CAJ | 학술논문

本文旨在研究内蒙古牧区冬春季低质粗料供给条件下,补饲不同能氮比精料对羔羊生长性能及血清指标的影响。采取单因子试验设计选取(61±2)日龄健康、体重为(20.56±1.43) kg断奶的羔羊128只,公母各占1/2,分成4组,每组32个重复,每个重复1只羊,分别补饲消化能( DE)水平相近、粗蛋白质( CP)水平逐渐升高的4种颗粒精料,其能氮比(采用DE/CP)分别为90.03(Ⅰ组)、82.55(Ⅱ组)、73.25(Ⅲ组)、67.87 MJ/kg(Ⅳ组)。试验期40 d。结果表明：1)Ⅲ组平均日增重分别高于Ⅳ组7.75%(P<0.01)、Ⅰ组4.94%(P<0.05)和Ⅱ组3.41%( P>0.05),且该组料重比最优。2)Ⅰ组羔羊末体高极显著低于其他组( P<0.01),其中Ⅱ、Ⅲ、Ⅳ组母羔末体高分别比Ⅰ组高3.68%、4.12%、4.44%( P<0.05)；不同能氮比精料对不同性别羔羊的胸围增长、胸围增长率无显著影响( P>0.05)。3)血清尿素氮含量随着精料蛋白质水平增加而升高,Ⅳ组极显著高于Ⅰ、Ⅱ组( P<0.01)；Ⅲ组羔羊血清中白细胞介素-6含量显著高于Ⅱ、Ⅳ组(P<0.05),免疫球蛋白M含量显著高于其他各组(P<0.05)。结果提示,牧区冬春季枯草期对羔羊及时补饲精料能够取得较好的生长效果,不同能氮比精料对牧区羔羊部分血清指标产生显著影响,补饲精料最适能氮比为73.25 MJ/kg。
본문지재연구내몽고목구동춘계저질조료공급조건하,보사불동능담비정료대고양생장성능급혈청지표적영향。채취단인자시험설계선취(61±2)일령건강、체중위(20.56±1.43) kg단내적고양128지,공모각점1/2,분성4조,매조32개중복,매개중복1지양,분별보사소화능( DE)수평상근、조단백질( CP)수평축점승고적4충과립정료,기능담비(채용DE/CP)분별위90.03(Ⅰ조)、82.55(Ⅱ조)、73.25(Ⅲ조)、67.87 MJ/kg(Ⅳ조)。시험기40 d。결과표명：1)Ⅲ조평균일증중분별고우Ⅳ조7.75%(P<0.01)、Ⅰ조4.94%(P<0.05)화Ⅱ조3.41%( P>0.05),차해조료중비최우。2)Ⅰ조고양말체고겁현저저우기타조( P<0.01),기중Ⅱ、Ⅲ、Ⅳ조모고말체고분별비Ⅰ조고3.68%、4.12%、4.44%( P<0.05)；불동능담비정료대불동성별고양적흉위증장、흉위증장솔무현저영향( P>0.05)。3)혈청뇨소담함량수착정료단백질수평증가이승고,Ⅳ조겁현저고우Ⅰ、Ⅱ조( P<0.01)；Ⅲ조고양혈청중백세포개소-6함량현저고우Ⅱ、Ⅳ조(P<0.05),면역구단백M함량현저고우기타각조(P<0.05)。결과제시,목구동춘계고초기대고양급시보사정료능구취득교호적생장효과,불동능담비정료대목구고양부분혈청지표산생현저영향,보사정료최괄능담비위73.25 MJ/kg。
This study was aimed to investigate the effects of supplementation of concentrates with different rati-os of energy to nitrogen on performance and serum indices in weaner lambs in pastoral areas of Inner Mongolia that only had low quality roughages in winter and spring. One hundred and twenty eight ( half male and half fe-male) healthy weaner lambs aged (61±2) days with weight of (20.56±1.43) kg were assigned to four groups using single factor experimental design. There were 32 replicates in each group and 1 lamb in each replicate. Lambs in four groups were supplemented with concentrates with similar digestive energy ( DE) level and grad-ually increased crude protein ( CP) levels, and the ratio of energy to nitrogen ( calculated by DE/CP) was 90.03 (group Ⅰ), 82.55 (group Ⅱ), 73.25 (group Ⅲ) and 67.87 MJ/kg (group Ⅳ), respectively. The experiment lasted for 40 days. The results showed as follows:1) average daily gain of groupⅢ was the high-est, and was 7.75%, 4.94%, 3.41% higher than that of groups Ⅳ (P<0.01), Ⅰ (P<0.05) and Ⅱ (P>0.05) , respectively. Moreover, group Ⅲ had optimal feed/gain. 2) Final withers height of groupⅠ was sig-nificantly lower than that of the other groups (P<0.01), that of female lambs of groups Ⅱ, Ⅲ and Ⅳ was 3.68%, 4.12% and 4.44% higher than that of group Ⅰ (P<0.05); the gain and growth rate of heart girth were not significantly affected by supplementation of concentrate with different ratios of energy to nitrogen or gender ( P>0.05) . 3) Serum content of urinary nitrogen gradually increased with the increasing of concentrate protein level, and groupⅣ was significantly higher than groupsⅠ andⅡ ( P<0.01);serum content of inter-leukin 6 of group Ⅲ was significantly higher than that of groups Ⅱ and Ⅳ ( P<0.05) , and serum content of immunoglobulin M was higher than that of the other groups (P<0.05). The results indicate lambs in pastoral areas can achieve better growth performance when they were timely supplied concentrate. Under conditions in the present study, concentrates with different ratios of energy to nitrogen have a significant impact on some ser-um indices, and the optimum ratio of energy to nitrogen of the concentrate is 73.25 MJ/kg.