| This paper mainly studied the effects of feeding modes and the age of Arbas white cashmere goats on the trace element digestibility and its distribution in muscle. The results provided a important theoretical basis for scientific use of trace elements in ration of cashmere goats.Thirty female Arbas white cashmere goats with similar age and body weight and thirty weaned lambs of four-months were used as the grazing group from Inner Mongolia white cashmere goat breeding farm. Their age and weight were similar. Another thirty female cashmere goats and thirty weaned lambs similar to grazing group were feeding in houses from the eliminated group. A total of 120 were divided into 4 groups, each group of 30.The experiment was designed with 2×2 completely randomized design, the first factor was feeding modes, included grazing and confinedness. Grazing goats were without supplements, and housing goats were fed total mixed ration. The second factor was age, included 5 years-old female goats and four-months weaned lambs.The fattening period of female goats was divided into 2 phases, early and late, a total of two months.The weaned lambs fattening period was divided into 3 phases, early, mid and last, a total of three months.The trials included two parts. Trial 1 studied the effects of different feeding modes on the trace elements digestibility of female goats and weaned lambs.Six cashmere goats from each group were sampled in the early and late fattening period. The digestibility of Co, Fe, Cu, Mn, Se, Zn was determined by endogenous indicator in early period, and the digestibility of Zn, Mn, Fe and Cu was determined by collecting rectal feces samples in late period. Trial 2 studied the effects of different feeding modes on the trace elements content in muscle of female goats and weaned lambs. After the end of the trail, arm triceps, biceps femoris, gluteus and longissimus were collected and determined the content of Co, Cu, Fe, Mn, and Zn.The results indicated:(1) There were differences on the digestibility of trace elements between different ages of cashmere goats. In the late period, compared with the lambs, the Cu and Zn digestibility of female goats were higher (P＜0.01); howevere, Fe and Mn digestibility were lower (P< 0.05).(2) The trace elements content of different age cashmere goats were also different. The content of Cu and Se in brachial triceps (P<0.01), Fe, Mn and Zn in biceps femoris muscle (P<0.01), Se in the longissimus (P=0.03) and the content of each element in gluteal of female goats group were significantly higher than the lambs group. However, Zn, Fe and Mn in brachial triceps (P< 0.05), Se (P< 0.05) in the biceps femoris and Mn, zinc in longissimus (P< 0.01) was significantly lower than the lamb group; the content of Fe in longissimus had a trend lower than the lambs group (P= 0.07).(3) Compared with grazing feeding,house feeding could significantly increase the content of Zn in brachial triceps (P<0.05) and that of Fe, Zn in the biceps femoris (P<0.01). In addition house feeding could significantly improve digestibility of Cu, Mn during the whole fattening period (P<0.05) and digestibility of Zn in the late period (P< 0.01).(4) All in all, for the different muscles of cashmere goats, there were the most abundant trace elements in the longissimus of lambs and gluteal of female goats. For the different feeding modes, the content of Fe and Mn in the gluteal, Cu in longissimus and Se in the biceps femoris were rich.(5) The interaction effect of age and feeding mode on trace elements of muscle was was related to muscle parts. |
PDF Full Text Request