Effects of Feeding Patterns of Concentrate on Growth Performance, Blood Parameters and Carcass Characteristics in Fattening Hanwoo Cows

Abstract

This study was conducted to investigate the effects of feeding patterns of concentrates on growth performance, blood parameters and carcass characteristics in Hanwoo cows. Randomly-allocated groups, restricted concentrate feeding (T1), restricted concentrate feeding for 6 months and ad libitum 2 months (T2), restricted concentrate feeding for 4 months and ad libitum 4 months (T3), were contained with 9 animals. According to feeding patterns of concentrate, growth performance was not significantly different among the treatment groups. However, ADG tended to be higher in T2 group (0.75 kg/d) compared to the other groups (T1: 0.62 kg/d, T3: 0.72 kg/d). DMI was not significantly different among the treatment groups, interestingly, rice straw intake was significantly higher in T1 group compared with others (p<0.05). There were significant difference among feed conversion ratio, which are 17.8, 12.8, and 14.1 kg for T1, T2, and T3 (p<0.05), respectively. The serum level of albumin, triglyceride, glucose and GPT were greater in T3 group compared to other groups at fattening 6 to 8 months (p<0.05). The results of yield traits, carcass weight, back fat thickness and rib eye area were not differ among treatment groups, but yield index was significantly greater in T2 group compared to T1 group (p<0.05). The 'A' appearance rate (%) of meat yield grade was highest in T2 group for 78%. The marbling score, meat color, fat color, texture and maturity in quality traits were not differ among the treatment groups. However, marbling score and appearance rate (%) of over 1st meat quality grade were tend to be increased at T3 rather (4.0, 56%) group compared with other groups (T1: 3.4, 56%; T2: 3.6, 33%). Thus, the present study suggested that restricted concentrate feeding (1.6% of BW) for 4 months during early fattening periods and ad libitum feeding for 4 months during late fattening periods are recommendable.

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

“…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. Lee (2017) reported that there was no difference in the ADG and FCR between the control (TDN 72.21%) and the high energy treatment (TDN 75.96%). In contrast, Ahn et al (2016) reported that the ADG and FCR of the treatments with lower TDN were better than those of the control.…”

“…In particular, TDN levels of late fattening concentrates affect average daily gain (ADG) and intramuscular fat deposition of fattening cattle (Jeong et al, 2010). Therefore, it is an important factor for producing high quality meat from Hanwoo steers (Lee, 2017).…”

“…Recently, in Korea, studies have been undertaken on the shortening of the fattening period and appropriate age of slaughter to reduce feed costs and decrease the production of inedible fat (Hong, 2016; Yoon et al, 2013). Additionally, studies have been conducted with regard to increasing the TDN level of concentrates to maintain the marbling score while shortening the fattening period have been (Chung et al, 2018; Lee et al, 2013).…”