The Optimal TDN Levels of Concentrates and Slaughter Age in Hanwoo Steers
| Autor: | Y.G. Oh, S.W. Kang, K.H. Kim, Yeoung-Gyu Ko, Joong-Bok Lee, W.Y. Park, S.C. Lee |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Ecology
animal diseases Veterinary (miscellaneous) Marbled meat food and beverages Biology biology.organism_classification Body weight Biochemistry Genetics and Molecular Biology (miscellaneous) Animal science Dactylis glomerata Hanwoo Hay Economic analysis Animal Science and Zoology Gradual increase Slaughter age Food Science |
| Zdroj: | Journal of Animal Science and Technology. 47:731-744 |
| ISSN: | 1598-9429 |
| DOI: | 10.5187/jast.2005.47.5.731 |
| Popis: | Ninety Hanwoo steers (initial BW = 167.2±13.4 kg) were used to determine the effect of energy concentrations in concentrates and slaughter age on performance, carcass characteristics. Steers were allotted by BW to one of eighteen pens. Eighteen pens were randomly allotted to a low (70-70-71-72% for the growing, the early, the middle or the late fattening periods), medium (70-71-72-73%) or high (70-72- 73-74%) TDN level of concentrates. Five steers for each treatment of energy level were slaughtered every one month from 26 month of age to 31 month of age. Concentrates was fed restrictedly to achieve a predicted gain of 0.7~0.9 kg from growing stage to middle fattening stage. All steers were fed orchard grass (Dactylis glomerata L.) hay as roughage during the growing period, fed rice straw gradually substituted for orchard grass hay during the early fattening period, and fed rice straw only thereafter. Overall body weight and feed intake were not affected by TDN levels of concentrates. Average daily gain for all treatments was higher than 0.9 kg/d during the 19~21 month of age and decrease thereafter, but sustained above 0.7 kg/d. Mean concentrates intake for all treatments was 1.0~1.3% of live BW during the growing period and 1.5% during the early fattening. Thereafter, it decreased up to 1.4% during the middle fattening and 1.0% during late fattening period. Delay of slaughter end point resulted in a gradual increase of rib-eye area, back fat thickness and marbling score, especially after slaughter age of 29 month there was significant increases (P |
| Databáze: | OpenAIRE |
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