Effects of feeding beet pulp instead of corn on growth performance, rumen fermentation and microbial characteristics, and blood parameters in Korean cattle steers

Beet pulp;Corn;Korean cattle;Rumen characteristics;Growth performance;630

반추동물영양생리학 ;

University:서울대학교 대학원

关键词: Beet pulp;    Corn;    Korean cattle;    Rumen characteristics;    Growth performance;    630;   

Others  :  http://s-space.snu.ac.kr/bitstream/10371/161191/1/000000157437.pdf

美国|英语

来源: Seoul National University Open Repository

【 摘 要 】

This experiment evaluated the effects of feeding beet pulp (BP) instead of corn on growth performance, ruminal fermentation characteristics, microbial profiles and blood parameters in fattening steers. In experiment 1, two Holstein steers (1054 ± 0 kg) were used for in vitro experiment to compare dry matter (DM) degradability and ruminal fermentation characteristics between corn and BP. In experiment 2, Twelve Korean cattle steers (body weight, 485 ± 19 kg; age, 18.0 ± 0.17 months) were divided into control (corn) and treatment (BP) groups. Both groups were fed the same basal concentrate to meet 80% of the nutrient requirements of Korean cattle for 12 weeks. For the control group, corn (DM) was supplemented for the remaining 20% of the requirement by top dressing; the BP group was supplemented with 17.7% BP plus 2.3% protected-fat to provide the similar energy level as the corn group. In experiment 1, ruminal acetate proportion was higher (P < 0.001) in BP at 6, 12 and 24h compared to corn and concentrate. In experiment 2, dry matter intake (DMI), average daily gain (ADG), and feed conversion ratio (FCR) were not affected by feeding BP instead of corn; nor were iso-butyrate, iso-valerate, valerate proportion, or total volatile fatty acid (VFA) concentrations in the rumen fluid (P > 0.05). However, acetate proportion (P = 0.001) at 4th week, insulin concentration (P = 0.01) at 12th week and relative abundances of cellulolytic bacteria including Fibrobacter succinogenes (P = 0.01) and Ruminococcus albus (P = 0.04) at 12th weeks were higher in BP group compared with corn group, whereas propionate and butyrate proportion, or non-esterified fatty acid (NEFA) at 12th week (P < 0.04) was lower in BP group compared with corn group. Therefore, this experiment suggests that BP could be a good energy source for increasing the acetate proportion without impairing cattle performance in the fattening period.