Research On The Effects Of Resting Time For The Elimination Of Transport Stress In Cattle

With the rapid development of beef cattle production, the number of beef laughtering centralized transportation is increasing in China,Transport stress has become one of the most important stress factors inevitably in production of beef cattle. Transport stresseasily cause injury and physiological function, affects the animal production p erformance and decline the meat quality. Pre-slaughter rest is the main way to reliev e the long-distance stress, improving the production performance and meat quality o f beef cattle to a certain extent. After investigation found that the current domestic en terprises mainly use 0-24 h within the rest convalesce, the effect is not ideal, resulting i n beef cattle weight continued to decline, reducing the quality of meat.In this experiment, some provinces of our country beef cattle slaughtering enterp rises were investigated, summarized before slaughter management status; and study the effect of rest time more than 24 h to provide theoretical reference for China’s beef s laughter.1.Investigation and management of beef cattle before slaughterLong-distance transportation of beef cattle accounted for a larger proportion in China; the live weight decreased significantly after a long-distance transportation, th e slaughter rateand net meat rate decreased, resulting in economic losses; most enterp rises ignore the pre slaughter rest, no rest or rest time is too short, resting time do not consider the transport distance, the lack of scientific and reasonable transport stress elimination technique.2.Study on the effects on physiological and biochemical and muscle tissue of th e resting time in beef cattleIn order to study the effects of rest time to eliminate transport stress on beef c attle, to select the appropriate beef resting time for the actual production of the enter prise, 36 Simmental bulls were selected with similar weight(600+50kg), six were not transported as the control group.Identifierred before transported, weighed.after transp ortation kill six respectively at 0h, 24 h, 72 h, 120 h, 168 h, taking blood, for the det ermination of physiological and biochemical indexes, measured indicators of meat qua lity of slaughter back mature 72 h acid. The results show that, after the long-distance tr ansportation the meat quality of immediate slaughterred reduced; blood physiological and biochemical indexes, p H value, drip loss, cooking loss, shear force and other in dicators show recovery during 72 h to 120 h sanatorium, and colse to the control grou p(test results in the specific part); in the rest of 168 h, blood biochemical index and me at quality showed a downward trend, may produce new stress. Rest 72~120h after lon g-distance transport.3.Effect of resting time on the production performance of long-distance transport ation beef cattleThe experimental study on the live weight loss rate,the dynamic changes of meat r ate, net meat rate, economic benefits in resting 0h-168 h. similar weight(600kg+50kg) S immental 36 bulls were selected, of which 6 head as the control group. Identifierred b efore transported,weighed.After transportation kill six respectively at 0h, 24 h, 72 h, 120 h, 168 h, weighing after slaughter. The results show that: in the process of resting, l ive weight loss rate decrease from 0h to 72 h,from 72 h to 168 h were increased; restin g 72 h group net meat rate was significantly higher than other groups(P<0.05); compare d with the control group,resting 0h group has the maximum market value, 72 h group has the minimum market value. The live weight loss rate of resting 72 h group was the lowest, net meat rate, meat rate, economic accounting closest to the control gro up. Therefore, after long distance transportation, suggest rest 72 h.