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Table 2 Studies reporting vitamin A restriction and the ADH1C genotype in cattle

From: Vitamin A regulates intramuscular adipose tissue and muscle development: promoting high-quality beef production

Experimental details Treatments Effects on marbling or intramuscular fat (IMF) Reference
Angus-cross steers (n = 130; 50 TT, 50 TC, 30 CC) Backgrounded at 549 IU vitamin A/kg DM then fed 0 or 2200 supplemental IU vitamin A/kg DM Un-supplemented steers had greater marbling scores and IMF than supplemented steers. There was a significant treatment × genotype interaction for IMF. With no vitamin A supplementation, TT steers had 23% greater IMF than CC steers. Un-supplemented TT steers had 24% greater IMF than supplemented TT steers [106]
Angus-cross steers (n = 117; 45 TT, 45 TC, 27 CC) Backgrounded at 3360 IU vitamin A/kg DM, then fed 550, 1100, or 1650 total IU vitamin A/kg DM A treatment × genotype interaction was observed for IMF; TT steers on the 1650 IU/kg DM treatment had higher IMF relative to CT and CC steers on the same treatment [107]
Korean native steers (n = 136; 102 TT, 34 TC) Backgrounded at 890 IU vitamin A/kg DM, then fed 930 IU total vitamin A/kg DM Marbling scores were greater for the TC genotype than the TT genotype following a vitamin A-restricted diet [110]
Black Angus steers
(n = 2000; TT and TC), mixed breed
Backgrounded on 3360 IU vitamin A/kg DM, then fed 1100 or 2200 IU total vitamin A/kg DM There was not a significant vitamin A × ADH1C interaction for marbling score [111]