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http://dx.doi.org/10.5187/JAST.2004.46.6.989

Effects of Feeding Type of Concentrates During Growing Period and Slaughter Age on Growth Performance, Feed Efficiency and Carcass Characteristics in Growing-Fattening Holstein Steers  

Kang, S.W. (National Livestock Research Institute, RD.A.)
Jeong, H.Y. (National Livestock Research Institute, RD.A.)
Ahn, B.S. (National Livestock Research Institute, RD.A.)
Oh, Y.K. (National Livestock Research Institute, RD.A.)
Son, Y.S. (College of Life & Environmental Sciences, Korea University)
Publication Information
Journal of Animal Science and Technology / v.46, no.6, 2004 , pp. 989-998 More about this Journal
Abstract
The objectives of this work was to investigate the effects of feeding type of concentrates during growing period and slaughter age on growth performance, feed efficiency and carcass characteristics in growing-fattening Holstein steers. Treatments were two concentrates feeding types(ad libitum or restricted 1.9% of BW) and three slaughter ages(at 19, 22 or 25 mo). Body weight at slaughter was numerically higher(approx. 8.3%) for the restricted than the ad libitum feeding groups. TDN intake rate was higher(8.4%) for the restricted than the ad libitum feeding groups. One mo slaughter delay increased TDN intake by 4%. Despite the lack of significances, higher back fat thickness and rib-eye area appeared in the restricted feeding or the late slaughter groups compared with the ad libitum feeding or the early slaughter groups. Marbling score(mean 2.46) numerically increased when the steers were restrictively fed concentrates compared with the ad libitum feeding groups. In addition, significant increases in the marbling score were associated with the slaughter age delay. In economic analysis, increases in total income were associated with the restricted feeding and the slaughter age delay. Whereas the highest monthly income appeared in the restricted feeding-and-slaughter at 22 mo group. In conclusion, the optimal feeding system may be 1) the restricted concentrates feeding(1.9% of BW) during growing period and 2) the late slaughter age(22${\sim}$25 mo of age) in growing-fattening Holstein steers fed rice straw.
Keywords
Holstein steers; Concentrates feeding type; Slaughter age; Meat quantity; Meat quality;
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