›› 2012, Vol. 39 ›› Issue (11): 73-78.

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Effects of Vitamin A on Beef Quality of Angus ? Qinchuan Crossbred Steers

LI Jun-tao1,2, ZHOU Ling-yun2, WANG Lin-feng1, ZHAO Hai-yan2, WANG Dian2, SUN Peng2   

  1. 1. College of Animal Husbandry Medical Engineering, Henan Agricultural University, Zhengzhou 450002, China;
    2. State Key Laboratory of Animal Nutrition, Institute of Animal Sciences, Chinese Academy of Agricultural Sciences, Beijing 100193, China
  • Received:2012-03-27 Online:2012-11-20 Published:2012-11-22

Abstract: A slaughter trial was conducted to evaluate the effects of dietary vitamin A supplementing dose on meat quality by using 16 Angus ? Qinchuan crosses steers at 24-month age in a complete randomized design after 4 months of finishing period with diets contained 0,1100,2200 and 4400 IU/kg DM. The results showed that VA dose did not affect subcutaneous fat thickness,mesenteric fat weight/living weight,longissimus area,dressing percentage,pure meat percentage and marbling score(P>0.05) which was better with the decrease of VA dose. But VA dose significantly affected final weight,daily gain,back fat thickness and shear force(P<0.05), back fat thickness and shear force were lowest at 1100 IU/kg DM, and average daily gain which had a tendency was numerically greater with VA dose increment when dietary VA dose was less than 2200 IU/kg DM.VA dose had no significant effect on the chemical composition of LD and GM except for matter and crude ash of GM,matter and crude protein of LD(P>0.05).VA dose had significant effect on drip loss, total pigment concentration and TBARS during aging(P<0.05), and different beef cuts responses to VA dose were not identical. Considering these results, the effect was the best when the Angus譗inchuan steers were fed with the diet contained VA 1100 IU/kg DM.

Key words: crossbred steer; vitamin A; beef quality; marbling score

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