CAJ | 학술논문

本研究旨在研究烟酸对未去势湘中公牛生长性能、肉品质和血清生化指标的影响。选择1.5岁左右体重[(385.08±15.20) kg]匀称的未去势湘中黑公牛21头,随机分成3组,每组7头,各组分别在基础饲粮中添加0、800、1200 mg/kg烟酸。预试期14 d,正试期120 d。结果表明：烟酸对公牛的平均日增重、日均采食量、饲料转化率、背膘厚、眼肌面积均没有显著影响(P>0.05)。烟酸对背最长肌的pH、肉色亮度和红度值、剪切力、滴水损失以及水分、粗脂肪和粗蛋白质含量均没有显著影响( P>0.05)。1200 mg/kg烟酸显著降低血清总胆固醇和高密度脂蛋白胆固醇(HDL-C)含量(P<0.05),800 mg/kg烟酸显著降低血清HDL-C含量(P<0.05),烟酸对低密度脂蛋白胆固醇含量没有显著影响( P>0.05)。1200 mg/kg烟酸可以提高血清非酯化脂肪酸( P<0.05)和葡萄糖含量( P=0.06),降低血清尿素氮含量( P=0.07)。综上,本研究并没有观察到烟酸对未去势湘中公牛生长性能和肉品质等指标有影响,但对血脂指标有一定调节作用,推测可能是未去势公牛的雄性激素的作用覆盖了烟酸的作用。
본연구지재연구연산대미거세상중공우생장성능、육품질화혈청생화지표적영향。선택1.5세좌우체중[(385.08±15.20) kg]균칭적미거세상중흑공우21두,수궤분성3조,매조7두,각조분별재기출사량중첨가0、800、1200 mg/kg연산。예시기14 d,정시기120 d。결과표명：연산대공우적평균일증중、일균채식량、사료전화솔、배표후、안기면적균몰유현저영향(P>0.05)。연산대배최장기적pH、육색량도화홍도치、전절력、적수손실이급수분、조지방화조단백질함량균몰유현저영향( P>0.05)。1200 mg/kg연산현저강저혈청총담고순화고밀도지단백담고순(HDL-C)함량(P<0.05),800 mg/kg연산현저강저혈청HDL-C함량(P<0.05),연산대저밀도지단백담고순함량몰유현저영향( P>0.05)。1200 mg/kg연산가이제고혈청비지화지방산( P<0.05)화포도당함량( P=0.06),강저혈청뇨소담함량( P=0.07)。종상,본연구병몰유관찰도연산대미거세상중공우생장성능화육품질등지표유영향,단대혈지지표유일정조절작용,추측가능시미거세공우적웅성격소적작용복개료연산적작용。
The aim of this study was to test the effects of nictinic acid ( NA) on performance, meat quality and serum biochemical parameters of uncastrated Xiangzhong bulls. Twenty-one 1. 5-year-old uncastrated Xiang-zhong black bulls with similar body weight [(385.08±15.20) kg] were randomly assigned to three groups with seven individuals in each group. The experimental animals from each group were provided with a basal di-et added 0, 800 and 1 200 mg/kg NA, respectively. The pre-experimental period lasted for 14 days, and the experimental period lasted for 120 days. The results showed as follows:NA had no significant effects on aver-age daily gain, average daily feed intake, feed conversion rate, back fat thickness and loin eye area of uncas-trated bulls (P>0.05). It also had no significant effects on pH, meat color L? and a? values, shear force, drip loss and the contents of moister, ether extract and crude protein of longissimus muscle (P>0.05). The supplementation of 1 200 mg/kg NA significantly reduced the serum total cholesterol and high density lipopro-tein cholesterol ( HDL-C) contents ( P<0.05) , and that of 800 mg/kg NA significantly reduced serum HDL-C content ( P<0.05) , but NA had no significant effect on serum low density lipoproten-cholesterol content ( P>0.05) . The supplementation of 1 200 mg/kg NA could increase serum nonesterified fatty acid ( P<0.05) and glucose contents (P=0.06), but could decrease serum urea nitrogen content (P=0.07). In conclusion, no effects of NA are observed on growth and meat quality of uncastrated bulls, but NA has some regulation effects on blood lipids, which may due to that the effects of androgen in uncastrated bulls covered the effects of NA.