Impact of varying protein levels in meals on the meat quality of housed male yaks
The purpose of this research was to surveys the influence of different protein level of rations on the quality and feeding efficiency of yak meat.Twenty-four healthy male yaks of similar age,and primary weight(200±20)kg were selected and randomly divided into two groups of 12 yaks each.The protein level of the diet was 12％for the low-protein group Ⅰ and 16％for the high-protein group Ⅱ,and the energy level was 11.7 MJ/kg for both groups,with the two groups serving as controls for each other.The test pre-test period was 10 d,and the normal test period was 180 d,at the end of the feeding,five male yaks were random selection from each group.The longest dorsal muscle and triceps muscle of yaks were cut for meat quality evaluation.The results showed that:(1)Compared with group Ⅰ and group Ⅱ,the effect of different protein level rations on pH45min in the longest back muscle of yaks was significant(P＜0.05),both were in the normal range.Diets with different protein levels had no significant effects on pH24h of longest back musele and pH45 min and pH24 h of triceps brachii muscle(P＞0.05).Diets with different protein levels had no significant effect on meat color brightness,yellowness and redness of triceps muscle of yaks(P＞0.05).(2)There were no significant effects of different protein levels on adhesion,elasticity,cohesion,recoverable deformation,recoverable work,elasticity and adhesion of the longest back muscle of yaks(P＞0.05).(3)Compared to the high-protein group,the low-protein group had higher gross profit,with an increase of about 81.5％in gross profit.Limited effect of different protein diets on the quality of male yak meat,taking into account the feeding efficiency,when the metabolic energy level was 11.7 MJ/kg,the crude protein level of the whole mixed ration for housed male fattened yaks at 12％was the most suitable.
万方数据
维普
