CAJ | 학술논문

本试验研究了不同精粗比全混合颗粒饲粮对母羊营养物质表观消化率、氮代谢和能量代谢的影响，以确定母羊饲粮适宜精粗比[或中性洗涤纤维（ NDF）水平]。试验采用单因素完全随机区组设计，将30只体况良好、8月龄、体重相近的杂交母羊（萨福克羊×阿勒泰羊）随机分为6个处理，每个处理5只羊，分别饲喂6种不同精粗比（85∶15、70∶30、55∶45、40∶60、25∶75、10∶90）的全混合颗粒饲粮。预试期10 d，消化代谢试验18 d，呼吸测热试验2 d。结果表明：1）全混合颗粒饲粮精粗比对母羊干物质（ DM ）、有机物（ OM ）和 NDF表观消化率均产生了极显著影响（ P＜0．01），DM和OM表观消化率随精粗比的上升而升高，精粗比为55∶45的饲粮NDF表观消化率最高，与精粗比为85∶15和70∶30的饲粮差异不显著（ P＞0．05）。2）消化氮随着精粗比的上升而升高，过高或过低精粗比均不利于氮的沉积，精粗比为55∶45时，母羊对氮的利用效率最高。3）消化能、代谢能、总能消化率和总能代谢率均随着精粗比的上升而出现极显著的升高（ P＜0．01）。在本试验条件下，母羊对精粗比为70∶30和55∶45（ NDF水平分别为37．78％和45．80％）的全混合颗粒饲粮消化吸收较好。
본시험연구료불동정조비전혼합과립사량대모양영양물질표관소화솔、담대사화능량대사적영향，이학정모양사량괄의정조비[혹중성세조섬유（ NDF）수평]。시험채용단인소완전수궤구조설계，장30지체황량호、8월령、체중상근적잡교모양（살복극양×아륵태양）수궤분위6개처리，매개처리5지양，분별사위6충불동정조비（85∶15、70∶30、55∶45、40∶60、25∶75、10∶90）적전혼합과립사량。예시기10 d，소화대사시험18 d，호흡측열시험2 d。결과표명：1）전혼합과립사량정조비대모양간물질（ DM ）、유궤물（ OM ）화 NDF표관소화솔균산생료겁현저영향（ P＜0．01），DM화OM표관소화솔수정조비적상승이승고，정조비위55∶45적사량NDF표관소화솔최고，여정조비위85∶15화70∶30적사량차이불현저（ P＞0．05）。2）소화담수착정조비적상승이승고，과고혹과저정조비균불리우담적침적，정조비위55∶45시，모양대담적이용효솔최고。3）소화능、대사능、총능소화솔화총능대사솔균수착정조비적상승이출현겁현저적승고（ P＜0．01）。재본시험조건하，모양대정조비위70∶30화55∶45（ NDF수평분별위37．78％화45．80％）적전혼합과립사량소화흡수교호。
This experiment was conducted to investigate the effects of different concentrate to roughage ratios of total mixed pellet diet ( TMPD) on nutrient apparent digestibility, nitrogen metabolism and energy metabo-lism of ewes, and to determine dietary optimal concentrate to roughage ratio [ or neutral detergent fiber ( NDF) level] of ewes. Thirty healthy crossbred ewes ( Suffolk sheep×Aletai sheep) aged 8 months with similar body weight were randomly assigned to six treatments with five sheep in each treatment by a single factor completely randomized block design. Ewes in different treatments were fed TMPDs with six concentrate to roughage rati-os, which were 85∶15, 70∶30, 55∶45, 40∶60, 25∶75 and 10∶90, respectively. The pre-test lasted for 10 days, the digestion and metabolism test lasted for 18 days, and the respiratory calorimetry test lasted for 2 days. The results showed as follows:1) the effects of concentrate to roughage ratio of TMPD on the apparent digestibility of dry matter ( DM) , organic matter ( OM) and NDF were significant ( P<0.01) . The apparent digestibility of DM and OM were increased with the increasing of concentrate to roughage ratio. The apparent digestibility of NDF was highest in diet with concentrate to roughage ratio of 55∶45, which was not significantly from diets with concentrate to roughage ratios of 85∶15 and 70∶30 ( P>0.05) . 2) Digestible nitrogen was increased with the increasing of concentrate to roughage ratio, too high or too low concentrate to roughage ratio were not con-ducive to nitrogen retention, and nitrogen efficiency was highest when concentrate to roughage ratio was 55∶45. 3) The digestive energy, metabolizable energy, gross energy digestibility and gross energy metabolic rate were significantly increased with the increasing of concentrate to roughage ratio ( P<0.01) . Under the experimental condition, ewes have higher digestion and absorption of TMPDs with concentrate to roughage ratios of 70∶30 and 55∶45 ( NDF levels are 37. 78% and 45. 80%, respectively.