本文選題：新疆褐牛種公牛　切入點(diǎn)：胴體分級(jí)　出處：《寧夏大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：本試驗(yàn)以27頭1-6月齡的新疆褐牛種公牛為研究對(duì)象,根據(jù)育肥期將它們分為A(16mon)、 B(19mon)、C(22mon)三組,每組9頭,首先將三組牛進(jìn)行育肥試驗(yàn),然后對(duì)12頭育肥后的牛進(jìn)行屠宰和肉質(zhì)分析試驗(yàn),最后分析新疆褐牛種公牛生長性能、產(chǎn)肉性能和肉質(zhì)特性。結(jié)果如下：1 16～22月育肥期內(nèi),育肥期越長,新疆褐牛種公牛體尺、體重越大。三組試驗(yàn)牛十字部高、體高、胸圍、管圍和體重ABC,C組體高、胸圍和體重極顯著高于A、B兩組(P0.01),十字部高顯著高于A、B兩組(P0.05),A組和B組無顯著差異；體斜長、管圍和出生重三組間無顯著差異；平均日增重ABC,A組極顯著高于B、C兩組(P0.01)。210-28月齡內(nèi),新疆褐牛種公牛體尺越大,體重越大。體尺和體重生長發(fā)育曲線一致,各體尺指標(biāo)和體重均具有極顯著的強(qiáng)相關(guān)(P0.01),胸圍和體重相關(guān)性最強(qiáng)(r=0.996)。316～22月育肥期內(nèi),新疆褐牛種公牛的屠宰率、凈肉率、肉骨比、優(yōu)質(zhì)肉產(chǎn)量較高,胴體重、眼肌面積越大,優(yōu)質(zhì)肉產(chǎn)量越高。三組試驗(yàn)牛屠宰率、凈肉率、肉骨比、心、肝、脾、肺、腎、尾重?zé)o顯著差異,屠宰率、凈肉率、肉骨比分別為57.82%、42.21%、3.27：1：里脊、外脊、眼肉和胴體重、眼肌面積顯著中度相關(guān)(P0.05),上腦、腱子肉、霖肉和胴體重、眼肌面積極顯著中度相關(guān)(P0.01)。416-22育肥期內(nèi),新疆褐牛種公牛肉的蒸煮損失率、滴水損失率、pH值、常規(guī)營養(yǎng)成分、氨基酸含量和組成無顯著差異,育肥期越長,肉質(zhì)越老。新疆褐牛背最長肌剪切力和眼肌面積ABC,C組剪切力極顯著高于A組(P0.01),眼肌面積顯著高于B組(P0.05)。育肥期越長,剪切力值和眼肌面積越大,肉質(zhì)越老。新疆褐牛背最長肌中含有17中氨基酸,測(cè)得氨基酸含量為21.93g/100g,鮮味氨基酸含量占總氨基酸含量的44.05%。綜上所述,胸圍、體斜長可作為估測(cè)新疆褐牛種公牛體重的量化指標(biāo)；新疆褐牛種公牛產(chǎn)肉性能較高,眼肌面積可作為評(píng)價(jià)產(chǎn)肉性能的主要指標(biāo)；剪切力可作為比較新疆褐牛種公牛肌肉嫩度的指標(biāo)。
[Abstract]:In this experiment, 27 Xinjiang brown oxen (1-6 months old) were divided into three groups according to the fattening period. Then 12 fattening cattle were slaughtered and meat quality analyzed. Finally, the growth performance, meat yield and meat quality characteristics of Xinjiang brown cattle were analyzed. The results were as follows: during the fattening period of 1 ~ 16 ~ 22 months, the longer the fattening period was, the more the body size of Xinjiang Brown cattle was. The body height, body height, chest circumference, tube circumference and body weight of the three groups were significantly higher than those of the Agna B group (P 0.01), and the cross part height was significantly higher than that of the Agna B group (P 0.05) and the B group (P 0.05). There was no significant difference in tube circumference and birth weight among the three groups, and the average daily gain of ABCX A group was significantly higher than that of BPC group P0.01U. 210-28 months old. The larger the body size of Xinjiang brown cattle, the larger the body weight, the more the body size and the body weight growth and development curve. There was a strong correlation between body size and body weight, and the strongest correlation was between chest circumference and body weight. During the fattening period, the slaughter rate, net meat rate, meat to bone ratio, quality meat yield, carcass weight and eye muscle area of Xinjiang Brown cattle bulls were higher than those of Xinjiang Brown cattle bulls during the fattening period. There was no significant difference in slaughter rate, net meat rate, meat to bone ratio, heart, liver, spleen, lung, kidney and tail weight among the three groups. The slaughter rate, net meat rate and meat to bone ratio were 57.82%, 42.21% and 3.271: 1 respectively. Eye muscle area was significantly and moderately correlated with P0.05, upper brain, tendon meat, wet meat and carcass weight. The area of eye muscle was significantly correlated with P0.01g. 416-22 during the fattening period, the steaming loss rate, dropping water loss rate and pH value of male beef of Xinjiang Brown cattle were significantly higher than those of normal nutritional components. There was no significant difference in amino acid content and composition. The longer the fattening period, the older the meat quality. The shear force of longissimus dorsi muscle and the area of eye muscle in group A were significantly higher than those in group A, and the area of eye muscle in group A was significantly higher than that in group B. The larger the shearing force and the area of the eye muscle, the older the meat quality. The longissimus dorsi muscle of Xinjiang Brown cattle contains 17 amino acids, the measured amino acid content is 21.93 g / 100 g, and the fresh amino acid content accounts for 44.05% of the total amino acid content. To sum up, the chest circumference, The oblique length of body can be used as a quantitative index to estimate the weight of Xinjiang brown cattle, and the area of eye muscle can be used as the main index to evaluate the meat yield of Xinjiang brown cattle. Shear stress can be used as an index to compare muscle tenderness of Xinjiang brown bull.
【學(xué)位授予單位】：寧夏大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：S823

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本文編號(hào)：1562828