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PRINT: ISSN 2221-1896
ONLINE : ISSN 2223-0343
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Effects of a by-product feed-based silage diet on the performance,
blood metabolites, and carcass characteristics of Hanwoo heifers (a
field study)
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Young-Il
Kim1,
Jong-Moon
Park1,
Youn-Hee
Lee1,
Myeon
Lee1,
Young-kyoon Oh2,
Do-Young
Choi1,
and Wan-Sup
Kwak1* |
1Division
of Food Bioscience, College of Health and Medical Life Sciences, Konkuk
University, Danwol-dong 322, Chung-Ju, Chung-Buk 380-701, Korea;
2National
Institute of Animal Science, RDA, Suwon, 441-706, Korea
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Abstract |
This study was conducted to determine the effects of a by-product feed
(BF) based silage diet on the performance, blood metabolite parameters,
and carcass characteristics of Hanwoo heifers. The BF-based silage was
composed of 50% spent mushroom substrate, 21% recycled poultry bedding,
15% cut ryegrass straw, 10.8% rice bran, 2% molasses, 0.6% bentonite,
and 0.6% microbial additive (on a wet basis), and ensiled for over 5 d.
Twelve heifers were allocated to three diets during the growing and
fattening periods (6.2 and 8.8 months, respectively): a control diet
(concentrate mix and free access to rice straw), a 50% BF-based silage
diet (control diet + 50% of maximum BF-based silage intake), and a 100%
BF-based silage diet (concentrate mix and
ad libitum BF-based silage).
The BF-based silage was fed during the growing and fattening periods and
was replaced with rice straw during the finishing period. After 22.4
months, the resulting steers were slaughtered. Compared with the control
diet, the 100% BF-based silage diet significantly increased the average
daily gain and feed efficiency of the heifers by 27 and 18% respectively
(P<0.05), due to an increase in voluntary feed intake. Compared with the
control diet, the BF-based silage diet had little effect on levels of
serum constituents, electrolytes, or enzymes or on blood cell profiles
in growing heifers. The BF-based silage diet did not affect cold carcass
weight, yield traits such as back fat thickness, longissimus muscle
area, yield index, and yield grade, or quality traits such as meat
colour, fat colour, texture, maturity, marbling score, and quality
grade. In addition, good quality meat was more frequently obtained when
the heifers were fed the BF-based silage diet (75% for the control group
vs. 100% for the BF-based silage-fed groups). In conclusion, BF-based
silage can be used as a good quality roughage source for Hanwoo heifers.
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Keywords:
Spent mushroom substrates; by-product feed; silage; meat quality;
heifer; Hanwoo |
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To cite this article:
Kim YI, JM Park, YH Lee, M
Lee,
YK Oh,
DY Choi and WS
Kwak,
2014.
Effects of a by-product feed-based silage diet on the performance, blood
metabolites, and carcass characteristics of Hanwoo heifers (a field
study).
Res.
Opin. Anim. Vet. Sci., 4(12): 654-662. |
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