斷奶羔羊4種必需氨基酸限制性順序和需要量模型探索
[Abstract]:The aim of this study was to study the restrictive sequence and requirement model of four essential amino acids in weaned lambs by partial amino acid deduction. A total of 100 50-day-old weaned Hu sheep were randomly divided into 5 groups with 4 replicates in each group and 5 sheep in each replica. The control group was amino acid balanced (PC) group. On the basis of PC, lysine (PD-Lys), methionine (PD-Met), threonine (PD-Thr) and tryptophan (PD-Trp) were deducted from the diet of the four experimental groups. The contents of other amino acids remained the same. The pre-test period was 10 days and the positive test period was 60 days. At the age of 6090 and 120 days, 6 lambs were slaughtered randomly in each group of 120 days of age. The results showed that the average daily gain (ADG) of PD-M et group was significantly lower than that of other groups (P0.05), and the feed conversion rate (Fr / G) was significantly higher than that of other groups (P0.05). The body weight, eye muscle area and head weight of PD-Met group were significantly higher than those of other groups (P0.05). The hoof weight and fur weight were significantly lower than those of PCP PD-Thr and PD-Trp groups (P0.05), but there was no significant difference in slaughtering rate (DP) gr and blood weight among the five groups (P0.05). When the best ADG and F / G were used as the evaluation indexes, the restriction order of amino acid was MetLysThr and Trp at 6090 day and 120th day of age respectively; The restrictive sequence of amino acids in the 120-day old of Jia-DP is TrpP-Thrrrr-Lys.3.) the optimum ratio of ADG to Trp is 100: 444444: 8 and 100: 422: 3812, respectively, when the best ADG is used as the evaluation index for 600-day and 120-day-old Lys-Met THR and Trp, respectively, and the optimum ratio is 100: 4444: 8 and 100: 422: 12; the optimum ratio is 100: 4444: 8 and 100: 42: 38: 12, respectively. The suitable ratios of F / G to Trp are 100: 54: 45: 7 and 100: 47: 39: 12, respectively, and the suitable ratio of Trp to Trp is 100: 34: 38: when the best DP is taken as the evaluation index. In a word, the deficiency of dietary essential amino acids (Lyschus Metallothr and Trp) seriously affected the growth performance of weaned lambs, butchery performance and organ index, especially Met, were the most obvious, followed by Lysn Thr and Trp. The restrictive order and need model of Lysmeter Thr and Trp obtained from different evaluation indexes (ADGG / F / G and DP) and different growth stages are different.
【作者單位】: 塔里木大學(xué)動(dòng)物科學(xué)學(xué)院;中國(guó)農(nóng)業(yè)科學(xué)院飼料研究所農(nóng)業(yè)部飼料生物技術(shù)重點(diǎn)開(kāi)放實(shí)驗(yàn)室;
【基金】:農(nóng)業(yè)部公益性行業(yè)(農(nóng)業(yè))科研專項(xiàng)(201303143) 國(guó)家肉羊產(chǎn)業(yè)技術(shù)體系建設(shè)專項(xiàng)資金(CARS-39)
【分類號(hào)】:S826.5
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