不同水平苜蓿添加量对断奶前羔羊生长性能和瘤胃发育的影响

摘要

This experiment was conducted to study the effects of adding different levels of alfalfa hay on the growth performance and rumen morphology development of lamb before and after weaning.A total of 30 castrated Suffolk × Small Tailed Han Sheep male lambs with similar age and weight were selected and divided into the control group,the 5％alfalfa addition group and the 10％alfalfa group,with 10 sheep in each group.The results showed that adding alfalfa hay to lamb starter diet increased the water holding capacity(P ＜ 0.05)and decreased bulk density(P ＜ 0.05).Adding alfalfa hay significantly reduced the average daily dry matter intake(P ＜ 0.05)of the lamb,and had no significant effect on weight,average daily gain and feed conversion ratio(P ＞ 0.05).The addition of Alfalfa hay in the diet reduced the concentration of beta hydroxybutyric acid in lambs,but had no adverse effect on the concentration of blood glucose and non-esterified fatty acids.Adding alfalfa hay in the diet increased the keratinization level of the stomach wall,increased the thickness of the muscular wall of the stomach wall,and had no adverse effect on other rumen morphological indexes.Therefore,the addition of alfalfa hay in lamb starter diet has no adverse effect on the growth performance of lamb,which can promote the early development of the rumen,and the amount of alfalfa can reach 10％.%本文旨在研究羔羊开食料中添加不同水平的苜蓿干草对羔羊断奶前后生长性能和瘤胃形态结构发育的影响.试验选择年龄、体重相近的30只萨寒杂交一代去势公羔羊,采用完全随机试验设计,分为对照组、5％苜蓿添加组、10％苜蓿添加组,每组10只羊,每只羊为一个重复.研究结果表明,羔羊开食料中添加苜蓿显著提高了开食料的系水力(P＜0.05),降低了容重(P＜0.05).羔羊开食料中添加苜蓿显著降低了羔羊的日均干物质采食量(P＜0.05),对体重、平均日增重和料肉比无显著影响(P＞0.05).开食料中添加苜蓿降低了羔羊血液β-羟丁酸浓度,但对血液葡萄糖和非酯化脂肪酸浓度无不利影响.开食料中添加苜蓿提高了羔羊瘤胃壁角质化程度,增加了瘤胃壁肌层厚度,对其他瘤胃形态指标无不利影响.因此,羔羊开食料中添加苜蓿干草对羔羊生长性能无不利影响,可以促进瘤胃提早发育,苜蓿的添加量可达10％.