豫西脂尾羊新品系生产性能研究

发布时间：2018-03-15 00:24

本文选题：豫西脂尾羊新品系　切入点：生长发育　出处：《甘肃农业大学》2017年硕士论文　论文类型：学位论文

【摘要】：本文对舍饲条件下豫西脂尾羊新品系的早期生长发育规律、体重与体尺的相关性、屠宰性能及肉品质进行了研究。分别测定了其体重、体尺指标、屠宰指标和肉品质指标,并分析了体重和体尺的相互关系,屠宰性能和肉品质特性。研究结果如下:1.豫西脂尾羊新品系公母羔3月龄前生长强度最高,4月龄后日增重快速上升。1~6月龄体重增长曲线近似线性,公羊体重与月龄公式为Y=4.4343x-0.0443(R2=0.9921),母羊为Y=4.265x-0.0771(R2=0.9909),公式中Y为体重,x为月龄。2.豫西脂尾羊新品系体重与主要体尺最优回归方程:3.公羊屠宰性能优于母羊,肌肉剪切力和肌肉中Fe含量极显著大于母羊(P0.01),肌纤维直径显著大于母羊(P0.05);常规营养成分、氨基酸和脂肪酸含量公母间差异不显著(P0.05);平均屠宰率为42.39%,熟肉率53.51%;肌肉中水分含量为74.61%,粗脂肪含量为3.19%,粗蛋白质含量为18.74%,灰分为0.95%;矿物质Cu含量为2.62 mg/kg,Fe为93.33 mg/kg,Mn为2.33 mg/kg,Zn为113.99 mg/kg,Mg为1097.04 mg/kg(干物质基础);必须氨基酸含量为38.34%,非必须氨基酸含量为38.02%,氨基酸总量为76.35%(干物质基础);饱和脂肪酸含量为40.65%,不饱和脂肪酸为54.91%。豫西脂尾羊新品系4月龄后增重速度快速上升。体尺与体重的回归方程表明,体长、胸围、管围和尾宽是影响豫西脂尾羊新品系体重的主要体尺指标,在今后选育工作中应重视。其母羊肉嫩度优于公羊,公羊氨基酸和矿物质含量略高于母羊,肉质总体指标在肉用羔羊品种中处于较高水平,具有较好的羔羊肉发展潜力。
[Abstract]:In this paper, the early growth and development law, the correlation between body weight and body size, slaughter performance and meat quality of the new strain were studied. The body weight, body size index, slaughter index and meat quality index were measured respectively. And analyzed the relationship between body weight and body size. Slaughter performance and meat quality characteristics. The results are as follows: 1. The growth intensity of male and female lambs is the highest before 3 months of age, and the daily gain increases rapidly after 4 months of age. The growth curve of body weight at 6 months old is approximately linear. The formula of weight and age of male sheep is YC4.4343x-0.0443AX 0.9921, the formula of ewe is YP4.265x-0.0771R2O0.9909, and the formula Y is weight x = 2.2.The regression equation of weight and main body size of the new line of Yuxi fat-tail sheep is: 3. The slaughtering performance of male sheep is better than that of ewe, and the weight of the new strain of Yuxi fattail sheep is better than that of ewe, and the weight of the new strain of Yuxi fat-tail sheep is better than that of ewe. The muscle shear force and Fe content in muscle were significantly larger than that in ewe (P 0.01), and the diameter of muscle fiber was significantly larger than that of ewe (P 0.05). There was no significant difference in amino acid and fatty acid content between male and female; average slaughter rate was 42.39 and cooked meat rate was 53.51; moisture content in muscle was 74.61; crude fat content was 3.19; crude protein content was 18.74; ash was 0.95; mineral Cu content was 2.62 mg / kg Fe = 93.33 mg / kg mn. 2.33 mg / kg Zn = 113.99 mg / kg mg = 1097.04 mg / kg; essential amino acid content was 38.34; non-essential amino acid content was 38.02; total amino acid content was 76.355.The saturated fatty acid content was 40.65 and unsaturated fatty acid was 54.91. The regression equation between body size and body weight showed that the weight gain rate increased rapidly after 4 months of age. The body length, chest circumference, tube circumference and tail width are the main body size indexes affecting the body weight of the new line of fat tail sheep in the west of Henan Province. The female mutton tenderness is superior to that of the male sheep, and the amino acid and mineral content of the male sheep is slightly higher than that of the ewe. The overall meat quality index is at a higher level in meat lamb varieties, and has a good development potential of lamb meat.
【学位授予单位】：甘肃农业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：S826

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