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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.20.0234    [Accepted] Published online July 2, 2020.
Effects of a pineapple (Ananas comosus L.) cannery by-product on growth performance and carcass characteristics in the finishing stage of Hanwoo steer
Yongjun Choi1  , Sangrak Lee1  , Youngjun Na1,* 
Department of Animal Science and Technology, Konkuk University, Seoul 05029, Korea
Correspondence:  Youngjun Na, Tel: +82-2-450-3696, Fax: +82-2-455-1044, Email: ruminoreticulum@gmail.com
Received: 14 April 2020   • Revised: 13 May 2020   • Accepted: 26 June 2020
The aim of this study was to determine the effect of pineapple cannery by-product (PCB) level on the growth performance and carcass characteristics of finishing Hanwoo steers.
The feeding stage was divided into early and late finishing stages. A total of 60 castrated Hanwoo steers (13.9±0.8 months old, 418.8±36.5 kg initial body weight [BW]) were blocked by initial BW and then randomly allotted into 12 pens (five head/pen). The pens were randomly assigned to control (CONT), low PCB (LPCB), or high PCB (HPCB) treatments. These diets contained 0%, 1.5%, or 3.0% of PCB (on a dry matter [DM] basis; as-fed basis was 0%, 10.6%, or 21.2%), respectively.
For the early finishing stage, body weight gain (BWG) and average daily gain (ADG) of the CONT and LPCB feeding groups were greater (p<0.05) than those of the HPCB feeding group. In addition, there were linear and quadratic effects on BWG and ADG with increasing dietary PCB level (p<0.05). The gain to feed (G:F) ratio tends to quadratically decrease as increasing PCB level in the early finishing stage (p=0.076). Growth performances of late finishing stage were not affected by PCB level. The marbling score of the LPCB feeding group was similar to that of the CONT feeding group. However, there was a linear decrease (p<0.05) in marbling score and quality grade among treatments as PCB was increased in the diet. In the longissimus muscle free amino acid profile, histidine composition increased linearly (p<0.05) with an increasing level of PCB.
The level of PCB 1.5% DM in diet can be used for finishing steers without any adverse effects on growth and carcass performances. However, there were some negative effects on growth and carcass performance in the HPCB feeding group.
Keywords: Beef Cattle; By-product; Carcass Trait; Pineapple; Steer

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