Effects of high energy diet on growth performance, carcass characteristics, and blood constituents of final fattening Hanwoo steers

Abstract

: The aim of this study was to examine the effects of high energy diet on growth 26mon, 28mon, and 30mon in Hanwoo at different ages. High energy diet required not only an amount of concentrate on days of fattening periods but also induced cost for the management. We hypothesized that high energy diet was able to reduce a fattening period to reach a certain quality grade. A 2 x 3 factorial arrangement (High energy, control vs 26, 28, 30month endpoints) in a completely random design was used to feed 48 Hanwoo steers. Four steers were fed in same pen and 12 pens were used for treatment. Blood was drawn from each steers on every other months during early, middle, and final fattening periods. Over all ADG and feed efficiency were not different between high energy and control diet (P > 0.05). Dry matter intake was induced 30 mo-old early and final fattening periods at high energy diet. Serum glucose concentration were increased (P < 0.05) at 30 and 26month old steers. Marbling scores were greater at 30 month old than 26 and 28 month old Hanwoo steers. Carcass weight of Hanwoo steers were greater at 30 mon-old groups than other groups. These result indicated that high energy diet (+3% TDN) and slaughter endpoint collectively contribute to the observed quality grade compositional differences among three final fattening periods of Hanwoo steers.

Current situation and future prospects for beef production in South Korea — A review

“…High TDN based diet increased marbling scores at 28- and 30-months of age. These data consistently show that Wagyu and Hanwoo BFT was relatively lower than those of Angus [ 15 , 23 ].…”

“…A study that compared carcass characteristics between energy diets and endpoints of Hanwoo steers [ 23 ] found that marbling score and carcass weight steadily increased to endpoints of 26, 28, and 30 months. High TDN based diet increased marbling scores at 28- and 30-months of age.…”

Effect of Total Digestible Nutrients Level of Concentrates on Growth Performance, Carcass Characteristics, and Meat Composition of Korean Hanwoo Steers

“…In addition, the late fattening period is the stage where the meat quality is completed; thus, setting the TDN level of concentrate during this period is more effective than setting it during the growing and early fattening periods (Kim, 2015). Increasing the TDN level in concentrate influences the increase in DM degradability and energy availability (Ki, 2009), increases the DMI (Chung et al, 2015), and improves ADG (Jin et al, 2012). However, in the present study, there was no improvement in ADG and FCR with increasing TDN levels in concentrate, and it was found to be most effective at the quantities in the T2.…”

“…The energy level of feed is known to be a major factor affecting the growth performance, carcass characteristics, and fat deposition in beef cattle (Chung et al, 2015), with total digestible nutrients (TDN) being the most widely used energy estimation unit. In particular, TDN levels of late fattening concentrates affect average daily gain (ADG) and intramuscular fat deposition of fattening cattle (Jeong et al, 2010).…”

“…Increasing the TDN levels in late fattening concentrate has been reported to improve the dry matter (DM) digestibility, energy availability, ADG, and meat quality grade (Chung et al, 2015; Hwang et al, 2014; Ki et al, 2009). To increase the accumulation of intramuscular fat during the late fattening period of Hanwoo steers, feeding high TDN concentrate is advantageous (Ryu, 2017); however, feeding excessively high TDN concentrate may lead to deposition of inedible fat and cause metabolic diseases (Rossi and Compiani, 2016).…”