Animal Nutrition Division, ICAR-Central Sheep and Wool Research Institute, Avikanagar, Rajasthan, India.
J Anim Physiol Anim Nutr (Berl). 2022 Mar;106(2):250-257. doi: 10.1111/jpn.13609. Epub 2021 Jul 21.
Pre-weaning nutrition has significant influence on post-weaning performance of lambs. Strategic weaning management on milk replacer allowance at this phase can be a promising approach for harvesting desired carcass trait in finisher phase. Therefore, present experiment aimed economizing pre-weaning weight gain in lambs by feeding milk replacer and subsequently minimizing weaning age. A study of 90 days duration was conducted to determine the production performance, nutrient utilization and rumen fermentation of lambs on milk replacer allowance at different weaning age. Sixty-six Malpura lambs (10 days of age) were randomly divided into 3 equal groups. Lambs in control group were allowed conventional free suckling of dam up to 90 day of age, whereas lambs in the two treatment groups, that is W60 and W90 were offered milk replacer and weaned at 60 and 90 days, respectively. Lambs in all groups were offered ad-libitum creep mixture, Ziziphus nummularia leaves, Vigna unguiculata hay and fresh Ailanthus excelsa leaves. Overall weight gain was 12.7 per cent higher (p < 0.05) in W90 than control whereas in W60 group it was statistically comparable with both control and W90 groups. Overall average daily gain was 12.1 per cent higher (p < 0.05) in W90 group as compared to control. In case of nutrient digestibility, there was significant depression of dry matter (DM), organic matter (OM), crude protein (CP) and neutral detergent fibre (NDF) by 16.9, 17.2, 9.3 and 32.0 per cent in W60 than control; however, in W90, CP digestibility was higher (p < 0.05) than control and W60. Considering economic analysis, the net return obtained from W90 (90 days weaning plus milk replacer allowance) was more 20.0 per cent higher than control. Therefore, it can be concluded that lamb rearing on milk replacer and weaning at 90 days have a sustained positive effect on lambs' production performance and is more profitable than the practice of milk replacer allowance and early weaning in semiarid conditions.
哺乳期营养对羔羊断奶后的表现有重大影响。在这一阶段，通过给予代乳料并随后最小化断奶年龄来进行战略性断奶管理，是一种在育肥期收获理想胴体特征的有前途的方法。因此，本实验旨在通过给予代乳料来节约羔羊哺乳期的体重增加，然后最小化断奶年龄。进行了为期 90 天的研究，以确定不同断奶年龄下羔羊的生产性能、养分利用率和瘤胃发酵情况。66 只马拉普尔羔羊（10 天大）被随机分为 3 组。对照组羔羊允许传统的自由吮吸母羊直至 90 天大，而在两个处理组，即 W60 和 W90 组，给予代乳料并在 60 和 90 天大时断奶。所有组的羔羊都自由采食刺槐叶、豇豆干草和新鲜臭椿叶。与对照组相比，W90 组的总增重高 12.7%（p<0.05），而 W60 组与对照组和 W90 组相比，统计上无显著差异。与对照组相比，W90 组的平均日增重高 12.1%（p<0.05）。在养分消化率方面，与对照组相比，W60 组的干物质（DM）、有机物（OM）、粗蛋白（CP）和中性洗涤纤维（NDF）分别显著降低了 16.9%、17.2%、9.3%和 32.0%；然而，在 W90 组中，CP 消化率高于对照组和 W60 组（p<0.05）。从经济分析的角度来看，从 W90（90 天断奶加上代乳料）获得的净利润比对照组高出 20.0%。因此，可以得出结论，在半干旱条件下，羔羊用代乳料饲养并在 90 天断奶对羔羊的生产性能有持续的积极影响，比代乳料和早期断奶的做法更有利可图。
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