PSIV-5 Effects of feeding fruit-vegetable byproducts on performance of growing Hanwoo steers

Abstract

Abstract This study was conducted to evaluate the effect of feeding fruit-vegetable byproducts on the growth of Hanwoo (Korean native beef cattle) steers. The treatments were Control (byproduct 0%), T1 (fruit-vegetable byproduct 20%), and T2 (cabbage peel 15% plus Chinese cabbage peel 15%, total byproduct 30%). The fruit-vegetable byproduct for T1 was produced from a hypermarket, containing various types of fruits and vegetables (orange, apple, tomatoes, onion, etc.). These byproducts were milled and treated with 6 g/kg of sodium metabisulfite for long term storage. The cabbage and Chinese cabbage byproduct for T2 produced from a traditional wholesale market was added as a raw material without pretreatment. Thirty-six steers (initial BW. 287 ± 89kg, 9.1 ± 2.7 months) were allocated into 12 pens (3 steers/pen) for 12 weeks according to BW and age. TMR diets were formulated by the Korean Feeding Standard for Hanwoo (2017) to supply the same nutrient contents (CP 16 % and TDN 73 %). The DMI was not different among treatments because the amount of feed was kept constant according to the BW of growing steers to prevent overweight during the growing period. For ADG, Control (1.03 kg/d) and T2 (0.82 kg/d) were lower (P < 0.05) than T1 (1.41 kg/d) in the 2nd period. On the other hand, ADG of T2 (1.72 kg/d) was higher (P < 0.05) than Control (0.82 kg/d) and T1 (1.16 kg/d) in the 3rd period. Overall, ADG for the whole experimental period was not different among treatments (1.20 kg/d for Control, 1.25 kg/d for T1, 1.16 kg/d for T2). FCR showed no significant difference during the whole period (18.36 for Control, 18.82 for T1, 19.75 for T2). Therefore, this study demonstrated that fruit-vegetable and cabbage byproducts in TMR diets for beef cattle can be replaced by 20 % and 30 %, respectively.