[국내논문]Effect of Total Digestible Nutrients Level of Concentrates on Growth Performance, Carcass Characteristics, and Meat Composition of Korean Hanwoo Steers원문보기
Ahn, Jun Sang
(Hanwoo Research Institute, National Institute of Animal Science, RDA)
,
Son, Gi Hwal
(Dept. of Animal Life Science, Kangwon National University)
,
Kim, Min Ji
(Dept. of Animal Life Science, Kangwon National University)
,
Choi, Chang Six
(Kangwon Livestock Technology Research Institute)
,
Lee, Chang Woo
(Kangwon Livestock Technology Research Institute)
,
Park, Joong Kook
(Nonghyup Feed Co., LTD.)
,
Kwon, Eung Gi
(Hanwoo Research Institute, National Institute of Animal Science, RDA)
,
Shin, Jong Suh
(Dept. of Animal Life Science, Kangwon National University)
,
Park, Byung Ki
(Nonghyup Feed Co., LTD.)
This study was conducted to investigate the effect of the total digestible nutrients (TDN) level of commercial concentrates on growth performance, carcass characteristics, and meat composition of late fattening Hanwoo steers. A total of 28 steers were randomly assigned to one of four dietary groups;...
This study was conducted to investigate the effect of the total digestible nutrients (TDN) level of commercial concentrates on growth performance, carcass characteristics, and meat composition of late fattening Hanwoo steers. A total of 28 steers were randomly assigned to one of four dietary groups; T1 (73.30% TDN), T2 (74.50% TDN), T3 (76.40% TDN), and T4 (77.10% TDN). Average daily gain (ADG) was slightly but not significantly higher in the T2 than in the other treatments. Dry matter intake (DMI) and feed conversion ratio (FCR) were higher in the T2 than in the other treatments; however, the differences were not statistically significant. Carcass back fat thickness was thicker in the T4 and marbling score was higher in the T2 than in the other treatments; however, the differences were not statistically significant. The TDN level of concentrates had no effect on the physicochemical characteristics and fatty acid composition of the longissimus muscle. The finding of this study indicate that less than 74% or greater than 75% TDN in the commercial concentrate did not contribute to improve ADG, FCR, marbling score; therefore, in the present study, the recommendable TDN level in the commercial concentrate for late fattening period was 74% to 75% in terms of growth performance and marbling score of Hanwoo steer.
This study was conducted to investigate the effect of the total digestible nutrients (TDN) level of commercial concentrates on growth performance, carcass characteristics, and meat composition of late fattening Hanwoo steers. A total of 28 steers were randomly assigned to one of four dietary groups; T1 (73.30% TDN), T2 (74.50% TDN), T3 (76.40% TDN), and T4 (77.10% TDN). Average daily gain (ADG) was slightly but not significantly higher in the T2 than in the other treatments. Dry matter intake (DMI) and feed conversion ratio (FCR) were higher in the T2 than in the other treatments; however, the differences were not statistically significant. Carcass back fat thickness was thicker in the T4 and marbling score was higher in the T2 than in the other treatments; however, the differences were not statistically significant. The TDN level of concentrates had no effect on the physicochemical characteristics and fatty acid composition of the longissimus muscle. The finding of this study indicate that less than 74% or greater than 75% TDN in the commercial concentrate did not contribute to improve ADG, FCR, marbling score; therefore, in the present study, the recommendable TDN level in the commercial concentrate for late fattening period was 74% to 75% in terms of growth performance and marbling score of Hanwoo steer.
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제안 방법
Therefore, the present study was conducted to investigate the effect of TDN levels in commercial concentrate on growth performance, carcass characteristics, and meat composition of Hanwoo steers during the late fattening period.
The ADG was calculated by measuring body weight at 10:00 every 2 months. Feed intake was measured daily by measuring the leftover feed still present before the morning feeding.
, Tokyo, Japan). The analyses included measurements of albumin (ALB), alanine aminotransferase (ALT), blood urea nitrogen (BUN), calcium (Ca), cholesterol (CHO), gamma-glutamyl transpeptidase (GGT), glucose (GLU), magnesium (Mg), non-esterified fatty acid (NEFA), phosphorus (P), triglyceride (TG), and total protein (TP).
Marbling score, meat color, fat color, texture, and maturity were measured as the carcass quality traits. Carcass weight, back fat thickness, and rib eye area were measured as the carcass yield traits, and then the carcass yield index was calculated using the values of these traits. The carcass yield index=[68.
대상 데이터
Experimental diets were composed of four late fattening concentrates from four Korean feed companies. The concentrates were fed at 1.
데이터처리
The linear model was analyzed using the SAS package 9.1 software program and the variance analysis was performed using the Type Ⅲ squared fit for unbalanced data among the four squares presented in the SAS/GLM analysis. The statistical significance of the differences between the least squares averages of the treatments was tested with the following null hypothesis at a significance level of 5%: Ho: LSM (i)=LSM (j), where, LSM (i(j)) is the least squares average of the I (j) the effects (I ≠ j).
이론/모형
Fatty acid composition of the longissimus muscle was measured according to the methods of Folch (1957). In brief, 0.
At the end of the experimental period (30 months of age), all animals were slaughtered at the local slaughterhouse to assess carcass yield and quality traits. Carcass evaluation was performed at the 13th rib section from the left side of each carcass by meat graders using the criteria provided by the Korean carcass grading system (MAFRA, 2017). Marbling score, meat color, fat color, texture, and maturity were measured as the carcass quality traits.
성능/효과
The finding of this study indicate that less than 74% or greater than 75% TDN in the commercial concentrate did not contribute to improve ADG, FCR, marbling score; therefore, in the present study, the recommendable TDN level in the commercial concentrate for late fattening period was 74% to 75% in terms of growth performance and marbling score of Hanwoo steer.
2) Grading ranges are 1 to 9 for marbling score with higher numbers for better quality (1, devoid; 9, abundant); meat color (1, bright red; 7, dark red); texture (1, soft; 3, firm); maturity (1, youthful; 9, mature).
The rib eye area was slightly but not significantly lower in the T3 than in the other treatments. The yield index was slightly but not significantly higher in the order of T3, T2, T1, and T4, and the TDN level of the concentrate had little effect on the carcass yield traits of Hanwoo steers.
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