subcutaneous (s.c.), intermuscular, and intramuscular (i.m.) adipose tissues were obtained immediately post exsanguination to determine glucose‐6‐phosphate dehydroge‐nase (G‐6‐PDH) and 6‐phosphogluconate dehydrogenase (6‐PGDH) activities. Subcutaneous adipose tissue had the highest (P < 0.05) activities for both G‐6‐PDH and 6‐PGDH. Fat depots exhibited higher activity rates than muscle samples for both G‐6‐PDH and 6‐PGDH. No differences (P > 0.05) were found between cattle types for these enzymatic activities. However, there was a trend for Wagyu to have higher lipogenic activity for fat depots than Angus steers. Narrow sense heritability estimates were ‐0.02 and 0.13 for G‐6‐PDH and 6‐PGDH, respectively. This indicates that there was no additive genetic variation, and that most of the phenotypic variation in these enzymes is due to environmental variation.
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