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Anim Sci J. 2016 Jul;87(7):929-37. doi: 10.1111/asj.12519. Epub 2015 Sep 30.

Influence of rice whole-crop silage diet on growth performance, carcass and meat characteristics and muscle-related gene expression in Japanese Black steers.

Author information

1
Livestock Production and Wildlife Management Research Division, NARO Western Region Agricultural Research Center, Oda.
2
Livestock and Forage Research Division, NARO Tohoku Agricultural Research Center, Morioka, Japan.

Abstract

The present study investigated the influence of a diet largely comprising rice whole-crop silage (rWCS) on growth performance, carcass and meat characteristics, and expression of genes involved in muscle growth of Japanese Black steers. Steers were randomly separated into rWCS-fed (rWCS ad libitum and restricted feeding of concentrate) and concentrate-fed groups. Total digestible nutrient intake and daily gain (DG) decreased in rWCS-fed steers in comparison with concentrate-fed steers, whereas dressed carcass weight and final body weight did not significantly differ between the groups. Decreases in drip loss in the muscle of rWCS-fed steers may be caused by α-tocopherol and β-carotene in muscle. Feeding large amounts of rWCS to steers may maintain quantitative productivity of beef steers equally to a concentrate-based diet, and improve the qualitative productivity. Results of gene expression suggest that activation of skeletal muscle growth in rWCS-fed steers may occur at the late fattening period owing to a decrease in myostatin and increase in myosin heavy chain gene expression. Preadipocyte factor-1 and myostatin genes may be strongly involved in the control of lipid accumulation. This rearing system would allow beef production to switch to rWCS-based diets from concentrate-based diets.

KEYWORDS:

beef steer; gene expression; meat quality; myostatin; rice whole-crop silage

PMID:
26420580
DOI:
10.1111/asj.12519
[Indexed for MEDLINE]

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